0031395: Mesh - BRepMesh produces poor mesh on shape with hidden self-intersections

Add parameter UseVertexTolerance to curve tessellator;
Use UseVertexTolerance in case if model healer has failed 5 times at row;
Do not treat 2d loops that fit in 3d tolerance as OK cases.

CMakeLists.txt

@@ -10,6 +10,22 @@ set (CMAKE_CONFIGURATION_TYPES Release Debug RelWithDebInfo CACHE INTERNAL "" FO
 set (BUILD_CPP_STANDARD "C++11" CACHE STRING "Select using c++ standard.")
 set_property(CACHE BUILD_CPP_STANDARD PROPERTY STRINGS "C++11" "C++14" "C++17" "C++20" "C++23")
 
+# Set desired C++ standard
+if     ("${BUILD_CPP_STANDARD}" STREQUAL "C++11")
+  set (CMAKE_CXX_STANDARD 11)
+elseif ("${BUILD_CPP_STANDARD}" STREQUAL "C++14")
+  set (CMAKE_CXX_STANDARD 14)
+elseif ("${BUILD_CPP_STANDARD}" STREQUAL "C++17")
+  set (CMAKE_CXX_STANDARD 17)
+elseif ("${BUILD_CPP_STANDARD}" STREQUAL "C++20")
+  set (CMAKE_CXX_STANDARD 20)
+elseif ("${BUILD_CPP_STANDARD}" STREQUAL "C++23")
+  set (CMAKE_CXX_STANDARD 23)
+else ()
+  message (FATAL_ERROR, "misprint in c++ standard name")
+endif()
+set (CMAKE_CXX_STANDARD_REQUIRED ON)
+
 # macro: include patched file if it exists
 macro (OCCT_INCLUDE_CMAKE_FILE BEING_INCLUDED_FILE)
   if (BUILD_PATCH AND EXISTS "${BUILD_PATCH}/${BEING_INCLUDED_FILE}.cmake")
@@ -717,14 +733,14 @@ if (NOT DEFINED ANDROID AND CAN_USE_TBB)
     add_definitions (-DHAVE_TBB)
     OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/tbb")
   else()
-    OCCT_CHECK_AND_UNSET_GROUP ("3RDPARTY_TBB12")
+    OCCT_CHECK_AND_UNSET_GROUP ("3RDPARTY_TBB")
     OCCT_CHECK_AND_UNSET_GROUP ("3RDPARTY_TBBMALLOC")
     OCCT_CHECK_AND_UNSET ("INSTALL_TBB")
   endif()
 else()
   OCCT_CHECK_AND_UNSET ("USE_TBB")
 
-  OCCT_CHECK_AND_UNSET_GROUP ("3RDPARTY_TBB12")
+  OCCT_CHECK_AND_UNSET_GROUP ("3RDPARTY_TBB")
   OCCT_CHECK_AND_UNSET_GROUP ("3RDPARTY_TBBMALLOC")
   OCCT_CHECK_AND_UNSET ("INSTALL_TBB")
 endif()
@@ -804,6 +820,12 @@ else()
   OCCT_CHECK_AND_UNSET ("3RDPARTY_DOT_EXECUTABLE")
 endif()
 
+# ExpToCasExe
+if (EMSCRIPTEN)
+  list (REMOVE_ITEM BUILD_TOOLKITS TKExpress)
+  list (REMOVE_ITEM BUILD_TOOLKITS ExpToCasExe)
+endif()
+
 # bison
 if (BUILD_YACCLEX)
   OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/bison")

adm/MODULES

@@ -3,5 +3,5 @@ ModelingData TKG2d TKG3d TKGeomBase TKBRep
 ModelingAlgorithms TKGeomAlgo TKTopAlgo TKPrim TKBO TKBool TKHLR TKFillet TKOffset TKFeat TKMesh TKXMesh TKShHealing
 Visualization TKService TKV3d TKOpenGl TKOpenGles TKMeshVS TKIVtk TKD3DHost
 ApplicationFramework TKCDF TKLCAF TKCAF TKBinL TKXmlL TKBin TKXml TKStdL TKStd TKTObj TKBinTObj TKXmlTObj TKVCAF
-DataExchange TKXDE TKXSBase TKSTEPBase TKSTEPAttr TKSTEP209 TKSTEP TKIGES TKXCAF TKXDEIGES TKXDESTEP TKSTL TKVRML TKXmlXCAF TKBinXCAF TKRWMesh TKXDECascade
+DataExchange TKXDE TKXSBase TKSTEPBase TKSTEPAttr TKSTEP209 TKSTEP TKIGES TKXCAF TKXDEIGES TKXDESTEP TKSTL TKVRML TKXmlXCAF TKBinXCAF TKRWMesh TKXDECascade TKExpress ExpToCasExe
 Draw TKDraw TKTopTest TKOpenGlTest TKOpenGlesTest TKD3DHostTest TKViewerTest TKXSDRAW TKDCAF TKXDEDRAW TKTObjDRAW TKQADraw TKIVtkDraw DRAWEXE

adm/UDLIST

@@ -480,3 +480,6 @@ n TreeModel
 n View
 n ViewControl
 n VInspector
+n Express
+t TKExpress
+x ExpToCasExe

adm/cmake/bison.cmake

@@ -22,6 +22,4 @@ if (3RDPARTY_DIR)
   endforeach()
 endif()
  
-# bison 3.2 is required because it provides options to avoid generation of redundant header
-# files and embedding of local paths in the generated code
-find_package (BISON 3.2)
+find_package (BISON 3.7.4)

adm/cmake/cotire.cmake

@@ -3,7 +3,7 @@
 # See the cotire manual for usage hints.
 #
 #=============================================================================
-# Copyright 2012-2016 Sascha Kratky
+# Copyright 2012-2018 Sascha Kratky
 #
 # Permission is hereby granted, free of charge, to any person
 # obtaining a copy of this software and associated documentation
@@ -32,16 +32,18 @@ if(__COTIRE_INCLUDED)
 endif()
 set(__COTIRE_INCLUDED TRUE)
 
-# Caution! Be careful, when increase minimal cmake version:
-# using of newer version may leads (by default) to applying
-# of some new policies. It may break compilation.
-# For canceling of applying new policies use:
-# cmake_policy(PUSH) before `cmake_minimum_required`
-# and cmake_policy(POP) after.
-cmake_minimum_required(VERSION 3.1 FATAL_ERROR)
+# call cmake_minimum_required, but prevent modification of the CMake policy stack in include mode
+# cmake_minimum_required also sets the policy version as a side effect, which we have to avoid
+if (NOT CMAKE_SCRIPT_MODE_FILE)
+	cmake_policy(PUSH)
+endif()
+cmake_minimum_required(VERSION 2.8.12)
+if (NOT CMAKE_SCRIPT_MODE_FILE)
+	cmake_policy(POP)
+endif()
 
 set (COTIRE_CMAKE_MODULE_FILE "${CMAKE_CURRENT_LIST_FILE}")
-set (COTIRE_CMAKE_MODULE_VERSION "1.7.9")
+set (COTIRE_CMAKE_MODULE_VERSION "1.8.1")
 
 # activate select policies
 if (POLICY CMP0025)
@@ -104,6 +106,11 @@ if (POLICY CMP0054)
 	cmake_policy(SET CMP0054 NEW)
 endif()
 
+if (POLICY CMP0055)
+	# strict checking for break() command
+	cmake_policy(SET CMP0055 NEW)
+endif()
+
 include(CMakeParseArguments)
 include(ProcessorCount)
 
@@ -232,7 +239,13 @@ function (cotire_filter_language_source_files _language _target _sourceFilesVar
 				# add to excluded sources, if file has custom compile flags
 				list (APPEND _excludedSourceFiles "${_sourceFile}")
 			else()
-				list (APPEND _sourceFiles "${_sourceFile}")
+				get_source_file_property(_sourceCompileOptions "${_sourceFile}" COMPILE_OPTIONS)
+				if (_sourceCompileOptions)
+					# add to excluded sources, if file has list of custom compile options
+					list (APPEND _excludedSourceFiles "${_sourceFile}")
+				else()
+					list (APPEND _sourceFiles "${_sourceFile}")
+				endif()
 			endif()
 		endif()
 	endforeach()
@@ -291,7 +304,7 @@ function (cotire_get_source_file_property_values _valuesVar _property)
 	set (${_valuesVar} ${_values} PARENT_SCOPE)
 endfunction()
 
-function (cotire_resolve_config_properites _configurations _propertiesVar)
+function (cotire_resolve_config_properties _configurations _propertiesVar)
 	set (_properties "")
 	foreach (_property ${ARGN})
 		if ("${_property}" MATCHES "<CONFIG>")
@@ -307,8 +320,8 @@ function (cotire_resolve_config_properites _configurations _propertiesVar)
 	set (${_propertiesVar} ${_properties} PARENT_SCOPE)
 endfunction()
 
-function (cotire_copy_set_properites _configurations _type _source _target)
-	cotire_resolve_config_properites("${_configurations}" _properties ${ARGN})
+function (cotire_copy_set_properties _configurations _type _source _target)
+	cotire_resolve_config_properties("${_configurations}" _properties ${ARGN})
 	foreach (_property ${_properties})
 		get_property(_isSet ${_type} ${_source} PROPERTY ${_property} SET)
 		if (_isSet)
@@ -318,13 +331,18 @@ function (cotire_copy_set_properites _configurations _type _source _target)
 	endforeach()
 endfunction()
 
-function (cotire_get_target_usage_requirements _target _targetRequirementsVar)
+function (cotire_get_target_usage_requirements _target _config _targetRequirementsVar)
 	set (_targetRequirements "")
 	get_target_property(_librariesToProcess ${_target} LINK_LIBRARIES)
 	while (_librariesToProcess)
 		# remove from head
 		list (GET _librariesToProcess 0 _library)
 		list (REMOVE_AT _librariesToProcess 0)
+		if (_library MATCHES "^\\$<\\$<CONFIG:${_config}>:([A-Za-z0-9_:-]+)>$")
+			set (_library "${CMAKE_MATCH_1}")
+		elseif (_config STREQUAL "None" AND _library MATCHES "^\\$<\\$<CONFIG:>:([A-Za-z0-9_:-]+)>$")
+			set (_library "${CMAKE_MATCH_1}")
+		endif()
 		if (TARGET ${_library})
 			list (FIND _targetRequirements ${_library} _index)
 			if (_index LESS 0)
@@ -439,7 +457,7 @@ function (cotire_get_target_compile_flags _config _language _target _flagsVar)
 	# interface compile options from linked library targets
 	if (_target)
 		set (_linkedTargets "")
-		cotire_get_target_usage_requirements(${_target} _linkedTargets)
+		cotire_get_target_usage_requirements(${_target} ${_config} _linkedTargets)
 		foreach (_linkedTarget ${_linkedTargets})
 			get_target_property(_targetOptions ${_linkedTarget} INTERFACE_COMPILE_OPTIONS)
 			if (_targetOptions)
@@ -571,7 +589,7 @@ function (cotire_get_target_include_directories _config _language _target _inclu
 	# interface include directories from linked library targets
 	if (_target)
 		set (_linkedTargets "")
-		cotire_get_target_usage_requirements(${_target} _linkedTargets)
+		cotire_get_target_usage_requirements(${_target} ${_config} _linkedTargets)
 		foreach (_linkedTarget ${_linkedTargets})
 			get_target_property(_linkedTargetType ${_linkedTarget} TYPE)
 			if (CMAKE_INCLUDE_CURRENT_DIR_IN_INTERFACE AND NOT CMAKE_VERSION VERSION_LESS "3.4.0" AND
@@ -625,7 +643,7 @@ function (cotire_get_target_include_directories _config _language _target _inclu
 	if (CMAKE_${_language}_IMPLICIT_INCLUDE_DIRECTORIES)
 		list (REMOVE_ITEM _includeDirs ${CMAKE_${_language}_IMPLICIT_INCLUDE_DIRECTORIES})
 	endif()
-	if (WIN32)
+	if (WIN32 AND NOT MINGW)
 		# convert Windows paths in include directories to CMake paths
 		if (_includeDirs)
 			set (_paths "")
@@ -701,7 +719,7 @@ function (cotire_get_target_compile_definitions _config _language _target _defin
 	endif()
 	# interface compile definitions from linked library targets
 	set (_linkedTargets "")
-	cotire_get_target_usage_requirements(${_target} _linkedTargets)
+	cotire_get_target_usage_requirements(${_target} ${_config} _linkedTargets)
 	foreach (_linkedTarget ${_linkedTargets})
 		get_target_property(_definitions ${_linkedTarget} INTERFACE_COMPILE_DEFINITIONS)
 		if (_definitions)
@@ -709,7 +727,7 @@ function (cotire_get_target_compile_definitions _config _language _target _defin
 		endif()
 	endforeach()
 	# parse additional compile definitions from target compile flags
-	# and don't look at directory compile definitions, which we already handled
+	# and do not look at directory compile definitions, which we already handled
 	set (_targetFlags "")
 	cotire_get_target_compile_flags("${_config}" "${_language}" "${_target}" _targetFlags)
 	cotire_filter_compile_flags("${_language}" "D" _definitions _ignore ${_targetFlags})
@@ -857,6 +875,9 @@ macro (cotire_set_cmd_to_prologue _cmdVar)
 		list (APPEND ${_cmdVar} "--warn-uninitialized")
 	endif()
 	list (APPEND ${_cmdVar} "-DCOTIRE_BUILD_TYPE:STRING=$<CONFIGURATION>")
+	if (XCODE)
+		list (APPEND ${_cmdVar} "-DXCODE:BOOL=TRUE")
+	endif()
 	if (COTIRE_VERBOSE)
 		list (APPEND ${_cmdVar} "-DCOTIRE_VERBOSE:BOOL=ON")
 	elseif("${CMAKE_GENERATOR}" MATCHES "Makefiles")
@@ -874,6 +895,9 @@ function (cotire_init_compile_cmd _cmdVar _language _compilerLauncher _compilerE
 	if (NOT _compilerArg1)
 		set (_compilerArg1 ${CMAKE_${_language}_COMPILER_ARG1})
 	endif()
+	if (WIN32)
+		file (TO_NATIVE_PATH "${_compilerExe}" _compilerExe)
+	endif()
 	string (STRIP "${_compilerArg1}" _compilerArg1)
 	if ("${CMAKE_GENERATOR}" MATCHES "Make|Ninja")
 		# compiler launcher is only supported for Makefile and Ninja
@@ -900,16 +924,16 @@ function (cotire_add_includes_to_cmd _cmdVar _language _includesVar _systemInclu
 		foreach (_include ${_includeDirs})
 			if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
 				file (TO_NATIVE_PATH "${_include}" _include)
-				list (APPEND ${_cmdVar} "${CMAKE_INCLUDE_FLAG_${_language}}${CMAKE_INCLUDE_FLAG_${_language}_SEP}${_include}")
+				list (APPEND ${_cmdVar} "${CMAKE_INCLUDE_FLAG_${_language}}${CMAKE_INCLUDE_FLAG_SEP_${_language}}${_include}")
 			else()
 				set (_index -1)
 				if ("${CMAKE_INCLUDE_SYSTEM_FLAG_${_language}}" MATCHES ".+")
 					list (FIND ${_systemIncludesVar} "${_include}" _index)
 				endif()
 				if (_index GREATER -1)
-					list (APPEND ${_cmdVar} "${CMAKE_INCLUDE_SYSTEM_FLAG_${_language}}${_include}")
+					list (APPEND ${_cmdVar} "${CMAKE_INCLUDE_SYSTEM_FLAG_${_language}}${CMAKE_INCLUDE_FLAG_SEP_${_language}}${_include}")
 				else()
-					list (APPEND ${_cmdVar} "${CMAKE_INCLUDE_FLAG_${_language}}${CMAKE_INCLUDE_FLAG_${_language}_SEP}${_include}")
+					list (APPEND ${_cmdVar} "${CMAKE_INCLUDE_FLAG_${_language}}${CMAKE_INCLUDE_FLAG_SEP_${_language}}${_include}")
 				endif()
 			endif()
 		endforeach()
@@ -1044,10 +1068,10 @@ macro (cotire_check_ignore_header_file_path _headerFile _headerIsIgnoredVar)
 		set (${_headerIsIgnoredVar} TRUE)
 	elseif (IS_DIRECTORY "${_headerFile}")
 		set (${_headerIsIgnoredVar} TRUE)
-	elseif ("${_headerFile}" MATCHES "\\.\\.|[_-]fixed" AND "${_headerFile}" MATCHES "\\.h$")
-		# heuristic: ignore C headers with embedded parent directory references or "-fixed" or "_fixed" in path
+	elseif ("${_headerFile}" MATCHES "\\.\\.|[_-]fixed")
+		# heuristic: ignore headers with embedded parent directory references or "-fixed" or "_fixed" in path
 		# these often stem from using GCC #include_next tricks, which may break the precompiled header compilation
-		# with the error message "error: no include path in which to search for header.h"
+		# with the error message "error: no include path in which to search for header"
 		set (${_headerIsIgnoredVar} TRUE)
 	else()
 		set (${_headerIsIgnoredVar} FALSE)
@@ -1068,12 +1092,11 @@ endmacro()
 
 macro (cotire_parse_line _line _headerFileVar _headerDepthVar)
 	if (MSVC)
-		# cl.exe /showIncludes output looks different depending on the language pack used, e.g.:
+		# cl.exe /showIncludes produces different output, depending on the language pack used, e.g.:
 		# English: "Note: including file:   C:\directory\file"
 		# German: "Hinweis: Einlesen der Datei:   C:\directory\file"
 		# We use a very general regular expression, relying on the presence of the : characters
 		if (_line MATCHES "( +)([a-zA-Z]:[^:]+)$")
-			# Visual Studio compiler output
 			string (LENGTH "${CMAKE_MATCH_1}" ${_headerDepthVar})
 			get_filename_component(${_headerFileVar} "${CMAKE_MATCH_2}" ABSOLUTE)
 		else()
@@ -1231,11 +1254,19 @@ function (cotire_scan_includes _includesVar)
 		set (${_includesVar} "" PARENT_SCOPE)
 		return()
 	endif()
-	list (APPEND _cmd ${_existingSourceFiles})
+	# add source files to be scanned
+	if (WIN32)
+		foreach (_sourceFile ${_existingSourceFiles})
+			file (TO_NATIVE_PATH "${_sourceFile}" _sourceFileNative)
+			list (APPEND _cmd "${_sourceFileNative}")
+		endforeach()
+	else()
+		list (APPEND _cmd ${_existingSourceFiles})
+	endif()
 	if (COTIRE_VERBOSE)
 		message (STATUS "execute_process: ${_cmd}")
 	endif()
-	if (_option_COMPILER_ID MATCHES "MSVC")
+	if (MSVC_IDE OR _option_COMPILER_ID MATCHES "MSVC")
 		# cl.exe messes with the output streams unless the environment variable VS_UNICODE_OUTPUT is cleared
 		unset (ENV{VS_UNICODE_OUTPUT})
 	endif()
@@ -1471,11 +1502,16 @@ function (cotire_generate_prefix_header _prefixFile)
 	if (_unparsedLines)
 		if (COTIRE_VERBOSE OR _scanResult OR NOT _selectedHeaders)
 			list (LENGTH _unparsedLines _skippedLineCount)
-			message (STATUS "${_skippedLineCount} line(s) skipped, see ${_unparsedLinesFile}")
+			if (WIN32)
+				file (TO_NATIVE_PATH "${_unparsedLinesFile}" _unparsedLinesLogPath)
+			else()
+				set (_unparsedLinesLogPath "${_unparsedLinesFile}")
+			endif()
+			message (STATUS "${_skippedLineCount} line(s) skipped, see ${_unparsedLinesLogPath}")
 		endif()
 		string (REPLACE ";" "\n" _unparsedLines "${_unparsedLines}")
 	endif()
-	file (WRITE "${_unparsedLinesFile}" "${_unparsedLines}")
+	file (WRITE "${_unparsedLinesFile}" "${_unparsedLines}\n")
 endfunction()
 
 function (cotire_add_makedep_flags _language _compilerID _compilerVersion _flagsVar)
@@ -1505,7 +1541,7 @@ function (cotire_add_makedep_flags _language _compilerID _compilerVersion _flags
 			# append to list
 			list (APPEND _flags -H -E)
 			if (NOT "${_compilerVersion}" VERSION_LESS "4.3.0")
-				list (APPEND _flags "-fdirectives-only")
+				list (APPEND _flags -fdirectives-only)
 			endif()
 		else()
 			# return as a flag string
@@ -1515,16 +1551,36 @@ function (cotire_add_makedep_flags _language _compilerID _compilerVersion _flags
 			endif()
 		endif()
 	elseif (_compilerID MATCHES "Clang")
-		# Clang options used
-		# -H print the name of each header file used
-		# -E invoke preprocessor
-		# -fno-color-diagnostics don't prints diagnostics in color
-		if (_flags)
-			# append to list
-			list (APPEND _flags -H -E -fno-color-diagnostics)
-		else()
-			# return as a flag string
-			set (_flags "-H -E -fno-color-diagnostics")
+		if (UNIX)
+			# Clang options used
+			# -H print the name of each header file used
+			# -E invoke preprocessor
+			# -fno-color-diagnostics do not print diagnostics in color
+			# -Eonly just run preprocessor, no output
+			if (_flags)
+				# append to list
+				list (APPEND _flags -H -E -fno-color-diagnostics -Xclang -Eonly)
+			else()
+				# return as a flag string
+				set (_flags "-H -E -fno-color-diagnostics -Xclang -Eonly")
+			endif()
+		elseif (WIN32)
+			# Clang-cl.exe options used
+			# /TC treat all files named on the command line as C source files
+			# /TP treat all files named on the command line as C++ source files
+			# /EP preprocess to stdout without #line directives
+			# -H print the name of each header file used
+			# -fno-color-diagnostics do not print diagnostics in color
+			# -Eonly just run preprocessor, no output
+			set (_sourceFileTypeC "/TC")
+			set (_sourceFileTypeCXX "/TP")
+			if (_flags)
+				# append to list
+				list (APPEND _flags "${_sourceFileType${_language}}" /EP -fno-color-diagnostics -Xclang -H -Xclang -Eonly)
+			else()
+				# return as a flag string
+				set (_flags "${_sourceFileType${_language}} /EP -fno-color-diagnostics -Xclang -H -Xclang -Eonly")
+			endif()
 		endif()
 	elseif (_compilerID MATCHES "Intel")
 		if (WIN32)
@@ -1598,8 +1654,8 @@ function (cotire_add_pch_compilation_flags _language _compilerID _compilerVersio
 				set (_flags "${_flags} /Zm${COTIRE_PCH_MEMORY_SCALING_FACTOR}")
 			endif()
 		endif()
-	elseif (_compilerID MATCHES "GNU|Clang")
-		# GCC / Clang options used
+	elseif (_compilerID MATCHES "GNU")
+		# GCC options used
 		# -x specify the source language
 		# -c compile but do not link
 		# -o place output in file
@@ -1609,11 +1665,55 @@ function (cotire_add_pch_compilation_flags _language _compilerID _compilerVersio
 		set (_xLanguage_CXX "c++-header")
 		if (_flags)
 			# append to list
-			list (APPEND _flags "-x" "${_xLanguage_${_language}}" "-c" "${_prefixFile}" -o "${_pchFile}")
+			list (APPEND _flags -x "${_xLanguage_${_language}}" -c "${_prefixFile}" -o "${_pchFile}")
 		else()
 			# return as a flag string
 			set (_flags "-x ${_xLanguage_${_language}} -c \"${_prefixFile}\" -o \"${_pchFile}\"")
 		endif()
+	elseif (_compilerID MATCHES "Clang")
+		if (UNIX)
+			# Clang options used
+			# -x specify the source language
+			# -c compile but do not link
+			# -o place output in file
+			# -fno-pch-timestamp disable inclusion of timestamp in precompiled headers (clang 4.0.0+)
+			set (_xLanguage_C "c-header")
+			set (_xLanguage_CXX "c++-header")
+			if (_flags)
+				# append to list
+				list (APPEND _flags -x "${_xLanguage_${_language}}" -c "${_prefixFile}" -o "${_pchFile}")
+				if (NOT "${_compilerVersion}" VERSION_LESS "4.0.0")
+					list (APPEND _flags -Xclang -fno-pch-timestamp)
+				endif()
+			else()
+				# return as a flag string
+				set (_flags "-x ${_xLanguage_${_language}} -c \"${_prefixFile}\" -o \"${_pchFile}\"")
+				if (NOT "${_compilerVersion}" VERSION_LESS "4.0.0")
+					set (_flags "${_flags} -Xclang -fno-pch-timestamp")
+				endif()
+			endif()
+		elseif (WIN32)
+			file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+			file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+			file (TO_NATIVE_PATH "${_hostFile}" _hostFileNative)
+			# Clang-cl.exe options used
+			# /Yc creates a precompiled header file
+			# /Fp specifies precompiled header binary file name
+			# /FI forces inclusion of file
+			# /Zs syntax check only
+			# /TC treat all files named on the command line as C source files
+			# /TP treat all files named on the command line as C++ source files
+			set (_sourceFileTypeC "/TC")
+			set (_sourceFileTypeCXX "/TP")
+			if (_flags)
+				# append to list
+				list (APPEND _flags "${_sourceFileType${_language}}"
+						"/Yc${_prefixFileNative}" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}" /Zs "${_hostFileNative}")
+			else()
+				# return as a flag string
+				set (_flags "/Yc\"${_prefixFileNative}\" /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
+			endif()
+		endif()
 	elseif (_compilerID MATCHES "Intel")
 		if (WIN32)
 			file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
@@ -1655,20 +1755,28 @@ function (cotire_add_pch_compilation_flags _language _compilerID _compilerVersio
 			get_filename_component(_pchName "${_pchFile}" NAME)
 			set (_xLanguage_C "c-header")
 			set (_xLanguage_CXX "c++-header")
+			set (_pchSuppressMessages FALSE)
+			if ("${CMAKE_${_language}_FLAGS}" MATCHES ".*-Wno-pch-messages.*")
+				set(_pchSuppressMessages TRUE)
+			endif()
 			if (_flags)
 				# append to list
 				if ("${_language}" STREQUAL "CXX")
 					list (APPEND _flags -Kc++)
 				endif()
-				list (APPEND _flags "-include" "${_prefixFile}" "-pch-dir" "${_pchDir}" "-pch-create" "${_pchName}" "-fsyntax-only" "${_hostFile}")
+				list (APPEND _flags -include "${_prefixFile}" -pch-dir "${_pchDir}" -pch-create "${_pchName}" -fsyntax-only "${_hostFile}")
 				if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
-					list (APPEND _flags "-Wpch-messages")
+					if (NOT _pchSuppressMessages)
+						list (APPEND _flags -Wpch-messages)
+					endif()
 				endif()
 			else()
 				# return as a flag string
 				set (_flags "-include \"${_prefixFile}\" -pch-dir \"${_pchDir}\" -pch-create \"${_pchName}\"")
 				if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
-					set (_flags "${_flags} -Wpch-messages")
+					if (NOT _pchSuppressMessages)
+						set (_flags "${_flags} -Wpch-messages")
+					endif()
 				endif()
 			endif()
 		endif()
@@ -1719,23 +1827,48 @@ function (cotire_add_prefix_pch_inclusion_flags _language _compilerID _compilerV
 		# note: ccache requires the -include flag to be used in order to process precompiled header correctly
 		if (_flags)
 			# append to list
-			list (APPEND _flags "-Winvalid-pch" "-include" "${_prefixFile}")
+			list (APPEND _flags -Winvalid-pch -include "${_prefixFile}")
 		else()
 			# return as a flag string
 			set (_flags "-Winvalid-pch -include \"${_prefixFile}\"")
 		endif()
 	elseif (_compilerID MATCHES "Clang")
-		# Clang options used
-		# -include process include file as the first line of the primary source file
-		# -include-pch include precompiled header file
-		# -Qunused-arguments don't emit warning for unused driver arguments
-		# note: ccache requires the -include flag to be used in order to process precompiled header correctly
-		if (_flags)
-			# append to list
-			list (APPEND _flags "-Qunused-arguments" "-include" "${_prefixFile}")
-		else()
-			# return as a flag string
-			set (_flags "-Qunused-arguments -include \"${_prefixFile}\"")
+		if (UNIX)
+			# Clang options used
+			# -include process include file as the first line of the primary source file
+			# note: ccache requires the -include flag to be used in order to process precompiled header correctly
+			if (_flags)
+				# append to list
+				list (APPEND _flags -include "${_prefixFile}")
+			else()
+				# return as a flag string
+				set (_flags "-include \"${_prefixFile}\"")
+			endif()
+		elseif (WIN32)
+			file (TO_NATIVE_PATH "${_prefixFile}" _prefixFileNative)
+			# Clang-cl.exe options used
+			# /Yu uses a precompiled header file during build
+			# /Fp specifies precompiled header binary file name
+			# /FI forces inclusion of file
+			if (_pchFile)
+				file (TO_NATIVE_PATH "${_pchFile}" _pchFileNative)
+				if (_flags)
+					# append to list
+					list (APPEND _flags "/Yu${_prefixFileNative}" "/Fp${_pchFileNative}" "/FI${_prefixFileNative}")
+				else()
+					# return as a flag string
+					set (_flags "/Yu\"${_prefixFileNative}\" /Fp\"${_pchFileNative}\" /FI\"${_prefixFileNative}\"")
+				endif()
+			else()
+				# no precompiled header, force inclusion of prefix header
+				if (_flags)
+					# append to list
+					list (APPEND _flags "/FI${_prefixFileNative}")
+				else()
+					# return as a flag string
+					set (_flags "/FI\"${_prefixFileNative}\"")
+				endif()
+			endif()
 		endif()
 	elseif (_compilerID MATCHES "Intel")
 		if (WIN32)
@@ -1779,24 +1912,32 @@ function (cotire_add_prefix_pch_inclusion_flags _language _compilerID _compilerV
 			if (_pchFile)
 				get_filename_component(_pchDir "${_pchFile}" DIRECTORY)
 				get_filename_component(_pchName "${_pchFile}" NAME)
+				set (_pchSuppressMessages FALSE)
+				if ("${CMAKE_${_language}_FLAGS}" MATCHES ".*-Wno-pch-messages.*")
+					set(_pchSuppressMessages TRUE)
+				endif()
 				if (_flags)
 					# append to list
-					list (APPEND _flags "-include" "${_prefixFile}" "-pch-dir" "${_pchDir}" "-pch-use" "${_pchName}")
+					list (APPEND _flags -include "${_prefixFile}" -pch-dir "${_pchDir}" -pch-use "${_pchName}")
 					if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
-						list (APPEND _flags "-Wpch-messages")
+						if (NOT _pchSuppressMessages)
+							list (APPEND _flags -Wpch-messages)
+						endif()
 					endif()
 				else()
 					# return as a flag string
 					set (_flags "-include \"${_prefixFile}\" -pch-dir \"${_pchDir}\" -pch-use \"${_pchName}\"")
 					if (NOT "${_compilerVersion}" VERSION_LESS "13.1.0")
-						set (_flags "${_flags} -Wpch-messages")
+						if (NOT _pchSuppressMessages)
+							set (_flags "${_flags} -Wpch-messages")
+						endif()
 					endif()
 				endif()
 			else()
 				# no precompiled header, force inclusion of prefix header
 				if (_flags)
 					# append to list
-					list (APPEND _flags "-include" "${_prefixFile}")
+					list (APPEND _flags -include "${_prefixFile}")
 				else()
 					# return as a flag string
 					set (_flags "-include \"${_prefixFile}\"")
@@ -1834,9 +1975,17 @@ function (cotire_precompile_prefix_header _prefixFile _pchFile _hostFile)
 	if (COTIRE_VERBOSE)
 		message (STATUS "execute_process: ${_cmd}")
 	endif()
-	if (_option_COMPILER_ID MATCHES "MSVC")
+	if (MSVC_IDE OR _option_COMPILER_ID MATCHES "MSVC")
 		# cl.exe messes with the output streams unless the environment variable VS_UNICODE_OUTPUT is cleared
 		unset (ENV{VS_UNICODE_OUTPUT})
+	elseif (_option_COMPILER_ID MATCHES "Clang" AND _option_COMPILER_VERSION VERSION_LESS "4.0.0")
+		if (_option_COMPILER_LAUNCHER MATCHES "ccache" OR
+			_option_COMPILER_EXECUTABLE MATCHES "ccache")
+			# Newer versions of Clang embed a compilation timestamp into the precompiled header binary,
+			# which results in "file has been modified since the precompiled header was built" errors if ccache is used.
+			# We work around the problem by disabling ccache upon pre-compiling the prefix header.
+			set (ENV{CCACHE_DISABLE} "true")
+		endif()
 	endif()
 	execute_process(
 		COMMAND ${_cmd}
@@ -1851,7 +2000,7 @@ function (cotire_check_precompiled_header_support _language _target _msgVar)
 	set (_unsupportedCompiler
 		"Precompiled headers not supported for ${_language} compiler ${CMAKE_${_language}_COMPILER_ID}")
 	if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC")
-		# supported since Visual Studio C++ 6.0
+		# PCH supported since Visual Studio C++ 6.0
 		# and CMake does not support an earlier version
 		set (${_msgVar} "" PARENT_SCOPE)
 	elseif (CMAKE_${_language}_COMPILER_ID MATCHES "GNU")
@@ -1862,8 +2011,16 @@ function (cotire_check_precompiled_header_support _language _target _msgVar)
 			set (${_msgVar} "" PARENT_SCOPE)
 		endif()
 	elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Clang")
-		# all Clang versions have PCH support
-		set (${_msgVar} "" PARENT_SCOPE)
+		if (UNIX)
+			# all Unix Clang versions have PCH support
+			set (${_msgVar} "" PARENT_SCOPE)
+		elseif (WIN32)
+			# only clang-cl is supported under Windows
+			get_filename_component(_compilerName "${CMAKE_${_language}_COMPILER}" NAME_WE)
+			if (NOT _compilerName MATCHES "cl$")
+				set (${_msgVar} "${_unsupportedCompiler} version ${CMAKE_${_language}_COMPILER_VERSION}. Use clang-cl instead." PARENT_SCOPE)
+			endif()
+		endif()
 	elseif (CMAKE_${_language}_COMPILER_ID MATCHES "Intel")
 		# Intel PCH support requires version >= 8.0.0
 		if ("${CMAKE_${_language}_COMPILER_VERSION}" VERSION_LESS "8.0.0")
@@ -1874,29 +2031,38 @@ function (cotire_check_precompiled_header_support _language _target _msgVar)
 	else()
 		set (${_msgVar} "${_unsupportedCompiler}." PARENT_SCOPE)
 	endif()
+	# check if ccache is used as a compiler launcher
 	get_target_property(_launcher ${_target} ${_language}_COMPILER_LAUNCHER)
-	if (CMAKE_${_language}_COMPILER MATCHES "ccache" OR _launcher MATCHES "ccache")
+	get_filename_component(_realCompilerExe "${CMAKE_${_language}_COMPILER}" REALPATH)
+	if (_realCompilerExe MATCHES "ccache" OR _launcher MATCHES "ccache")
+		# verify that ccache configuration is compatible with precompiled headers
+		# always check environment variable CCACHE_SLOPPINESS, because earlier versions of ccache
+		# do not report the "sloppiness" setting correctly upon printing ccache configuration
 		if (DEFINED ENV{CCACHE_SLOPPINESS})
-			if (NOT "$ENV{CCACHE_SLOPPINESS}" MATCHES "pch_defines" OR NOT "$ENV{CCACHE_SLOPPINESS}" MATCHES "time_macros")
+			if (NOT "$ENV{CCACHE_SLOPPINESS}" MATCHES "pch_defines" OR
+				NOT "$ENV{CCACHE_SLOPPINESS}" MATCHES "time_macros")
 				set (${_msgVar}
 					"ccache requires the environment variable CCACHE_SLOPPINESS to be set to \"pch_defines,time_macros\"."
 					PARENT_SCOPE)
 			endif()
 		else()
-			if (_launcher MATCHES "ccache")
-				get_filename_component(_ccacheExe "${_launcher}" REALPATH)
+			if (_realCompilerExe MATCHES "ccache")
+				set (_ccacheExe "${_realCompilerExe}")
 			else()
-				get_filename_component(_ccacheExe "${CMAKE_${_language}_COMPILER}" REALPATH)
+				set (_ccacheExe "${_launcher}")
 			endif()
+			# ccache 3.7.0 replaced --print-config with --show-config
+			# use -p instead, which seems to work for all version for now, sigh
 			execute_process(
-				COMMAND "${_ccacheExe}" "--print-config"
+				COMMAND "${_ccacheExe}" "-p"
 				WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
 				RESULT_VARIABLE _result
 				OUTPUT_VARIABLE _ccacheConfig OUTPUT_STRIP_TRAILING_WHITESPACE
 				ERROR_QUIET)
-			if (_result OR NOT
-				_ccacheConfig MATCHES "sloppiness.*=.*time_macros" OR NOT
-				_ccacheConfig MATCHES "sloppiness.*=.*pch_defines")
+			if (_result)
+				set (${_msgVar} "ccache configuration cannot be determined." PARENT_SCOPE)
+			elseif (NOT _ccacheConfig MATCHES "sloppiness.*=.*time_macros" OR
+				NOT _ccacheConfig MATCHES "sloppiness.*=.*pch_defines")
 				set (${_msgVar}
 					"ccache requires configuration setting \"sloppiness\" to be set to \"pch_defines,time_macros\"."
 					PARENT_SCOPE)
@@ -2189,7 +2355,7 @@ function (cotire_generate_target_script _language _configurations _target _targe
 		XCODE MSVC CMAKE_GENERATOR CMAKE_BUILD_TYPE CMAKE_CONFIGURATION_TYPES
 		CMAKE_${_language}_COMPILER_ID CMAKE_${_language}_COMPILER_VERSION
 		CMAKE_${_language}_COMPILER_LAUNCHER CMAKE_${_language}_COMPILER CMAKE_${_language}_COMPILER_ARG1
-		CMAKE_INCLUDE_FLAG_${_language} CMAKE_INCLUDE_FLAG_${_language}_SEP
+		CMAKE_INCLUDE_FLAG_${_language} CMAKE_INCLUDE_FLAG_SEP_${_language}
 		CMAKE_INCLUDE_SYSTEM_FLAG_${_language}
 		CMAKE_${_language}_FRAMEWORK_SEARCH_FLAG
 		CMAKE_${_language}_SYSTEM_FRAMEWORK_SEARCH_FLAG
@@ -2222,8 +2388,9 @@ endfunction()
 
 function (cotire_setup_pch_file_compilation _language _target _targetScript _prefixFile _pchFile _hostFile)
 	set (_sourceFiles ${ARGN})
-	if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
-		# for Visual Studio and Intel, we attach the precompiled header compilation to the host file
+	if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel" OR
+		(WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "Clang"))
+		# for MSVC, Intel and Clang-cl, we attach the precompiled header compilation to the host file
 		# the remaining files include the precompiled header, see cotire_setup_pch_file_inclusion
 		if (_sourceFiles)
 			set (_flags "")
@@ -2231,6 +2398,9 @@ function (cotire_setup_pch_file_compilation _language _target _targetScript _pre
 				"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
 				"${_prefixFile}" "${_pchFile}" "${_hostFile}" _flags)
 			set_property (SOURCE ${_hostFile} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+			if (COTIRE_DEBUG)
+				message (STATUS "set_property: SOURCE ${_hostFile} APPEND_STRING COMPILE_FLAGS ${_flags}")
+			endif()
 			set_property (SOURCE ${_hostFile} APPEND PROPERTY OBJECT_OUTPUTS "${_pchFile}")
 			# make object file generated from host file depend on prefix header
 			set_property (SOURCE ${_hostFile} APPEND PROPERTY OBJECT_DEPENDS "${_prefixFile}")
@@ -2268,8 +2438,9 @@ function (cotire_setup_pch_file_compilation _language _target _targetScript _pre
 endfunction()
 
 function (cotire_setup_pch_file_inclusion _language _target _wholeTarget _prefixFile _pchFile _hostFile)
-	if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
-		# for Visual Studio and Intel, we include the precompiled header in all but the host file
+	if (CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel" OR
+		(WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "Clang"))
+		# for MSVC, Intel and clang-cl, we include the precompiled header in all but the host file
 		# the host file does the precompiled header compilation, see cotire_setup_pch_file_compilation
 		set (_sourceFiles ${ARGN})
 		list (LENGTH _sourceFiles _numberOfSourceFiles)
@@ -2281,6 +2452,9 @@ function (cotire_setup_pch_file_inclusion _language _target _wholeTarget _prefix
 				"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
 				"${_prefixFile}" "${_pchFile}" _flags)
 			set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+			if (COTIRE_DEBUG)
+				message (STATUS "set_property: SOURCE ${_sourceFiles} APPEND_STRING COMPILE_FLAGS ${_flags}")
+			endif()
 			# make object files generated from source files depend on precompiled header
 			set_property (SOURCE ${_sourceFiles} APPEND PROPERTY OBJECT_DEPENDS "${_pchFile}")
 		endif()
@@ -2294,6 +2468,9 @@ function (cotire_setup_pch_file_inclusion _language _target _wholeTarget _prefix
 				"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
 				"${_prefixFile}" "${_pchFile}" _flags)
 			set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+			if (COTIRE_DEBUG)
+				message (STATUS "set_property: SOURCE ${_sourceFiles} APPEND_STRING COMPILE_FLAGS ${_flags}")
+			endif()
 			# mark sources as cotired to prevent them from being used in another cotired target
 			set_source_files_properties(${_sourceFiles} PROPERTIES COTIRE_TARGET "${_target}")
 		endif()
@@ -2311,6 +2488,9 @@ function (cotire_setup_prefix_file_inclusion _language _target _prefixFile)
 		"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
 		"${_prefixFile}" "${_pchFile}" _flags)
 	set_property (SOURCE ${_sourceFiles} APPEND_STRING PROPERTY COMPILE_FLAGS " ${_flags} ")
+	if (COTIRE_DEBUG)
+		message (STATUS "set_property: SOURCE ${_sourceFiles} APPEND_STRING COMPILE_FLAGS ${_flags}")
+	endif()
 	# mark sources as cotired to prevent them from being used in another cotired target
 	set_source_files_properties(${_sourceFiles} PROPERTIES COTIRE_TARGET "${_target}")
 	# make object files generated from source files depend on prefix header
@@ -2400,7 +2580,7 @@ function (cotire_setup_target_pch_usage _languages _target _wholeTarget)
 			message (STATUS "add_custom_command: TARGET ${_target} PRE_BUILD ${_cmds}")
 		endif()
 		# because CMake PRE_BUILD command does not support dependencies,
-		# we check dependencies explicitly in cotire script mode when the pre-build action is run
+		# we check dependencies explicity in cotire script mode when the pre-build action is run
 		add_custom_command(
 			TARGET "${_target}"
 			PRE_BUILD ${_cmds}
@@ -2415,9 +2595,10 @@ function (cotire_setup_target_pch_usage _languages _target _wholeTarget)
 		# if this is a single-language target without any excluded files
 		if (_wholeTarget)
 			set (_language "${_languages}")
-			# for Visual Studio and Intel, precompiled header inclusion is always done on the source file level
+			# for MSVC, Intel and clang-cl, precompiled header inclusion is always done on the source file level
 			# see cotire_setup_pch_file_inclusion
-			if (NOT CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
+			if (NOT CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel" AND NOT
+				(WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "Clang"))
 				get_property(_prefixFile TARGET ${_target} PROPERTY COTIRE_${_language}_PREFIX_HEADER)
 				if (_prefixFile)
 					get_property(_pchFile TARGET ${_target} PROPERTY COTIRE_${_language}_PRECOMPILED_HEADER)
@@ -2426,6 +2607,9 @@ function (cotire_setup_target_pch_usage _languages _target _wholeTarget)
 						"${_language}" "${CMAKE_${_language}_COMPILER_ID}" "${CMAKE_${_language}_COMPILER_VERSION}"
 						"${_prefixFile}" "${_pchFile}" _options)
 					set_property(TARGET ${_target} APPEND PROPERTY ${_options})
+					if (COTIRE_DEBUG)
+						message (STATUS "set_property: TARGET ${_target} APPEND PROPERTY ${_options}")
+					endif()
 				endif()
 			endif()
 		endif()
@@ -2452,7 +2636,8 @@ function (cotire_setup_unity_generation_commands _language _target _targetScript
 			set_property (SOURCE "${_unityFile}" PROPERTY OBJECT_DEPENDS ${_objectDependsPaths})
 		endif()
 		if (WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
-			# unity file compilation results in potentially huge object file, thus use /bigobj by default unter MSVC and Windows Intel
+			# unity file compilation results in potentially huge object file,
+			# thus use /bigobj by default unter cl.exe and Windows Intel
 			set_property (SOURCE "${_unityFile}" APPEND_STRING PROPERTY COMPILE_FLAGS "/bigobj")
 		endif()
 		cotire_set_cmd_to_prologue(_unityCmd)
@@ -2658,6 +2843,9 @@ function (cotire_make_target_message _target _languages _disableMsg _targetMsgVa
 		else()
 			set (_targetMsg "${_languagesStr} target ${_target} cotired without unity build.")
 		endif()
+		if (_disableMsg)
+			set (_targetMsg "${_targetMsg} ${_disableMsg}")
+		endif()
 	else()
 		if (_excludedStr)
 			set (_targetMsg "${_languagesStr} target ${_target} cotired ${_excludedStr}.")
@@ -2747,6 +2935,20 @@ function (cotire_choose_target_languages _target _targetLanguagesVar _wholeTarge
 			set (_targetUsePCH FALSE)
 		endif()
 	endif()
+	if (_targetAddSCU)
+		# disable unity builds if automatic Qt processing is used
+		get_target_property(_targetAutoMoc ${_target} AUTOMOC)
+		get_target_property(_targetAutoUic ${_target} AUTOUIC)
+		get_target_property(_targetAutoRcc ${_target} AUTORCC)
+		if (_targetAutoMoc OR _targetAutoUic OR _targetAutoRcc)
+			if (_disableMsg)
+				set (_disableMsg "${_disableMsg} Target uses automatic CMake Qt processing.")
+			else()
+				set (_disableMsg "Target uses automatic CMake Qt processing.")
+			endif()
+			set (_targetAddSCU FALSE)
+		endif()
+	endif()
 	set_property(TARGET ${_target} PROPERTY COTIRE_ENABLE_PRECOMPILED_HEADER ${_targetUsePCH})
 	set_property(TARGET ${_target} PROPERTY COTIRE_ADD_UNITY_BUILD ${_targetAddSCU})
 	cotire_make_target_message(${_target} "${_targetLanguages}" "${_disableMsg}" _targetMsg ${_allExcludedSourceFiles})
@@ -2774,7 +2976,11 @@ function (cotire_compute_unity_max_number_of_includes _target _maxIncludesVar)
 	set (_sourceFiles ${ARGN})
 	get_target_property(_maxIncludes ${_target} COTIRE_UNITY_SOURCE_MAXIMUM_NUMBER_OF_INCLUDES)
 	if (_maxIncludes MATCHES "(-j|--parallel|--jobs) ?([0-9]*)")
-		set (_numberOfThreads "${CMAKE_MATCH_2}")
+		if (DEFINED CMAKE_MATCH_2)
+			set (_numberOfThreads "${CMAKE_MATCH_2}")
+		else()
+			set (_numberOfThreads "")
+		endif()
 		if (NOT _numberOfThreads)
 			# use all available cores
 			ProcessorCount(_numberOfThreads)
@@ -2887,8 +3093,9 @@ function (cotire_setup_pch_target _languages _configurations _target)
 		set (_dependsFiles "")
 		foreach (_language ${_languages})
 			set (_props COTIRE_${_language}_PREFIX_HEADER COTIRE_${_language}_UNITY_SOURCE)
-			if (NOT CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel")
-				# Visual Studio and Intel only create precompiled header as a side effect
+			if (NOT CMAKE_${_language}_COMPILER_ID MATCHES "MSVC|Intel" AND NOT
+				(WIN32 AND CMAKE_${_language}_COMPILER_ID MATCHES "Clang"))
+				# MSVC, Intel and clang-cl only create precompiled header as a side effect
 				list (INSERT _props 0 COTIRE_${_language}_PRECOMPILED_HEADER)
 			endif()
 			cotire_get_first_set_property_value(_dependsFile TARGET ${_target} ${_props})
@@ -2936,6 +3143,7 @@ function (cotire_collect_unity_target_sources _target _languages _unityTargetSou
 			list (APPEND _unityTargetSources ${_unityFiles})
 		endif()
 	endforeach()
+	# handle object libraries which are part of the target's sources
 	get_target_property(_linkLibrariesStrategy ${_target} COTIRE_UNITY_LINK_LIBRARIES_INIT)
 	if ("${_linkLibrariesStrategy}" MATCHES "^COPY_UNITY$")
 		cotire_filter_object_libraries(${_target} _objectLibraries ${_targetSourceFiles})
@@ -2980,21 +3188,6 @@ function (cotire_setup_unity_build_target _languages _configurations _target)
 	# determine unity target sources
 	set (_unityTargetSources "")
 	cotire_collect_unity_target_sources(${_target} "${_languages}" _unityTargetSources)
-	# handle automatic Qt processing
-	get_target_property(_targetAutoMoc ${_target} AUTOMOC)
-	get_target_property(_targetAutoUic ${_target} AUTOUIC)
-	get_target_property(_targetAutoRcc ${_target} AUTORCC)
-	if (_targetAutoMoc OR _targetAutoUic OR _targetAutoRcc)
-		# if the original target sources are subject to CMake's automatic Qt processing,
-		# also include implicitly generated <targetname>_automoc.cpp file
-		if (CMAKE_VERSION VERSION_LESS "3.8.0")
-			list (APPEND _unityTargetSources "${_target}_automoc.cpp")
-			set_property (SOURCE "${_target}_automoc.cpp" PROPERTY GENERATED TRUE)
-		else()
-			list (APPEND _unityTargetSources "${_target}_autogen/moc_compilation.cpp")
-			set_property (SOURCE "${_target}_autogen/moc_compilation.cpp" PROPERTY GENERATED TRUE)
-		endif()
-	endif()
 	# prevent AUTOMOC, AUTOUIC and AUTORCC properties from being set when the unity target is created
 	set (CMAKE_AUTOMOC OFF)
 	set (CMAKE_AUTOUIC OFF)
@@ -3008,21 +3201,6 @@ function (cotire_setup_unity_build_target _languages _configurations _target)
 	else()
 		add_library(${_unityTargetName} ${_unityTargetSubType} EXCLUDE_FROM_ALL ${_unityTargetSources})
 	endif()
-	if ("${CMAKE_GENERATOR}" MATCHES "Visual Studio")
-		# depend on original target's automoc target, if it exists
-		if (TARGET ${_target}_automoc)
-			add_dependencies(${_unityTargetName} ${_target}_automoc)
-		endif()
-	else()
-		if (_targetAutoMoc OR _targetAutoUic OR _targetAutoRcc)
-			# depend on the original target's implicitly generated <targetname>_automoc target
-			if (CMAKE_VERSION VERSION_LESS "3.8.0")
-				add_dependencies(${_unityTargetName} ${_target}_automoc)
-			else()
-				add_dependencies(${_unityTargetName} ${_target}_autogen)
-			endif()
-		endif()
-	endif()
 	# copy output location properties
 	set (_outputDirProperties
 		ARCHIVE_OUTPUT_DIRECTORY ARCHIVE_OUTPUT_DIRECTORY_<CONFIG>
@@ -3034,8 +3212,8 @@ function (cotire_setup_unity_build_target _languages _configurations _target)
 			set (_outputDir "${COTIRE_UNITY_OUTPUT_DIRECTORY}")
 		else()
 			# append relative COTIRE_UNITY_OUTPUT_DIRECTORY to target's actual output directory
-			cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName} ${_outputDirProperties})
-			cotire_resolve_config_properites("${_configurations}" _properties ${_outputDirProperties})
+			cotire_copy_set_properties("${_configurations}" TARGET ${_target} ${_unityTargetName} ${_outputDirProperties})
+			cotire_resolve_config_properties("${_configurations}" _properties ${_outputDirProperties})
 			foreach (_property ${_properties})
 				get_property(_outputDir TARGET ${_target} PROPERTY ${_property})
 				if (_outputDir)
@@ -3055,11 +3233,11 @@ function (cotire_setup_unity_build_target _languages _configurations _target)
 				RUNTIME_OUTPUT_DIRECTORY "${_outputDir}")
 		endif()
 	else()
-		cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+		cotire_copy_set_properties("${_configurations}" TARGET ${_target} ${_unityTargetName}
 			${_outputDirProperties})
 	endif()
 	# copy output name
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+	cotire_copy_set_properties("${_configurations}" TARGET ${_target} ${_unityTargetName}
 		ARCHIVE_OUTPUT_NAME ARCHIVE_OUTPUT_NAME_<CONFIG>
 		LIBRARY_OUTPUT_NAME LIBRARY_OUTPUT_NAME_<CONFIG>
 		OUTPUT_NAME OUTPUT_NAME_<CONFIG>
@@ -3067,7 +3245,7 @@ function (cotire_setup_unity_build_target _languages _configurations _target)
 		PREFIX <CONFIG>_POSTFIX SUFFIX
 		IMPORT_PREFIX IMPORT_SUFFIX)
 	# copy compile stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+	cotire_copy_set_properties("${_configurations}" TARGET ${_target} ${_unityTargetName}
 		COMPILE_DEFINITIONS COMPILE_DEFINITIONS_<CONFIG>
 		COMPILE_FLAGS COMPILE_OPTIONS
 		Fortran_FORMAT Fortran_MODULE_DIRECTORY
@@ -3079,12 +3257,12 @@ function (cotire_setup_unity_build_target _languages _configurations _target)
 		C_VISIBILITY_PRESET CXX_VISIBILITY_PRESET VISIBILITY_INLINES_HIDDEN
 		C_CLANG_TIDY CXX_CLANG_TIDY)
 	# copy compile features
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+	cotire_copy_set_properties("${_configurations}" TARGET ${_target} ${_unityTargetName}
 		C_EXTENSIONS C_STANDARD C_STANDARD_REQUIRED
 		CXX_EXTENSIONS CXX_STANDARD CXX_STANDARD_REQUIRED
 		COMPILE_FEATURES)
 	# copy interface stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+	cotire_copy_set_properties("${_configurations}" TARGET ${_target} ${_unityTargetName}
 		COMPATIBLE_INTERFACE_BOOL COMPATIBLE_INTERFACE_NUMBER_MAX COMPATIBLE_INTERFACE_NUMBER_MIN
 		COMPATIBLE_INTERFACE_STRING
 		INTERFACE_COMPILE_DEFINITIONS INTERFACE_COMPILE_FEATURES INTERFACE_COMPILE_OPTIONS
@@ -3092,8 +3270,9 @@ function (cotire_setup_unity_build_target _languages _configurations _target)
 		INTERFACE_POSITION_INDEPENDENT_CODE INTERFACE_SYSTEM_INCLUDE_DIRECTORIES
 		INTERFACE_AUTOUIC_OPTIONS NO_SYSTEM_FROM_IMPORTED)
 	# copy link stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
-		BUILD_WITH_INSTALL_RPATH INSTALL_RPATH INSTALL_RPATH_USE_LINK_PATH SKIP_BUILD_RPATH
+	cotire_copy_set_properties("${_configurations}" TARGET ${_target} ${_unityTargetName}
+		BUILD_WITH_INSTALL_RPATH BUILD_WITH_INSTALL_NAME_DIR
+		INSTALL_RPATH INSTALL_RPATH_USE_LINK_PATH SKIP_BUILD_RPATH
 		LINKER_LANGUAGE LINK_DEPENDS LINK_DEPENDS_NO_SHARED
 		LINK_FLAGS LINK_FLAGS_<CONFIG>
 		LINK_INTERFACE_LIBRARIES LINK_INTERFACE_LIBRARIES_<CONFIG>
@@ -3101,18 +3280,18 @@ function (cotire_setup_unity_build_target _languages _configurations _target)
 		LINK_SEARCH_START_STATIC LINK_SEARCH_END_STATIC
 		STATIC_LIBRARY_FLAGS STATIC_LIBRARY_FLAGS_<CONFIG>
 		NO_SONAME SOVERSION VERSION
-		LINK_WHAT_YOU_USE)
+		LINK_WHAT_YOU_USE BUILD_RPATH)
 	# copy cmake stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+	cotire_copy_set_properties("${_configurations}" TARGET ${_target} ${_unityTargetName}
 		IMPLICIT_DEPENDS_INCLUDE_TRANSFORM RULE_LAUNCH_COMPILE RULE_LAUNCH_CUSTOM RULE_LAUNCH_LINK)
 	# copy Apple platform specific stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+	cotire_copy_set_properties("${_configurations}" TARGET ${_target} ${_unityTargetName}
 		BUNDLE BUNDLE_EXTENSION FRAMEWORK FRAMEWORK_VERSION INSTALL_NAME_DIR
 		MACOSX_BUNDLE MACOSX_BUNDLE_INFO_PLIST MACOSX_FRAMEWORK_INFO_PLIST MACOSX_RPATH
 		OSX_ARCHITECTURES OSX_ARCHITECTURES_<CONFIG> PRIVATE_HEADER PUBLIC_HEADER RESOURCE XCTEST
-		IOS_INSTALL_COMBINED)
+		IOS_INSTALL_COMBINED XCODE_EXPLICIT_FILE_TYPE XCODE_PRODUCT_TYPE)
 	# copy Windows platform specific stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+	cotire_copy_set_properties("${_configurations}" TARGET ${_target} ${_unityTargetName}
 		GNUtoMS
 		COMPILE_PDB_NAME COMPILE_PDB_NAME_<CONFIG>
 		COMPILE_PDB_OUTPUT_DIRECTORY COMPILE_PDB_OUTPUT_DIRECTORY_<CONFIG>
@@ -3126,15 +3305,19 @@ function (cotire_setup_unity_build_target _languages _configurations _target)
 		VS_WINRT_COMPONENT VS_WINRT_EXTENSIONS VS_WINRT_REFERENCES
 		WIN32_EXECUTABLE WINDOWS_EXPORT_ALL_SYMBOLS
 		DEPLOYMENT_REMOTE_DIRECTORY VS_CONFIGURATION_TYPE
-		VS_SDK_REFERENCES)
+		VS_SDK_REFERENCES VS_USER_PROPS VS_DEBUGGER_WORKING_DIRECTORY)
 	# copy Android platform specific stuff
-	cotire_copy_set_properites("${_configurations}" TARGET ${_target} ${_unityTargetName}
+	cotire_copy_set_properties("${_configurations}" TARGET ${_target} ${_unityTargetName}
 		ANDROID_API ANDROID_API_MIN ANDROID_GUI
 		ANDROID_ANT_ADDITIONAL_OPTIONS ANDROID_ARCH ANDROID_ASSETS_DIRECTORIES
 		ANDROID_JAR_DEPENDENCIES ANDROID_JAR_DIRECTORIES ANDROID_JAVA_SOURCE_DIR
 		ANDROID_NATIVE_LIB_DEPENDENCIES ANDROID_NATIVE_LIB_DIRECTORIES
 		ANDROID_PROCESS_MAX ANDROID_PROGUARD ANDROID_PROGUARD_CONFIG_PATH
 		ANDROID_SECURE_PROPS_PATH ANDROID_SKIP_ANT_STEP ANDROID_STL_TYPE)
+	# copy CUDA platform specific stuff
+	cotire_copy_set_properties("${_configurations}" TARGET ${_target} ${_unityTargetName}
+		CUDA_PTX_COMPILATION CUDA_SEPARABLE_COMPILATION CUDA_RESOLVE_DEVICE_SYMBOLS
+		CUDA_EXTENSIONS CUDA_STANDARD CUDA_STANDARD_REQUIRED)
 	# use output name from original target
 	get_target_property(_targetOutputName ${_unityTargetName} OUTPUT_NAME)
 	if (NOT _targetOutputName)
@@ -3148,6 +3331,13 @@ function (cotire_setup_unity_build_target _languages _configurations _target)
 			set_property(TARGET ${_unityTargetName} PROPERTY ENABLE_EXPORTS TRUE)
 		endif()
 	endif()
+	# enable parallel compilation for MSVC
+	if (MSVC AND "${CMAKE_GENERATOR}" MATCHES "Visual Studio")
+		list (LENGTH _unityTargetSources _numberOfUnityTargetSources)
+		if (_numberOfUnityTargetSources GREATER 1)
+			set_property(TARGET ${_unityTargetName} APPEND PROPERTY COMPILE_OPTIONS "/MP")
+		endif()
+	endif()
 	cotire_init_target(${_unityTargetName})
 	cotire_add_to_unity_all_target(${_unityTargetName})
 	set_property(TARGET ${_target} PROPERTY COTIRE_UNITY_TARGET_NAME "${_unityTargetName}")
@@ -3306,6 +3496,13 @@ function (cotire_target_link_libraries _target)
 					message (STATUS "unity target ${_unityTargetName} interface link libraries: ${_unityLinkInterfaceLibraries}")
 				endif()
 			endif()
+			get_target_property(_manualDependencies ${_target} MANUALLY_ADDED_DEPENDENCIES)
+			if (_manualDependencies)
+				cotire_map_libraries("${_linkLibrariesStrategy}" _unityManualDependencies ${_manualDependencies})
+				if (_unityManualDependencies)
+					add_dependencies("${_unityTargetName}" ${_unityManualDependencies})
+				endif()
+			endif()
 		endif()
 	endif()
 endfunction(cotire_target_link_libraries)
@@ -3338,9 +3535,9 @@ function (cotire_init_target _targetName)
 		set_target_properties(${_targetName} PROPERTIES FOLDER "${COTIRE_TARGETS_FOLDER}")
 	endif()
 	set_target_properties(${_targetName} PROPERTIES EXCLUDE_FROM_ALL TRUE)
-	if (MSVC_IDE)
-		set_target_properties(${_targetName} PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD TRUE)
-	endif()
+	# if (MSVC_IDE)
+	# 	set_target_properties(${_targetName} PROPERTIES EXCLUDE_FROM_DEFAULT_BUILD TRUE)
+	# endif()
 endfunction()
 
 function (cotire_add_to_pch_all_target _pchTargetName)
@@ -3602,7 +3799,7 @@ else()
 	set (COTIRE_UNITY_SOURCE_EXCLUDE_EXTENSIONS "m;mm" CACHE STRING
 		"Ignore sources with the listed file extensions from the generated unity source.")
 
-	set (COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES "3" CACHE STRING
+	set (COTIRE_MINIMUM_NUMBER_OF_TARGET_SOURCES "2" CACHE STRING
 		"Minimum number of sources in target required to enable use of precompiled header.")
 
 	if (NOT DEFINED COTIRE_MAXIMUM_NUMBER_OF_UNITY_INCLUDES_INIT)
@@ -3701,7 +3898,7 @@ else()
 		FULL_DOCS
 			"The variable can be set to an integer > 0."
 			"If a target contains less than that number of source files, cotire will not enable the use of the precompiled header for the target."
-			"If not defined, defaults to 3."
+			"If not defined, defaults to 2."
 	)
 
 	define_property(

adm/cmake/draco.cmake

@@ -3,10 +3,6 @@
 
 OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/occt_macros")
 
-if (NOT DEFINED INSTALL_DRACO)
-  set (INSTALL_DRACO OFF CACHE BOOL "${INSTALL_DRACO_DESCR}")
-endif()
-
 if (NOT DEFINED 3RDPARTY_DRACO_DIR)
   set (3RDPARTY_DRACO_DIR "" CACHE PATH "The directory containing Draco")
 endif()
@@ -15,14 +11,24 @@ if (NOT DEFINED 3RDPARTY_DRACO_INCLUDE_DIR)
   set (3RDPARTY_DRACO_INCLUDE_DIR  "" CACHE PATH "The directory containing headers of the Draco")
 endif()
 
-if (NOT DEFINED 3RDPARTY_DRACO_LIBRARY OR NOT 3RDPARTY_DRACO_LIBRARY_DIR OR NOT EXISTS "${3RDPARTY_DRACO_LIBRARY_DIR}")
-  set (3RDPARTY_DRACO_LIBRARY "" CACHE FILEPATH "Draco library"  FORCE)
+if (NOT DEFINED 3RDPARTY_DRACO_LIBRARY)
+  set (3RDPARTY_DRACO_LIBRARY "" CACHE FILEPATH "Draco library")
 endif()
 
 if (NOT DEFINED 3RDPARTY_DRACO_LIBRARY_DIR)
   set (3RDPARTY_DRACO_LIBRARY_DIR "" CACHE PATH "The directory containing Draco library")
 endif()
 
+if (WIN32)
+  if (NOT DEFINED 3RDPARTY_DRACO_LIBRARY_DEBUG)
+    set (3RDPARTY_DRACO_LIBRARY_DEBUG "" CACHE FILEPATH "Draco debug library")
+  endif()
+  
+  if (NOT DEFINED 3RDPARTY_DRACO_LIBRARY_DIR_DEBUG)
+    set (3RDPARTY_DRACO_LIBRARY_DIR_DEBUG "" CACHE PATH "The directory containing Draco debug library")
+  endif()
+endif()
+
 if (3RDPARTY_DIR AND EXISTS "${3RDPARTY_DIR}")
   if (NOT 3RDPARTY_DRACO_DIR OR NOT EXISTS "${3RDPARTY_DRACO_DIR}")
     FIND_PRODUCT_DIR("${3RDPARTY_DIR}" draco DRACO_DIR_NAME)
@@ -32,20 +38,19 @@ if (3RDPARTY_DIR AND EXISTS "${3RDPARTY_DIR}")
   endif()
 endif()
 
-if (3RDPARTY_DRACO_DIR AND EXISTS "${3RDPARTY_DRACO_DIR}")
-  set (DRACO_INCLUDE_PATH "${3RDPARTY_DRACO_DIR}/include")
-  set (DRACO_LIBRARY_PATH "${3RDPARTY_DRACO_DIR}/lib")
-endif()
+# header
+if (NOT 3RDPARTY_DRACO_INCLUDE_DIR OR NOT EXISTS "${3RDPARTY_DRACO_INCLUDE_DIR}")
+  set (HEADER_NAMES draco)
 
-if (NOT 3RDPARTY_DRACO_INCLUDE_DIR)
-  if (DRACO_INCLUDE_PATH AND EXISTS "${DRACO_INCLUDE_PATH}")
-    set (3RDPARTY_DRACO_INCLUDE_DIR "${DRACO_INCLUDE_PATH}" CACHE FILEPATH "The directory containing headers of DRACO" FORCE)
-  endif()
-endif()
+  # set 3RDPARTY_DRACO_INCLUDE_DIR as notfound, otherwise find_path can't assign a new value to 3RDPARTY_DRACO_INCLUDE_DIR
+  set (3RDPARTY_DRACO_INCLUDE_DIR "3RDPARTY_DRACO_INCLUDE_DIR-NOTFOUND" CACHE FILEPATH "The directory containing headers of the Draco" FORCE)
 
-if (NOT 3RDPARTY_DRACO_LIBRARY_DIR)
-  if (DRACO_LIBRARY_PATH AND EXISTS "${DRACO_LIBRARY_PATH}")
-    set (3RDPARTY_DRACO_LIBRARY_DIR "${DRACO_LIBRARY_PATH}" CACHE FILEPATH "The directory containing DRACO library" FORCE)
+  if (3RDPARTY_DRACO_DIR AND EXISTS "${3RDPARTY_DRACO_DIR}")
+    find_path (3RDPARTY_DRACO_INCLUDE_DIR NAMES ${HEADER_NAMES}
+                                                 PATHS ${3RDPARTY_DRACO_DIR}
+                                                 PATH_SUFFIXES "include"
+                                                 CMAKE_FIND_ROOT_PATH_BOTH
+                                                 NO_DEFAULT_PATH)
   endif()
 endif()
 
@@ -57,11 +62,11 @@ endif()
 
 if (3RDPARTY_DRACO_DIR AND EXISTS "${3RDPARTY_DRACO_DIR}")
   if (NOT 3RDPARTY_DRACO_LIBRARY OR NOT EXISTS "${3RDPARTY_DRACO_LIBRARY}")
-    set (CMAKE_FIND_LIBRARY_SUFFIXES .lib .so .dylib .a)
+    set (CMAKE_FIND_LIBRARY_SUFFIXES .lib .a)
     set (3RDPARTY_DRACO_LIBRARY "3RDPARTY_DRACO_LIBRARY-NOTFOUND" CACHE FILEPATH "The path to Draco library" FORCE)
 
     find_library (3RDPARTY_DRACO_LIBRARY NAMES ${CSF_Draco}
-                                         PATHS "${3RDPARTY_DRACO_LIBRARY_DIR}"
+                                         PATHS "${3RDPARTY_DRACO_DIR}"
                                          PATH_SUFFIXES lib
                                          CMAKE_FIND_ROOT_PATH_BOTH
                                          NO_DEFAULT_PATH)
@@ -70,27 +75,19 @@ if (3RDPARTY_DRACO_DIR AND EXISTS "${3RDPARTY_DRACO_DIR}")
       set (3RDPARTY_DRACO_LIBRARY_DIR "${3RDPARTY_DRACO_LIBRARY_DIR}" CACHE FILEPATH "The directory containing Draco library" FORCE)
     endif()
   endif()
-endif()
 
-if (3RDPARTY_DRACO_LIBRARY_DIR AND EXISTS "${3RDPARTY_DRACO_LIBRARY_DIR}")
-  list (APPEND 3RDPARTY_LIBRARY_DIRS "${3RDPARTY_DRACO_LIBRARY_DIR}")
-else()
-  list (APPEND 3RDPARTY_NO_LIBS 3RDPARTY_DRACO_LIBRARY_DIR)
-endif()
+  if (WIN32 AND (NOT 3RDPARTY_DRACO_LIBRARY_DEBUG OR NOT EXISTS "${3RDPARTY_DRACO_LIBRARY_DEBUG}"))
+    set (CMAKE_FIND_LIBRARY_SUFFIXES .lib .a)
+    set (3RDPARTY_DRACO_LIBRARY_DEBUG "3RDPARTY_DRACO_LIBRARY_DEBUG-NOTFOUND" CACHE FILEPATH "The path to debug Draco library" FORCE)
 
-if (INSTALL_DRACO)
-  get_filename_component(3RDPARTY_DRACO_LIBRARY_REALPATH ${3RDPARTY_DRACO_LIBRARY} REALPATH)
-  if (SINGLE_GENERATOR)
-    install (FILES ${3RDPARTY_DRACO_LIBRARY_REALPATH} DESTINATION "${INSTALL_DIR_LIB}")
-  else()
-    install (FILES ${3RDPARTY_DRACO_LIBRARY_REALPATH}
-             CONFIGURATIONS Release
-             DESTINATION "${INSTALL_DIR_LIB}")
-    install (FILES ${3RDPARTY_DRACO_LIBRARY_REALPATH}
-             CONFIGURATIONS RelWithDebInfo
-             DESTINATION "${INSTALL_DIR_LIB}i")
-    install (FILES ${3RDPARTY_DRACO_LIBRARY_REALPATH}
-             CONFIGURATIONS Debug
-             DESTINATION "${INSTALL_DIR_LIB}d")
+    find_library (3RDPARTY_DRACO_LIBRARY_DEBUG NAMES ${CSF_Draco}
+                                         PATHS "${3RDPARTY_DRACO_DIR}"
+                                         PATH_SUFFIXES libd
+                                         CMAKE_FIND_ROOT_PATH_BOTH
+                                         NO_DEFAULT_PATH)
+    if (3RDPARTY_DRACO_LIBRARY_DEBUG AND EXISTS "${3RDPARTY_DRACO_LIBRARY_DEBUG}")
+      get_filename_component (3RDPARTY_DRACO_LIBRARY_DIR_DEBUG "${3RDPARTY_DRACO_LIBRARY_DEBUG}" PATH)
+      set (3RDPARTY_DRACO_LIBRARY_DIR_DEBUG "${3RDPARTY_DRACO_LIBRARY_DIR_DEBUG}" CACHE FILEPATH "The directory containing debug Draco library" FORCE)
+    endif()
   endif()
 endif()

adm/cmake/flex.cmake

@@ -26,9 +26,7 @@ if (3RDPARTY_DIR)
   endforeach()
 endif()
  
-# flex 2.5.37 is required because closest known lower version, 2.5.3 from WOK 6.8.0,
-# generates code which is unusable on Windows (includes unistd.h without any way to avoid this)
-find_package (FLEX 2.5.37)
+find_package (FLEX 2.6.4)
 
 if (NOT FLEX_FOUND OR NOT FLEX_INCLUDE_DIR OR NOT EXISTS "${FLEX_INCLUDE_DIR}/FlexLexer.h")
   list (APPEND 3RDPARTY_NOT_INCLUDED FLEX_INCLUDE_DIR)

adm/cmake/freetype.cmake

@@ -110,8 +110,19 @@ if (IS_BUILTIN_SEARCH_REQUIRED)
     set (ENV{FREETYPE_DIR} "${3RDPARTY_FREETYPE_DIR}")
   endif()
 
+  unset (FREETYPE_LIBRARY_RELEASE)
   find_package(Freetype)
 
+  # Only for UNIX (not APPLE)
+  if ((NOT WIN32) AND (NOT APPLE))
+    # To avoid linker error on Ubuntu 18.04 and others linux distributives we should
+    # link with freetype library, compiled as Position Independent Code (PIC),
+    # for example, with shared object.
+    if ((DEFINED FREETYPE_LIBRARY_RELEASE) AND (NOT "${FREETYPE_LIBRARY_RELEASE}" STREQUAL "") AND (EXISTS "${FREETYPE_LIBRARY_RELEASE}"))
+      string (REPLACE "\.a" "\.so" FREETYPE_LIBRARY_RELEASE "${FREETYPE_LIBRARY_RELEASE}")
+    endif()
+  endif()
+
   # restore ENV{FREETYPE_DIR}
   if (3RDPARTY_FREETYPE_DIR AND EXISTS "${3RDPARTY_FREETYPE_DIR}")
     set (ENV{FREETYPE_DIR} ${CACHED_FREETYPE_DIR})
@@ -122,7 +133,7 @@ if (IS_BUILTIN_SEARCH_REQUIRED)
     CHECK_PATH_FOR_CONSISTENCY (3RDPARTY_FREETYPE_DIR FREETYPE_INCLUDE_DIR_ft2build FILEPATH "The directory containing ft2build.h header")
     CHECK_PATH_FOR_CONSISTENCY (3RDPARTY_FREETYPE_DIR FREETYPE_INCLUDE_DIR_freetype2 FILEPATH "The directory containing ftheader.h header")
     if (BUILD_SHARED_LIBS)
-      CHECK_PATH_FOR_CONSISTENCY (3RDPARTY_FREETYPE_DIR FREETYPE_LIBRARY FILEPATH "freetype library")
+      CHECK_PATH_FOR_CONSISTENCY (3RDPARTY_FREETYPE_DIR FREETYPE_LIBRARY_RELEASE FILEPATH "freetype library")
     endif()
   endif()
 
@@ -141,8 +152,8 @@ if (IS_BUILTIN_SEARCH_REQUIRED)
 
   if (BUILD_SHARED_LIBS)
     if (NOT 3RDPARTY_FREETYPE_LIBRARY OR NOT EXISTS "${3RDPARTY_FREETYPE_LIBRARY}")
-      if (FREETYPE_LIBRARY AND EXISTS "${FREETYPE_LIBRARY}")
-        set (3RDPARTY_FREETYPE_LIBRARY  "${FREETYPE_LIBRARY}" CACHE FILEPATH "The path to freetype library" FORCE)
+      if (FREETYPE_LIBRARY_RELEASE AND EXISTS "${FREETYPE_LIBRARY_RELEASE}")
+        set (3RDPARTY_FREETYPE_LIBRARY  "${FREETYPE_LIBRARY_RELEASE}" CACHE FILEPATH "The path to freetype library" FORCE)
       endif()
     endif()
 
@@ -220,7 +231,7 @@ endif()
 # freetype library
 #if (BUILD_SHARED_LIBS)
   if (NOT 3RDPARTY_FREETYPE_LIBRARY OR NOT EXISTS "${3RDPARTY_FREETYPE_LIBRARY}")
-    set (CMAKE_FIND_LIBRARY_SUFFIXES .lib .so .dylib .a)
+    set (CMAKE_FIND_LIBRARY_SUFFIXES .lib .so .dylib)
 
     set (FREETYPE_PATH_SUFFIXES lib)
     if (ANDROID)
@@ -242,6 +253,16 @@ endif()
                                               CMAKE_FIND_ROOT_PATH_BOTH)
     endif()
 
+    # Only for UNIX (not APPLE)
+    if ((NOT WIN32) AND (NOT APPLE))
+      # To avoid linker error on Ubuntu 18.04 and some others linux distributives we should
+      # link with freetype library, compiled as Position Independent Code (PIC),
+      # for example, with shared object.
+      if ((DEFINED 3RDPARTY_FREETYPE_LIBRARY) AND (NOT "${3RDPARTY_FREETYPE_LIBRARY}" STREQUAL "") AND (EXISTS "${3RDPARTY_FREETYPE_LIBRARY}"))
+        string (REPLACE "\.a" "\.so" 3RDPARTY_FREETYPE_LIBRARY "${3RDPARTY_FREETYPE_LIBRARY}")
+      endif()
+    endif()
+
     if (3RDPARTY_FREETYPE_LIBRARY AND EXISTS "${3RDPARTY_FREETYPE_LIBRARY}")
       get_filename_component (3RDPARTY_FREETYPE_LIBRARY_DIR "${3RDPARTY_FREETYPE_LIBRARY}" PATH)
       set (3RDPARTY_FREETYPE_LIBRARY_DIR "${3RDPARTY_FREETYPE_LIBRARY_DIR}" CACHE PATH "The directory containing freetype library" FORCE)
@@ -350,7 +371,7 @@ endif()
 # unset all redundant variables
 OCCT_CHECK_AND_UNSET(FREETYPE_INCLUDE_DIR_ft2build)
 OCCT_CHECK_AND_UNSET(FREETYPE_INCLUDE_DIR_freetype2)
-OCCT_CHECK_AND_UNSET(FREETYPE_LIBRARY)
+OCCT_CHECK_AND_UNSET(FREETYPE_LIBRARY_RELEASE)
 
 if (BUILD_SHARED_LIBS)
   mark_as_advanced (3RDPARTY_FREETYPE_LIBRARY 3RDPARTY_FREETYPE_DLL)

adm/cmake/occt_csf.cmake

@@ -12,7 +12,7 @@ endif()
 
 # TBB
 if (USE_TBB)
-  set (CSF_TBB "tbb12 tbbmalloc")
+  set (CSF_TBB "tbb tbbmalloc")
 else()
   set (CSF_TBB)
 endif()

adm/cmake/occt_defs_flags.cmake

@@ -130,22 +130,6 @@ elseif (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR (CMAKE_CXX_COMPIL
   endif()
 endif()
 
-# Set desired C++ standard
-if     ("${BUILD_CPP_STANDARD}" STREQUAL "C++11")
-  set (CMAKE_CXX_STANDARD 11)
-elseif ("${BUILD_CPP_STANDARD}" STREQUAL "C++14")
-  set (CMAKE_CXX_STANDARD 14)
-elseif ("${BUILD_CPP_STANDARD}" STREQUAL "C++17")
-  set (CMAKE_CXX_STANDARD 17)
-elseif ("${BUILD_CPP_STANDARD}" STREQUAL "C++20")
-  set (CMAKE_CXX_STANDARD 20)
-elseif ("${BUILD_CPP_STANDARD}" STREQUAL "C++23")
-  set (CMAKE_CXX_STANDARD 23)
-else ()
-  message (FATAL_ERROR, "misprint in c++ standard name")
-endif()
-set (CMAKE_CXX_STANDARD_REQUIRED ON)
-
 if (CMAKE_CXX_COMPILER_ID MATCHES "[Cc][Ll][Aa][Nn][Gg]")
   if (APPLE)
     # CLang can be used with both libstdc++ and libc++, however on OS X libstdc++ is outdated.

adm/cmake/occt_macros.cmake

@@ -160,6 +160,8 @@ function (FIND_PRODUCT_DIR ROOT_DIR PRODUCT_NAME RESULT)
   if ("${lower_PRODUCT_NAME}" STREQUAL "egl")
     string (SUBSTRING "${lower_PRODUCT_NAME}" 1 -1 lower_PRODUCT_NAME)
     list (APPEND SEARCH_TEMPLATES "[^gl]+${lower_PRODUCT_NAME}.*")
+  elseif ("${lower_PRODUCT_NAME}" STREQUAL "tbb")
+    list (APPEND SEARCH_TEMPLATES "^.*${lower_PRODUCT_NAME}.*")
   else()
     list (APPEND SEARCH_TEMPLATES "^[^a-zA-Z]*${lower_PRODUCT_NAME}[^a-zA-Z]*${COMPILER}.*${COMPILER_BITNESS}")
     list (APPEND SEARCH_TEMPLATES "^[^a-zA-Z]*${lower_PRODUCT_NAME}[^a-zA-Z]*[0-9.]+.*${COMPILER}.*${COMPILER_BITNESS}")

adm/cmake/occt_toolkit.cmake

@@ -106,6 +106,12 @@ foreach (OCCT_PACKAGE ${USED_PACKAGES})
               set (BISON_OUTPUT_FILE_EXT "cxx")
             endif()
           endforeach()
+
+          if (EXISTS ${FLEX_BISON_TARGET_DIR}/FlexLexer.h)
+            message (STATUS "Info: remove old FLEX header file: ${FLEX_BISON_TARGET_DIR}/FlexLexer.h")
+            file(REMOVE ${FLEX_BISON_TARGET_DIR}/FlexLexer.h)
+          endif()
+
           file (STRINGS "${CURRENT_FLEX_FILE}" FILE_FLEX_CONTENT)
           foreach (FILE_FLEX_CONTENT_LINE ${FILE_FLEX_CONTENT})
             string (REGEX MATCH "%option c\\+\\+" CXX_FLEX_LANGUAGE_FOUND ${FILE_FLEX_CONTENT_LINE})
@@ -121,6 +127,19 @@ foreach (OCCT_PACKAGE ${USED_PACKAGES})
           set (BISON_OUTPUT_FILE ${CURRENT_BISON_FILE_NAME}.tab.${BISON_OUTPUT_FILE_EXT})
           set (FLEX_OUTPUT_FILE lex.${CURRENT_FLEX_FILE_NAME}.${FLEX_OUTPUT_FILE_EXT})
 
+          if (EXISTS ${FLEX_BISON_TARGET_DIR}/${CURRENT_BISON_FILE_NAME}.tab.${BISON_OUTPUT_FILE_EXT})
+            message (STATUS "Info: remove old output BISON file: ${FLEX_BISON_TARGET_DIR}/${CURRENT_BISON_FILE_NAME}.tab.${BISON_OUTPUT_FILE_EXT}")
+            file(REMOVE ${FLEX_BISON_TARGET_DIR}/${CURRENT_BISON_FILE_NAME}.tab.${BISON_OUTPUT_FILE_EXT})
+          endif()
+          if (EXISTS ${FLEX_BISON_TARGET_DIR}/${CURRENT_BISON_FILE_NAME}.tab.hxx)
+            message (STATUS "Info: remove old output BISON file: ${FLEX_BISON_TARGET_DIR}/${CURRENT_BISON_FILE_NAME}.tab.hxx")
+            file(REMOVE ${FLEX_BISON_TARGET_DIR}/${CURRENT_BISON_FILE_NAME}.tab.hxx)
+          endif()
+          if (EXISTS ${FLEX_BISON_TARGET_DIR}/${FLEX_OUTPUT_FILE})
+            message (STATUS "Info: remove old output FLEX file: ${FLEX_BISON_TARGET_DIR}/${FLEX_OUTPUT_FILE}")
+            file(REMOVE ${FLEX_BISON_TARGET_DIR}/${FLEX_OUTPUT_FILE})
+          endif()
+
           BISON_TARGET (Parser_${CURRENT_BISON_FILE_NAME} ${CURRENT_BISON_FILE} "${FLEX_BISON_TARGET_DIR}/${BISON_OUTPUT_FILE}"
                         COMPILE_FLAGS "-p ${CURRENT_BISON_FILE_NAME} -l -M ${CMAKE_SOURCE_DIR}/${RELATIVE_SOURCES_DIR}/=")
           FLEX_TARGET  (Scanner_${CURRENT_FLEX_FILE_NAME} ${CURRENT_FLEX_FILE} "${FLEX_BISON_TARGET_DIR}/${FLEX_OUTPUT_FILE}"
@@ -226,6 +245,18 @@ endif (USE_QT)
 if (EXECUTABLE_PROJECT)
   add_executable (${PROJECT_NAME} ${USED_SRCFILES} ${USED_INCFILES} ${USED_RCFILE} ${RESOURCE_FILES} ${${PROJECT_NAME}_MOC_FILES})
 
+  if (DEFINED ${PROJECT_NAME}_DISABLE_COTIRE AND ${PROJECT_NAME}_DISABLE_COTIRE)
+    set_target_properties(${PROJECT_NAME} PROPERTIES COTIRE_ENABLE_PRECOMPILED_HEADER FALSE)
+    set_target_properties(${PROJECT_NAME} PROPERTIES COTIRE_ADD_UNITY_BUILD FALSE)
+  else()
+    # To avoid excluding of PROJECT_NAME from cotire tool, we may use cotire
+    # COTIRE_PREFIX_HEADER_IGNORE_PATH instead. But, practically it causes many 'undefined symbols' error.
+    # So, we just exclude PROJECT_NAME from cotire list.
+    # if (DEFINED ${PROJECT_NAME}_COTIRE_IGNORE_PATH)
+    #   set_target_properties(${PROJECT_NAME} PROPERTIES COTIRE_PREFIX_HEADER_IGNORE_PATH "${${PROJECT_NAME}_COTIRE_IGNORE_PATH}")
+    # endif()
+  endif()
+
   install (TARGETS ${PROJECT_NAME}
            DESTINATION "${INSTALL_DIR_BIN}\${OCCT_INSTALL_BIN_LETTER}")
 
@@ -235,6 +266,18 @@ if (EXECUTABLE_PROJECT)
 else()
   add_library (${PROJECT_NAME} ${USED_SRCFILES} ${USED_INCFILES} ${USED_RCFILE} ${RESOURCE_FILES} ${${PROJECT_NAME}_MOC_FILES})
 
+  if (DEFINED ${PROJECT_NAME}_DISABLE_COTIRE AND ${PROJECT_NAME}_DISABLE_COTIRE)
+    set_target_properties(${PROJECT_NAME} PROPERTIES COTIRE_ENABLE_PRECOMPILED_HEADER FALSE)
+    set_target_properties(${PROJECT_NAME} PROPERTIES COTIRE_ADD_UNITY_BUILD FALSE)
+  else()
+    # To avoid excluding of PROJECT_NAME from cotire tool, we may use cotire
+    # COTIRE_PREFIX_HEADER_IGNORE_PATH instead. But, practically it causes many 'undefined symbols' error.
+    # So, we just exclude PROJECT_NAME from cotire list.
+    # if (DEFINED ${PROJECT_NAME}_COTIRE_IGNORE_PATH)
+    #   set_target_properties(${PROJECT_NAME} PROPERTIES COTIRE_PREFIX_HEADER_IGNORE_PATH "${${PROJECT_NAME}_COTIRE_IGNORE_PATH}")
+    # endif()
+  endif()
+
   if (MSVC)
     if (BUILD_FORCE_RelWithDebInfo)
       set (aReleasePdbConf "Release")
@@ -327,6 +370,10 @@ foreach (USED_ITEM ${USED_EXTERNLIB_AND_TOOLKITS})
             add_definitions (-DHAVE_GLES2)
           endif()
 
+          if ("${CURRENT_CSF}" STREQUAL "${CSF_Draco}")
+            set (CURRENT_CSF "")
+            set (USED_DRACO 1)
+          endif()
           set (LIBRARY_FROM_CACHE 0)
           separate_arguments (CURRENT_CSF)
           foreach (CSF_LIBRARY ${CURRENT_CSF})
@@ -354,7 +401,7 @@ foreach (USED_ITEM ${USED_EXTERNLIB_AND_TOOLKITS})
             endforeach()
           endforeach()
 
-          if (NOT ${LIBRARY_FROM_CACHE})
+          if (NOT ${LIBRARY_FROM_CACHE} AND NOT "${CURRENT_CSF}" STREQUAL "")
             # prepare a list from a string with whitespaces
             separate_arguments (CURRENT_CSF)
             list (APPEND USED_EXTERNAL_LIBS_BY_CURRENT_PROJECT ${CURRENT_CSF})
@@ -365,6 +412,28 @@ foreach (USED_ITEM ${USED_EXTERNLIB_AND_TOOLKITS})
   endif()
 endforeach()
 
+if (USE_DRACO)
+  if (USED_DRACO)
+    set (USED_LIB_RELEASE ${3RDPARTY_DRACO_LIBRARY})
+    if (WIN32)
+      set (USED_LIB_DEBUG ${3RDPARTY_DRACO_LIBRARY_DEBUG})
+    else()
+      set (USED_LIB_DEBUG ${3RDPARTY_DRACO_LIBRARY})
+    endif()
+    set (USED_LIB_CONF)
+    if (EXISTS ${USED_LIB_DEBUG})
+      set (USED_LIB_CONF "$<$<CONFIG:DEBUG>:${USED_LIB_DEBUG}>;${USED_LIB_CONF}")
+    endif()
+    if (EXISTS ${USED_LIB_RELEASE})
+      set (USED_LIB_CONF "$<$<CONFIG:RELEASE>:${USED_LIB_RELEASE}>;${USED_LIB_CONF}")
+      set (USED_LIB_CONF "$<$<CONFIG:RELWITHDEBINFO>:${USED_LIB_RELEASE}>;${USED_LIB_CONF}")
+    endif()
+    if (DEFINED USED_LIB_CONF)
+      set_property (TARGET ${PROJECT_NAME} APPEND PROPERTY LINK_LIBRARIES "${USED_LIB_CONF}")
+    endif()
+  endif()
+endif()
+
 if (APPLE)
   list (FIND USED_EXTERNAL_LIBS_BY_CURRENT_PROJECT X11 IS_X11_FOUND)
   if (NOT ${IS_X11_FOUND} EQUAL -1)

adm/cmake/tbb.cmake

@@ -1,294 +1,240 @@
 # tbb
 
-if (NOT DEFINED INSTALL_TBB AND BUILD_SHARED_LIBS)
-  set (INSTALL_TBB OFF CACHE BOOL "${INSTALL_TBB_DESCR}")
-endif()
-
-# tbb directory
-if (NOT DEFINED 3RDPARTY_TBB_DIR)
-  set (3RDPARTY_TBB_DIR "" CACHE PATH "The directory containing tbb")
-endif()
-
 if (MSVC AND BUILD_SHARED_LIBS)
   add_definitions (-D__TBB_NO_IMPLICIT_LINKAGE)
   add_definitions (-D__TBBMALLOC_NO_IMPLICIT_LINKAGE)
 endif()
 
-# include occt macros. compiler_bitness, os_wiht_bit, compiler
-OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/occt_macros")
+if (NOT DEFINED INSTALL_TBB AND BUILD_SHARED_LIBS)
+  set (INSTALL_TBB OFF CACHE BOOL "${INSTALL_TBB_DESCR}")
+endif()
 
-# specify TBB folder in connectin with 3RDPARTY_DIR
-if (3RDPARTY_DIR AND EXISTS "${3RDPARTY_DIR}")
-  #CHECK_PATH_FOR_CONSISTENCY (3RDPARTY_DIR 3RDPARTY_TBB_DIR PATH "The directory containing tbb")
+# Initialize tbb directory.
+if (NOT DEFINED 3RDPARTY_TBB_DIR)
+  set (3RDPARTY_TBB_DIR "" CACHE PATH "The directory containing tbb")
+endif()
 
-  if (NOT 3RDPARTY_TBB_DIR OR NOT EXISTS "${3RDPARTY_TBB_DIR}")
+if (WIN32)
+  if (NOT DEFINED 3RDPARTY_DIR)
+    message (FATAL_ERROR "3RDPARTY_DIR is not defined.")
+  endif()
+  if ("${3RDPARTY_DIR}" STREQUAL "")
+    message (FATAL_ERROR "3RDPARTY_DIR is empty string.")
+  endif()
+  if (NOT EXISTS "${3RDPARTY_DIR}")
+    message (FATAL_ERROR "3RDPARTY_DIR is not exist.")
+  endif()
+
+  # Below, we have correct 3RDPARTY_DIR.
+
+  # Initialize TBB folder in connectin with 3RDPARTY_DIR.
+  if (("${3RDPARTY_TBB_DIR}" STREQUAL "") OR (NOT EXISTS "${3RDPARTY_TBB_DIR}"))
     FIND_PRODUCT_DIR ("${3RDPARTY_DIR}" TBB TBB_DIR_NAME)
     if (TBB_DIR_NAME)
       set (3RDPARTY_TBB_DIR "${3RDPARTY_DIR}/${TBB_DIR_NAME}" CACHE PATH "The directory containing tbb" FORCE)
     endif()
   endif()
-else()
-  #set (3RDPARTY_TBB_DIR "" CACHE PATH "The directory containing TBB" FORCE)
-endif()
 
-if (NOT DEFINED 3RDPARTY_TBB_INCLUDE_DIR)
-  set (3RDPARTY_TBB_INCLUDE_DIR "" CACHE PATH "The directory containing headers of the TBB")
-endif()
+  # Here we have full path name to installation directory of TBB.
+  # Employ it.
+  if (EXISTS "${3RDPARTY_TBB_DIR}")
+    find_package (
+      TBB 2021.5
+      PATHS "${3RDPARTY_TBB_DIR}" NO_DEFAULT_PATH
+      REQUIRED
+      CONFIG)
 
-if (3RDPARTY_TBB_DIR AND EXISTS "${3RDPARTY_TBB_DIR}")
-    # check 3RDPARTY_TBB_INCLUDE_DIR for consictency with specified 3RDPARTY_TBB_DIR
-    CHECK_PATH_FOR_CONSISTENCY (3RDPARTY_TBB_DIR 3RDPARTY_TBB_INCLUDE_DIR PATH "The directory containing headers of the TBB")
-endif()
-
-# tbb.h
-if (NOT 3RDPARTY_TBB_INCLUDE_DIR OR NOT EXISTS "${3RDPARTY_TBB_INCLUDE_DIR}")
-
-  set (HEADER_NAMES tbb.h tbb/tbb.h)
-
-  # set 3RDPARTY_TBB_INCLUDE_DIR as notfound, otherwise find_library can't assign a new value to 3RDPARTY_TBB_INCLUDE_DIR
-  set (3RDPARTY_TBB_INCLUDE_DIR "3RDPARTY_TBB_INCLUDE_DIR-NOTFOUND" CACHE PATH "the path to tbb.h" FORCE)
-
-  if (3RDPARTY_TBB_DIR AND EXISTS "${3RDPARTY_TBB_DIR}")
-    find_path (3RDPARTY_TBB_INCLUDE_DIR NAMES ${HEADER_NAMES}
-                                              PATHS ${3RDPARTY_TBB_DIR}
-                                              PATH_SUFFIXES include
-                                              CMAKE_FIND_ROOT_PATH_BOTH
-                                              NO_DEFAULT_PATH)
-  else()
-    find_path (3RDPARTY_TBB_INCLUDE_DIR NAMES ${HEADER_NAMES}
-                                              PATH_SUFFIXES include
-                                              CMAKE_FIND_ROOT_PATH_BOTH)
-  endif()
-endif()
-
-if (3RDPARTY_TBB_INCLUDE_DIR AND EXISTS "${3RDPARTY_TBB_INCLUDE_DIR}")
-  list (APPEND 3RDPARTY_INCLUDE_DIRS "${3RDPARTY_TBB_INCLUDE_DIR}")
-else()
-  list (APPEND 3RDPARTY_NOT_INCLUDED 3RDPARTY_TBB_INCLUDE_DIR)
-
-  set (3RDPARTY_TBB_INCLUDE_DIR "" CACHE PATH "the path to tbb.h" FORCE)
-endif()
-
-# common steps for tbb12 and tbbmalloc
-macro (TBB_PRODUCT_SEARCH PRODUCT_LIBRARY_NAME)
-
-  string (TOUPPER ${PRODUCT_LIBRARY_NAME} upper_PRODUCT_LIBRARY_NAME)
-
-  # define required tbb12/tbbmalloc variables
-  if (NOT DEFINED 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY OR NOT 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR OR NOT EXISTS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR}")
-    set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY "" CACHE FILEPATH "${upper_PRODUCT_LIBRARY_NAME} library" FORCE)
-  endif()
-
-  if (NOT DEFINED 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR)
-    set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR "" CACHE PATH "The directory containing ${upper_PRODUCT_LIBRARY_NAME} library")
-  endif()
-
-  if (WIN32)
-    if (NOT DEFINED 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL OR NOT 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR OR NOT EXISTS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR}")
-      set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL "" CACHE FILEPATH "${upper_PRODUCT_LIBRARY_NAME} shared library" FORCE)
+    # Achive include directory
+    get_target_property (TBB_INCLUDE_DIR TBB::tbb INTERFACE_INCLUDE_DIRECTORIES)
+    if (NOT DEFINED 3RDPARTY_TBB_INCLUDE_DIR)
+      set (3RDPARTY_TBB_INCLUDE_DIR "" CACHE PATH "The directory containing headers of the TBB")
     endif()
-  endif()
-
-  if (WIN32 AND NOT DEFINED 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR)
-    set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR "" CACHE PATH "The directory containing ${upper_PRODUCT_LIBRARY_NAME} shared library")
-  endif()
-
-  # check 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_ paths for consistency with specified 3RDPARTY_TBB_DIR
-  if (3RDPARTY_TBB_DIR AND EXISTS "${3RDPARTY_TBB_DIR}")
-    CHECK_PATH_FOR_CONSISTENCY (3RDPARTY_TBB_DIR 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY FILEPATH "the path to ${upper_PRODUCT_LIBRARY_NAME} library")
-
-    if (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY AND EXISTS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY}")
-      get_filename_component (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY}" PATH)
-      set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR}" CACHE PATH "The directory containing ${upper_PRODUCT_LIBRARY_NAME} library" FORCE)
+    if (EXISTS "${TBB_INCLUDE_DIR}")
+      set (3RDPARTY_TBB_INCLUDE_DIR "${TBB_INCLUDE_DIR}" CACHE PATH "The directory containing headers of the TBB" FORCE)
+      list (APPEND 3RDPARTY_INCLUDE_DIRS "${3RDPARTY_TBB_INCLUDE_DIR}")
     else()
-      CHECK_PATH_FOR_CONSISTENCY (3RDPARTY_TBB_DIR 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR PATH "The directory containing ${upper_PRODUCT_LIBRARY_NAME} library")
+      list (APPEND 3RDPARTY_NOT_INCLUDED 3RDPARTY_TBB_INCLUDE_DIR)
     endif()
 
-    if (WIN32)
-      CHECK_PATH_FOR_CONSISTENCY (3RDPARTY_TBB_DIR 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL FILEPATH "the path to ${upper_PRODUCT_LIBRARY_NAME} shared library")
+    separate_arguments (CSF_TBB)
+    foreach (LIB IN LISTS CSF_TBB)
+      string(TOLOWER "${LIB}" LIB_LOWER)
+      string(TOUPPER "${LIB}" LIB_UPPER)
 
-      if (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL AND EXISTS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL}")
-        get_filename_component (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL}" PATH)
-        set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR}" CACHE PATH "The directory containing ${upper_PRODUCT_LIBRARY_NAME} shared library" FORCE)
-      else()
-
-      CHECK_PATH_FOR_CONSISTENCY (3RDPARTY_TBB_DIR 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR PATH "The directory containing ${upper_PRODUCT_LIBRARY_NAME} shared library")
+      # Achive *.lib files and directory containing it.
+      get_target_property (TBB_LIB_FILE "TBB::${LIB_LOWER}" IMPORTED_IMPLIB_RELEASE)
+      # Reserve cache variable for *.lib.
+      if (NOT DEFINED 3RDPARTY_${LIB_UPPER}_LIBRARY)
+        set (3RDPARTY_${LIB_UPPER}_LIBRARY "" CACHE FILEPATH "${LIB_UPPER} library (*.lib)")
       endif()
-    endif()
-  endif()
-
-  OCCT_MAKE_COMPILER_SHORT_NAME()
-  OCCT_MAKE_COMPILER_BITNESS()
-
-  if (${COMPILER_BITNESS} EQUAL 32)
-    set (${upper_PRODUCT_LIBRARY_NAME}_ARCH_NAME ia32)
-  else()
-    set (${upper_PRODUCT_LIBRARY_NAME}_ARCH_NAME intel64)
-  endif()
-
-  # tbb12/tbbmalloc library
-  if (NOT 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY OR NOT EXISTS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY}")
-    
-    set (CMAKE_FIND_LIBRARY_SUFFIXES .lib .so .dylib .a)
-    set (PRODUCT_PATH_SUFFIXES lib ${PRODUCT_LIBRARY_NAME})
-
-    # set 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY as notfound, otherwise find_library can't assign a new value to 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY
-    set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY "3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY-NOTFOUND" CACHE FILEPATH "The path to ${upper_PRODUCT_LIBRARY_NAME} library" FORCE)
-
-    if (3RDPARTY_TBB_DIR AND EXISTS "${3RDPARTY_TBB_DIR}")
-      if (NOT EXISTS "${3RDPARTY_TBB_DIR}/lib/${${upper_PRODUCT_LIBRARY_NAME}_ARCH_NAME}/${COMPILER}")
-        if (EXISTS "${3RDPARTY_TBB_DIR}/lib/${${upper_PRODUCT_LIBRARY_NAME}_ARCH_NAME}")
-          file (GLOB ${upper_PRODUCT_LIBRARY_NAME}_COMPILER_LIST "${3RDPARTY_TBB_DIR}/lib/${${upper_PRODUCT_LIBRARY_NAME}_ARCH_NAME}/*")
-          if (${upper_PRODUCT_LIBRARY_NAME}_COMPILER_LIST)
-            list (GET ${upper_PRODUCT_LIBRARY_NAME}_COMPILER_LIST -1 THE_MOST_FRESH_COMPILER_VERSION)
-            if (THE_MOST_FRESH_COMPILER_VERSION)
-              get_filename_component (THE_MOST_FRESH_COMPILER_VERSION_NAME "${THE_MOST_FRESH_COMPILER_VERSION}" NAME)
-              set (PRODUCT_PATH_SUFFIXES lib ${PRODUCT_LIBRARY_NAME} lib/${${upper_PRODUCT_LIBRARY_NAME}_ARCH_NAME}/${THE_MOST_FRESH_COMPILER_VERSION_NAME})
-            endif()
-          endif()
-        endif()
+      # Reserve cache variable for directory containing *.lib file.
+      if (NOT DEFINED 3RDPARTY_${LIB_UPPER}_LIBRARY_DIR)
+        set (3RDPARTY_${LIB_UPPER}_LIBRARY_DIR "" CACHE PATH "The directory containing ${LIB_UPPER} library (*.lib)")
+      endif()
+      if (EXISTS "${TBB_LIB_FILE}")
+        set (3RDPARTY_${LIB_UPPER}_LIBRARY
+             "${TBB_LIB_FILE}"
+             CACHE FILEPATH
+             "${LIB_UPPER} library (*.lib)"
+             FORCE)
+        get_filename_component (TBB_LIB_FILE_DIRECTORY "${TBB_LIB_FILE}" DIRECTORY)
+        set (3RDPARTY_${LIB_UPPER}_LIBRARY_DIR
+             "${TBB_LIB_FILE_DIRECTORY}"
+             CACHE PATH
+             "The directory containing ${LIB_UPPER} library (*.lib)"
+             FORCE)
+        list (APPEND 3RDPARTY_LIBRARY_DIRS "${3RDPARTY_${LIB_UPPER}_LIBRARY_DIR}")
       else()
-        set (PRODUCT_PATH_SUFFIXES lib ${PRODUCT_LIBRARY_NAME} lib/${${upper_PRODUCT_LIBRARY_NAME}_ARCH_NAME}/${COMPILER})
+        list (APPEND 3RDPARTY_NO_LIBS 3RDPARTY_${LIB_UPPER}_LIBRARY_DIR)
       endif()
 
-      find_library (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY ${PRODUCT_LIBRARY_NAME}
-                                         PATHS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR}" "${3RDPARTY_TBB_DIR}"
-                                         PATH_SUFFIXES ${PRODUCT_PATH_SUFFIXES}
-                                         CMAKE_FIND_ROOT_PATH_BOTH
-                                         NO_DEFAULT_PATH)
-    else()
-      find_library (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY ${PRODUCT_LIBRARY_NAME}
-                                         PATH_SUFFIXES ${PRODUCT_PATH_SUFFIXES}
-                                         CMAKE_FIND_ROOT_PATH_BOTH)
-    endif()
+      # Achive *.dll files and directory containing it.
+      get_target_property (TBB_DLL_FILE "TBB::${LIB_LOWER}" IMPORTED_LOCATION_RELEASE)
+      # Reserve cache variable for *.dll.
+      if (NOT DEFINED 3RDPARTY_${LIB_UPPER}_DLL)
+        set (3RDPARTY_${LIB_UPPER}_DLL "" CACHE FILEPATH "${LIB_UPPER} library (*.dll)")
+      endif()
+      # Reserve cache variable for directory containing *.dll file.
+      if (NOT DEFINED 3RDPARTY_${LIB_UPPER}_DLL_DIR)
+        set (3RDPARTY_${LIB_UPPER}_DLL_DIR "" CACHE PATH "The directory containing ${LIB_UPPER} library (*.dll)")
+      endif()
+      if (EXISTS "${TBB_DLL_FILE}")
+        set (3RDPARTY_${LIB_UPPER}_DLL
+             "${TBB_DLL_FILE}"
+             CACHE FILEPATH
+             "${LIB_UPPER} library (*.dll)"
+             FORCE)
+        get_filename_component (TBB_DLL_FILE_DIRECTORY "${TBB_DLL_FILE}" DIRECTORY)
+        set (3RDPARTY_${LIB_UPPER}_DLL_DIR
+             "${TBB_DLL_FILE_DIRECTORY}"
+             CACHE PATH
+             "The directory containing ${LIB_UPPER} library (*.dll)"
+             FORCE)
+        list (APPEND 3RDPARTY_DLL_DIRS "${3RDPARTY_${LIB_UPPER}_DLL_DIR}")
+      else()
+        list (APPEND 3RDPARTY_NO_DLLS 3RDPARTY_${LIB_UPPER}_DLL_DIR)
+      endif()
 
-    if (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY AND EXISTS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY}")
-      get_filename_component (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY}" PATH)
-      set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR}" CACHE PATH "The directory containing ${upper_PRODUCT_LIBRARY_NAME} library" FORCE)
-    else()
-      set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR "" CACHE PATH "The directory containing ${upper_PRODUCT_LIBRARY_NAME} library" FORCE)
-    endif()
-  endif()
+      # install *.dll (tbb & tbbmalloc)
+      if (INSTALL_TBB)
+        OCCT_MAKE_OS_WITH_BITNESS()
+        OCCT_MAKE_COMPILER_SHORT_NAME()
 
-  if (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR AND EXISTS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR}")
-    list (APPEND 3RDPARTY_LIBRARY_DIRS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR}")
-  else()
-    list (APPEND 3RDPARTY_NO_LIBS 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY_DIR)
-
-    set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY "" CACHE FILEPATH "The path to ${upper_PRODUCT_LIBRARY_NAME} library" FORCE)
-  endif()
-
-  # tbb12/tbbmalloc shared library
-  if (WIN32)
-    if (NOT 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL OR NOT EXISTS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL}")
-      set (CMAKE_FIND_LIBRARY_SUFFIXES .dll)
-      set (PRODUCT_PATH_SUFFIXES bin)
-
-      # set 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL as notfound, otherwise find_library can't assign a new value to 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL
-      set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL "3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL-NOTFOUND" CACHE FILEPATH "${upper_PRODUCT_LIBRARY_NAME} shared library" FORCE)
-
-      if (3RDPARTY_TBB_DIR AND EXISTS "${3RDPARTY_TBB_DIR}")
-        if (NOT EXISTS "${3RDPARTY_TBB_DIR}/bin/${${upper_PRODUCT_LIBRARY_NAME}_ARCH_NAME}/${COMPILER}")
-          if (EXISTS "${3RDPARTY_TBB_DIR}/bin/${${upper_PRODUCT_LIBRARY_NAME}_ARCH_NAME}")
-            file (GLOB ${upper_PRODUCT_LIBRARY_NAME}_COMPILER_LIST "${3RDPARTY_TBB_DIR}/bin/${${upper_PRODUCT_LIBRARY_NAME}_ARCH_NAME}/*")
-            if (${upper_PRODUCT_LIBRARY_NAME}_COMPILER_LIST)
-              list (GET ${upper_PRODUCT_LIBRARY_NAME}_COMPILER_LIST -1 THE_MOST_FRESH_COMPILER_VERSION)
-              if (THE_MOST_FRESH_COMPILER_VERSION)
-                get_filename_component (THE_MOST_FRESH_COMPILER_VERSION_NAME "${THE_MOST_FRESH_COMPILER_VERSION}" NAME)
-                set (PRODUCT_PATH_SUFFIXES bin bin/${${upper_PRODUCT_LIBRARY_NAME}_ARCH_NAME}/${THE_MOST_FRESH_COMPILER_VERSION_NAME})
-              endif()
-            endif()
-          endif()
+        if (SINGLE_GENERATOR)
+          install (FILES ${3RDPARTY_${LIB_UPPER}_DLL} DESTINATION "${INSTALL_DIR_BIN}")
         else()
-          set (PRODUCT_PATH_SUFFIXES bin bin/${${upper_PRODUCT_LIBRARY_NAME}_ARCH_NAME}/${COMPILER})
-        endif()
-
-        if (3RDPARTY_TBB_DIR AND EXISTS "${3RDPARTY_TBB_DIR}")
-          find_library (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL ${PRODUCT_LIBRARY_NAME}
-                                         PATHS "${3RDPARTY_TBB_DIR}"
-                                         PATH_SUFFIXES ${PRODUCT_PATH_SUFFIXES}
-                                         NO_DEFAULT_PATH)
-        else()
-          find_library (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL ${PRODUCT_LIBRARY_NAME} PATH_SUFFIXES ${PRODUCT_PATH_SUFFIXES})
-        endif()
-
-        if (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL AND EXISTS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL}")
-          get_filename_component (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL}" PATH)
-          set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR}" CACHE PATH "The directory containing ${upper_PRODUCT_LIBRARY_NAME} library" FORCE)
-        else()
-          set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR "" CACHE PATH "The directory containing ${upper_PRODUCT_LIBRARY_NAME} shared library" FORCE)
-
-          set (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL "" CACHE FILEPATH "${upper_PRODUCT_LIBRARY_NAME} shared library" FORCE)
+          install (FILES ${3RDPARTY_${LIB_UPPER}_DLL} CONFIGURATIONS Release DESTINATION "${INSTALL_DIR_BIN}")
+          install (FILES ${3RDPARTY_${LIB_UPPER}_DLL} CONFIGURATIONS RelWithDebInfo DESTINATION "${INSTALL_DIR_BIN}i")
+          install (FILES ${3RDPARTY_${LIB_UPPER}_DLL} CONFIGURATIONS Debug DESTINATION "${INSTALL_DIR_BIN}d")
         endif()
       endif()
-    endif()
-
-    if (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR OR EXISTS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR}")
-      list (APPEND 3RDPARTY_DLL_DIRS "${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR}")
+      mark_as_advanced (3RDPARTY_${LIB_UPPER}_LIBRARY 3RDPARTY_${LIB_UPPER}_DLL)
+    endforeach()
+    if (INSTALL_TBB)
+      set (USED_3RDPARTY_TBB_DIR "")
     else()
-      list (APPEND 3RDPARTY_NO_DLLS 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL_DIR)
+      # the *.dll/*.so* directory for using by the executable
+      set (USED_3RDPARTY_TBB_DIR ${3RDPARTY_TBB_DLL_DIR})
     endif()
+  else()
+    message (FATAL_ERROR "Installation directory with TBB is not exist.")
+  endif()
+else ()
+  # NOT WIN32 branch
+  if ((DEFINED 3RDPARTY_DIR) AND (NOT "${3RDPARTY_DIR}" STREQUAL "") AND (EXISTS "${3RDPARTY_DIR}"))
+    # Here, we have correct 3RDPARTY_DIR.
+    # Trying to specify TBB folder in connection with 3RDPARTY_DIR
+    if (("${3RDPARTY_TBB_DIR}" STREQUAL "") OR (NOT EXISTS "${3RDPARTY_TBB_DIR}"))
+      FIND_PRODUCT_DIR ("${3RDPARTY_DIR}" TBB TBB_DIR_NAME)
+      if (TBB_DIR_NAME)
+        set (3RDPARTY_TBB_DIR "${3RDPARTY_DIR}/${TBB_DIR_NAME}" CACHE PATH "The directory containing tbb" FORCE)
+      endif()
+    endif()
+    if ((NOT "${3RDPARTY_TBB_DIR}" STREQUAL "") AND (EXISTS "${3RDPARTY_TBB_DIR}"))
+      # Find TBB 2021.5 in existing directory.
+      find_package (
+      TBB 2021.5
+      PATHS "${3RDPARTY_TBB_DIR}" NO_DEFAULT_PATH
+      REQUIRED
+      CONFIG)
+    else()
+      # Find TBB 2021.5 in system directory.
+      find_package (
+      TBB 2021.5
+      REQUIRED
+      CONFIG)
+    endif()
+  else()
+    # Find TBB 2021.5 in system directory.
+    find_package (
+    TBB 2021.5
+    REQUIRED
+    CONFIG)
+  endif()
+  # TBB has been configured (in other case FATAL_ERROR occures).
+
+  # Achive include directory.
+  get_target_property (TBB_INCLUDE_DIR TBB::tbb INTERFACE_INCLUDE_DIRECTORIES)
+  if (NOT DEFINED 3RDPARTY_TBB_INCLUDE_DIR)
+    set (3RDPARTY_TBB_INCLUDE_DIR "" CACHE PATH "The directory containing headers of the TBB")
+  endif()
+  if (EXISTS "${TBB_INCLUDE_DIR}")
+    set (3RDPARTY_TBB_INCLUDE_DIR "${TBB_INCLUDE_DIR}" CACHE PATH "The directory containing headers of the TBB" FORCE)
+    list (APPEND 3RDPARTY_INCLUDE_DIRS "${3RDPARTY_TBB_INCLUDE_DIR}")
+  else()
+    list (APPEND 3RDPARTY_NOT_INCLUDED 3RDPARTY_TBB_INCLUDE_DIR)
   endif()
 
-  # install tbb12/tbbmalloc
-  if (INSTALL_TBB)
-    OCCT_MAKE_OS_WITH_BITNESS()
-    OCCT_MAKE_COMPILER_SHORT_NAME()
-
-    if (WIN32)
-      if (SINGLE_GENERATOR)
-        install (FILES ${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL} DESTINATION "${INSTALL_DIR_BIN}")
-      else()
-        install (FILES ${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL}
-                 CONFIGURATIONS Release
-                 DESTINATION "${INSTALL_DIR_BIN}")
-        install (FILES ${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL}
-                 CONFIGURATIONS RelWithDebInfo
-                 DESTINATION "${INSTALL_DIR_BIN}i")
-        install (FILES ${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL}
-                 CONFIGURATIONS Debug
-                 DESTINATION "${INSTALL_DIR_BIN}d")
-      endif()
-    else()
-      get_filename_component (PRODUCT_LIBRARY_NAME ${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY} NAME)
-
-      if (SINGLE_GENERATOR)
-        install (FILES ${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY}.2
-                 DESTINATION "${INSTALL_DIR_LIB}"
-                 RENAME ${PRODUCT_LIBRARY_NAME}.2)
-      else()
-        install (FILES ${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY}.2
-                 CONFIGURATIONS Release
-                 DESTINATION "${INSTALL_DIR_LIB}"
-                 RENAME ${PRODUCT_LIBRARY_NAME}.2)
-        install (FILES ${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY}.2
-                 CONFIGURATIONS RelWithDebInfo
-                 DESTINATION "${INSTALL_DIR_LIB}i"
-                 RENAME ${PRODUCT_LIBRARY_NAME}.2)
-        install (FILES ${3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY}.2
-                 CONFIGURATIONS Debug
-                 DESTINATION "${INSTALL_DIR_LIB}d"
-                 RENAME ${PRODUCT_LIBRARY_NAME}.2)
-      endif()
-    endif()
-  endif()
-  mark_as_advanced (3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_LIBRARY 3RDPARTY_${upper_PRODUCT_LIBRARY_NAME}_DLL)
-endmacro()
-
-#if (BUILD_SHARED_LIBS)
   separate_arguments (CSF_TBB)
   foreach (LIB IN LISTS CSF_TBB)
-    TBB_PRODUCT_SEARCH (${LIB})
-  endforeach()
+    string(TOLOWER "${LIB}" LIB_LOWER)
+    string(TOUPPER "${LIB}" LIB_UPPER)
 
+    # Achive *.so files and directory containing it.
+    get_target_property (TBB_SO_FILE "TBB::${LIB_LOWER}" IMPORTED_LOCATION_RELEASE)
+    # Reserve cache variable for *.so.
+    if (NOT DEFINED 3RDPARTY_${LIB_UPPER}_LIBRARY)
+      set (3RDPARTY_${LIB_UPPER}_LIBRARY "" CACHE FILEPATH "${LIB_UPPER} library (*.so)")
+    endif()
+    # Reserve cache variable for directory containing *.so file.
+    if (NOT DEFINED 3RDPARTY_${LIB_UPPER}_LIBRARY_DIR)
+      set (3RDPARTY_${LIB_UPPER}_LIBRARY_DIR "" CACHE PATH "The directory containing ${LIB_UPPER} library (*.so)")
+    endif()
+    if (EXISTS "${TBB_SO_FILE}")
+      set (3RDPARTY_${LIB_UPPER}_LIBRARY
+           "${TBB_SO_FILE}"
+           CACHE FILEPATH
+           "${LIB_UPPER} library (*.so)"
+           FORCE)
+      get_filename_component (TBB_SO_FILE_DIRECTORY "${TBB_SO_FILE}" DIRECTORY)
+      set (3RDPARTY_${LIB_UPPER}_LIBRARY_DIR
+           "${TBB_SO_FILE_DIRECTORY}"
+           CACHE PATH
+           "The directory containing ${LIB_UPPER} library (*.so)"
+           FORCE)
+      list (APPEND 3RDPARTY_LIBRARY_DIRS "${3RDPARTY_${LIB_UPPER}_LIBRARY_DIR}")
+    else()
+      list (APPEND 3RDPARTY_NO_LIBS 3RDPARTY_${LIB_UPPER}_LIBRARY_DIR)
+    endif()
+
+    # install *.so* (tbb & tbbmalloc)
+    if (INSTALL_TBB)
+      OCCT_MAKE_OS_WITH_BITNESS()
+      OCCT_MAKE_COMPILER_SHORT_NAME()
+
+      if (SINGLE_GENERATOR)
+        install (FILES ${3RDPARTY_${LIB_UPPER}_LIBRARY} DESTINATION "${INSTALL_DIR_LIB}")
+      else()
+        install (FILES ${3RDPARTY_${LIB_UPPER}_LIBRARY} CONFIGURATIONS Release DESTINATION "${INSTALL_DIR_LIB}")
+        install (FILES ${3RDPARTY_${LIB_UPPER}_LIBRARY} CONFIGURATIONS RelWithDebInfo DESTINATION "${INSTALL_DIR_LIB}i")
+        install (FILES ${3RDPARTY_${LIB_UPPER}_LIBRARY} CONFIGURATIONS Debug DESTINATION "${INSTALL_DIR_LIB}d")
+      endif()
+    endif()
+  endforeach()
   if (INSTALL_TBB)
     set (USED_3RDPARTY_TBB_DIR "")
   else()
-    # the library directory for using by the executable
-    if (WIN32)
-      set (USED_3RDPARTY_TBB_DIR ${3RDPARTY_TBB12_DLL_DIR})
-    else()
-      set (USED_3RDPARTY_TBB_DIR ${3RDPARTY_TBB12_LIBRARY_DIR})
-    endif()
+    # the *.so* directory for using by the executable
+    set (USED_3RDPARTY_TBB_DIR ${3RDPARTY_TBB_LIBRARY_DIR})
   endif()
-#endif()
+endif()

adm/genconfdeps.tcl

@@ -775,7 +775,7 @@ proc wokdep:SearchTBB {theErrInc theErrLib32 theErrLib64 theErrBin32 theErrBin64
         lappend ::CSF_OPT_LIB$anArchIter "$aPath/lib/$aSubDir/$aVcLib"
       }
       if { "$aTbbLibPath" == "" } {
-        lappend anErrLib$anArchIter "Error: '${::SYS_LIB_PREFIX}tbb12.${::SYS_LIB_SUFFIX}' not found (Intel TBB)"
+        lappend anErrLib$anArchIter "Error: '${::SYS_LIB_PREFIX}tbb.${::SYS_LIB_SUFFIX}' not found (Intel TBB)"
         if { "$::ARCH" == "$anArchIter"} { set isFound "false" }
       }
     }

adm/genproj.tcl

@@ -1233,28 +1233,11 @@ proc osutils:convertModules { theModules theSrcDir theSourceDirOther theProjects
       lappend aProjectsInModule($aModule) $aToolKit
       lappend aDependencies [LibToLink $aToolKit $theSrcDir $theSourceDirOther]
     }
-    # executables, assume one project per cxx file...
+    # executables
     foreach aUnit [OS:executable ${aModule}] {
-      set aUnitLoc $aUnit
-      set src_files [_get_used_files $aUnit $theSrcDir false]
-      set aSrcFiles {}
-      foreach s $src_files {
-        regexp {source ([^\s]+)} $s dummy name
-        lappend aSrcFiles $name
-      }
-      foreach aSrcFile $aSrcFiles {
-        set aFileExtension [file extension $aSrcFile]
-        if { $aFileExtension == ".cxx" } {
-          set aPrjName [file rootname $aSrcFile]
-          lappend aProjects $aPrjName
-          lappend aProjectsInModule($aModule) $aPrjName
-          if {[file isdirectory $path/$theSrcDir/$aUnitLoc]} {
-            lappend aDependencies [LibToLinkX $aUnitLoc [file rootname $aSrcFile] $theSrcDir $theSourceDirOther]
-          } else {
-            lappend aDependencies {}
-          }
-        }
-      }
+      lappend aProjects $aUnit
+      lappend aProjectsInModule($aModule) $aUnit
+      lappend aDependencies [LibToLink $aUnit $theSrcDir $theSourceDirOther]
     }
   }
 }
@@ -1437,7 +1420,7 @@ proc osutils:csfList { theOS theCsfLibsMap theCsfFrmsMap theRelease} {
     set aLibsMap(CSF_FFmpeg) "avcodec avformat swscale avutil"
   }
   if { "$::HAVE_TBB" == "true" } {
-    set aLibsMap(CSF_TBB) "tbb12 tbbmalloc"
+    set aLibsMap(CSF_TBB) "tbb tbbmalloc"
   }
   if { "$::HAVE_VTK" == "true" } {
     if { "$theOS" == "wnt" } {
@@ -2110,98 +2093,106 @@ proc osutils:tk:execfiles { theFiles theOutDir theCommand thePrefix theExtension
 # Generate Visual Studio project file for executable
 proc osutils:vcprojx { theVcVer isUWP theOutDir theToolKit theGuidsMap theSrcDir theSourceDirOther } {
   set aVcFiles {}
-  foreach f [osutils:tk:cxxfiles $theToolKit wnt $theSrcDir] {
-    set aProjTmpl [osutils:vcproj:readtemplate $theVcVer $isUWP 1]
+  set aProjTmpl [osutils:vcproj:readtemplate $theVcVer $isUWP 1]
 
-    set aProjName [file rootname [file tail $f]]
-    set l_compilable [osutils:compilable wnt]
-    regsub -all -- {__XQTNAM__} $aProjTmpl $aProjName aProjTmpl
+  set aProjName $theToolKit
+  set l_compilable [osutils:compilable wnt]
+  regsub -all -- {__XQTNAM__} $aProjTmpl $aProjName aProjTmpl
 
-    upvar $theGuidsMap aGuidsMap
-    if { ! [info exists aGuidsMap($aProjName)] } {
-      set aGuidsMap($aProjName) [OS:genGUID]
-    }
-    regsub -all -- {__PROJECT_GUID__} $aProjTmpl $aGuidsMap($aProjName) aProjTmpl
+  upvar $theGuidsMap aGuidsMap
+  if { ! [info exists aGuidsMap($aProjName)] } {
+    set aGuidsMap($aProjName) [OS:genGUID]
+  }
+  regsub -all -- {__PROJECT_GUID__} $aProjTmpl $aGuidsMap($aProjName) aProjTmpl
 
-    set aUsedLibs [list]
-    foreach tkx [osutils:commonUsedTK  $theToolKit $theSrcDir $theSourceDirOther] {
-      lappend aUsedLibs "${tkx}.lib"
-    }
+  set aUsedLibs [list]
+  foreach tkx [osutils:commonUsedTK  $theToolKit $theSrcDir $theSourceDirOther] {
+    lappend aUsedLibs "${tkx}.lib"
+  }
 
-    set anOsReleaseLibs {}
-    set anOsDebugLibs {}
-    osutils:usedOsLibs $theToolKit "wnt" anOsReleaseLibs aFrameworks $theSrcDir true
-    osutils:usedOsLibs $theToolKit "wnt" anOsDebugLibs aFrameworks $theSrcDir false
+  set anOsReleaseLibs {}
+  set anOsDebugLibs {}
+  osutils:usedOsLibs $theToolKit "wnt" anOsReleaseLibs aFrameworks $theSrcDir true
+  osutils:usedOsLibs $theToolKit "wnt" anOsDebugLibs   aFrameworks $theSrcDir false
 
-    set aVCRTVer [string range $theVcVer 0 3]
-    regsub -all -- {__TKDEP__} $aProjTmpl [osutils:depLibraries $aUsedLibs $anOsReleaseLibs $theVcVer] aProjTmpl
-    regsub -all -- {__TKDEP_DEBUG__} $aProjTmpl [osutils:depLibraries $aUsedLibs $anOsDebugLibs $theVcVer] aProjTmpl
-    regsub -all -- {__TKDEFINES__} $aProjTmpl "" aProjTmpl
+  set aVCRTVer [string range $theVcVer 0 3]
+  regsub -all -- {__TKDEP__} $aProjTmpl [osutils:depLibraries $aUsedLibs $anOsReleaseLibs $theVcVer] aProjTmpl
+  regsub -all -- {__TKDEP_DEBUG__} $aProjTmpl [osutils:depLibraries $aUsedLibs $anOsDebugLibs $theVcVer] aProjTmpl
+  regsub -all -- {__TKDEFINES__} $aProjTmpl "" aProjTmpl
 
-    set aFilesSection ""
-    set aVcFilesCxx(units) ""
-	set aVcFilesHxx(units) ""
+  set aFilesSection ""
+  set aVcFilesCxx(units) ""
+  set aVcFilesHxx(units) ""
 
-    if { ![info exists written([file tail $f])] } {
-      set written([file tail $f]) 1
-
-      if { "$theVcVer" != "vc7" && "$theVcVer" != "vc8" && "$theVcVer" != "vc9" } {
+  if { "$theVcVer" != "vc7" && "$theVcVer" != "vc8" && "$theVcVer" != "vc9" } {
+    foreach f [osutils:tk:cxxfiles $theToolKit wnt $theSrcDir] {
+      if { ![info exists written([file tail $f])] } {
+        set written([file tail $f]) 1
         append aFilesSection [osutils:vcxproj:cxxfile $f "" 3]
         if { ! [info exists aVcFilesCxx($theToolKit)] } { lappend aVcFilesCxx(units) $theToolKit }
         lappend aVcFilesCxx($theToolKit) $f
       } else {
-        append aFilesSection "\t\t\t<Filter\n"
-        append aFilesSection "\t\t\t\tName=\"$theToolKit\"\n"
-        append aFilesSection "\t\t\t\t>\n"
-        append aFilesSection [osutils:vcproj:file $theVcVer $f ""]
-        append aFilesSection "\t\t\t</Filter>"
+        puts "Warning : in vcproj there are more than one occurrences for [file tail $f]"
       }
-    } else {
-      puts "Warning : in vcproj there are more than one occurrences for [file tail $f]"
     }
-    #puts "$aProjTmpl $aFilesSection"
-    set anIncPaths "..\\..\\..\\inc"
-    regsub -all -- {__TKINC__}  $aProjTmpl $anIncPaths    aProjTmpl
-    regsub -all -- {__FILES__}  $aProjTmpl $aFilesSection aProjTmpl
-    regsub -all -- {__CONF__}   $aProjTmpl Application    aProjTmpl
+  } else {
+    append aFilesSection "\t\t\t<Filter\n"
+    append aFilesSection "\t\t\t\tName=\"$theToolKit\"\n"
+    append aFilesSection "\t\t\t\t>\n"
+    foreach f [osutils:tk:cxxfiles $theToolKit wnt $theSrcDir] {
+      if { ![info exists written([file tail $f])] } {
+        set written([file tail $f]) 1
+        append aFilesSection [osutils:vcproj:file $theVcVer $f ""]
+      } else {
+        puts "Warning : in vcproj there are more than one occurrences for [file tail $f]"
+      }
+    }
+    append aFilesSection "\t\t\t</Filter>"
+  }
 
-    regsub -all -- {__XQTEXT__} $aProjTmpl "exe" aProjTmpl
+  #puts "$aProjTmpl $aFilesSection"
+  set anIncPaths "..\\..\\..\\inc"
+  regsub -all -- {__TKINC__}  $aProjTmpl $anIncPaths    aProjTmpl
+  regsub -all -- {__FILES__}  $aProjTmpl $aFilesSection aProjTmpl
+  regsub -all -- {__CONF__}   $aProjTmpl Application    aProjTmpl
 
-    set aFile [open [set aVcFilePath [file join $theOutDir ${aProjName}.[osutils:vcproj:ext $theVcVer]]] w]
+  regsub -all -- {__XQTEXT__} $aProjTmpl "exe" aProjTmpl
+
+  set aFile [open [set aVcFilePath [file join $theOutDir ${aProjName}.[osutils:vcproj:ext $theVcVer]]] w]
+  fconfigure $aFile -translation crlf
+  puts $aFile $aProjTmpl
+  close $aFile
+
+  set aCommonSettingsFile "$aVcFilePath.user"
+  lappend aVcFiles $aVcFilePath
+
+  # write filters file for vc10
+  if { "$theVcVer" != "vc7" && "$theVcVer" != "vc8" && "$theVcVer" != "vc9" } {
+    lappend aVcFiles [osutils:vcxproj:filters $theOutDir $aProjName aVcFilesCxx aVcFilesHxx]
+  }
+
+  # write resource file
+  lappend aVcFiles [osutils:readtemplate:rc $theOutDir $aProjName]
+
+  set aCommonSettingsFileTmpl ""
+  if { "$theVcVer" == "vc7" || "$theVcVer" == "vc8" } {
+    # nothing
+  } elseif { "$theVcVer" == "vc9" } {
+    set aCommonSettingsFileTmpl [wokUtils:FILES:FileToString "$::THE_CASROOT/adm/templates/vcproj.user.vc9x"]
+  } else {
+    set aCommonSettingsFileTmpl [wokUtils:FILES:FileToString "$::THE_CASROOT/adm/templates/vcxproj.user.vc10x"]
+  }
+  if { "$aCommonSettingsFileTmpl" != "" } {
+    regsub -all -- {__VCVER__} $aCommonSettingsFileTmpl $aVCRTVer aCommonSettingsFileTmpl
+
+    set aFile [open [set aVcFilePath "$aCommonSettingsFile"] w]
     fconfigure $aFile -translation crlf
-    puts $aFile $aProjTmpl
+    puts $aFile $aCommonSettingsFileTmpl
     close $aFile
 
-    set aCommonSettingsFile "$aVcFilePath.user"
-    lappend aVcFiles $aVcFilePath
-
-    # write filters file for vc10
-    if { "$theVcVer" != "vc7" && "$theVcVer" != "vc8" && "$theVcVer" != "vc9" } {
-      lappend aVcFiles [osutils:vcxproj:filters $theOutDir $aProjName aVcFilesCxx aVcFilesHxx]
-    }
-
-    # write resource file
-    lappend aVcFiles [osutils:readtemplate:rc $theOutDir $aProjName]
-
-    set aCommonSettingsFileTmpl ""
-    if { "$theVcVer" == "vc7" || "$theVcVer" == "vc8" } {
-      # nothing
-    } elseif { "$theVcVer" == "vc9" } {
-      set aCommonSettingsFileTmpl [wokUtils:FILES:FileToString "$::THE_CASROOT/adm/templates/vcproj.user.vc9x"]
-    } else {
-      set aCommonSettingsFileTmpl [wokUtils:FILES:FileToString "$::THE_CASROOT/adm/templates/vcxproj.user.vc10x"]
-    }
-    if { "$aCommonSettingsFileTmpl" != "" } {
-      regsub -all -- {__VCVER__} $aCommonSettingsFileTmpl $aVCRTVer aCommonSettingsFileTmpl
-
-      set aFile [open [set aVcFilePath "$aCommonSettingsFile"] w]
-      fconfigure $aFile -translation crlf
-      puts $aFile $aCommonSettingsFileTmpl
-      close $aFile
-
-      lappend aVcFiles "$aCommonSettingsFile"
-    }
+    lappend aVcFiles "$aCommonSettingsFile"
   }
+
   return $aVcFiles
 }
 

adm/qmake/OccToolkit.pri

@@ -23,7 +23,7 @@ CSF_TclLibs   = -ltcl8.6
 CSF_TclTkLibs = -ltk8.6
 HAVE_FREEIMAGE { CSF_FreeImagePlus = -lfreeimage } else:win32 { CSF_FreeImagePlus = -lwindowscodecs -lole32 }
 HAVE_FFMPEG    { CSF_FFmpeg = -lavcodec -lavformat -lswscale -lavutil }
-HAVE_TBB       { CSF_TBB = -ltbb12 -ltbbmalloc }
+HAVE_TBB       { CSF_TBB = -ltbb -ltbbmalloc }
 HAVE_ZLIB      { CSF_ZLIB = -lzlib }
 HAVE_LIBLZMA   { CSF_LIBLZMA = -lliblzma }
 HAVE_DRACO     { CSF_Draco = -ldraco }

adm/templates/custom.build.bat.in

@@ -11,7 +11,7 @@ if /I "%VCVER%" == "@COMPILER@" (
     set "FREEIMAGE_DIR=@3RDPARTY_FREEIMAGE_DLL_DIRS@"
     set "EGL_DIR=@3RDPARTY_EGL_DLL_DIRS@"
     set "GLES2_DIR=@3RDPARTY_GLES2_DLL_DIRS@"
-    set "TBB_DIR=@3RDPARTY_TBB12_DLL_DIR@"
+    set "TBB_DIR=@3RDPARTY_TBB_DLL_DIR@"
     set "VTK_DIR=@3RDPARTY_VTK_DLL_DIR@"
     set "FFMPEG_DIR=@3RDPARTY_FFMPEG_DLL_DIR@"
     set "OPENVR_DIR=@3RDPARTY_OPENVR_DLL_DIRS@"

adm/templates/custom.build.sh.in

@@ -9,7 +9,7 @@ if [ "$1" == "@BIN_LETTER@" ]; then
     export TK_DIR="@3RDPARTY_TK_LIBRARY_DIR@"
     export FREETYPE_DIR="@3RDPARTY_FREETYPE_LIBRARY_DIR@"
     export FREEIMAGE_DIR="@3RDPARTY_FREEIMAGE_LIBRARY_DIRS@"
-    export TBB_DIR="@3RDPARTY_TBB12_LIBRARY_DIR@"
+    export TBB_DIR="@3RDPARTY_TBB_LIBRARY_DIR@"
     export VTK_DIR="@3RDPARTY_VTK_LIBRARY_DIR@"
     export FFMPEG_DIR="@3RDPARTY_FFMPEG_LIBRARY_DIR@"
 

dox/introduction/introduction.md

@@ -341,7 +341,7 @@ The tables below describe the recommended software configurations for which OCCT
 
 | OS        | Compiler |
 | --------- | ----------- |
-| Windows   | Microsoft Visual Studio: 2013 Update 5, 2015 Update 3, 2017 <sup>1</sup>, 2019, 2022 <br>, LLVM (ClangCL), GCC 4.3+ (Mingw-w64)|
+| Windows   | Microsoft Visual Studio: 2015 Update 3, 2017 <sup>1</sup>, 2019, 2022 <br>, LLVM (ClangCL), GCC 4.3+ (Mingw-w64)|
 | Linux     | GNU gcc 4.3+ <br> LLVM CLang 3.6+ |
 | OS X / macOS | XCode 6 or newer |
 | Android   | NDK r12, GNU gcc 4.9 or newer |
@@ -572,8 +572,7 @@ FreeType 2 is released under two open-source licenses: BSD-like FreeType License
 It is a library that helps you to take advantage of multi-core processor performance without having to be a threading expert. 
 Threading Building Blocks is not just a threads-replacement library. It represents a higher-level, task-based parallelism that 
 abstracts platform details and threading mechanisms for scalability and performance. 
-oneTBB 2021.5.0 is available under Apache 2.0 license, while older versions
-until 4.4 are available under GPLv2 license with the runtime exception (https://www.threadingbuildingblocks.org).
+Intel oneTBB 2021.5.0 is available under Apache 2.0 license (https://www.threadingbuildingblocks.org).
 
 **OpenGL** is an industry standard API for 3D graphics used by OCCT for 
 implementation of 3D viewer. OpenGL specification is developed by the

dox/upgrade/upgrade.md

@@ -2338,3 +2338,8 @@ or to include system OpenGL headers in advance (with help of `OpenGl_GlNative.hx
 
 Method `StdPrs_ToolTriangulatedShape::Normal()` has been removed.
 Please use `BRepLib_ToolTriangulatedShape::ComputeNormals()` to fill in normal attributes in triangulation and fetch them directly using `Poly_Triangulation::Normal()`.
+
+@subsection upgrade_occt770_shapeproximity BRepExtrema_ShapeProximity
+
+A new way of using the `BRepExtrema_ShapeProximity` class was provided for computing a proximity value between two shapes.
+If at initialization of the `BRepExtrema_ShapeProximity` class the *theTolerance* parameter is not defined (Precision::Infinite() by default), the proximity value will be computed.

dox/user_guides/foundation_classes/foundation_classes.md

@@ -1331,7 +1331,7 @@ Therefore if the user of *NCollection* does not specify any allocator as a param
 Nevertheless, it is possible to define a custom *Allocator* type to manage the memory in the most optimal or convenient way for this algorithm.
 
 As one possible choice, the class *NCollection_IncAllocator* is included.
-Unlike *NCollection_BaseAllocator*, the memory is allocated in big blocks (about 20kB) and the allocator keeps track of the amount of occupied memory.
+Unlike *NCollection_BaseAllocator*, the memory is allocated in big blocks (about 12kB) and the allocator keeps track of the amount of occupied memory.
 The method *Allocate* just increments the pointer to non-occupied memory and returns its previous value.
 Memory is only released in the destructor of *NCollection_IncAllocator*, the method *Free* is empty.
 If used properly, this Allocator can greatly improve the performance of specific algorithms.

dox/user_guides/modeling_data/modeling_data.md

@@ -326,7 +326,8 @@ The <i>Geom2dConvert</i> package provides the following:
   * a global function which is used to construct a BSpline curve from a bounded curve based on a 2D curve from the Geom2d package,
   * a splitting algorithm which computes the points at which a 2D BSpline curve should be cut in order to obtain arcs with the same degree of continuity,
   * global functions used to construct the BSpline curves created by this splitting algorithm, or by other types of segmentation of the BSpline curve,
-  * an algorithm which converts a 2D BSpline curve into a series of adjacent Bezier curves.
+  * an algorithm which converts a 2D BSpline curve into a series of adjacent Bezier curves,
+  * an algorithm which converts an arbitrary 2D curve into a series of adjacent 2D circular arcs and 2D linear segments.
 
 The <i>GeomConvert</i> package also provides the following:
 

samples/CSharp/OCCTProxy/OCCTProxy.vcxproj

@@ -91,7 +91,6 @@
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <ConformanceMode>false</ConformanceMode>
     </ClCompile>
     <Link>
       <OutputFile>$(OutDir)OCCTProxy.dll</OutputFile>
@@ -122,7 +121,6 @@
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <ConformanceMode>false</ConformanceMode>
     </ClCompile>
     <Link>
       <OutputFile>$(OutDir)OCCTProxy.dll</OutputFile>
@@ -147,7 +145,6 @@
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <ConformanceMode>false</ConformanceMode>
     </ClCompile>
     <Link>
       <OutputFile>$(OutDir)OCCTProxy.dll</OutputFile>
@@ -175,7 +172,6 @@
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <ConformanceMode>false</ConformanceMode>
     </ClCompile>
     <Link>
       <OutputFile>$(OutDir)OCCTProxy.dll</OutputFile>

samples/CSharp/OCCTProxy_D3D/OCCTProxy_D3D.vcxproj

@@ -92,7 +92,6 @@
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <ConformanceMode>false</ConformanceMode>
     </ClCompile>
     <Link>
       <OutputFile>$(OutDir)OCCTProxy_D3D.dll</OutputFile>
@@ -124,7 +123,6 @@
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <ConformanceMode>false</ConformanceMode>
     </ClCompile>
     <Link>
       <OutputFile>$(OutDir)OCCTProxy_D3D.dll</OutputFile>
@@ -149,7 +147,6 @@
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <ConformanceMode>false</ConformanceMode>
     </ClCompile>
     <Link>
       <OutputFile>$(OutDir)OCCTProxy_D3D.dll</OutputFile>
@@ -177,7 +174,6 @@
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
-      <ConformanceMode>false</ConformanceMode>
     </ClCompile>
     <Link>
       <OutputFile>$(OutDir)OCCTProxy_D3D.dll</OutputFile>

samples/qt/IESample/IESample.pro

@@ -51,7 +51,7 @@ unix {
     DEFINES += OCC_CONVERT_SIGNALS QT_NO_STL
     !macx | equals(MACOSX_USE_GLX, true): LIBS += -L$$QMAKE_LIBDIR_X11 $$QMAKE_LIBS_X11 -L$$QMAKE_LIBDIR_OPENGL $$QMAKE_LIBS_OPENGL $$QMAKE_LIBS_THREAD
     LIBS += -lfreeimageplus
-    LIBS += -ltbb12 -ltbbmalloc
+    LIBS += -ltbb -ltbbmalloc
     QMAKE_CXXFLAGS += -std=gnu++11
 }
 

samples/qt/Interface/src/Translate.cxx

@@ -221,7 +221,7 @@ Handle(TopTools_HSequenceOfShape) Translate::importModel( const int format, cons
             shapes = importSTEP( file );
             break;
         }
-    } catch ( Standard_Failure ) {
+    } catch ( const Standard_Failure& ) {
         shapes.Nullify();
     }
     return shapes;
@@ -256,7 +256,7 @@ bool Translate::exportModel( const int format, const QString& file, const Handle
         case FormatSTL:  return exportSTL ( file, shapes );
         case FormatVRML: return exportVRML( file, shapes );
         }
-    } catch ( Standard_Failure ) {
+    } catch ( const Standard_Failure& ) {
         //
     }
     return false;
@@ -528,26 +528,26 @@ bool Translate::exportSTL( const QString& file, const Handle(TopTools_HSequenceO
     if ( shapes.IsNull() || shapes->IsEmpty() )
         return false;
 
-	TopoDS_Compound res;
-	BRep_Builder builder;
-	builder.MakeCompound( res );
+    TopoDS_Compound res;
+    BRep_Builder builder;
+    builder.MakeCompound( res );
 
-	for ( int i = 1; i <= shapes->Length(); i++ )
-	{
-		TopoDS_Shape shape = shapes->Value( i );
-		if ( shape.IsNull() ) 
-		{
-			myInfo = QObject::tr( "INF_TRANSLATE_ERROR_INVALIDSHAPE" );
-			return false;
+    for ( int i = 1; i <= shapes->Length(); i++ )
+    {
+        TopoDS_Shape shape = shapes->Value( i );
+        if ( shape.IsNull() ) 
+        {
+            myInfo = QObject::tr( "INF_TRANSLATE_ERROR_INVALIDSHAPE" );
+            return false;
         }
-		builder.Add( res, shape );
-	}
+        builder.Add( res, shape );
+    }
 
-	StlAPI_Writer writer;
-	
-	const TCollection_AsciiString anUtf8Path (file.toUtf8().data());
-	
-	writer.Write( res, anUtf8Path.ToCString() );
+    StlAPI_Writer writer;
+
+    const TCollection_AsciiString anUtf8Path (file.toUtf8().data());
+
+    writer.Write( res, anUtf8Path.ToCString() );
 
     return true;
 }
@@ -557,26 +557,26 @@ bool Translate::exportVRML( const QString& file, const Handle(TopTools_HSequence
     if ( shapes.IsNull() || shapes->IsEmpty() )
         return false;
 
-	TopoDS_Compound res;
-	BRep_Builder builder;
-	builder.MakeCompound( res );
+    TopoDS_Compound res;
+    BRep_Builder builder;
+    builder.MakeCompound( res );
 
-	for ( int i = 1; i <= shapes->Length(); i++ )
-	{
-		TopoDS_Shape shape = shapes->Value( i );
-		if ( shape.IsNull() )
-		{
-			myInfo = QObject::tr( "INF_TRANSLATE_ERROR_INVALIDSHAPE" );
-			return false;
+    for ( int i = 1; i <= shapes->Length(); i++ )
+    {
+        TopoDS_Shape shape = shapes->Value( i );
+        if ( shape.IsNull() )
+        {
+            myInfo = QObject::tr( "INF_TRANSLATE_ERROR_INVALIDSHAPE" );
+            return false;
         }
-		builder.Add( res, shape );
-	}
+    builder.Add( res, shape );
+    }
 
-	VrmlAPI_Writer writer;
-	
-	const TCollection_AsciiString anUtf8Path (file.toUtf8().data());
-	
-	writer.Write( res, anUtf8Path.ToCString() );
+    VrmlAPI_Writer writer;
+
+    const TCollection_AsciiString anUtf8Path (file.toUtf8().data());
+
+    writer.Write( res, anUtf8Path.ToCString() );
 
     return true;
 }

src/AIS/AIS_Animation.cxx

@@ -251,7 +251,9 @@ void AIS_Animation::Stop()
   myState = AnimationState_Stopped;
   if (!myTimer.IsNull())
   {
+    const Standard_Real anElapsedTime = ElapsedTime();
     myTimer->Stop();
+    myTimer->Seek (Min (Duration(), anElapsedTime));
   }
 
   for (NCollection_Sequence<Handle(AIS_Animation)>::Iterator anIter (myAnimations); anIter.More(); anIter.Next())

src/AIS/AIS_InteractiveContext.cxx

@@ -1,4 +1,4 @@
-// Created on: 1997-01-17
+// Created on: 1997-01-17
 // Created by: Robert COUBLANC
 // Copyright (c) 1997-1999 Matra Datavision
 // Copyright (c) 1999-2014 OPEN CASCADE SAS
@@ -1001,6 +1001,14 @@ void AIS_InteractiveContext::RecomputeSelectionOnly (const Handle(AIS_Interactiv
     return;
   }
 
+  TColStd_ListOfInteger aModes;
+  ActivatedModes (theIO, aModes);
+
+  for (TColStd_ListIteratorOfListOfInteger aModesIter (aModes); aModesIter.More(); aModesIter.Next())
+  {
+    mgrSelector->Deactivate (theIO, aModesIter.Value());
+  }
+
   mgrSelector->RecomputeSelection (theIO);
 
   const Handle(AIS_GlobalStatus)* aStatus = myObjects.Seek (theIO);
@@ -1010,10 +1018,7 @@ void AIS_InteractiveContext::RecomputeSelectionOnly (const Handle(AIS_Interactiv
     return;
   }
 
-  TColStd_ListOfInteger aModes;
-  ActivatedModes (theIO, aModes);
-  TColStd_ListIteratorOfListOfInteger aModesIter (aModes);
-  for (; aModesIter.More(); aModesIter.Next())
+  for (TColStd_ListIteratorOfListOfInteger aModesIter (aModes); aModesIter.More(); aModesIter.Next())
   {
     mgrSelector->Activate (theIO, aModesIter.Value());
   }

src/BRepAlgo/BRepAlgo.cxx

@@ -15,8 +15,13 @@
 // commercial license or contractual agreement.
 
 
+#include <BRep_Builder.hxx>
 #include <BRep_Tool.hxx>
+#include <BRepBuilderAPI_MakeEdge.hxx>
+#include <BRepBuilderAPI_MakeFace.hxx>
+#include <BRepBuilderAPI_MakeWire.hxx>
 #include <BRepAdaptor_Curve.hxx>
+#include <BRepAdaptor_Curve2d.hxx>
 #include <BRepAlgo.hxx>
 #include <BRepLib.hxx>
 #include <BRepLib_MakeEdge.hxx>
@@ -25,10 +30,13 @@
 #include <ElCLib.hxx>
 #include <Geom_Curve.hxx>
 #include <Geom_TrimmedCurve.hxx>
+#include <Geom2d_TrimmedCurve.hxx>
+#include <Geom2dConvert_ApproxArcsSegments.hxx>
 #include <GeomAbs_CurveType.hxx>
 #include <GeomConvert.hxx>
 #include <GeomConvert_CompCurveToBSplineCurve.hxx>
 #include <GeomLProp.hxx>
+#include <NCollection_Vector.hxx>
 #include <gp_Pnt.hxx>
 #include <Precision.hxx>
 #include <ShapeFix_Shape.hxx>
@@ -40,6 +48,7 @@
 #include <TColStd_SequenceOfBoolean.hxx>
 #include <TColStd_SequenceOfReal.hxx>
 #include <TopExp.hxx>
+#include <TopExp_Explorer.hxx>
 #include <TopLoc_Location.hxx>
 #include <TopoDS.hxx>
 #include <TopoDS_Edge.hxx>
@@ -47,6 +56,166 @@
 #include <TopoDS_Vertex.hxx>
 #include <TopoDS_Wire.hxx>
 
+// The minimal tolerance of approximation (edges can be defined with yet smaller tolerance)
+static const Standard_Real MINIMAL_TOLERANCE = 0.0001;
+
+namespace {
+
+struct OrientedCurve
+{
+  Handle(Geom2d_TrimmedCurve) Curve;
+  Standard_Boolean           IsReverse;
+  inline gp_Pnt2d Point (const Standard_Boolean isEnd) const
+  {
+    if (isEnd == IsReverse)
+      return Curve->StartPoint();
+    return Curve->EndPoint();
+  }  
+};
+
+}
+
+//=======================================================================
+//function : ConvertWire
+//purpose  : 
+//=======================================================================
+
+TopoDS_Wire BRepAlgo::ConvertWire(const TopoDS_Wire&          theWire,
+                                  const Standard_Real         theAngleTol,
+                                  const TopoDS_Face&          theFace)
+{
+  TopoDS_Wire aResult;
+  Standard_Real aMaxTol(0.);
+  const Handle(Geom_Surface) aSurf = BRep_Tool::Surface(theFace);
+  NCollection_Vector<OrientedCurve> vecCurve;
+
+  BRepTools_WireExplorer anExpE(theWire, theFace);
+  // Explore the edges in the current wire, in their connection order
+  for (; anExpE.More(); anExpE.Next()) {
+    const TopoDS_Edge& anEdge = anExpE.Current();
+    BRepAdaptor_Curve2d aCurve(anEdge, theFace);
+    Standard_Real aTol = BRep_Tool::Tolerance(anEdge);
+    if (aTol < MINIMAL_TOLERANCE)
+      aTol = MINIMAL_TOLERANCE;
+    if (aTol > aMaxTol)
+      aMaxTol = aTol;
+    Geom2dConvert_ApproxArcsSegments anAlgo(aCurve, aTol, theAngleTol);
+    const TColGeom2d_SequenceOfCurve& aResultApprox = anAlgo.GetResult();
+
+    // Form the array of approximated elementary curves
+    if (anEdge.Orientation() == TopAbs_REVERSED) {
+      for (Standard_Integer iCrv = aResultApprox.Length(); iCrv > 0 ; iCrv--) {
+        const Handle(Geom2d_Curve)& aCrv = aResultApprox(iCrv);
+        if (aCrv.IsNull() == Standard_False) {
+          OrientedCurve& anOCurve = vecCurve.Append(OrientedCurve());
+          anOCurve.Curve = Handle(Geom2d_TrimmedCurve)::DownCast(aCrv);
+          anOCurve.IsReverse = Standard_True;
+        }
+      }
+    } else {
+      for (Standard_Integer iCrv = 1; iCrv <= aResultApprox.Length(); iCrv++) {
+        const Handle(Geom2d_Curve)& aCrv = aResultApprox(iCrv);
+        if (aCrv.IsNull() == Standard_False) {
+          OrientedCurve& anOCurve = vecCurve.Append(OrientedCurve());
+          anOCurve.Curve = Handle(Geom2d_TrimmedCurve)::DownCast(aCrv);
+          anOCurve.IsReverse = Standard_False;
+        }
+      }
+    }
+  }
+
+  if (vecCurve.Length() > 0)
+  {
+    // Build the first vertex
+    BRep_Builder aVBuilder;
+    gp_Pnt2d aPnt[2] = {
+      vecCurve(0).Point(Standard_False),
+      vecCurve(vecCurve.Length() - 1).Point(Standard_True)
+    };
+    Standard_Real aDist = aPnt[0].Distance(aPnt[1]);
+    if (aDist > aMaxTol + Precision::Confusion())
+      aDist = Precision::Confusion();
+    else {
+      aDist = 0.5 * aDist + Precision::Confusion();
+      aPnt[0] = 0.5 * (aPnt[0].XY() + aPnt[1].XY());
+    }
+    gp_Pnt aPnt3d;
+    aSurf->D0(aPnt[0].X(), aPnt[0].Y(), aPnt3d);
+    TopoDS_Vertex aFirstVertex;
+    aVBuilder.MakeVertex(aFirstVertex, aPnt3d, aDist);
+
+    // Loop creating edges
+    BRepBuilderAPI_MakeWire aMkWire;
+    TopoDS_Edge anEdgeRes;
+    TopoDS_Vertex aVertex = aFirstVertex;
+    for (Standard_Integer iCrv = 0; iCrv < vecCurve.Length(); iCrv++) {
+      const OrientedCurve& anOCurve = vecCurve(iCrv);
+      TopoDS_Vertex aNextVertex;
+      aPnt[0] = anOCurve.Point(Standard_True);
+      if (iCrv == vecCurve.Length() - 1) {
+        aPnt[1] = vecCurve(0).Point(Standard_False);
+        aDist = aPnt[0].Distance(aPnt[1]);
+        if (aDist > aMaxTol + Precision::Confusion()) {
+          aSurf->D0(aPnt[0].X(), aPnt[0].Y(), aPnt3d);
+          aVBuilder.MakeVertex(aNextVertex, aPnt3d, Precision::Confusion());
+        } else {
+          aNextVertex = aFirstVertex;
+        }
+      } else {
+        aPnt[1] = vecCurve(iCrv + 1).Point(Standard_False);
+        aDist = 0.5 * (aPnt[0].Distance(aPnt[1])) + Precision::Confusion();
+        aPnt[0] = 0.5 * (aPnt[0].XY() + aPnt[1].XY());
+        aSurf->D0(aPnt[0].X(), aPnt[0].Y(), aPnt3d);
+        aVBuilder.MakeVertex(aNextVertex, aPnt3d, aDist);
+      }
+      const Standard_Real aParam[2] = {
+        anOCurve.Curve->FirstParameter(),
+        anOCurve.Curve->LastParameter()
+      };
+      if (anOCurve.IsReverse) {
+        BRepBuilderAPI_MakeEdge aMkEdge(anOCurve.Curve, aSurf, aNextVertex,
+                                        aVertex, aParam[0], aParam[1]);
+        anEdgeRes = aMkEdge.Edge();
+        anEdgeRes.Orientation(TopAbs_REVERSED);
+      } else {
+        BRepBuilderAPI_MakeEdge aMkEdge(anOCurve.Curve, aSurf, aVertex,
+                                        aNextVertex, aParam[0], aParam[1]);
+        anEdgeRes = aMkEdge.Edge();
+      }
+      aVertex = aNextVertex;
+      aMkWire.Add(anEdgeRes);
+    }
+
+    if (aMkWire.IsDone())
+      aResult = aMkWire.Wire();
+  }
+  return aResult;
+}
+
+//=======================================================================
+//function : ConvertFace
+//purpose  : 
+//=======================================================================
+
+TopoDS_Face BRepAlgo::ConvertFace (const TopoDS_Face&  theFace,
+                                   const Standard_Real theAngleTolerance)
+{
+  TopoDS_Face aResult;
+  const Handle(Geom_Surface) aSurf = BRep_Tool::Surface(theFace);
+  BRepBuilderAPI_MakeFace aMkFace(aSurf,Precision::Confusion());
+
+  TopExp_Explorer anExp(theFace, TopAbs_WIRE);
+  for (; anExp.More(); anExp.Next()) {
+    const TopoDS_Wire& aWire = TopoDS::Wire(anExp.Current());
+    const TopoDS_Wire aNewWire = ConvertWire(aWire, theAngleTolerance, theFace);
+    aMkFace.Add(aNewWire);
+  }
+  if (aMkFace.IsDone()) {
+    aResult = aMkFace.Face();
+  }
+  return aResult;
+}
+
 //=======================================================================
 //function : ConcatenateWire
 //purpose  : 

src/BRepAlgo/BRepAlgo.hxx

@@ -21,6 +21,7 @@
 #include <TopTools_ListOfShape.hxx>
 class TopoDS_Wire;
 class TopoDS_Edge;
+class TopoDS_Face;
 class TopoDS_Shape;
 
 
@@ -43,6 +44,28 @@ public:
   //! Junction points between edges of wire may be sharp,
   //! resulting curve of the resulting edge may be C0.
   Standard_EXPORT static TopoDS_Edge ConcatenateWireC0 (const TopoDS_Wire& Wire);
+
+  //! Method of wire conversion, calls BRepAlgo_Approx internally.
+  //! @param theWire
+  //!   Input Wire object.
+  //! @param theAngleTolerance
+  //!   Angle (in radians) defining the continuity of the wire: if two vectors
+  //!   differ by less than this angle, the result will be smooth (zero angle of
+  //!   tangent lines between curve elements).
+  //! @return
+  //!   The new TopoDS_Wire object consisting of edges each representing an arc
+  //!   of circle or a linear segment. The accuracy of conversion is defined
+  //!   as the maximal tolerance of edges in theWire.
+  static Standard_EXPORT TopoDS_Wire ConvertWire
+                                (const TopoDS_Wire&  theWire,
+                                 const Standard_Real theAngleTolerance,
+                                 const TopoDS_Face&  theFace);
+
+  //! Method of face conversion. The API corresponds to the method ConvertWire.
+  //! This is a shortcut for calling ConvertWire() for each wire in theFace.
+  static Standard_EXPORT TopoDS_Face ConvertFace
+                                (const TopoDS_Face&  theFace,
+                                 const Standard_Real theAngleTolerance);
   
   //! Checks if the  shape is "correct". If not, returns
   //! <Standard_False>, else returns <Standard_True>.

src/BRepAlgo/BRepAlgo_Loop.cxx

@@ -42,12 +42,14 @@
 #include <TopTools_SequenceOfShape.hxx>
 
 #include <stdio.h>
+//#define OCCT_DEBUG_ALGO
+//#define DRAW
 #ifdef DRAW
 #include <DBRep.hxx>
 #pragma comment(lib,"TKDraw")
 #endif
 #ifdef OCCT_DEBUG_ALGO
-Standard_Boolean AffichLoop  = Standard_False;
+Standard_Boolean AffichLoop  = Standard_True;
 Standard_Integer NbLoops     = 0;
 Standard_Integer NbWires     = 1;
 static char* name = new char[100];
@@ -58,7 +60,8 @@ static char* name = new char[100];
 //purpose  : 
 //=======================================================================
 
-BRepAlgo_Loop::BRepAlgo_Loop()
+BRepAlgo_Loop::BRepAlgo_Loop():
+  myTolConf (0.001)
 {
 }
 
@@ -185,7 +188,6 @@ static TopoDS_Vertex  UpdateClosedEdge(const TopoDS_Edge&         E,
   Standard_Boolean OnStart = 0, OnEnd = 0;
   //// modified by jgv, 13.04.04 for OCC5634 ////
   TopExp::Vertices (E,V1,V2);
-  //Standard_Real    Tol = Precision::Confusion();
   Standard_Real    Tol = BRep_Tool::Tolerance( V1 );
   ///////////////////////////////////////////////
   
@@ -427,13 +429,12 @@ static void StoreInMVE (const TopoDS_Face&                  F,
 			TopoDS_Edge&                  E,
 			TopTools_IndexedDataMapOfShapeListOfShape& MVE,
 			Standard_Boolean&                   YaCouture,
-			TopTools_DataMapOfShapeShape& VerticesForSubstitute )
+			TopTools_DataMapOfShapeShape& VerticesForSubstitute,
+            const Standard_Real theTolConf)
 {      
   TopoDS_Vertex V1, V2, V;
   TopTools_ListOfShape Empty;
   
-  Standard_Real Tol = 0.001; //5.e-05; //5.e-07;
-//  gp_Pnt P1, P2, P;
   gp_Pnt P1, P;
   BRep_Builder BB;
   for (Standard_Integer iV = 1; iV <= MVE.Extent(); iV++)
@@ -449,7 +450,7 @@ static void StoreInMVE (const TopoDS_Face&                  F,
 	{
 	  V1 = TopoDS::Vertex( itl.Value() );
 	  P1 = BRep_Tool::Pnt( V1 );
-	  if (P.IsEqual( P1, Tol ) && !V.IsSame(V1))
+	  if (P.IsEqual( P1, theTolConf ) && !V.IsSame(V1))
 	    {
 	      V.Orientation( V1.Orientation() );
 	      if (VerticesForSubstitute.IsBound( V1 ))
@@ -574,7 +575,7 @@ void BRepAlgo_Loop::Perform()
         TopoDS_Edge& E = TopoDS::Edge(itl1.Value());
         if (!Emap.Add(E))
           continue;
-        StoreInMVE(myFace,E,MVE,YaCouture,myVerticesForSubstitute);
+        StoreInMVE(myFace,E,MVE,YaCouture,myVerticesForSubstitute, myTolConf);
       }
     }
   }
@@ -586,7 +587,7 @@ void BRepAlgo_Loop::Perform()
   for (itl.Initialize(myConstEdges); itl.More(); itl.Next()) {
     TopoDS_Edge& E = TopoDS::Edge(itl.Value());
     if (DejaVu.Add(E))
-      StoreInMVE(myFace,E,MVE,YaCouture,myVerticesForSubstitute);
+      StoreInMVE(myFace,E,MVE,YaCouture,myVerticesForSubstitute, myTolConf);
   }
 
 #ifdef DRAW
@@ -626,42 +627,42 @@ void BRepAlgo_Loop::Perform()
     //--------------------------------
     RemovePendingEdges(MVE);
 
-    if (MVE.Extent() == 0) break; 
+    if (MVE.Extent() == 0) break;
     //--------------------------------
     // Start edge.
     //--------------------------------
     EF = CE = TopoDS::Edge(MVE(1).First());
-    TopExp::Vertices(CE,V1,V2);
+    TopExp::Vertices(CE, V1, V2);
     //--------------------------------
     // VF vertex start of new wire
     //--------------------------------
-    if (CE.Orientation() == TopAbs_FORWARD) { CV = VF = V1;}
-    else                                    { CV = VF = V2;}
+    if (CE.Orientation() == TopAbs_FORWARD) { CV = VF = V1; }
+    else { CV = VF = V2; }
     if (!MVE.Contains(CV)) continue;
     TopTools_ListOfShape& aListEdges = MVE.ChangeFromKey(CV);
-    for ( itl.Initialize(aListEdges); itl.More(); itl.Next()) {
+    for (itl.Initialize(aListEdges); itl.More(); itl.Next()) {
       if (itl.Value().IsEqual(CE)) {
-	aListEdges.Remove(itl);
-	break;
+        aListEdges.Remove(itl);
+        break;
       }
     }
-    End  = Standard_False;
-    
+    End = Standard_False;
+
     while (!End) {
       //-------------------------------
       // Construction of a wire.
       //-------------------------------
-      TopExp::Vertices(CE,V1,V2);
+      TopExp::Vertices(CE, V1, V2);
       if (!CV.IsSame(V1)) CV = V1; else CV = V2;
 
-      B.Add (NW,CE);
+      B.Add(NW, CE);
       UsedEdges.Add(CE);
 
       if (!MVE.Contains(CV) || MVE.FindFromKey(CV).IsEmpty()) {
         End = Standard_True;
       }
       else {
-        End = !SelectEdge(myFace,CE,CV,NE,MVE.ChangeFromKey(CV));
+        End = !SelectEdge(myFace, CE, CV, NE, MVE.ChangeFromKey(CV));
         if (!End) {
           CE = NE;
           if (MVE.FindFromKey(CV).IsEmpty())
@@ -672,35 +673,41 @@ void BRepAlgo_Loop::Perform()
     //--------------------------------------------------
     // Add new wire to the set of wires
     //------------------------------------------------
-    Standard_Real Tol = 0.001; //5.e-05; //5.e-07;
-    TopExp_Explorer explo( NW, TopAbs_VERTEX );
-    for (; explo.More(); explo.Next())
-      {
-      const TopoDS_Vertex& aV = TopoDS::Vertex( explo.Current() );
-      Handle(BRep_TVertex)& TV = *((Handle(BRep_TVertex)*) &(aV).TShape());
-      TV->Tolerance( Tol );
-      TV->Modified( Standard_True );
-      }
-    for (explo.Init( NW, TopAbs_EDGE ); explo.More(); explo.Next())
-      {
-      const TopoDS_Edge& aE = TopoDS::Edge( explo.Current() );
-      Handle(BRep_TEdge)& TE = *((Handle(BRep_TEdge)*) &(aE).TShape());
-      TE->Tolerance( Tol );
-      TE->Modified( Standard_True );
-      }
 
-    if (VF.IsSame(CV) && SamePnt2d(VF,EF,CE,myFace))
+    if (VF.IsSame(CV))
     {
-      NW.Closed (Standard_True);
-      myNewWires.Append (NW);
+      if (SamePnt2d(VF, EF, CE, myFace))
+      {
+        NW.Closed(Standard_True);
+        myNewWires.Append(NW);
+      }
+      else if(BRep_Tool::Tolerance(VF) < myTolConf)
+      {
+        BRep_Builder aBB;
+        aBB.UpdateVertex(VF, myTolConf);
+        if (SamePnt2d(VF, EF, CE, myFace))
+        {
+          NW.Closed(Standard_True);
+          myNewWires.Append(NW);
+        }
+#ifdef OCCT_DEBUG_ALGO
+        else
+        {
+          std::cout << "BRepAlgo_Loop: Open Wire" << std::endl;
+          if (AffichLoop)
+            std::cout << "OpenWire is : NW_" << NbLoops << "_" << NbWires << std::endl;
+        }
+#endif
+      }
     }
 #ifdef OCCT_DEBUG_ALGO
     else {
-      std::cout <<"BRepAlgo_Loop: Open Wire"<<std::endl;
+      std::cout << "BRepAlgo_Loop: Open Wire" << std::endl;
       if (AffichLoop)
-        std::cout << "OpenWire is : NW_"<<NbLoops<<"_"<<NbWires<<std::endl;
-      }
+        std::cout << "OpenWire is : NW_" << NbLoops << "_" << NbWires << std::endl;
+    }
 #endif
+
 #ifdef DRAW
     if (AffichLoop) {
       sprintf(name,"NW_%d_%d",NbLoops,NbWires++);	
@@ -777,8 +784,6 @@ void BRepAlgo_Loop::CutEdge (const TopoDS_Edge&          E,
       VF = TopoDS::Vertex(aLocalV);
       aLocalV = VCEI.Oriented(TopAbs_REVERSED); 
       VL = TopoDS::Vertex(aLocalV);
-//      VF = TopoDS::Vertex(VCEI.Oriented(TopAbs_FORWARD));
-//      VL = TopoDS::Vertex(VCEI.Oriented(TopAbs_REVERSED)); 
     }
     SV.Prepend(VF);
     SV.Append(VL);
@@ -813,13 +818,9 @@ void BRepAlgo_Loop::CutEdge (const TopoDS_Edge&          E,
       B.Add  (NewEdge,aLocalEdge);
       aLocalEdge = V2.Oriented(TopAbs_REVERSED);
       B.Add  (TopoDS::Edge(NewEdge),aLocalEdge);
-//      B.Add  (NewEdge,V1.Oriented(TopAbs_FORWARD));
-//      B.Add  (NewEdge,V2.Oriented(TopAbs_REVERSED));
       if (V1.IsSame(VF)) 
 	U1 = f;
       else 
-//	U1=BRep_Tool::Parameter
-//	  (TopoDS::Vertex(V1.Oriented(TopAbs_INTERNAL)),WE);
 	{
 	  TopoDS_Shape aLocalV = V1.Oriented(TopAbs_INTERNAL);
 	  U1=BRep_Tool::Parameter(TopoDS::Vertex(aLocalV),WE);
@@ -830,8 +831,6 @@ void BRepAlgo_Loop::CutEdge (const TopoDS_Edge&          E,
 	{
 	  TopoDS_Shape aLocalV = V2.Oriented(TopAbs_INTERNAL);
 	  U2=BRep_Tool::Parameter(TopoDS::Vertex(aLocalV),WE);
-//	U2=BRep_Tool::Parameter
-//	  (TopoDS::Vertex(V2.Oriented(TopAbs_INTERNAL)),WE);
 	}
       B.Range (TopoDS::Edge(NewEdge),U1,U2);
 #ifdef DRAW

src/BRepAlgo/BRepAlgo_Loop.hxx

@@ -86,8 +86,17 @@ public:
   
   Standard_EXPORT void VerticesForSubstitute (TopTools_DataMapOfShapeShape& VerVerMap);
 
+  //! Set maximal tolerance used for comparing distaces between vertices. 
+  void SetTolConf(const Standard_Real theTolConf)
+  {
+    myTolConf = theTolConf;
+  }
 
-
+  //! Get maximal tolerance used for comparing distaces between vertices. 
+  Standard_Real GetTolConf() const
+  {
+    return myTolConf;
+  }
 
 protected:
 
@@ -108,6 +117,7 @@ private:
   TopTools_DataMapOfShapeListOfShape myCutEdges;
   TopTools_DataMapOfShapeShape myVerticesForSubstitute;
   BRepAlgo_Image myImageVV;
+  Standard_Real myTolConf;
 
 
 };

src/BRepBlend/BRepBlend_CSWalking.hxx

@@ -51,7 +51,7 @@ public:
   
   Standard_EXPORT BRepBlend_CSWalking(const Handle(Adaptor3d_Curve)& Curv, const Handle(Adaptor3d_Surface)& Surf, const Handle(Adaptor3d_TopolTool)& Domain);
   
-  Standard_EXPORT void Perform (Blend_CSFunction& F, const Standard_Real Pdep, const Standard_Real Pmax, const Standard_Real MaxStep, const Standard_Real TolGuide, const math_Vector& Soldep, const Standard_Real Tolesp, const Standard_Real Fleche, const Standard_Boolean Appro = Standard_False);
+  Standard_EXPORT void Perform (Blend_CSFunction& F, const Standard_Real Pdep, const Standard_Real Pmax, const Standard_Real MaxStep, const Standard_Real Tol3d, const Standard_Real TolGuide, const math_Vector& Soldep, const Standard_Real Fleche, const Standard_Boolean Appro = Standard_False);
   
   Standard_EXPORT Standard_Boolean Complete (Blend_CSFunction& F, const Standard_Real Pmin);
   
@@ -80,7 +80,7 @@ private:
   Handle(Adaptor3d_Surface) surf;
   Handle(Adaptor3d_Curve) curv;
   Handle(Adaptor3d_TopolTool) domain;
-  Standard_Real tolesp;
+  Standard_Real tolpoint3d;
   Standard_Real tolgui;
   Standard_Real pasmax;
   Standard_Real fleche;

src/BRepBlend/BRepBlend_RstRstLineBuilder.cxx

@@ -173,7 +173,7 @@ BRepBlend_RstRstLineBuilder::BRepBlend_RstRstLineBuilder
  done(Standard_False), sol(1, 2), surf1(Surf1),
  domain1(Domain1), surf2(Surf2),
  domain2(Domain2), rst1(Rst1), rst2(Rst2),
- tolesp(0.0), tolgui(0.0), pasmax(0.0),
+ tolpoint3d(0.0), tolgui(0.0), pasmax(0.0),
  fleche(0.0), param(0.0), rebrou(Standard_False),
  iscomplete(Standard_False), comptra(Standard_False), sens(0.0),
  decrochdeb(Blend_NoDecroch), decrochfin(Blend_NoDecroch)
@@ -193,9 +193,9 @@ void BRepBlend_RstRstLineBuilder::Perform(Blend_RstRstFunction&   Func,
 					  const Standard_Real     Pdep,
 					  const Standard_Real     Pmax,
 					  const Standard_Real     MaxStep,
+            const Standard_Real     Tol3d,
 					  const Standard_Real     TolGuide,
 					  const math_Vector&      ParDep,
-					  const Standard_Real     Tolesp,
 					  const Standard_Real     Fleche,
 					  const Standard_Boolean  Appro) 
 {
@@ -203,7 +203,7 @@ void BRepBlend_RstRstLineBuilder::Perform(Blend_RstRstFunction&   Func,
   iscomplete = Standard_False;
   comptra    = Standard_False;
   line       = new BRepBlend_Line();
-  tolesp     = Abs(Tolesp);
+  tolpoint3d   = Tol3d;
   tolgui     = Abs(TolGuide);
   fleche     = Abs(Fleche);
   rebrou     = Standard_False;
@@ -225,7 +225,7 @@ void BRepBlend_RstRstLineBuilder::Perform(Blend_RstRstFunction&   Func,
     TopAbs_State siturst1, siturst2;
     Blend_DecrochStatus decroch;
     math_Vector tolerance(1, 2), infbound(1, 2), supbound(1, 2);
-    Func.GetTolerance(tolerance, tolesp);
+    Func.GetTolerance(tolerance, tolpoint3d);
     Func.GetBounds(infbound, supbound);
     math_FunctionSetRoot rsnld(Func, tolerance, 30);
     
@@ -258,9 +258,9 @@ void BRepBlend_RstRstLineBuilder::Perform(Blend_RstRstFunction&   Func,
   U = previousP.ParameterOnC1();
   V = previousP.ParameterOnC2();
   BRepBlend_Extremity ptf1 (previousP.PointOnC1(),
-			    U, previousP.Parameter(),tolesp);
+			    U, previousP.Parameter(),tolpoint3d);
   BRepBlend_Extremity ptf2 (previousP.PointOnC2(),
-			    V, previousP.Parameter(),tolesp);
+			    V, previousP.Parameter(),tolpoint3d);
   if (!previousP.IsTangencyPoint()) {
     ptf1.SetTangent(previousP.TangentOnC1());
     ptf2.SetTangent(previousP.TangentOnC2());
@@ -291,7 +291,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::PerformFirstSection
  const Standard_Real     Pdep,
  const Standard_Real     Pmax,
  const math_Vector&      ParDep,
- const Standard_Real     Tolesp,
+ const Standard_Real     Tol3d,
  const Standard_Real     TolGuide,
  const Standard_Boolean  RecRst1,
  const Standard_Boolean  RecP1,
@@ -304,7 +304,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::PerformFirstSection
   iscomplete = Standard_False;
   comptra    = Standard_False;
   line       = new BRepBlend_Line();
-  tolesp     = Abs(Tolesp);
+  tolpoint3d   = Tol3d;
   tolgui     = Abs(TolGuide);
   rebrou     = Standard_False;
   
@@ -327,7 +327,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::PerformFirstSection
   wp1   = wp2 = wrst1 = wrst2 = Pmax;
   param = Pdep;
   Func.Set(param);
-  Func.GetTolerance(tolerance, tolesp);
+  Func.GetTolerance(tolerance, tolpoint3d);
   Func.GetBounds(infbound, supbound);
 
   math_FunctionSetRoot rsnld(Func, tolerance, 30);
@@ -573,7 +573,7 @@ void BRepBlend_RstRstLineBuilder::InternalPerform(Blend_RstRstFunction&   Func,
 
   //IntSurf_Transition Tline, Tarc;
 
-  Func.GetTolerance(tolerance, tolesp);
+  Func.GetTolerance(tolerance, tolpoint3d);
   Func.GetBounds(infbound, supbound);
 
   math_FunctionSetRoot rsnld(Func, tolerance, 30);
@@ -595,14 +595,14 @@ void BRepBlend_RstRstLineBuilder::InternalPerform(Blend_RstRstFunction&   Func,
     if (rsnld.IsDone()) {
       rsnld.Root(sol);
       Blend_Point bp1;
-      if(BBPP(param, Func, sol, tolesp, bp1)){
+      if(BBPP(param, Func, sol, tolpoint3d, bp1)){
 	Standard_Real dw = 1.e-10;
 	Func.Set(param + dw);
 	rsnld.Perform(Func, parinit, infbound, supbound);
 	if (rsnld.IsDone()) {
 	  rsnld.Root(sol);
 	  Blend_Point bp2;
-	  if(BBPP(param + dw, Func, sol, tolesp, bp2)){
+	  if(BBPP(param + dw, Func, sol, tolpoint3d, bp2)){
 	    tracederiv(Func, bp1, bp2);
 	  }
 	}
@@ -854,7 +854,7 @@ void BRepBlend_RstRstLineBuilder::InternalPerform(Blend_RstRstFunction&   Func,
 	  Arrive = Standard_True;
 	  Extrst1.SetValue(previousP.PointOnC1(),
 			   previousP.ParameterOnC1(),
-			   previousP.Parameter(), tolesp);
+			   previousP.Parameter(), tolpoint3d);
 	  MakeExtremity(Extrst2, Standard_False, rst2, sol(2), IsVtxrst2, Vtxrst2);
 	  // Show that end is on Bound.
 	}
@@ -873,10 +873,10 @@ void BRepBlend_RstRstLineBuilder::InternalPerform(Blend_RstRstFunction&   Func,
 	if (Abs(stepw) < tolgui) {
 	  Extrst1.SetValue(previousP.PointOnC1(),
 			   previousP.ParameterOnC1(),
-			   previousP.Parameter(), tolesp);
+			   previousP.Parameter(), tolpoint3d);
 	  Extrst2.SetValue(previousP.PointOnC2(),
 			   previousP.ParameterOnC2(),
-			   previousP.Parameter(), tolesp);
+			   previousP.Parameter(), tolpoint3d);
 	  Arrive = Standard_True;
 #ifdef OCCT_DEBUG
 	  if (line->NbPoints()>=2) {
@@ -913,7 +913,7 @@ void BRepBlend_RstRstLineBuilder::InternalPerform(Blend_RstRstFunction&   Func,
 	  Arrive = Standard_True;
 	  Extrst1.SetValue(previousP.PointOnC1(),
 			   previousP.ParameterOnC1(),
-			   previousP.Parameter(), tolesp);
+			   previousP.Parameter(), tolpoint3d);
 	  MakeExtremity(Extrst2, Standard_False, rst2, sol(2), IsVtxrst2, Vtxrst2);
 	  // Indicate that end is on Bound.
 	}
@@ -993,10 +993,10 @@ void BRepBlend_RstRstLineBuilder::InternalPerform(Blend_RstRstFunction&   Func,
 #endif
 	Extrst1.SetValue(previousP.PointOnC1(),
 			 previousP.ParameterOnC1(),
-			 previousP.Parameter(), tolesp);
+			 previousP.Parameter(), tolpoint3d);
 	Extrst2.SetValue(previousP.PointOnC2(),
 			 previousP.ParameterOnC2(),
-			 previousP.Parameter(), tolesp);
+			 previousP.Parameter(), tolpoint3d);
 	Arrive = Standard_True;
       }
       break;
@@ -1029,7 +1029,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::Recadre1(Blend_RstRstFunction&
 						       Handle(Adaptor3d_HVertex)& Vtx) 
 {
   math_Vector toler(1, 3), infb(1, 3), supb(1, 3);
-  Finv.GetTolerance(toler, tolesp);
+  Finv.GetTolerance(toler, tolpoint3d);
   Finv.GetBounds(infb, supb);
   Solinv(1) = param;
   Solinv(2) = sol(2);
@@ -1049,7 +1049,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::Recadre1(Blend_RstRstFunction&
 
   // It is necessary to check if the function value meets the
   // second restriction
-  if (Finv.IsSolution(Solinv, tolesp)) {
+  if (Finv.IsSolution(Solinv, tolpoint3d)) {
     Standard_Real w = Solinv(2);
     if(w < rst2->FirstParameter() - toler(2)||
        w > rst2->LastParameter() + toler(2)){
@@ -1079,7 +1079,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::Recadre1(Blend_RstRstFunction&
 
     math_Vector infbound(1, 2), supbound(1, 2);
     math_Vector parinit(1, 2), tolerance(1, 2);
-    Func.GetTolerance(tolerance, tolesp);
+    Func.GetTolerance(tolerance, tolpoint3d);
     Func.GetBounds(infbound, supbound);
 
     math_FunctionSetRoot rsnld2(Func, tolerance, 30);
@@ -1112,7 +1112,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::Recadre2(Blend_RstRstFunction&
 						       Handle(Adaptor3d_HVertex)& Vtx) 
 {
   math_Vector toler(1, 3), infb(1, 3), supb(1, 3);
-  Finv.GetTolerance(toler, tolesp);
+  Finv.GetTolerance(toler, tolpoint3d);
   Finv.GetBounds(infb, supb);
   Solinv(1) = param;
   Solinv(2) = sol(1);
@@ -1130,7 +1130,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::Recadre2(Blend_RstRstFunction&
   rsnld.Root(Solinv);
 
   // It is necessary to check the value of the function
-  if (Finv.IsSolution(Solinv, tolesp)) {
+  if (Finv.IsSolution(Solinv, tolpoint3d)) {
     Standard_Real w = Solinv(2);
     if(w < rst1->FirstParameter() - toler(2)||
        w > rst1->LastParameter() + toler(2)){
@@ -1159,7 +1159,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::Recadre2(Blend_RstRstFunction&
    
     math_Vector infbound(1, 2), supbound(1, 2);
     math_Vector parinit(1,2), tolerance(1,2);
-    Func.GetTolerance(tolerance, tolesp);
+    Func.GetTolerance(tolerance, tolpoint3d);
     Func.GetBounds(infbound, supbound);
 
     math_FunctionSetRoot rsnld2(Func, tolerance, 30);
@@ -1199,7 +1199,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::Recadre1(Blend_CurvPointFuncInv&
 
   FinvP.Set(thepoint);
   math_Vector toler(1,2), infb(1, 2), supb(1, 2);
-  FinvP.GetTolerance(toler, tolesp);
+  FinvP.GetTolerance(toler, tolpoint3d);
   FinvP.GetBounds(infb, supb);
   Solinv(1) = param;
   Solinv(2) = sol(2);
@@ -1214,7 +1214,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::Recadre1(Blend_CurvPointFuncInv&
   }
   rsnld.Root(Solinv);
   
-  if(FinvP.IsSolution(Solinv, tolesp)){
+  if(FinvP.IsSolution(Solinv, tolpoint3d)){
     gp_Pnt2d p2drst2  = rst2->Value(Solinv(2));
     TopAbs_State situ = domain2->Classify(p2drst2, toler(2), 0);
     if ((situ != TopAbs_IN) && (situ != TopAbs_ON)) {
@@ -1267,7 +1267,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::Recadre2(Blend_CurvPointFuncInv&
 
   FinvP.Set(thepoint);
   math_Vector toler(1,2), infb(1, 2), supb(1, 2);
-  FinvP.GetTolerance(toler, tolesp);
+  FinvP.GetTolerance(toler, tolpoint3d);
   FinvP.GetBounds(infb, supb);
   Solinv(1) = param;
   Solinv(2) = sol(1);
@@ -1282,7 +1282,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::Recadre2(Blend_CurvPointFuncInv&
   }
   rsnld.Root(Solinv);
   
-  if(FinvP.IsSolution(Solinv, tolesp)){
+  if(FinvP.IsSolution(Solinv, tolpoint3d)){
     gp_Pnt2d p2drst1  = rst1->Value(Solinv(2));
     TopAbs_State situ = domain1->Classify(p2drst1, toler(2), 0);
     if ((situ != TopAbs_IN) && (situ != TopAbs_ON)) {
@@ -1378,7 +1378,7 @@ void BRepBlend_RstRstLineBuilder::MakeExtremity(BRepBlend_Extremity&
   if (OnFirst) {
     Extrem.SetValue(previousP.PointOnC1(),
 		    sol(1),
-		    previousP.Parameter(), tolesp);
+		    previousP.Parameter(), tolpoint3d);
     if (!previousP.IsTangencyPoint()) 
       Extrem.SetTangent(previousP.TangentOnC1());
     Iter = domain1;
@@ -1386,7 +1386,7 @@ void BRepBlend_RstRstLineBuilder::MakeExtremity(BRepBlend_Extremity&
   else {
     Extrem.SetValue(previousP.PointOnC2(),
 		    sol(2),
-		    previousP.Parameter(), tolesp);
+		    previousP.Parameter(), tolpoint3d);
     if (!previousP.IsTangencyPoint()) 
       Extrem.SetTangent(previousP.TangentOnC1());
     Iter = domain2;
@@ -1453,12 +1453,13 @@ Blend_Status BRepBlend_RstRstLineBuilder::CheckDeflectionOnRst1(const Blend_Poin
   Norme = Corde.SquareMagnitude();
   if (!prevpointistangent) prevNorme = prevTg.SquareMagnitude();
 
-  if (Norme <= tolesp * tolesp) {
+  const Standard_Real toler3d = 0.01 * tolpoint3d;
+  if (Norme <= toler3d * toler3d) {
     // it can be necessary to force the same point
     return Blend_SamePoints;
   }
   if(!prevpointistangent){
-    if (prevNorme <= tolesp * tolesp) {
+    if (prevNorme <= toler3d * toler3d) {
       return Blend_SamePoints;
     }
     Cosi = sens * Corde * prevTg;
@@ -1530,12 +1531,13 @@ Blend_Status BRepBlend_RstRstLineBuilder::CheckDeflectionOnRst2(const Blend_Poin
   Norme = Corde.SquareMagnitude();
   if (!prevpointistangent) prevNorme = prevTg.SquareMagnitude();
 
-  if (Norme <= tolesp * tolesp){
+  const Standard_Real toler3d = 0.01 * tolpoint3d;
+  if (Norme <= toler3d * toler3d){
     // it can be necessary to force the same point
     return Blend_SamePoints;
   }
   if (!prevpointistangent) {
-    if (prevNorme <= tolesp * tolesp) {
+    if (prevNorme <= toler3d * toler3d) {
       return Blend_SamePoints;
     }
     Cosi = sens * Corde * prevTg;
@@ -1597,7 +1599,7 @@ Blend_Status BRepBlend_RstRstLineBuilder::TestArret(Blend_RstRstFunction& Func,
   IntSurf_TypeTrans trarst1 = IntSurf_Undecided, trarst2 = IntSurf_Undecided;
   Blend_Point curpoint;
 
-  if (Func.IsSolution(sol, tolesp)) {
+  if (Func.IsSolution(sol, tolpoint3d)) {
     Standard_Boolean curpointistangent = Func.IsTangencyPoint();
     ptrst1   = Func.PointOnRst1();
     ptrst2   = Func.PointOnRst2();
@@ -1644,7 +1646,7 @@ Blend_Status BRepBlend_RstRstLineBuilder::TestArret(Blend_RstRstFunction& Func,
       Standard_Real testra = tg2drst1.Dot(tg2drstref);
       TopAbs_Orientation Or = domain1->Orientation(rst1);
 
-      if (Abs(testra) > tolesp) {
+      if (Abs(testra) > tolpoint3d) {
 	if (testra < 0.) {
           trarst1 = ConvOrToTra(TopAbs::Reverse(Or));
 	}
@@ -1656,7 +1658,7 @@ Blend_Status BRepBlend_RstRstLineBuilder::TestArret(Blend_RstRstFunction& Func,
 	testra = tg2drst2.Dot(tg2drstref);
 
 	Or = domain2->Orientation(rst2);
-	if (Abs(testra) > tolesp) {
+	if (Abs(testra) > tolpoint3d) {
 	  if (testra < 0.) {
 	    trarst2 = ConvOrToTra(TopAbs::Reverse(Or));
 	  }
@@ -1705,7 +1707,7 @@ Standard_Boolean BRepBlend_RstRstLineBuilder::CheckInside(Blend_RstRstFunction&
 {
 //  Standard_Boolean inside = Standard_True;
   math_Vector tolerance(1, 2);
-  Func.GetTolerance(tolerance, tolesp);
+  Func.GetTolerance(tolerance, tolpoint3d);
 
   //face pcurve 1.
   Standard_Real v = sol(1);

src/BRepBlend/BRepBlend_RstRstLineBuilder.hxx

@@ -72,9 +72,9 @@ public:
   
   Standard_EXPORT BRepBlend_RstRstLineBuilder(const Handle(Adaptor3d_Surface)& Surf1, const Handle(Adaptor2d_Curve2d)& Rst1, const Handle(Adaptor3d_TopolTool)& Domain1, const Handle(Adaptor3d_Surface)& Surf2, const Handle(Adaptor2d_Curve2d)& Rst2, const Handle(Adaptor3d_TopolTool)& Domain2);
   
-  Standard_EXPORT void Perform (Blend_RstRstFunction& Func, Blend_SurfCurvFuncInv& Finv1, Blend_CurvPointFuncInv& FinvP1, Blend_SurfCurvFuncInv& Finv2, Blend_CurvPointFuncInv& FinvP2, const Standard_Real Pdep, const Standard_Real Pmax, const Standard_Real MaxStep, const Standard_Real TolGuide, const math_Vector& Soldep, const Standard_Real Tolesp, const Standard_Real Fleche, const Standard_Boolean Appro = Standard_False);
+  Standard_EXPORT void Perform (Blend_RstRstFunction& Func, Blend_SurfCurvFuncInv& Finv1, Blend_CurvPointFuncInv& FinvP1, Blend_SurfCurvFuncInv& Finv2, Blend_CurvPointFuncInv& FinvP2, const Standard_Real Pdep, const Standard_Real Pmax, const Standard_Real MaxStep, const Standard_Real Tol3d, const Standard_Real TolGuide, const math_Vector& Soldep, const Standard_Real Fleche, const Standard_Boolean Appro = Standard_False);
   
-  Standard_EXPORT Standard_Boolean PerformFirstSection (Blend_RstRstFunction& Func, Blend_SurfCurvFuncInv& Finv1, Blend_CurvPointFuncInv& FinvP1, Blend_SurfCurvFuncInv& Finv2, Blend_CurvPointFuncInv& FinvP2, const Standard_Real Pdep, const Standard_Real Pmax, const math_Vector& Soldep, const Standard_Real Tolesp, const Standard_Real TolGuide, const Standard_Boolean RecRst1, const Standard_Boolean RecP1, const Standard_Boolean RecRst2, const Standard_Boolean RecP2, Standard_Real& Psol, math_Vector& ParSol);
+  Standard_EXPORT Standard_Boolean PerformFirstSection (Blend_RstRstFunction& Func, Blend_SurfCurvFuncInv& Finv1, Blend_CurvPointFuncInv& FinvP1, Blend_SurfCurvFuncInv& Finv2, Blend_CurvPointFuncInv& FinvP2, const Standard_Real Pdep, const Standard_Real Pmax, const math_Vector& Soldep, const Standard_Real Tol3d, const Standard_Real TolGuide, const Standard_Boolean RecRst1, const Standard_Boolean RecP1, const Standard_Boolean RecRst2, const Standard_Boolean RecP2, Standard_Real& Psol, math_Vector& ParSol);
   
   Standard_EXPORT Standard_Boolean Complete (Blend_RstRstFunction& Func, Blend_SurfCurvFuncInv& Finv1, Blend_CurvPointFuncInv& FinvP1, Blend_SurfCurvFuncInv& Finv2, Blend_CurvPointFuncInv& FinvP2, const Standard_Real Pmin);
   
@@ -134,7 +134,7 @@ private:
   Handle(Adaptor3d_TopolTool) domain2;
   Handle(Adaptor2d_Curve2d) rst1;
   Handle(Adaptor2d_Curve2d) rst2;
-  Standard_Real tolesp;
+  Standard_Real tolpoint3d;
   Standard_Real tolgui;
   Standard_Real pasmax;
   Standard_Real fleche;

src/BRepBlend/BRepBlend_SurfRstLineBuilder.cxx

@@ -210,7 +210,7 @@ BRepBlend_SurfRstLineBuilder::BRepBlend_SurfRstLineBuilder
  const Handle(Adaptor3d_TopolTool)& Domain2):
  done(Standard_False), sol(1, 3), surf1(Surf1),
  domain1(Domain1), surf2(Surf2), rst(Rst),
- domain2(Domain2), tolesp(0.0), tolgui(0.0),
+ domain2(Domain2), tolpoint3d(0.0), tolpoint2d(0.0), tolgui(0.0),
  pasmax(0.0), fleche(0.0), param(0.0),
  rebrou(Standard_False), iscomplete(Standard_False),
  comptra(Standard_False), sens(0.0),
@@ -230,9 +230,10 @@ void BRepBlend_SurfRstLineBuilder::Perform(Blend_SurfRstFunction&  Func,
 					   const Standard_Real     Pdep,
 					   const Standard_Real     Pmax,
 					   const Standard_Real     MaxStep,
+             const Standard_Real     Tol3d,
+             const Standard_Real     Tol2d,
 					   const Standard_Real     TolGuide,
 					   const math_Vector&      ParDep,
-					   const Standard_Real     Tolesp,
 					   const Standard_Real     Fleche,
 					   const Standard_Boolean  Appro) 
 {
@@ -240,7 +241,8 @@ void BRepBlend_SurfRstLineBuilder::Perform(Blend_SurfRstFunction&  Func,
   iscomplete = Standard_False;
   comptra = Standard_False;
   line = new BRepBlend_Line();
-  tolesp = Abs(Tolesp);
+  tolpoint3d = Tol3d;
+  tolpoint2d = Tol2d;
   tolgui = Abs(TolGuide);
   fleche = Abs(Fleche);
   rebrou = Standard_False;
@@ -262,7 +264,7 @@ void BRepBlend_SurfRstLineBuilder::Perform(Blend_SurfRstFunction&  Func,
     TopAbs_State siturst,situs;
     Standard_Boolean decroch;
     math_Vector tolerance(1,3),infbound(1,3),supbound(1,3);
-    Func.GetTolerance(tolerance,tolesp);
+    Func.GetTolerance(tolerance,tolpoint3d);
     Func.GetBounds(infbound,supbound);
     math_FunctionSetRoot rsnld(Func,tolerance,30);
     
@@ -296,9 +298,9 @@ void BRepBlend_SurfRstLineBuilder::Perform(Blend_SurfRstFunction&  Func,
 //  W = previousP.ParameterOnC();
   
   BRepBlend_Extremity ptf1(previousP.PointOnS(),
-			   U,V,previousP.Parameter(),tolesp);
+			   U,V,previousP.Parameter(),tolpoint3d);
   BRepBlend_Extremity ptf2(previousP.PointOnC(),
-			   U,V,previousP.Parameter(),tolesp);
+			   U,V,previousP.Parameter(),tolpoint3d);
   if (!previousP.IsTangencyPoint()) {
     ptf1.SetTangent(previousP.TangentOnS());
     ptf2.SetTangent(previousP.TangentOnC());
@@ -327,7 +329,8 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::PerformFirstSection
  const Standard_Real     Pdep,
  const Standard_Real     Pmax,
  const math_Vector&      ParDep,
- const Standard_Real     Tolesp,
+ const Standard_Real     Tol3d,
+ const Standard_Real     Tol2d,
  const Standard_Real     TolGuide,
  const Standard_Boolean  RecRst,
  const Standard_Boolean  RecP,
@@ -339,7 +342,8 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::PerformFirstSection
   iscomplete = Standard_False;
   comptra = Standard_False;
   line = new BRepBlend_Line();
-  tolesp = Abs(Tolesp);
+  tolpoint3d = Tol3d;
+  tolpoint2d = Tol2d;
   tolgui = Abs(TolGuide);
   rebrou = Standard_False;
   
@@ -362,7 +366,7 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::PerformFirstSection
   wp = wrst = ws = Pmax;
   param = Pdep;
   Func.Set(param);
-  Func.GetTolerance(tolerance,tolesp);
+  Func.GetTolerance(tolerance,tolpoint3d);
   Func.GetBounds(infbound,supbound);
 
   math_FunctionSetRoot rsnld(Func,tolerance,30);
@@ -536,7 +540,7 @@ void BRepBlend_SurfRstLineBuilder::InternalPerform(Blend_SurfRstFunction&  Func,
 
   //IntSurf_Transition Tline,Tarc;
 
-  Func.GetTolerance(tolerance,tolesp);
+  Func.GetTolerance(tolerance,tolpoint3d);
   Func.GetBounds(infbound,supbound);
 
   math_FunctionSetRoot rsnld(Func,tolerance,30);
@@ -558,14 +562,14 @@ void BRepBlend_SurfRstLineBuilder::InternalPerform(Blend_SurfRstFunction&  Func,
     if (rsnld.IsDone()) {
       rsnld.Root(sol);
       Blend_Point bp1;
-      if(BBPP(param,Func,sol,tolesp,bp1)){
+      if(BBPP(param,Func,sol,tolpoint3d,bp1)){
 	Standard_Real dw = 1.e-10;
 	Func.Set(param+dw);
 	rsnld.Perform(Func,parinit,infbound,supbound);
 	if (rsnld.IsDone()) {
 	  rsnld.Root(sol);
 	  Blend_Point bp2;
-	  if(BBPP(param+dw,Func,sol,tolesp,bp2)){
+	  if(BBPP(param+dw,Func,sol,tolpoint3d,bp2)){
 	    tracederiv(Func,bp1,bp2);
 	  }
 	}
@@ -746,7 +750,7 @@ void BRepBlend_SurfRstLineBuilder::InternalPerform(Blend_SurfRstFunction&  Func,
 	  Arrive = Standard_True;
 	  Exts.SetValue(previousP.PointOnS(),
 			sol(1),sol(2),
-			previousP.Parameter(),tolesp);
+			previousP.Parameter(),tolpoint3d);
 	  MakeExtremity(Extrst,Standard_False,rst,sol(3),IsVtxrst,Vtxrst);
 	  // Indicate end on Bound.
 	}
@@ -765,10 +769,10 @@ void BRepBlend_SurfRstLineBuilder::InternalPerform(Blend_SurfRstFunction&  Func,
 	if (Abs(stepw) < tolgui) {
 	  previousP.ParametersOnS(U,V);
 	  Exts.SetValue(previousP.PointOnS(),U,V,
-			previousP.Parameter(),tolesp);
+			previousP.Parameter(),tolpoint3d);
 	  Extrst.SetValue(previousP.PointOnC(),
 			  previousP.ParameterOnC(),
-			  previousP.Parameter(),tolesp);
+			  previousP.Parameter(),tolpoint3d);
 	  Arrive = Standard_True;
 	  if (line->NbPoints()>=2) {
 	    // Indicate that one stops during the processing
@@ -804,7 +808,7 @@ void BRepBlend_SurfRstLineBuilder::InternalPerform(Blend_SurfRstFunction&  Func,
 	if (param == Bound) {
 	  Arrive = Standard_True;
 	  Exts.SetValue(previousP.PointOnS(),sol(1),sol(2),
-			previousP.Parameter(),tolesp);
+			previousP.Parameter(),tolpoint3d);
 	  MakeExtremity(Extrst,Standard_False,rst,sol(3),IsVtxrst,Vtxrst);
 	  // Indicate end on Bound.
 	}
@@ -850,7 +854,7 @@ void BRepBlend_SurfRstLineBuilder::InternalPerform(Blend_SurfRstFunction&  Func,
 	  line->Prepend(previousP);
 	}
 	Exts.SetValue(previousP.PointOnS(),sol(1),sol(2),
-		      previousP.Parameter(),tolesp);
+		      previousP.Parameter(),tolpoint3d);
 	MakeExtremity(Extrst,Standard_False,rst,sol(3),IsVtxrst,Vtxrst);
 	Arrive = Standard_True;
       }
@@ -883,10 +887,10 @@ void BRepBlend_SurfRstLineBuilder::InternalPerform(Blend_SurfRstFunction&  Func,
 #endif
 	previousP.ParametersOnS(U,V);
 	Exts.SetValue(previousP.PointOnS(),U,V,
-		      previousP.Parameter(),tolesp);
+		      previousP.Parameter(),tolpoint3d);
 	Extrst.SetValue(previousP.PointOnC(),
 			previousP.ParameterOnC(),
-			previousP.Parameter(),tolesp);
+			previousP.Parameter(),tolpoint3d);
 	Arrive = Standard_True;
       }
       break;
@@ -941,7 +945,10 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::Recadre(Blend_SurfCurvFuncInv&
   FinvC.Set(Arc);
   
   math_Vector toler(1,3),infb(1,3),supb(1,3);
-  FinvC.GetTolerance(toler,tolesp);
+  // use reduced Tol argument value to pass testcase
+  // blend complex A6 with scale factor of model 0.1 (base scale = 1000)
+  // So, here we using 1.0e-5 rather than 1.0e-4 of tolerance of point in 3d
+  FinvC.GetTolerance(toler,0.1 * tolpoint3d);
   FinvC.GetBounds(infb,supb);
   Solinv(1) = param;
   Solinv(2) = sol(3);
@@ -958,7 +965,7 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::Recadre(Blend_SurfCurvFuncInv&
   else {
       // It is necessary to check the value of the function
     rsnld.Root(Solinv);
-    recadre = FinvC.IsSolution(Solinv,tolesp);
+    recadre = FinvC.IsSolution(Solinv,tolpoint3d);
   }
 
   // In case of fail, it is checked if another arc 
@@ -981,7 +988,7 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::Recadre(Blend_SurfCurvFuncInv&
     Arc = domain1->Value();
     FinvC.Set(Arc);
   
-    FinvC.GetTolerance(toler,tolesp);
+    FinvC.GetTolerance(toler,tolpoint3d);
     FinvC.GetBounds(infb,supb);
 
     Solinv(3) = pmin;
@@ -997,7 +1004,7 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::Recadre(Blend_SurfCurvFuncInv&
     else {
       // It is necessary to check the value of the function
       aRsnld.Root(Solinv);
-      recadre = FinvC.IsSolution(Solinv,tolesp);
+      recadre = FinvC.IsSolution(Solinv,tolpoint3d);
     }
   }  
 
@@ -1041,7 +1048,7 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::Recadre(Blend_SurfRstFunction&
 						       Handle(Adaptor3d_HVertex)& Vtx) 
 {
   math_Vector toler(1,4),infb(1,4),supb(1,4);
-  Finv.GetTolerance(toler,tolesp);
+  Finv.GetTolerance(toler,tolpoint3d);
   Finv.GetBounds(infb,supb);
   Solinv(1) = sol(3);
   Solinv(2) = param;
@@ -1058,9 +1065,9 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::Recadre(Blend_SurfRstFunction&
   }
   rsnld.Root(Solinv);
   
-  if(Finv.IsSolution(Solinv,tolesp)){
+  if(Finv.IsSolution(Solinv,tolpoint3d)){
     gp_Pnt2d p2d(Solinv(3),Solinv(4));
-    TopAbs_State situ = domain1->Classify(p2d,Min(toler(3),toler(4)),0);
+    TopAbs_State situ = domain1->Classify(p2d,tolpoint2d,0);
     if ((situ != TopAbs_IN) && (situ != TopAbs_ON)) {
       return Standard_False;
     }
@@ -1086,7 +1093,7 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::Recadre(Blend_SurfRstFunction&
 
     math_Vector infbound(1,3),supbound(1,3);
     math_Vector parinit(1,3),tolerance(1,3);
-    Func.GetTolerance(tolerance,tolesp);
+    Func.GetTolerance(tolerance,tolpoint3d);
     Func.GetBounds(infbound,supbound);
 
     math_FunctionSetRoot rsnld2(Func,tolerance,30);
@@ -1126,7 +1133,7 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::Recadre(Blend_SurfPointFuncInv&
 
   FinvP.Set(thepoint);
   math_Vector toler(1,3),infb(1,3),supb(1,3);
-  FinvP.GetTolerance(toler,tolesp);
+  FinvP.GetTolerance(toler,tolpoint3d);
   FinvP.GetBounds(infb,supb);
   Solinv(1) = param;
   Solinv(2) = sol(1);
@@ -1142,9 +1149,9 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::Recadre(Blend_SurfPointFuncInv&
   }
   rsnld.Root(Solinv);
   
-  if(FinvP.IsSolution(Solinv,tolesp)){
+  if(FinvP.IsSolution(Solinv,tolpoint3d)){
     gp_Pnt2d p2d(Solinv(2),Solinv(3));
-    TopAbs_State situ = domain1->Classify(p2d,Min(toler(2),toler(3)),0);
+    TopAbs_State situ = domain1->Classify(p2d,tolpoint2d,0);
     if ((situ != TopAbs_IN) && (situ != TopAbs_ON)) {
       return Standard_False;
     }
@@ -1237,7 +1244,7 @@ void BRepBlend_SurfRstLineBuilder::MakeExtremity(BRepBlend_Extremity&
   if (OnFirst) {
     Extrem.SetValue(previousP.PointOnS(),
 		    sol(1),sol(2),
-		    previousP.Parameter(),tolesp);
+		    previousP.Parameter(),tolpoint3d);
     if (!previousP.IsTangencyPoint()) 
       Extrem.SetTangent(previousP.TangentOnS());
     Iter = domain1;
@@ -1245,7 +1252,7 @@ void BRepBlend_SurfRstLineBuilder::MakeExtremity(BRepBlend_Extremity&
   else {
     Extrem.SetValue(previousP.PointOnC(),
 		    sol(3),
-		    previousP.Parameter(),tolesp);
+		    previousP.Parameter(),tolpoint3d);
     if (!previousP.IsTangencyPoint()) 
       Extrem.SetTangent(previousP.TangentOnC());    
     Iter = domain2;
@@ -1312,12 +1319,13 @@ Blend_Status BRepBlend_SurfRstLineBuilder::CheckDeflectionOnSurf(const Blend_Poi
 //  if(!curpointistangent) curNorme = Tgsurf.SquareMagnitude();
   if(!prevpointistangent) prevNorme = prevTg.SquareMagnitude();
 
-  if (Norme <= tolesp*tolesp){
+  const Standard_Real toler3d = 0.01 * tolpoint3d;
+  if (Norme <= toler3d * toler3d){
     // it can be necessary to force same point
     return Blend_SamePoints;
   }
   if(!prevpointistangent){
-    if(prevNorme <= tolesp*tolesp) {
+    if(prevNorme <= toler3d * toler3d) {
       return Blend_SamePoints;
     }
     Cosi = sens*Corde*prevTg;
@@ -1388,12 +1396,13 @@ Blend_Status BRepBlend_SurfRstLineBuilder::CheckDeflectionOnRst(const Blend_Poin
 //  if(!curpointistangent) curNorme = Tgsurf.SquareMagnitude();
   if(!prevpointistangent) prevNorme = prevTg.SquareMagnitude();
 
-  if (Norme <= tolesp*tolesp){
+  const Standard_Real toler3d = 0.01 * tolpoint3d;
+  if (Norme <= toler3d * toler3d){
     // it can be necessary to force same point
     return Blend_SamePoints;
   }
   if(!prevpointistangent){
-    if(prevNorme <= tolesp*tolesp) {
+    if(prevNorme <= toler3d * toler3d) {
       return Blend_SamePoints;
     }
     Cosi = sens*Corde*prevTg;
@@ -1455,7 +1464,7 @@ Blend_Status BRepBlend_SurfRstLineBuilder::TestArret(Blend_SurfRstFunction& Func
   IntSurf_TypeTrans tras = IntSurf_Undecided, trarst = IntSurf_Undecided;
   Blend_Point curpoint;
 
-  if (Func.IsSolution(sol,tolesp)) {
+  if (Func.IsSolution(sol,tolpoint3d)) {
     Standard_Boolean curpointistangent = Func.IsTangencyPoint();
     pts = Func.PointOnS();
     ptrst = Func.PointOnRst();
@@ -1499,7 +1508,7 @@ Blend_Status BRepBlend_SurfRstLineBuilder::TestArret(Blend_SurfRstFunction& Func
       Func.Decroch(sol,nors,tgsecs);
       nors.Normalize();
       Standard_Real testra = tgsecs.Dot(nors.Crossed(tgs));
-      if (Abs(testra) > tolesp) {
+      if (Abs(testra) > tolpoint3d) {
 	if (testra < 0.) {
 	  tras = IntSurf_In;
 	}
@@ -1558,7 +1567,7 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::CheckInside(Blend_SurfRstFunction
 							   Standard_Boolean&      Decroch)
 {
   math_Vector tolerance(1,3);
-  Func.GetTolerance(tolerance,tolesp);
+  Func.GetTolerance(tolerance,tolpoint3d);
   //face pcurve.
   Standard_Real w = sol(3);
   if(w < rst->FirstParameter() - tolerance(3)||
@@ -1573,7 +1582,7 @@ Standard_Boolean BRepBlend_SurfRstLineBuilder::CheckInside(Blend_SurfRstFunction
 
   //face surface
   gp_Pnt2d p2d(sol(1),sol(2));
-  SituOnS = domain1->Classify(p2d,Min(tolerance(1),tolerance(2)),0);
+  SituOnS = domain1->Classify(p2d,tolpoint2d,0);
 
   //lost contact
   gp_Vec tgs,nors;

src/BRepBlend/BRepBlend_SurfRstLineBuilder.hxx

@@ -71,9 +71,9 @@ public:
   
   Standard_EXPORT BRepBlend_SurfRstLineBuilder(const Handle(Adaptor3d_Surface)& Surf1, const Handle(Adaptor3d_TopolTool)& Domain1, const Handle(Adaptor3d_Surface)& Surf2, const Handle(Adaptor2d_Curve2d)& Rst, const Handle(Adaptor3d_TopolTool)& Domain2);
   
-  Standard_EXPORT void Perform (Blend_SurfRstFunction& Func, Blend_FuncInv& Finv, Blend_SurfPointFuncInv& FinvP, Blend_SurfCurvFuncInv& FinvC, const Standard_Real Pdep, const Standard_Real Pmax, const Standard_Real MaxStep, const Standard_Real TolGuide, const math_Vector& Soldep, const Standard_Real Tolesp, const Standard_Real Fleche, const Standard_Boolean Appro = Standard_False);
+  Standard_EXPORT void Perform (Blend_SurfRstFunction& Func, Blend_FuncInv& Finv, Blend_SurfPointFuncInv& FinvP, Blend_SurfCurvFuncInv& FinvC, const Standard_Real Pdep, const Standard_Real Pmax, const Standard_Real MaxStep, const Standard_Real Tol3d, const Standard_Real Tol2d, const Standard_Real TolGuide, const math_Vector& Soldep, const Standard_Real Fleche, const Standard_Boolean Appro = Standard_False);
   
-  Standard_EXPORT Standard_Boolean PerformFirstSection (Blend_SurfRstFunction& Func, Blend_FuncInv& Finv, Blend_SurfPointFuncInv& FinvP, Blend_SurfCurvFuncInv& FinvC, const Standard_Real Pdep, const Standard_Real Pmax, const math_Vector& Soldep, const Standard_Real Tolesp, const Standard_Real TolGuide, const Standard_Boolean RecRst, const Standard_Boolean RecP, const Standard_Boolean RecS, Standard_Real& Psol, math_Vector& ParSol);
+  Standard_EXPORT Standard_Boolean PerformFirstSection (Blend_SurfRstFunction& Func, Blend_FuncInv& Finv, Blend_SurfPointFuncInv& FinvP, Blend_SurfCurvFuncInv& FinvC, const Standard_Real Pdep, const Standard_Real Pmax, const math_Vector& Soldep, const Standard_Real Tol3d, const Standard_Real Tol2d, const Standard_Real TolGuide, const Standard_Boolean RecRst, const Standard_Boolean RecP, const Standard_Boolean RecS, Standard_Real& Psol, math_Vector& ParSol);
   
   Standard_EXPORT Standard_Boolean Complete (Blend_SurfRstFunction& Func, Blend_FuncInv& Finv, Blend_SurfPointFuncInv& FinvP, Blend_SurfCurvFuncInv& FinvC, const Standard_Real Pmin);
   
@@ -128,7 +128,8 @@ private:
   Handle(Adaptor3d_Surface) surf2;
   Handle(Adaptor2d_Curve2d) rst;
   Handle(Adaptor3d_TopolTool) domain2;
-  Standard_Real tolesp;
+  Standard_Real tolpoint3d;
+  Standard_Real tolpoint2d;
   Standard_Real tolgui;
   Standard_Real pasmax;
   Standard_Real fleche;

src/BRepBlend/BRepBlend_Walking.hxx

@@ -58,11 +58,11 @@ public:
   //! To define singular points computed before walking.
   Standard_EXPORT void AddSingularPoint (const Blend_Point& P);
   
-  Standard_EXPORT void Perform (Blend_Function& F, Blend_FuncInv& FInv, const Standard_Real Pdep, const Standard_Real Pmax, const Standard_Real MaxStep, const Standard_Real TolGuide, const math_Vector& Soldep, const Standard_Real Tolesp, const Standard_Real Fleche, const Standard_Boolean Appro = Standard_False);
+  Standard_EXPORT void Perform (Blend_Function& F, Blend_FuncInv& FInv, const Standard_Real Pdep, const Standard_Real Pmax, const Standard_Real MaxStep, const Standard_Real Tol3d, const Standard_Real TolGuide, const math_Vector& Soldep, const Standard_Real Fleche, const Standard_Boolean Appro = Standard_False);
   
-  Standard_EXPORT Standard_Boolean PerformFirstSection (Blend_Function& F, const Standard_Real Pdep, math_Vector& ParDep, const Standard_Real Tolesp, const Standard_Real TolGuide, TopAbs_State& Pos1, TopAbs_State& Pos2);
+  Standard_EXPORT Standard_Boolean PerformFirstSection (Blend_Function& F, const Standard_Real Pdep, math_Vector& ParDep, const Standard_Real Tol3d, const Standard_Real TolGuide, TopAbs_State& Pos1, TopAbs_State& Pos2);
   
-  Standard_EXPORT Standard_Boolean PerformFirstSection (Blend_Function& F, Blend_FuncInv& FInv, const Standard_Real Pdep, const Standard_Real Pmax, const math_Vector& ParDep, const Standard_Real Tolesp, const Standard_Real TolGuide, const Standard_Boolean RecOnS1, const Standard_Boolean RecOnS2, Standard_Real& Psol, math_Vector& ParSol);
+  Standard_EXPORT Standard_Boolean PerformFirstSection (Blend_Function& F, Blend_FuncInv& FInv, const Standard_Real Pdep, const Standard_Real Pmax, const math_Vector& ParDep, const Standard_Real Tol3d, const Standard_Real TolGuide, const Standard_Boolean RecOnS1, const Standard_Boolean RecOnS2, Standard_Real& Psol, math_Vector& ParSol);
   
   Standard_EXPORT Standard_Boolean Continu (Blend_Function& F, Blend_FuncInv& FInv, const Standard_Real P);
   
@@ -131,7 +131,7 @@ private:
   Standard_Boolean ToCorrectOnRst1;
   Standard_Boolean ToCorrectOnRst2;
   Standard_Real CorrectedParam;
-  Standard_Real tolesp;
+  Standard_Real tolpoint3d;
   Standard_Real tolgui;
   Standard_Real pasmax;
   Standard_Real fleche;

src/BRepClass/BRepClass_Intersector.cxx

@@ -197,10 +197,12 @@ Standard_Boolean CheckOn(IntRes2d_IntersectionPoint& thePntInter,
     if (aMinDist <= theTolZ) {
       IntRes2d_Transition aTrOnLin(IntRes2d_Head);
       IntRes2d_Position aPosOnCurve = IntRes2d_Middle;
-      if (Abs(aPar - theDeb) <= Precision::Confusion()) {
+      if ((Abs(aPar - theDeb) <= Precision::Confusion())
+        || (aPar < theDeb)) {
         aPosOnCurve = IntRes2d_Head;
       }
-      else if (Abs(aPar - theFin) <= Precision::Confusion()) {
+      else if ((Abs(aPar - theFin) <= Precision::Confusion()) 
+        || (aPar > theFin)) {
         aPosOnCurve = IntRes2d_End;
       }
       //
@@ -381,8 +383,16 @@ void  BRepClass_Intersector::Perform(const gp_Lin2d& L,
   {
     Standard_Boolean aStatusOn = Standard_False;
     IntRes2d_IntersectionPoint aPntInter;
+    Standard_Real aDebTol = deb;
+    Standard_Real aFinTol = fin;
+    if (aTolZ > Precision::Confusion())
+    {
+      aDebTol = deb - aTolZ;
+      aFinTol = fin + aTolZ;
+    }
+    Geom2dAdaptor_Curve aCurAdaptor(aC2D, aDebTol, aFinTol);
 
-    aStatusOn = CheckOn(aPntInter, F, L, C, aTolZ, fin, deb);
+    aStatusOn = CheckOn(aPntInter, F, L, aCurAdaptor, aTolZ, fin, deb);
     if (aStatusOn)
     {
       Append(aPntInter);

src/BRepExtrema/BRepExtrema_DistanceSS.cxx

@@ -468,7 +468,14 @@ static void PERFORM_C0(const TopoDS_Edge& S1, const TopoDS_Edge& S2,
               if (fabs(Dstmin - sqrt(Ext.SquareDistance(ii))) < Eps)
               {
                 Pt = Ext.Point(ii);
-                if (TRI_SOLUTION(SeqSol2, Pt))
+                // Pt - point on the curve pCurvOther/Eother, but
+                // if iE == 0 -> Eother correspond to edge S2
+                // and to edge S1 in the opposite case.
+                // Therefore we should search Pt through previous solution points on Other curve (edge):
+                // if iE == 0 - on edge S2, namely through SeqSol2,
+                // else       - on edge S1, namely through SeqSol1.
+                const bool triSolutionResult = (iE == 0) ? TRI_SOLUTION(SeqSol2, Pt) : TRI_SOLUTION(SeqSol1, Pt);
+                if (triSolutionResult)
                 {
                   // Check if the parameter does not correspond to a vertex
                   const Standard_Real t = Ext.Parameter(ii);
@@ -869,9 +876,19 @@ void BRepExtrema_DistanceSS::Perform (const TopoDS_Edge& theS1,
 
   if (!seqSol1.IsEmpty() && !seqSol2.IsEmpty())
   {
-    theSeqSolShape1.Append(seqSol1);
-    theSeqSolShape2.Append(seqSol2);
-    myModif = Standard_True;
+    BRepExtrema_SeqOfSolution::iterator anIt1 = seqSol1.begin();
+    BRepExtrema_SeqOfSolution::iterator anIt2 = seqSol2.begin();
+    for (; anIt1 != seqSol1.end() && anIt2 != seqSol2.end(); anIt1++, anIt2++)
+    {
+      gp_Pnt Pt1 = anIt1->Point();
+      gp_Pnt Pt2 = anIt2->Point();
+      if (TRI_SOLUTION(theSeqSolShape1, Pt1) || TRI_SOLUTION(theSeqSolShape2, Pt2))
+      {
+        theSeqSolShape1.Append(*anIt1);
+        theSeqSolShape2.Append(*anIt2);
+        myModif = Standard_True;
+      }
+    }
   }
 }
 

src/BRepExtrema/BRepExtrema_ProximityDistTool.cxx

@@ -0,0 +1,517 @@
+// Created on: 2022-08-08
+// Created by: Kseniya NOSULKO
+// Copyright (c) 2022 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#include <BRepExtrema_ProximityDistTool.hxx>
+
+#include <BRepAdaptor_Surface.hxx>
+#include <BRep_Tool.hxx>
+#include <gp_Pln.hxx>
+#include <Precision.hxx>
+#include <Poly_Connect.hxx>
+#include <Standard_NullValue.hxx>
+#include <TopoDS.hxx>
+
+//=======================================================================
+//function : BRepExtrema_ProximityDistTool
+//purpose  : Creates new unitialized tool
+//=======================================================================
+BRepExtrema_ProximityDistTool::BRepExtrema_ProximityDistTool()
+: myMinDistance (std::numeric_limits<Standard_Real>::max()),
+  myProxDist (-1.),
+  myPntStatus1 (ProxPnt_Status_UNKNOWN),
+  myPntStatus2 (ProxPnt_Status_UNKNOWN),
+  myNbSamples1 (0),
+  myProxVtxIdx1 (-1)
+{
+}
+
+//=======================================================================
+//function : BRepExtrema_ProximityDistTool
+//purpose  : Creates new tool for the given element sets
+//=======================================================================
+BRepExtrema_ProximityDistTool::BRepExtrema_ProximityDistTool (const Handle(BRepExtrema_TriangleSet)& theSet1,
+                                                              const Standard_Integer theNbSamples1,
+                                                              const BVH_Array3d& theAddVertices1,
+                                                              const NCollection_Vector<ProxPnt_Status>& theAddStatus1,
+                                                              const Handle(BRepExtrema_TriangleSet)& theSet2,
+                                                              const BRepExtrema_ShapeList& theShapeList1,
+                                                              const BRepExtrema_ShapeList& theShapeList2)
+: myMinDistance (std::numeric_limits<Standard_Real>::max()),
+  myProxDist (-1.),
+  myPntStatus1 (ProxPnt_Status_UNKNOWN),
+  myPntStatus2 (ProxPnt_Status_UNKNOWN),
+  myNbSamples1 (theNbSamples1),
+  myProxVtxIdx1 (-1)
+{
+  LoadTriangleSets (theSet1, theSet2);
+  LoadShapeLists (theShapeList1, theShapeList2);
+  LoadAdditionalPointsFirstSet (theAddVertices1, theAddStatus1);
+}
+
+//=======================================================================
+//function : LoadTriangleSets
+//purpose  : Loads the given element sets into the tool
+//=======================================================================
+void BRepExtrema_ProximityDistTool::LoadTriangleSets (const Handle(BRepExtrema_TriangleSet)& theSet1,
+                                                      const Handle(BRepExtrema_TriangleSet)& theSet2)
+{
+  mySet1 = theSet1;
+  mySet2 = theSet2;
+}
+
+//=======================================================================
+//function : LoadShapeLists
+//purpose  : Loads the given list of subshapes into the proximity tool
+//=======================================================================
+void BRepExtrema_ProximityDistTool::LoadShapeLists (const BRepExtrema_ShapeList& theShapeList1,
+                                                    const BRepExtrema_ShapeList& theShapeList2)
+{
+  myShapeList1 = theShapeList1;
+  myShapeList2 = theShapeList2;
+}
+
+//=======================================================================
+//function : LoadAdditionalPointsFirstSet
+//purpose  : Loads given additional vertices and their statuses
+//=======================================================================
+void BRepExtrema_ProximityDistTool::LoadAdditionalPointsFirstSet (const BVH_Array3d& theAddVertices1,
+                                                                  const NCollection_Vector<ProxPnt_Status>& theAddStatus1)
+{
+  myAddVertices1 = theAddVertices1;
+  myAddStatus1 = theAddStatus1;
+}
+
+//=======================================================================
+//function : goThroughtSet1
+//purpose  : Goes throught vertices from the 1st set
+//=======================================================================
+void BRepExtrema_ProximityDistTool::goThroughtSet1 (const BVH_Array3d& theVertices1,
+                                                    const Standard_Boolean theIsAdditionalSet)
+{
+  Standard_Integer aVtxSize = (Standard_Integer)theVertices1.size();
+  Standard_Integer aVtxStep = Max (myNbSamples1 <= 0 ? 1 : aVtxSize / myNbSamples1, 1);
+  for (Standard_Integer aVtxIdx = 0; aVtxIdx < aVtxSize; aVtxIdx += aVtxStep)
+  {
+    myDistance = std::numeric_limits<Standard_Real>::max();
+    myMinDistance = std::numeric_limits<Standard_Real>::max();
+    myIsDone = Standard_False;
+    SetObject (theVertices1[aVtxIdx]);
+
+    ComputeDistance();
+
+    if (!IsDone() && myProxDist < 0.) return;
+
+    if (IsDone() && myDistance > myProxDist)
+    {
+      myPnt1 = theVertices1[aVtxIdx];
+      myPnt2 = myExtremaPoint;
+      myProxDist = myDistance;
+      myProxVtxIdx1 = aVtxIdx;
+      myIsProxVtx1FromAddSet = theIsAdditionalSet;
+      myProxPrjState = myExtPrjState;
+    }
+  }
+}
+
+//=======================================================================
+//function : Perform
+//purpose  : Performs searching of the proximity distance
+//=======================================================================
+void BRepExtrema_ProximityDistTool::Perform()
+{
+  SetBVHSet (mySet2.get());
+  goThroughtSet1 (mySet1->GetVertices(), Standard_False);
+  goThroughtSet1 (myAddVertices1, Standard_True);
+
+  myIsDone = myProxDist > -1.;
+  if (myIsDone)
+  {
+    DefineStatusProxPnt();
+  }
+}
+
+static Standard_Real pointBoxSquareMaxDistance (const BVH_Vec3d& thePoint,
+                                                const BVH_Vec3d& theCMin,
+                                                const BVH_Vec3d& theCMax)
+{
+  Standard_Real aDist = 0;
+  for (int i = 0; i < 3; ++i)
+  {
+    if (thePoint[i] <= 0.5 * (theCMax[i] + theCMin[i])) { Standard_Real d = theCMax[i] - thePoint[i]; d *= d; aDist += d; }
+    else { Standard_Real d = thePoint[i] - theCMin[i]; d *= d; aDist += d; }
+  }
+  return aDist;
+}
+
+//=======================================================================
+//function : Branch rejection
+//purpose  : Defines the rules for node rejection by bounding box
+//=======================================================================
+Standard_Boolean BRepExtrema_ProximityDistTool::RejectNode (const BVH_Vec3d& theCornerMin,
+                                                            const BVH_Vec3d& theCornerMax,
+                                                            Standard_Real& theMetric) const
+{
+  theMetric = sqrt (BVH_Tools<Standard_Real, 3>::PointBoxSquareDistance (myObject,
+                                                                         theCornerMin,
+                                                                         theCornerMax));
+
+  Standard_Real aMaxMetric = sqrt (pointBoxSquareMaxDistance (myObject,
+                                                              theCornerMin,
+                                                              theCornerMax));
+
+  return theMetric > myDistance || aMaxMetric < myProxDist;
+}
+
+//=======================================================================
+//function : Leaf acceptance
+//purpose  : Defines the rules for leaf acceptance
+//=======================================================================
+Standard_Boolean BRepExtrema_ProximityDistTool::Accept (const Standard_Integer theTrgIdx,
+                                                        const Standard_Real&)
+{
+  BVH_Vec3d aTrgVert1;
+  BVH_Vec3d aTrgVert2;
+  BVH_Vec3d aTrgVert3;
+
+  BVH_PrjState aBVH_PrjState;
+  Standard_Integer aNumberOfFirstNode = -1;
+  Standard_Integer aNumberOfLastNode = -1;
+
+  mySet2->GetVertices (theTrgIdx, aTrgVert1, aTrgVert2, aTrgVert3);
+
+  BVH_Vec3d aNearestPnt = BVH_Tools<Standard_Real, 3>::PointTriangleProjection (myObject,
+                                                                                aTrgVert1, aTrgVert2, aTrgVert3,
+                                                                                &aBVH_PrjState,
+                                                                                &aNumberOfFirstNode, &aNumberOfLastNode);
+
+  PrjState aPrjState (theTrgIdx, aBVH_PrjState, aNumberOfFirstNode, aNumberOfLastNode);
+  BVH_Vec3d aDirect = myObject - aNearestPnt;
+  Standard_Real aSqDistance = aDirect.Dot(aDirect);
+
+  if (aSqDistance > Precision::SquareConfusion()) // point belongs to triangle
+  {
+    const BVH_Vec3d aAB = aTrgVert2 - aTrgVert1;
+
+    BVH_Vec3d aNorm;
+    if (aTrgVert2.IsEqual (aTrgVert3)) // is this degenerate triangle (= segment)
+    {
+      const BVH_Vec3d aAP = myObject - aTrgVert1;
+      aNorm = BVH_Vec3d::Cross (BVH_Vec3d::Cross (aAP, aAB), aAB);
+    }
+    else
+    {
+      const BVH_Vec3d aAC = aTrgVert3 - aTrgVert1;
+      aNorm = BVH_Vec3d::Cross (aAB, aAC);
+    }
+
+    Standard_Real aNormSqLen = aNorm.Dot (aNorm);
+
+    // check if the distance is under perpendicular
+    const BVH_Vec3d aCrossCross = BVH_Vec3d::Cross (aDirect, aNorm);
+    Standard_Real aCrossCrossSqLen = aCrossCross.Dot (aCrossCross);
+    if (aCrossCrossSqLen > Precision::SquareConfusion() * aSqDistance * aNormSqLen)
+    {
+      // the distance is not under perpendicular
+      if (myMinDistance - sqrt (aSqDistance) > Precision::Confusion())
+      {
+        myMinDistance = sqrt (aSqDistance);
+        myMinDistPoint = aNearestPnt;
+        myMinPrjState = aPrjState;
+      }
+
+      return Standard_False;
+    }
+  }
+
+  // the distance is under perpendicular
+  if (myDistance - sqrt (aSqDistance) > Precision::Confusion())
+  {
+    myDistance = sqrt (aSqDistance);
+    myExtremaPoint = aNearestPnt;
+    myExtPrjState = aPrjState;
+
+    return Standard_True;
+  }
+
+  return Standard_False;
+}
+
+//=======================================================================
+//function : ComputeDistance
+//purpose  : Computes the distance between object and BVH tree
+//=======================================================================
+Standard_Real BRepExtrema_ProximityDistTool::ComputeDistance()
+{
+  myIsDone = this->Select() > 0;
+
+  if (!myIsDone)
+  {
+    if (myMinDistance < std::numeric_limits<Standard_Real>::max())
+    {
+      myExtremaPoint = myMinDistPoint;
+      myExtPrjState = myMinPrjState;
+      myIsDone = true;
+    }
+
+    myDistance = myMinDistance;
+  }
+
+  return myDistance;
+}
+
+//=======================================================================
+//function : IsNodeOnBorder
+//purpose  : Returns true if the node is on the boarder
+//=======================================================================
+Standard_Boolean BRepExtrema_ProximityDistTool::IsNodeOnBorder (const Standard_Integer theNodeIdx,
+                                                                const Handle(Poly_Triangulation)& theTr)
+{
+  Poly_Connect aPolyConnect (theTr);
+
+  Standard_Integer aContTrg; //index of triangle containing exploring node
+  for (aPolyConnect.Initialize (theNodeIdx); aPolyConnect.More(); aPolyConnect.Next())
+  {
+    aContTrg = aPolyConnect.Value();
+
+    Standard_Integer aContTrgNodes[3];
+    theTr->Triangle (aContTrg).Get (aContTrgNodes[0], aContTrgNodes[1], aContTrgNodes[2]); //indices of nodes of the triangle
+
+    Standard_Integer aAdjTrg[3];
+    aPolyConnect.Triangles (aContTrg, aAdjTrg[0], aAdjTrg[1], aAdjTrg[2]); //indices of adjacent triangles
+  
+    for (Standard_Integer j = 0; j < 3; j++)
+    {
+      Standard_Integer k = (j + 1) % 3;
+      if (aAdjTrg[j] == 0) //free segment of triangle
+      {
+        //aContTrgNodes[j], aContTrgNodes[k] are ends of free segment and it is a part of border
+        if (aContTrgNodes[j] == theNodeIdx || aContTrgNodes[k] == theNodeIdx)
+        {
+          return Standard_True;
+        }
+      }
+    }
+  }
+
+  return Standard_False;
+}
+
+//=======================================================================
+//function : IsEdgeOnBorder
+//purpose  : Returns true if the edge is on the boarder
+//=======================================================================
+Standard_Boolean BRepExtrema_ProximityDistTool::IsEdgeOnBorder (const Standard_Integer theTrgIdx,
+                                                                const Standard_Integer theFirstEdgeNodeIdx,
+                                                                const Standard_Integer theSecondEdgeNodeIdx,
+                                                                const Handle(Poly_Triangulation)& theTr)
+{
+  Poly_Connect aPolyConnect (theTr);
+
+  Standard_Integer aAdjTrg[3];
+  aPolyConnect.Triangles (theTrgIdx, aAdjTrg[0], aAdjTrg[1], aAdjTrg[2]); //indices of adjacent triangles
+
+  for (Standard_Integer j = 0; j < 3; j++)
+  {
+    Standard_Integer k = (j + 1) % 3;
+    if (aAdjTrg[j] == 0) //free segment of triangle
+    {
+      //are ends of free segment and it is a part of border
+      if (j == theFirstEdgeNodeIdx &&
+          k == theSecondEdgeNodeIdx)
+      {
+        return Standard_True;
+      }
+    }
+  }
+
+  return Standard_False;
+}
+
+//=======================================================================
+//function : defineStatusProxPnt1
+//purpose  : Defines the status of proximity point from 1st BVH
+//=======================================================================
+void BRepExtrema_ProximityDistTool::defineStatusProxPnt1()
+{
+  if (myIsProxVtx1FromAddSet)
+  {
+    myPntStatus1 = myAddStatus1[myProxVtxIdx1];
+    return;
+  }
+
+  Standard_Integer aFaceID1 = mySet1->GetShapeIDOfVtx (myProxVtxIdx1);
+
+  if (myShapeList1 (aFaceID1).ShapeType() == TopAbs_EDGE)
+  {
+    const BVH_Array3d& aVertices1 = mySet1->GetVertices();
+    Standard_Integer aVtxSize = (Standard_Integer)aVertices1.size();
+    Standard_Integer aLastIdx = aVtxSize - 1;
+
+    if ((aVertices1[0] - aVertices1[aLastIdx]).Modulus() < Precision::Confusion()) // if closed
+    {
+      myPntStatus1 = ProxPnt_Status_MIDDLE;
+      return;
+    }
+
+    if (myProxVtxIdx1 == 0 || myProxVtxIdx1 == aLastIdx)
+    {
+      myPntStatus1 = ProxPnt_Status_BORDER;
+    }
+    else
+    {
+      myPntStatus1 = ProxPnt_Status_MIDDLE;
+    }
+  }
+  else if (myShapeList1 (aFaceID1).ShapeType() == TopAbs_FACE)
+  {
+    Standard_Integer aNodeIdx = mySet1->GetVtxIdxInShape (myProxVtxIdx1) + 1;
+
+    TopLoc_Location aLocation;
+    const TopoDS_Face& aF = TopoDS::Face (myShapeList1 (aFaceID1));
+    Handle(Poly_Triangulation) aTr = BRep_Tool::Triangulation (aF, aLocation);
+
+    if (IsNodeOnBorder (aNodeIdx, aTr))
+    {
+      myPntStatus1 = ProxPnt_Status_BORDER;
+    }
+    else
+    {
+      myPntStatus1 = ProxPnt_Status_MIDDLE;
+    }
+  }
+}
+
+//=======================================================================
+//function : defineStatusProxPnt2
+//purpose  : Defines the status of proximity point from 2nd BVH
+//=======================================================================
+void BRepExtrema_ProximityDistTool::defineStatusProxPnt2()
+{
+  Standard_Integer aTrgIdx = myProxPrjState.GetTrgIdx();
+  Standard_Integer aFaceID2 = mySet2->GetFaceID (aTrgIdx);
+
+  if (myShapeList2 (aFaceID2).ShapeType() == TopAbs_EDGE)
+  {
+    if (myProxPrjState.GetPrjState() == BVH_PrjState::BVH_PrjStateInTriangle_INNER)
+    {
+      return;
+    }
+    else
+    {
+      const BVH_Array3d& aVertices2 = mySet2->GetVertices();
+      Standard_Integer aVtxSize = (Standard_Integer)aVertices2.size();
+      Standard_Integer aLastIdx = aVtxSize - 1;
+
+      if ((aVertices2[0] - aVertices2[aLastIdx]).Modulus() < Precision::Confusion()) // if closed
+      {
+        myPntStatus2 = ProxPnt_Status_MIDDLE;
+        return;
+      }
+
+      NCollection_Array1<Standard_Integer> aVtxIndicesOfTrg;
+      mySet2->GetVtxIndices (aTrgIdx, aVtxIndicesOfTrg);
+
+      Standard_Integer aFirstNodeNum = myProxPrjState.GetNumberOfFirstNode();
+      Standard_Integer aFirstVtxIdx = aVtxIndicesOfTrg[aFirstNodeNum];
+
+      if (myProxPrjState.GetPrjState() == BVH_PrjState::BVH_PrjStateInTriangle_VERTEX)
+      {
+        if (aFirstVtxIdx == 0 || aFirstVtxIdx == aLastIdx)
+        {
+          myPntStatus2 = ProxPnt_Status_BORDER;
+        }
+        else
+        {
+          myPntStatus2 = ProxPnt_Status_MIDDLE;
+        }
+      }
+      else if (myProxPrjState.GetPrjState() == BVH_PrjState::BVH_PrjStateInTriangle_EDGE)
+      {
+        Standard_Integer aLastNodeNum = myProxPrjState.GetNumberOfLastNode();
+        Standard_Integer aLastVtxIdx = aVtxIndicesOfTrg[aLastNodeNum];
+
+        // it could be border only in case projection is on a degenerated edge
+        if (aFirstVtxIdx == aLastVtxIdx && (aFirstVtxIdx == 0 || aFirstVtxIdx == aLastIdx))
+        {
+          myPntStatus2 = ProxPnt_Status_BORDER;
+        }
+        else
+        {
+          myPntStatus2 = ProxPnt_Status_MIDDLE;
+        }
+      }
+    }
+  }
+  else if (myShapeList2 (aFaceID2).ShapeType() == TopAbs_FACE)
+  {
+    if (myProxPrjState.GetPrjState() == BVH_PrjState::BVH_PrjStateInTriangle_INNER)
+    {
+      myPntStatus2 = ProxPnt_Status_MIDDLE;
+    }
+    else
+    {
+      TopLoc_Location aLocation;
+      const TopoDS_Face& aF = TopoDS::Face (myShapeList2 (aFaceID2));
+      Handle(Poly_Triangulation) aTr = BRep_Tool::Triangulation (aF, aLocation);
+
+      NCollection_Array1<Standard_Integer> aVtxIndicesOfTrg;
+      mySet2->GetVtxIndices (aTrgIdx, aVtxIndicesOfTrg);
+
+      if (myProxPrjState.GetPrjState() == BVH_PrjState::BVH_PrjStateInTriangle_VERTEX)
+      {
+        Standard_Integer aNodeNum = myProxPrjState.GetNumberOfFirstNode();
+        Standard_Integer aNodeIdx = mySet2->GetVtxIdxInShape (aVtxIndicesOfTrg[aNodeNum]) + 1;
+
+        if (IsNodeOnBorder (aNodeIdx, aTr))
+        {
+          myPntStatus2 = ProxPnt_Status_BORDER;
+        }
+        else
+        {
+          myPntStatus2 = ProxPnt_Status_MIDDLE;
+        }
+      }
+      else if (myProxPrjState.GetPrjState() == BVH_PrjState::BVH_PrjStateInTriangle_EDGE)
+      {
+        Standard_Integer aTrgIdxInShape = mySet2->GetTrgIdxInShape (aTrgIdx) + 1;
+
+        if (IsEdgeOnBorder (aTrgIdxInShape,
+                            myProxPrjState.GetNumberOfFirstNode(),
+                            myProxPrjState.GetNumberOfLastNode(),
+                            aTr))
+        {
+          myPntStatus2 = ProxPnt_Status_BORDER;
+        }
+        else
+        {
+          myPntStatus2 = ProxPnt_Status_MIDDLE;
+        }
+      } //else if (myProxPrjState.GetPrjState() == BVH_PrjState::BVH_PrjStateInTriangle_EDGE)
+    }
+  } //else if (myShapeList1 (aFaceID1).ShapeType() == TopAbs_FACE)
+}
+
+//=======================================================================
+//function : DefineStatusProxPnt
+//purpose  : Defines the status of proximity points
+//=======================================================================
+void BRepExtrema_ProximityDistTool::DefineStatusProxPnt()
+{
+  // define the status of proximity point from 1st BVH
+  defineStatusProxPnt1();
+
+  // define the status of proximity point from 2nd BVH
+  defineStatusProxPnt2();
+}

src/BRepExtrema/BRepExtrema_ProximityDistTool.hxx

@@ -0,0 +1,230 @@
+// Created on: 2022-08-08
+// Created by: Kseniya NOSULKO
+// Copyright (c) 2022 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#ifndef _BRepExtrema_ProximityDistTool_HeaderFile
+#define _BRepExtrema_ProximityDistTool_HeaderFile
+
+#include <BRepExtrema_ElementFilter.hxx>
+#include <BRepExtrema_MapOfIntegerPackedMapOfInteger.hxx>
+#include <BRepExtrema_TriangleSet.hxx>
+#include <BVH_Distance.hxx>
+#include <BVH_Tools.hxx>
+#include <Poly_Triangulation.hxx>
+
+//! Tool class for computation the proximity distance from first 
+//! primitive set to second one that is the maximal from minimum 
+//! perpendicular distances. If no perpendicular distance is found, the 
+//! minimum distance will be returned.
+//! This tool is not intended to be used independently, and is integrated
+//! in other classes, implementing algorithms based on shape tessellation
+//! (BRepExtrema_ProximityValueTool).
+//! 
+//! Please note that algorithm results are approximate and depend greatly
+//! on the quality of input tessellation(s).
+class BRepExtrema_ProximityDistTool : public BVH_Distance <Standard_Real, 3, BVH_Vec3d, 
+                                                           BRepExtrema_TriangleSet>
+{
+public:
+
+  typedef typename BVH_Tools<Standard_Real, 3>::BVH_PrjStateInTriangle BVH_PrjState;
+
+  enum ProxPnt_Status
+  {
+    ProxPnt_Status_BORDER,
+    ProxPnt_Status_MIDDLE,
+    ProxPnt_Status_UNKNOWN
+  };
+
+public:
+
+  //! Struct with information about projection point state from 2nd BVH,
+  //! providing proximity point of 2nd shape
+  struct PrjState
+  {
+    PrjState()
+    : myTrgIdx (0),
+      myPrjState (BVH_PrjState::BVH_PrjStateInTriangle_INNER),
+      myNumberOfFirstNode (0),
+      myNumberOfLastNode (0)
+    {}
+
+    PrjState (const Standard_Integer theTrgIdx,
+              const BVH_PrjState     thePrjState,
+              const Standard_Integer theNumberOfFirstNode,
+              const Standard_Integer theNumberOfLastNode)
+    : myTrgIdx (theTrgIdx),
+      myPrjState (thePrjState),
+      myNumberOfFirstNode (theNumberOfFirstNode),
+      myNumberOfLastNode (theNumberOfLastNode)
+    {}
+
+    Standard_Integer GetTrgIdx() const { return myTrgIdx; }
+
+    BVH_PrjState GetPrjState() const { return myPrjState; }
+
+    Standard_Integer GetNumberOfFirstNode() const { return myNumberOfFirstNode; }
+
+    Standard_Integer GetNumberOfLastNode() const { return myNumberOfLastNode; }
+
+  private:
+
+    Standard_Integer myTrgIdx; //!< Index of triangle on which the projection is located
+    BVH_PrjState myPrjState; //!< Position of a projection on the triangle (vertex, edge, inner)
+    Standard_Integer myNumberOfFirstNode; //!< The 1st vtx of the triangle edge on which the projection is located
+    Standard_Integer myNumberOfLastNode; //!< The 2nd vtx of the triangle edge on which the projection is located
+  };
+
+public:
+
+  //! Creates new unitialized tool.
+  Standard_EXPORT BRepExtrema_ProximityDistTool();
+
+  //! Creates new tool for the given element sets.
+  Standard_EXPORT BRepExtrema_ProximityDistTool (const Handle(BRepExtrema_TriangleSet)& theSet1,
+                                                 const Standard_Integer theNbSamples1,
+                                                 const BVH_Array3d& theAddVertices1,
+                                                 const NCollection_Vector<ProxPnt_Status>& theAddStatus1,
+                                                 const Handle(BRepExtrema_TriangleSet)& theSet2,
+                                                 const BRepExtrema_ShapeList& theShapeList1,
+                                                 const BRepExtrema_ShapeList& theShapeList2);
+
+public:
+
+  //! Loads the given element sets into the tool.
+  Standard_EXPORT void LoadTriangleSets (const Handle(BRepExtrema_TriangleSet)& theSet1,
+                                         const Handle(BRepExtrema_TriangleSet)& theSet2);
+
+  //! Loads the given list of subshapes into the tool.
+  Standard_EXPORT void LoadShapeLists (const BRepExtrema_ShapeList& theShapeList1,
+                                       const BRepExtrema_ShapeList& theShapeList2);
+
+  //! Loads given additional vertices and their statuses.
+  void LoadAdditionalPointsFirstSet (const BVH_Array3d& theAddVertices1,
+                                     const NCollection_Vector<ProxPnt_Status>& theAddStatus1);
+
+  //! Performs searching of the proximity distance.
+  Standard_EXPORT void Perform();
+
+public: //! @name Reject/Accept implementations
+
+  //! Defines the rules for node rejection by bounding box.
+  Standard_EXPORT virtual Standard_Boolean RejectNode (const BVH_Vec3d& theCornerMin,
+                                                       const BVH_Vec3d& theCornerMax,
+                                                       Standard_Real& theMetric) const Standard_OVERRIDE;
+
+  //! Defines the rules for leaf acceptance.
+  Standard_EXPORT virtual Standard_Boolean Accept (const Standard_Integer theSgmIdx,
+                                                   const Standard_Real&) Standard_OVERRIDE;
+
+public:
+
+  //! Returns true if the node is on the boarder.
+  Standard_EXPORT static Standard_Boolean IsNodeOnBorder (const Standard_Integer theNodeIdx,
+                                                          const Handle (Poly_Triangulation)& theTr);
+
+  //! Returns true if the edge is on the boarder.
+  Standard_EXPORT static Standard_Boolean IsEdgeOnBorder (const Standard_Integer theTrgIdx,
+                                                          const Standard_Integer theFirstEdgeNodeIdx,
+                                                          const Standard_Integer theSecondEdgeNodeIdx,
+                                                          const Handle (Poly_Triangulation)& theTr);
+
+public:
+
+  //! Returns points on triangles sets, which provide the proximity distance.
+  void ProximityPoints (BVH_Vec3d& thePoint1, BVH_Vec3d& thePoint2) const
+  {
+    thePoint1 = myPnt1;
+    thePoint2 = myPnt2;
+  }
+
+  //! Returns status of points on triangles sets, which provide the proximity distance.
+  void ProximityPointsStatus (ProxPnt_Status& thePointStatus1, ProxPnt_Status& thePointStatus2) const
+  {
+    thePointStatus1 = myPntStatus1;
+    thePointStatus2 = myPntStatus2;
+  }
+
+  //! Returns the computed distance
+  Standard_Real ProximityDistance() const { return myProxDist; }
+
+protected:
+
+  //! Computes the distance between object and BVH tree.
+  Standard_EXPORT Standard_Real ComputeDistance();
+
+  //! Defines the status of proximity points.
+  Standard_EXPORT void DefineStatusProxPnt();
+
+private:
+
+  //! Goes throught vertices from the 1st set.
+  void goThroughtSet1 (const BVH_Array3d& aVertices1,
+                       const Standard_Boolean theIsAdditionalSet);
+
+  //! Defines the status of proximity point from 1st BVH.
+  void defineStatusProxPnt1();
+
+  //! Defines the status of proximity point from 2nd BVH.
+  void defineStatusProxPnt2();
+
+protected:
+
+  Standard_Real myMinDistance; //!< Minimal distance from point to BVH, could be not equal to myDistance
+  BVH_Vec3d myMinDistPoint; //!< Point on BVH providing the minimal distance
+
+  BVH_Vec3d myExtremaPoint; //!< Point on BVH providing the extrema
+
+  Standard_Real myProxDist; //!< Proximity distance
+
+  //! Proximity points
+  BVH_Vec3d myPnt1, myPnt2;
+
+  //! Proximity points' status
+  ProxPnt_Status myPntStatus1, myPntStatus2;
+
+private:
+
+  //! Set of all mesh elements (triangles) of the 1st shape.
+  Handle(BRepExtrema_TriangleSet) mySet1;
+  //! Set of all mesh elements (triangles) of the 2nd shape.
+  Handle(BRepExtrema_TriangleSet) mySet2;
+
+  //! List of subshapes of the 1st shape.
+  BRepExtrema_ShapeList myShapeList1;
+  //! List of subshapes of the 2nd shape.
+  BRepExtrema_ShapeList myShapeList2;
+
+  Standard_Integer myNbSamples1; //!< Number of samples points on the first shape
+
+  //! Is vertex corresponding to proximity point of 1st shape from additional set
+  Standard_Integer myIsProxVtx1FromAddSet;
+  BVH_Array3d myAddVertices1; //!< Additional vertices on the 1st shape
+  NCollection_Vector<ProxPnt_Status> myAddStatus1; //!< Status of additional vertices on the 1st shape
+
+  //! Vertex index from 1st BVH corresponding to proximity point of 1st shape
+  Standard_Integer myProxVtxIdx1;
+
+  //! Information of projection point state from 2nd BVH providing proximity point of 2nd shape
+  PrjState myProxPrjState;
+
+  //! Information of projection point state from 2nd BVH providing the extrema
+  PrjState myExtPrjState;
+
+  //! Information of projection point state from 2nd BVH providing the minimal distance
+  PrjState myMinPrjState;
+
+};
+
+#endif // _BRepExtrema_ProximityDistTool_HeaderFile

src/BRepExtrema/BRepExtrema_ProximityValueTool.cxx

@@ -0,0 +1,587 @@
+// Created on: 2022-08-08
+// Created by: Kseniya NOSULKO
+// Copyright (c) 2022 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#include <BRepExtrema_ProximityValueTool.hxx>
+#include <BRepExtrema_ProximityDistTool.hxx>
+
+#include <BRep_Tool.hxx>
+#include <BRepAdaptor_Curve.hxx>
+#include <BRepGProp.hxx>
+#include <GCPnts_AbscissaPoint.hxx>
+#include <GCPnts_QuasiUniformAbscissa.hxx>
+#include <GProp_GProps.hxx> 
+#include <Poly_Connect.hxx>
+#include <TopoDS.hxx>
+
+//=======================================================================
+//function : BRepExtrema_ProximityValueTool
+//purpose  : Creates new unitialized proximity tool
+//=======================================================================
+BRepExtrema_ProximityValueTool::BRepExtrema_ProximityValueTool()
+: myIsRefinementRequired1 (Standard_False),
+  myIsRefinementRequired2 (Standard_False),
+  myDistance (std::numeric_limits<Standard_Real>::max()),
+  myIsDone (Standard_False),
+  myNbSamples1(0),
+  myNbSamples2(0)
+{
+  // Should be initialized later
+  myIsInitS1 = myIsInitS2 = Standard_False;
+}
+
+//=======================================================================
+//function : BRepExtrema_ProximityValueTool
+//purpose  : Creates new proximity tool for the given element sets
+//=======================================================================
+BRepExtrema_ProximityValueTool::BRepExtrema_ProximityValueTool (const Handle(BRepExtrema_TriangleSet)& theSet1,
+                                                                const Handle(BRepExtrema_TriangleSet)& theSet2,
+                                                                const BRepExtrema_ShapeList& theShapeList1,
+                                                                const BRepExtrema_ShapeList& theShapeList2)
+: myIsRefinementRequired1 (Standard_False),
+  myIsRefinementRequired2 (Standard_False),
+  myDistance (std::numeric_limits<Standard_Real>::max()),
+  myIsDone (Standard_False),
+  myNbSamples1 (0),
+  myNbSamples2 (0)
+{
+  LoadShapeLists (theShapeList1, theShapeList2);
+  LoadTriangleSets (theSet1, theSet2);
+}
+
+//=======================================================================
+//function : LoadTriangleSets
+//purpose  : Loads the given element sets into the proximity tool
+//=======================================================================
+void BRepExtrema_ProximityValueTool::LoadTriangleSets (const Handle(BRepExtrema_TriangleSet)& theSet1,
+                                                       const Handle(BRepExtrema_TriangleSet)& theSet2)
+{
+  mySet1 = theSet1;
+  mySet2 = theSet2;
+
+  MarkDirty();
+}
+
+//=======================================================================
+//function : calcEdgeRefinementStep
+//purpose  : Calculates the edge refinement step
+//=======================================================================
+static Standard_Real calcEdgeRefinementStep (const TopoDS_Edge& theEdge,
+                                             const Standard_Integer theNbNodes)
+{
+  if (theNbNodes < 2)
+    return 0;
+
+  BRepAdaptor_Curve aBAC (theEdge);
+  Standard_Real aLen = GCPnts_AbscissaPoint::Length (aBAC);
+  return aLen / (Standard_Real)(theNbNodes - 1);
+}
+
+//=======================================================================
+//function : calcFaceRefinementStep
+//purpose  : Calculates the face refinement step as an approximate square
+// (Shape area / number triangles) * 2
+//=======================================================================
+static Standard_Real calcFaceRefinementStep (const TopoDS_Face& theFace,
+                                             const Standard_Integer theNbTrg)
+{
+  if (theNbTrg < 1)
+    return 0;
+
+  GProp_GProps props;
+  BRepGProp::SurfaceProperties (theFace, props);
+  Standard_Real aArea = props.Mass();
+  return 2 * (aArea / (Standard_Real)theNbTrg);
+}
+
+//=======================================================================
+//function : getInfoForRefinement
+//purpose  : Gets shape data for further refinement
+//=======================================================================
+Standard_Boolean BRepExtrema_ProximityValueTool::getInfoForRefinement (const TopoDS_Shape& theShape,
+                                                                       TopAbs_ShapeEnum& theShapeType,
+                                                                       Standard_Integer& theNbNodes,
+                                                                       Standard_Real& theStep)
+{
+  if (theShape.ShapeType() == TopAbs_FACE)
+  {
+    theShapeType = TopAbs_FACE;
+    TopoDS_Face aF = TopoDS::Face (theShape);
+
+    TopLoc_Location aLocation;
+    Handle(Poly_Triangulation) aTriangulation = BRep_Tool::Triangulation (aF, aLocation);
+
+    if (aTriangulation.IsNull())
+    {
+      return Standard_False;
+    }
+
+    theNbNodes = aTriangulation->NbNodes();
+    Standard_Integer aNbTrg = aTriangulation->NbTriangles();
+    theStep = calcFaceRefinementStep (aF, aNbTrg);
+  }
+  else if (theShape.ShapeType() == TopAbs_EDGE)
+  {
+    theShapeType = TopAbs_EDGE;
+    TopoDS_Edge aE = TopoDS::Edge (theShape);
+
+    TopLoc_Location aLocation;
+    Handle(Poly_Polygon3D) aPolygon = BRep_Tool::Polygon3D (aE, aLocation);
+
+    if (aPolygon.IsNull())
+    {
+      return Standard_False;
+    }
+
+    theNbNodes = aPolygon->NbNodes();
+    theStep = calcEdgeRefinementStep (aE, theNbNodes);
+  }
+  else
+  {
+    return Standard_False;
+  }
+
+  if (theStep < Precision::Confusion())
+  {
+    return Standard_False;
+  }
+
+  return Standard_True;
+}
+
+//=======================================================================
+//function : LoadTriangleSets
+//purpose  : Loads the given list of subshapes into the proximity tool
+//=======================================================================
+void BRepExtrema_ProximityValueTool::LoadShapeLists (const BRepExtrema_ShapeList& theShapeList1,
+                                                     const BRepExtrema_ShapeList& theShapeList2)
+{
+  myShapeList1 = theShapeList1;
+  myShapeList2 = theShapeList2;
+
+  myShape1 = theShapeList1 (0);
+  myIsInitS1 = getInfoForRefinement (myShape1, myShapeType1, myNbNodes1, myStep1);
+
+  myShape2 = theShapeList2 (0);
+  myIsInitS2 = getInfoForRefinement (myShape2, myShapeType2, myNbNodes2, myStep2);
+
+  MarkDirty();
+}
+
+//=======================================================================
+//function : SetNbSamplePoints
+//purpose  : Sets number of sample points used for proximity calculation for each shape
+//=======================================================================
+void BRepExtrema_ProximityValueTool::SetNbSamplePoints(const Standard_Integer theSamples1,
+                                                       const Standard_Integer theSamples2)
+{
+  myNbSamples1 = theSamples1;
+  myNbSamples2 = theSamples2;
+
+  MarkDirty();
+}
+
+//=======================================================================
+//function : computeProximityValue
+//purpose  : Returns the computed proximity value from first BVH to another one
+//=======================================================================
+Standard_Real BRepExtrema_ProximityValueTool::computeProximityDist (const Handle(BRepExtrema_TriangleSet)& theSet1,
+                                                                    const Standard_Integer theNbSamples1,
+                                                                    const BVH_Array3d& theAddVertices1,
+                                                                    const NCollection_Vector<ProxPnt_Status>& theAddStatus1,
+                                                                    const Handle(BRepExtrema_TriangleSet)& theSet2,
+                                                                    const BRepExtrema_ShapeList& theShapeList1,
+                                                                    const BRepExtrema_ShapeList& theShapeList2,
+                                                                    BVH_Vec3d& thePoint1,
+                                                                    BVH_Vec3d& thePoint2,
+                                                                    ProxPnt_Status& thePointStatus1,
+                                                                    ProxPnt_Status& thePointStatus2) const
+{
+  BRepExtrema_ProximityDistTool aProxDistTool (theSet1, theNbSamples1, theAddVertices1, theAddStatus1,
+                                               theSet2, theShapeList1, theShapeList2);
+  aProxDistTool.Perform();
+
+  if (!aProxDistTool.IsDone())
+    return -1.;
+
+  aProxDistTool.ProximityPoints (thePoint1, thePoint2);
+  aProxDistTool.ProximityPointsStatus (thePointStatus1, thePointStatus2);
+
+  return aProxDistTool.ProximityDistance();
+}
+
+//=======================================================================
+//function : getEdgeAdditionalVertices
+//purpose  : Gets additional vertices and their statuses on the edge with the input step
+//=======================================================================
+Standard_Boolean BRepExtrema_ProximityValueTool::getEdgeAdditionalVertices (
+  const TopoDS_Edge& theEdge,
+  const Standard_Real theStep,
+  BVH_Array3d& theAddVertices,
+  NCollection_Vector<ProxPnt_Status>& theAddStatuses)
+{
+  BRepAdaptor_Curve aBAC (theEdge);
+  
+  if (!aBAC.Is3DCurve() || theStep < Precision::Confusion())
+  {
+    return Standard_False;
+  }
+
+  Standard_Real aLen = GCPnts_AbscissaPoint::Length (aBAC);
+  Standard_Integer aNbSamplePoints = (Standard_Integer) (aLen / theStep) + 1;
+
+  GCPnts_QuasiUniformAbscissa aGCPnts (aBAC, Max (3, aNbSamplePoints));
+
+  if (!aGCPnts.IsDone())
+    return Standard_False;
+
+  Standard_Integer aNbNodes = aGCPnts.NbPoints();
+  for (Standard_Integer aVertIdx = 2; aVertIdx < aNbNodes; ++aVertIdx) //don't add extreme points
+  {
+    Standard_Real aPar = aGCPnts.Parameter (aVertIdx);
+    gp_Pnt aP = aBAC.Value (aPar);
+
+    theAddVertices.push_back (BVH_Vec3d (aP.X(), aP.Y(), aP.Z()));
+    theAddStatuses.Append (ProxPnt_Status::ProxPnt_Status_MIDDLE);
+  }
+
+  return Standard_True;
+}
+
+//=======================================================================
+//function : doRecurTrgSplit
+//purpose  : Splits the triangle into two ones recursively, halving the longest side
+//           untill the area of ​​the current triangle > input step
+//! @param theTrg points of the triangle to be splitted
+//! @param theEdgesStatus status of triangle edges - on the border or middle of the face
+//! @param theTol telerance used in search of coincidence points
+//! @param theStep minimum area of ​​the resulting triangle
+//! @param theAddVertices vertices obtained halving sides
+//! @param theAddStatuses status of obtained vertices - on the border or middle of the face,
+//! from triangulation of which the input triangle is
+//=======================================================================
+void BRepExtrema_ProximityValueTool::doRecurTrgSplit (const gp_Pnt (&theTrg)[3],
+                                                      const ProxPnt_Status (&theEdgesStatus)[3],
+                                                      const Standard_Real theTol,
+                                                      const Standard_Real theStep,
+                                                      BVH_Array3d& theAddVertices,
+                                                      NCollection_Vector<ProxPnt_Status>& theAddStatuses)
+{
+  gp_XYZ aTrgSide1 = theTrg[1].Coord() - theTrg[0].Coord();
+  gp_XYZ aTrgSide2 = theTrg[2].Coord() - theTrg[0].Coord();
+  Standard_Real aTrgArea = 0.5 * aTrgSide1.CrossMagnitude (aTrgSide2);
+
+  if (aTrgArea - theStep < Precision::SquareConfusion())
+    return;
+
+  Standard_Real aD[3] { theTrg[0].Distance (theTrg[1]),
+                        theTrg[1].Distance (theTrg[2]),
+                        theTrg[2].Distance (theTrg[0]) };
+  Standard_Integer aBisectedEdgeIdx = aD[0] > aD[1] ? (aD[0] > aD[2] ? 0 : 2) : (aD[1] > aD[2] ? 1 : 2);
+  gp_Pnt aCenterOfMaxSide (theTrg[aBisectedEdgeIdx].Coord());
+  aCenterOfMaxSide.BaryCenter (0.5, theTrg[(aBisectedEdgeIdx + 1) % 3], 0.5);
+
+  Bnd_Box aBox;
+  aBox.Add (aCenterOfMaxSide);
+  aBox.Enlarge (theTol);
+  myInspector.SetCurrent (aCenterOfMaxSide.Coord());
+  myCells.Inspect (aBox.CornerMin().XYZ(), aBox.CornerMax().XYZ(), myInspector);
+  
+  if (myInspector.IsNeedAdd()) //is point aCenterOfMaxSide unique
+  {
+    BVH_Vec3d aBisectingPnt (aCenterOfMaxSide.X(), aCenterOfMaxSide.Y(), aCenterOfMaxSide.Z());
+    theAddVertices.push_back (aBisectingPnt);
+    theAddStatuses.Append (theEdgesStatus[aBisectedEdgeIdx]);
+    myInspector.Add (aCenterOfMaxSide.Coord());
+    myCells.Add (static_cast<BRepExtrema_VertexInspector::Target>(theAddVertices.size()),
+                 aBox.CornerMin().XYZ(), aBox.CornerMax().XYZ());
+  }
+
+  gp_Pnt aTrg1[3] = { theTrg[0], theTrg[1], theTrg[2] };
+  gp_Pnt aTrg2[3] = { theTrg[0], theTrg[1], theTrg[2] };
+  ProxPnt_Status aEdgesStatus1[3] = { theEdgesStatus[0], theEdgesStatus[1], theEdgesStatus[2] };
+  ProxPnt_Status aEdgesStatus2[3] = { theEdgesStatus[0], theEdgesStatus[1], theEdgesStatus[2] };
+  switch (aBisectedEdgeIdx)
+  {
+  case 0:
+    aTrg1[0] = aTrg2[1] = aCenterOfMaxSide;
+    aEdgesStatus1[2] = aEdgesStatus2[1] = ProxPnt_Status::ProxPnt_Status_MIDDLE;
+    break;
+  case 1:
+    aTrg1[1] = aTrg2[2] = aCenterOfMaxSide;
+    aEdgesStatus1[0] = aEdgesStatus2[2] = ProxPnt_Status::ProxPnt_Status_MIDDLE;
+    break;
+  case 2:
+    aTrg1[2] = aTrg2[0] = aCenterOfMaxSide;
+    aEdgesStatus1[1] = aEdgesStatus2[0] = ProxPnt_Status::ProxPnt_Status_MIDDLE;
+    break;
+  }
+
+  doRecurTrgSplit (aTrg1, aEdgesStatus1, theTol, theStep, theAddVertices, theAddStatuses);
+  doRecurTrgSplit (aTrg2, aEdgesStatus2, theTol, theStep, theAddVertices, theAddStatuses);
+}
+
+static Standard_Real getModelRange (const TopLoc_Location& theLocation,
+                                    const Handle(Poly_Triangulation)& theTr)
+{
+  Bnd_Box aBox;
+  theTr->MinMax (aBox, theLocation.Transformation());
+  Standard_Real aXm = 0.0, aYm = 0.0, aZm = 0.0, aXM = 0.0, aYM = 0.0, aZM = 0.0;
+  aBox.Get (aXm, aYm, aZm, aXM, aYM, aZM);
+  Standard_Real aRange = aXM - aXm;
+  aRange = Max (aRange, aYM - aYm);
+  aRange = Max (aRange, aZM - aZm);
+
+  return aRange;
+}
+
+static void getNodesOfTrg (const Standard_Integer theTriIdx,
+                           const TopLoc_Location& theLocation,
+                           const Handle (Poly_Triangulation)& theTr,
+                           gp_Pnt (&theTrg)[3])
+{
+  Standard_Integer aVtxIdx1;
+  Standard_Integer aVtxIdx2;
+  Standard_Integer aVtxIdx3;
+
+  theTr->Triangle (theTriIdx).Get (aVtxIdx1, aVtxIdx2, aVtxIdx3);
+
+  gp_Pnt aVtx1 = theTr->Node (aVtxIdx1);
+  aVtx1.Transform (theLocation);
+  theTrg[0] = aVtx1;
+
+  gp_Pnt aVtx2 = theTr->Node (aVtxIdx2);
+  aVtx2.Transform (theLocation);
+  theTrg[1] = aVtx2;
+
+  gp_Pnt aVtx3 = theTr->Node (aVtxIdx3);
+  aVtx3.Transform (theLocation);
+  theTrg[2] = aVtx3;
+}
+
+// Gets status of triangle edges - on the border or middle of the face
+static void getEdgesStatus(const Standard_Integer theTriIdx,
+                           const Handle(Poly_Triangulation)& theTr,
+                           ProxPnt_Status (&theEdgesStatus1)[3])
+{
+  for (Standard_Integer j = 0; j < 3; j++)
+  {
+    Standard_Integer k = (j + 1) % 3;
+
+    if (BRepExtrema_ProximityDistTool::IsEdgeOnBorder (theTriIdx, j, k, theTr))
+    {
+      theEdgesStatus1[j] = ProxPnt_Status::ProxPnt_Status_BORDER;
+    }
+    else
+    {
+      theEdgesStatus1[j] = ProxPnt_Status::ProxPnt_Status_MIDDLE;
+    }
+  }
+}
+
+//=======================================================================
+//function : getFaceAdditionalVertices
+//purpose  : Gets additional vertices and their statuses on the face with the input step (triangle square)
+//=======================================================================
+Standard_Boolean BRepExtrema_ProximityValueTool::getFaceAdditionalVertices (
+  const TopoDS_Face& theFace,
+  const Standard_Real theStep,
+  BVH_Array3d& theAddVertices,
+  NCollection_Vector<ProxPnt_Status>& theAddStatuses)
+{
+  Standard_Real aTol = Precision::Confusion();
+
+  TopLoc_Location aLocation;
+  Handle(Poly_Triangulation) aTr = BRep_Tool::Triangulation (theFace, aLocation);
+
+  if (aTr.IsNull())
+  {
+    return Standard_False;
+  }
+
+  myCells.Reset (Max (aTol, getModelRange (aLocation, aTr) / IntegerLast()));
+
+  for (Standard_Integer aTriIdx = 1; aTriIdx <= aTr->NbTriangles(); ++aTriIdx)
+  {
+    gp_Pnt aTrg[3];
+    ProxPnt_Status aEdgesStatus[3];
+    getNodesOfTrg (aTriIdx, aLocation, aTr, aTrg);
+    getEdgesStatus (aTriIdx, aTr, aEdgesStatus);
+    doRecurTrgSplit (aTrg, aEdgesStatus, aTol, theStep, theAddVertices, theAddStatuses);
+  }
+
+  return Standard_True;
+}
+
+//=======================================================================
+//function : getShapesVertices
+//purpose  : Gets additional vertices on shapes with refining a coarser one if it's needed
+//=======================================================================
+Standard_Boolean BRepExtrema_ProximityValueTool::getShapesAdditionalVertices()
+{
+  // estimate the density of meshes of shapes to add points to a coarcer one
+  // target steps for refinement
+  Standard_Real aStep1 = myStep1;
+  Standard_Real aStep2 = myStep2;
+
+  if ((myShapeType1 == TopAbs_EDGE) && (myShapeType2 == TopAbs_EDGE))
+  {
+    if (myNbSamples1 > myNbNodes1) // 1st edge needs refinement
+    {
+      aStep1 = calcEdgeRefinementStep (TopoDS::Edge (myShape1), myNbSamples1);
+      myIsRefinementRequired1 = Standard_True;
+    }
+
+    if (myNbSamples2 > myNbNodes2) // 2nd edge needs refinement
+    {
+      aStep2 = calcEdgeRefinementStep (TopoDS::Edge (myShape2), myNbSamples2);
+      myIsRefinementRequired2 = Standard_True;
+    }
+
+    if (aStep1 / aStep2 > 2.) // 1st edge needs refinement
+    {
+      myIsRefinementRequired1 = Standard_True;
+      aStep1 = aStep2;
+    }
+    else if (aStep2 / aStep1 > 2.) // 2nd edge needs refinement
+    {
+      myIsRefinementRequired2 = Standard_True;
+      aStep2 = aStep1;
+    }
+
+    if (myIsRefinementRequired1)
+    {
+      if (!getEdgeAdditionalVertices (TopoDS::Edge (myShape1), aStep1, myAddVertices1, myAddStatus1))
+      {
+        return Standard_False;
+      }
+    }
+
+    if (myIsRefinementRequired2)
+    {
+      if (!getEdgeAdditionalVertices (TopoDS::Edge (myShape2), aStep2, myAddVertices2, myAddStatus2))
+      {
+        return Standard_False;
+      }
+    }
+  }
+  else if ((myShapeType1 == TopAbs_FACE) && (myShapeType2 == TopAbs_FACE))
+  {
+    if (aStep1 / aStep2 > 2) // 1st face needs refinement
+    {
+      myIsRefinementRequired1 = Standard_True;
+      aStep1 = myStep2;
+    }
+    else if (aStep2 / aStep1 > 2.) // 2nd face needs refinement
+    {
+      myIsRefinementRequired2 = Standard_True;
+      aStep2 = myStep1;
+    }
+
+    if (myIsRefinementRequired1)
+    {
+      return getFaceAdditionalVertices (TopoDS::Face (myShape1), aStep1, myAddVertices1, myAddStatus1);
+    }
+
+    if (myIsRefinementRequired2)
+    {
+      return getFaceAdditionalVertices (TopoDS::Face (myShape2), aStep2, myAddVertices2, myAddStatus2);
+    }
+  }
+
+  return Standard_True;
+}
+
+//=======================================================================
+//function : Perform
+//purpose  : Performs the computation of the proximity value
+//=======================================================================
+void BRepExtrema_ProximityValueTool::Perform (Standard_Real& theTolerance)
+{
+  if (!myIsInitS1 || !myIsInitS2 || (myShapeType1 != myShapeType2))
+    return;
+
+  //get vertices on shapes with refining a coarser mesh if it's needed
+  if (!getShapesAdditionalVertices())
+    return;
+
+  // max(min) dist from the 1st shape to the 2nd one
+  BVH_Vec3d aP1_1, aP1_2;
+  ProxPnt_Status aPointStatus1_1 = ProxPnt_Status::ProxPnt_Status_UNKNOWN;
+  ProxPnt_Status aPointStatus1_2 = ProxPnt_Status::ProxPnt_Status_UNKNOWN;
+
+  Standard_Real aProximityDist1 = computeProximityDist (mySet1, myNbSamples1, myAddVertices1, myAddStatus1,
+                                                        mySet2,
+                                                        myShapeList1, myShapeList2,
+                                                        aP1_1, aP1_2,
+                                                        aPointStatus1_1, aPointStatus1_2);
+
+  if (aProximityDist1 < 0.)
+    return;
+
+  // max(min) dist from the 2nd shape to t he 1st one
+  BVH_Vec3d aP2_1, aP2_2;
+  ProxPnt_Status aPointStatus2_1 = ProxPnt_Status::ProxPnt_Status_UNKNOWN;
+  ProxPnt_Status aPointStatus2_2 = ProxPnt_Status::ProxPnt_Status_UNKNOWN;
+
+  Standard_Real aProximityDist2 = computeProximityDist (mySet2, myNbSamples2, myAddVertices2, myAddStatus2,
+                                                        mySet1,
+                                                        myShapeList2, myShapeList1,
+                                                        aP2_2, aP2_1,
+                                                        aPointStatus2_2, aPointStatus2_1);
+
+  if (aProximityDist2 < 0.)
+    return;
+
+  // min dist of the two max(min) dists
+  if (aProximityDist1 < aProximityDist2)
+  {
+    myDistance = aProximityDist1;
+    myPnt1.SetCoord(aP1_1.x(), aP1_1.y(), aP1_1.z());
+    myPnt2.SetCoord(aP1_2.x(), aP1_2.y(), aP1_2.z());
+    myPntStatus1 = aPointStatus1_1;
+    myPntStatus2 = aPointStatus1_2;
+  }
+  else
+  {
+    myDistance = aProximityDist2;
+    myPnt1.SetCoord(aP2_1.x(), aP2_1.y(), aP2_1.z());
+    myPnt2.SetCoord(aP2_2.x(), aP2_2.y(), aP2_2.z());
+    myPntStatus1 = aPointStatus2_1;
+    myPntStatus2 = aPointStatus2_2;
+  }
+
+  myIsDone = Standard_True;
+  theTolerance = myDistance;
+}
+
+//=======================================================================
+//function : Inspect
+//purpose  : Used for selection and storage of coinciding nodes
+//=======================================================================
+NCollection_CellFilter_Action BRepExtrema_VertexInspector::Inspect (const Standard_Integer theTarget)
+{
+  myIsNeedAdd = Standard_True;
+
+  const gp_XYZ& aPnt = myPoints.Value (theTarget - 1);
+  Standard_Real aDx, aDy, aDz;
+  aDx = myCurrent.X() - aPnt.X();
+  aDy = myCurrent.Y() - aPnt.Y();
+  aDz = myCurrent.Z() - aPnt.Z();
+
+  if ((aDx * aDx <= myTol) && (aDy * aDy <= myTol) && (aDz * aDz <= myTol))
+    myIsNeedAdd = Standard_False;
+
+  return CellFilter_Keep;
+}

src/BRepExtrema/BRepExtrema_ProximityValueTool.hxx

@@ -0,0 +1,242 @@
+// Created on: 2022-08-08
+// Created by: Kseniya NOSULKO
+// Copyright (c) 2022 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#ifndef _BRepExtrema_ProximityValueTool_HeaderFile
+#define _BRepExtrema_ProximityValueTool_HeaderFile
+
+#include <BRepExtrema_ProximityDistTool.hxx>
+#include <BRepExtrema_TriangleSet.hxx>
+#include <NCollection_CellFilter.hxx>
+#include <Precision.hxx>
+
+typedef NCollection_Vector<gp_XYZ> VectorOfPoint;
+
+//! Class BRepExtrema_VertexInspector
+//!   derived from NCollection_CellFilter_InspectorXYZ
+//!   This class define the Inspector interface for CellFilter algorithm,
+//!   working with gp_XYZ points in 3d space.
+//!   Used in search of coincidence points with a certain tolerance.
+class BRepExtrema_VertexInspector : public NCollection_CellFilter_InspectorXYZ
+{
+public:
+  typedef Standard_Integer Target;
+
+  //! Constructor; remembers the tolerance
+  BRepExtrema_VertexInspector()
+  : myTol (Precision::SquareConfusion()),
+    myIsNeedAdd (Standard_True)
+  {}
+
+  //! Keep the points used for comparison
+  void Add (const gp_XYZ& thePnt)
+  {
+    myPoints.Append (thePnt);
+  }
+
+  //! Set tolerance for comparison of point coordinates
+  void SetTol (const Standard_Real theTol)
+  {
+    myTol = theTol;
+  }
+
+  //! Set current point to search for coincidence
+  void SetCurrent (const gp_XYZ& theCurPnt)
+  {
+    myCurrent = theCurPnt;
+    myIsNeedAdd = Standard_True;
+  }
+
+  Standard_Boolean IsNeedAdd()
+  {
+    return myIsNeedAdd;
+  }
+
+  //! Implementation of inspection method
+  Standard_EXPORT NCollection_CellFilter_Action Inspect (const Standard_Integer theTarget);
+
+private:
+  Standard_Real myTol;
+  Standard_Boolean myIsNeedAdd;
+  VectorOfPoint myPoints;
+  gp_XYZ myCurrent;
+};
+
+typedef NCollection_CellFilter<BRepExtrema_VertexInspector> BRepExtrema_CellFilter;
+typedef typename BRepExtrema_ProximityDistTool::ProxPnt_Status ProxPnt_Status;
+
+//! Tool class for computation of the proximity value from one BVH
+//! primitive set to another, solving max(min) problem.
+//! Handles only edge/edge or face/face cases.
+//! This tool is not intended to be used independently, and is integrated
+//! in other classes, implementing algorithms based on shape tessellation
+//! (BRepExtrema_ShapeProximity and BRepExtrema_SelfIntersection).
+//! 
+//! Please note that algorithm results are approximate and depend greatly
+//! on the quality of input tessellation(s).
+class BRepExtrema_ProximityValueTool
+{
+
+public:
+
+  //! Creates new unitialized proximity tool.
+  Standard_EXPORT BRepExtrema_ProximityValueTool();
+
+  //! Creates new proximity tool for the given element sets.
+  Standard_EXPORT BRepExtrema_ProximityValueTool (const Handle(BRepExtrema_TriangleSet)& theSet1,
+                                                  const Handle(BRepExtrema_TriangleSet)& theSet2,
+                                                  const BRepExtrema_ShapeList& theShapeList1,
+                                                  const BRepExtrema_ShapeList& theShapeList2);
+
+public:
+
+  //! Loads the given element sets into the proximity tool.
+  Standard_EXPORT void LoadTriangleSets (const Handle (BRepExtrema_TriangleSet)& theSet1,
+                                         const Handle (BRepExtrema_TriangleSet)& theSet2);
+
+  //! Loads the given list of subshapes into the proximity tool.
+  Standard_EXPORT void LoadShapeLists (const BRepExtrema_ShapeList& theShapeList1,
+                                       const BRepExtrema_ShapeList& theShapeList2);
+
+  //! Sets number of sample points used for proximity calculation for each shape.
+  //! If number is less or equal zero, all triangulation nodes are used.
+  Standard_EXPORT void SetNbSamplePoints (const Standard_Integer theSamples1 = 0,
+                                          const Standard_Integer theSamples2 = 0);
+
+  //! Performs the computation of the proximity value.
+  Standard_EXPORT void Perform (Standard_Real& theTolerance);
+
+  //! Is proximity test completed?
+  Standard_Boolean IsDone() const { return myIsDone; }
+
+  //! Marks test results as outdated.
+  void MarkDirty() { myIsDone = Standard_False; }
+
+  //! Returns the computed distance.
+  Standard_Real Distance() const { return myDistance; }
+
+  //! Returns points on triangles sets, which provide the proximity distance.
+  void ProximityPoints(gp_Pnt& thePoint1, gp_Pnt& thePoint2) const
+  {
+    thePoint1 = myPnt1;
+    thePoint2 = myPnt2;
+  }
+
+  //! Returns status of points on triangles sets, which provide the proximity distance.
+  void ProximityPointsStatus (ProxPnt_Status& thePointStatus1, ProxPnt_Status& thePointStatus2) const
+  {
+    thePointStatus1 = myPntStatus1;
+    thePointStatus2 = myPntStatus2;
+  }
+
+private:
+
+  //! Gets shape data for further refinement.
+  Standard_Boolean getInfoForRefinement (const TopoDS_Shape& theShapes,
+                                         TopAbs_ShapeEnum& theShapeType,
+                                         Standard_Integer& theNbNodes,
+                                         Standard_Real& theStep);
+
+  //! Returns the computed proximity value from first BVH to another one.
+  Standard_Real computeProximityDist (const Handle(BRepExtrema_TriangleSet)& theSet1,
+                                      const Standard_Integer theNbSamples1,
+                                      const BVH_Array3d& theAddVertices1,
+                                      const NCollection_Vector<ProxPnt_Status>& theAddStatus1,
+                                      const Handle(BRepExtrema_TriangleSet)& theSet2,
+                                      const BRepExtrema_ShapeList& theShapeList1,
+                                      const BRepExtrema_ShapeList& theShapeList2,
+                                      BVH_Vec3d& thePoint1,
+                                      BVH_Vec3d& thePoint2,
+                                      ProxPnt_Status& thePointStatus1,
+                                      ProxPnt_Status& thePointStatus2) const;
+
+  //! Gets additional vertices on shapes with refining a coarser one if it's needed.
+  Standard_Boolean getShapesAdditionalVertices();
+
+  //! Gets additional vertices and their statuses on the edge with the input step.
+  Standard_Boolean getEdgeAdditionalVertices (const TopoDS_Edge& theEdge,
+                                              const Standard_Real theStep,
+                                              BVH_Array3d& theAddVertices,
+                                              NCollection_Vector<ProxPnt_Status>& theAddStatuses);
+
+  //! Gets additional vertices and their statuses on the face with the input step (triangle square).
+  Standard_Boolean getFaceAdditionalVertices (const TopoDS_Face& theFace,
+                                              const Standard_Real theStep,
+                                              BVH_Array3d& theAddVertices,
+                                              NCollection_Vector<ProxPnt_Status>& theAddStatuses);
+
+  //! Splits the triangle recursively, halving the longest side
+  //! to the area of ​​the current triangle > input step
+  void doRecurTrgSplit (const gp_Pnt (&theTrg)[3],
+                        const ProxPnt_Status (&theEdgesStatus)[3],
+                        const Standard_Real theTol,
+                        const Standard_Real theStep,
+                        BVH_Array3d& theAddVertices,
+                        NCollection_Vector<ProxPnt_Status>& theAddStatuses);
+private:
+
+  //! Set of all mesh primitives of the 1st shape.
+  Handle(BRepExtrema_TriangleSet) mySet1;
+  //! Set of all mesh primitives of the 2nd shape.
+  Handle(BRepExtrema_TriangleSet) mySet2;
+
+  //! List of subshapes of the 1st shape.
+  BRepExtrema_ShapeList myShapeList1;
+  //! List of subshapes of the 2nd shape.
+  BRepExtrema_ShapeList myShapeList2;
+
+  //! The 1st shape.
+  TopoDS_Shape myShape1;
+  //! The 2nd shape.
+  TopoDS_Shape myShape2;
+
+  BVH_Array3d myAddVertices1; //!< Additional vertices on the 1st shape if its mesh is coarser.
+  BVH_Array3d myAddVertices2; //!< Additional vertices on the 2nd shape if its mesh is coarser.
+
+  NCollection_Vector<ProxPnt_Status> myAddStatus1; //!< Status of additional vertices on the 1st shape.
+  NCollection_Vector<ProxPnt_Status> myAddStatus2; //!< Status of additional vertices on the 2nd shape.
+
+  Standard_Boolean myIsInitS1; //!< Is the 1st shape initialized?
+  Standard_Boolean myIsInitS2; //!< Is the 2nd shape initialized?
+
+  Standard_Boolean myIsRefinementRequired1; //!< Flag about the need to refine the 1st shape.
+  Standard_Boolean myIsRefinementRequired2; //!< Flag about the need to refine the 2nd shape.
+
+  Standard_Integer myNbNodes1; //!< Number of nodes in triangulation of the 1st shape.
+  Standard_Integer myNbNodes2; //!< Number of nodes in triangulation of the 2nd shape.
+
+  Standard_Real myStep1; //!< Step for getting vertices on the 1st shape.
+  Standard_Real myStep2; //!< Step for getting vertices on the 2nd shape.
+
+  BRepExtrema_CellFilter myCells;
+  BRepExtrema_VertexInspector myInspector;
+
+  TopAbs_ShapeEnum myShapeType1; //!< 1st shape type.
+  TopAbs_ShapeEnum myShapeType2; //!< 2nd shape type.
+
+  Standard_Real myDistance;  //!< Distance
+  Standard_Boolean myIsDone; //!< State of the algorithm
+
+  Standard_Integer myNbSamples1; //!< Number of samples points on the first shape
+  Standard_Integer myNbSamples2; //!< Number of samples points on the second shape
+
+  //! Proximity points
+  gp_Pnt myPnt1, myPnt2;
+
+  //! Proximity points' status
+  ProxPnt_Status myPntStatus1, myPntStatus2;
+
+};
+
+#endif // _BRepExtrema_ProximityValueTool_HeaderFile

src/BRepExtrema/BRepExtrema_SelfIntersection.hxx

@@ -18,6 +18,8 @@
 
 #include <BRepExtrema_OverlapTool.hxx>
 
+#include <TopoDS.hxx>
+
 //! Tool class for detection of self-sections in the given shape.
 //! This class is based on BRepExtrema_OverlapTool and thus uses
 //! shape tessellation to detect incorrect mesh fragments (pairs
@@ -76,7 +78,7 @@ public:
   //! Returns sub-shape from the shape for the given index (started from 0).
   const TopoDS_Face& GetSubShape (const Standard_Integer theID) const
   {
-    return myFaceList.Value (theID);
+    return TopoDS::Face(myFaceList.Value(theID));
   }
 
   //! Returns set of all the face triangles of the shape.

src/BRepExtrema/BRepExtrema_ShapeProximity.cxx

@@ -18,6 +18,28 @@
 #include <Precision.hxx>
 #include <TopExp_Explorer.hxx>
 
+// Assign a map of sub-shapes (edges/faces) of a given shape
+static Standard_Boolean initSubShapes(const TopoDS_Shape&              theShape,
+                                      BRepExtrema_ShapeList&           theSubshapesList,
+                                      Handle(BRepExtrema_TriangleSet)& theTriangleSet)
+{
+  theSubshapesList.Clear();
+
+  for (TopExp_Explorer anIter(theShape, TopAbs_FACE); anIter.More(); anIter.Next())
+  {
+    theSubshapesList.Append(anIter.Current());
+  }
+
+  for (TopExp_Explorer anIter(theShape, TopAbs_EDGE); anIter.More(); anIter.Next())
+  {
+    theSubshapesList.Append(anIter.Current());
+  }
+
+  if (theTriangleSet.IsNull())
+    theTriangleSet = new BRepExtrema_TriangleSet;
+  return theTriangleSet->Init(theSubshapesList);
+}
+
 //=======================================================================
 //function : BRepExtrema_ShapeProximity
 //purpose  : Creates uninitialized proximity tool
@@ -25,7 +47,9 @@
 BRepExtrema_ShapeProximity::BRepExtrema_ShapeProximity (const Standard_Real theTolerance)
 : myTolerance   (theTolerance),
   myElementSet1 (new BRepExtrema_TriangleSet),
-  myElementSet2 (new BRepExtrema_TriangleSet)
+  myElementSet2 (new BRepExtrema_TriangleSet),
+  myNbSamples1  (0),
+  myNbSamples2  (0)
 {
   // Should be initialized later
   myIsInitS1 = myIsInitS2 = Standard_False;
@@ -40,7 +64,9 @@ BRepExtrema_ShapeProximity::BRepExtrema_ShapeProximity (const TopoDS_Shape& theS
                                                         const Standard_Real theTolerance)
 : myTolerance   (theTolerance),
   myElementSet1 (new BRepExtrema_TriangleSet),
-  myElementSet2 (new BRepExtrema_TriangleSet)
+  myElementSet2 (new BRepExtrema_TriangleSet),
+  myNbSamples1  (0),
+  myNbSamples2  (0)
 {
   LoadShape1 (theShape1);
   LoadShape2 (theShape2);
@@ -52,16 +78,18 @@ BRepExtrema_ShapeProximity::BRepExtrema_ShapeProximity (const TopoDS_Shape& theS
 //=======================================================================
 Standard_Boolean BRepExtrema_ShapeProximity::LoadShape1 (const TopoDS_Shape& theShape1)
 {
-  myFaceList1.Clear();
+  myIsInitS1 = initSubShapes(theShape1, myShapeList1, myElementSet1);
 
-  for (TopExp_Explorer anIter (theShape1, TopAbs_FACE); anIter.More(); anIter.Next())
+  if (myTolerance == Precision::Infinite())
   {
-    myFaceList1.Append (static_cast<const TopoDS_Face&> (anIter.Current()));
+    myProxValTool.MarkDirty();
+  }
+  else
+  {
+    myOverlapTool.MarkDirty();
   }
 
-  myOverlapTool.MarkDirty();
-
-  return myIsInitS1 = myElementSet1->Init (myFaceList1);
+  return myIsInitS1;
 }
 
 //=======================================================================
@@ -70,16 +98,18 @@ Standard_Boolean BRepExtrema_ShapeProximity::LoadShape1 (const TopoDS_Shape& the
 //=======================================================================
 Standard_Boolean BRepExtrema_ShapeProximity::LoadShape2 (const TopoDS_Shape& theShape2)
 {
-  myFaceList2.Clear();
+  myIsInitS2 = initSubShapes(theShape2, myShapeList2, myElementSet2);
 
-  for (TopExp_Explorer anIter (theShape2, TopAbs_FACE); anIter.More(); anIter.Next())
+  if (myTolerance == Precision::Infinite())
   {
-    myFaceList2.Append (static_cast<const TopoDS_Face&> (anIter.Current()));
+    myProxValTool.MarkDirty();
+  }
+  else
+  {
+    myOverlapTool.MarkDirty();
   }
 
-  myOverlapTool.MarkDirty();
-
-  return myIsInitS2 = myElementSet2->Init (myFaceList2);
+  return myIsInitS2;
 }
 
 //=======================================================================
@@ -88,13 +118,33 @@ Standard_Boolean BRepExtrema_ShapeProximity::LoadShape2 (const TopoDS_Shape& the
 //=======================================================================
 void BRepExtrema_ShapeProximity::Perform()
 {
-  if (!myIsInitS1 || !myIsInitS2 || myOverlapTool.IsDone())
+  if (myTolerance == Precision::Infinite())
   {
-    return;
+    if (!myIsInitS1 || !myIsInitS2 || myProxValTool.IsDone())
+    {
+      return;
+    }
+
+    myProxValTool.LoadTriangleSets (myElementSet1,
+                                    myElementSet2);
+    myProxValTool.LoadShapeLists (myShapeList1,
+                                  myShapeList2);
+    myProxValTool.SetNbSamplePoints (myNbSamples1, myNbSamples2);
+
+    myProxValTool.Perform (myTolerance);
+    myProxValTool.ProximityPoints(myProxPoint1, myProxPoint2);
+    myProxValTool.ProximityPointsStatus (myProxPntStatus1, myProxPntStatus2);
   }
+  else
+  {
+    if (!myIsInitS1 || !myIsInitS2 || myOverlapTool.IsDone())
+    {
+      return;
+    }
 
-  myOverlapTool.LoadTriangleSets (myElementSet1,
-                                  myElementSet2);
+    myOverlapTool.LoadTriangleSets (myElementSet1,
+                                    myElementSet2);
 
-  myOverlapTool.Perform (myTolerance);
+    myOverlapTool.Perform (myTolerance);
+  }
 }

src/BRepExtrema/BRepExtrema_ShapeProximity.hxx

@@ -16,31 +16,47 @@
 #ifndef _BRepExtrema_ShapeProximity_HeaderFile
 #define _BRepExtrema_ShapeProximity_HeaderFile
 
+#include <NCollection_DataMap.hxx>
+#include <Precision.hxx>
+#include <TColStd_PackedMapOfInteger.hxx>
+
+#include <BRepExtrema_ProximityValueTool.hxx>
+#include <BRepExtrema_TriangleSet.hxx>
 #include <BRepExtrema_OverlapTool.hxx>
 
-//! Tool class for shape proximity detection.
+//! @brief Tool class for shape proximity detection.
+//!
+//! First approach:
 //! For two given shapes and given tolerance (offset from the mesh) the algorithm allows
 //! to determine whether or not they are overlapped. The algorithm input consists of any
 //! shapes which can be decomposed into individual faces (used as basic shape elements).
-//! High performance is achieved through the use of existing triangulation of faces. So
-//! poly triangulation (with the desired deflection) should already be built. Note that
-//! solution is approximate (and corresponds to the deflection used for triangulation).
 //!
 //! The algorithm can be run in two modes. If tolerance is set to zero, the algorithm
 //! will detect only intersecting faces (containing triangles with common points). If
 //! tolerance is set to positive value, the algorithm will also detect faces located
 //! on distance less than the given tolerance from each other.
+//!
+//! Second approach:
+//! Compute the proximity value between two shapes (handles only edge/edge or face/face cases)
+//! if the tolerance is not defined (Precision::Infinite()).
+//! In this case the proximity value is a minimal thickness of a layer containing both shapes.
+//!
+//! For the both approaches the high performance is achieved through the use of existing
+//! triangulation of faces. So, poly triangulation (with the desired deflection) should already
+//! be built. Note that solution is approximate (and corresponds to the deflection used for
+//! triangulation).
 class BRepExtrema_ShapeProximity
 {
+
 public:
 
   //! Creates empty proximity tool.
-  Standard_EXPORT BRepExtrema_ShapeProximity (const Standard_Real theTolerance = 0.0);
+  Standard_EXPORT BRepExtrema_ShapeProximity (const Standard_Real theTolerance = Precision::Infinite());
 
   //! Creates proximity tool for the given two shapes.
   Standard_EXPORT BRepExtrema_ShapeProximity (const TopoDS_Shape& theShape1,
                                               const TopoDS_Shape& theShape2,
-                                              const Standard_Real theTolerance = 0.0);
+                                              const Standard_Real theTolerance = Precision::Infinite());
 
 public:
 
@@ -56,19 +72,33 @@ public:
     myTolerance = theTolerance;
   }
 
+  //! Returns proximity value calculated for the whole input shapes.
+  Standard_Real Proximity() const
+  {
+    return Tolerance();
+  }
+
   //! Loads 1st shape into proximity tool.
   Standard_EXPORT Standard_Boolean LoadShape1 (const TopoDS_Shape& theShape1);
 
   //! Loads 2nd shape into proximity tool.
   Standard_EXPORT Standard_Boolean LoadShape2 (const TopoDS_Shape& theShape2);
 
+  //! Set number of sample points on the 1st shape used to compute the proximity value.
+  //! In case of 0, all triangulation nodes will be used.
+  void SetNbSamples1(const Standard_Integer theNbSamples) { myNbSamples1 = theNbSamples; }
+
+  //! Set number of sample points on the 2nd shape used to compute the proximity value.
+  //! In case of 0, all triangulation nodes will be used.
+  void SetNbSamples2(const Standard_Integer theNbSamples) { myNbSamples2 = theNbSamples; }
+
   //! Performs search of overlapped faces.
   Standard_EXPORT void Perform();
 
   //! True if the search is completed.
   Standard_Boolean IsDone() const
   { 
-    return myOverlapTool.IsDone();
+    return myOverlapTool.IsDone() || myProxValTool.IsDone();
   }
 
   //! Returns set of IDs of overlapped faces of 1st shape (started from 0).
@@ -84,15 +114,15 @@ public:
   }
 
   //! Returns sub-shape from 1st shape with the given index (started from 0).
-  const TopoDS_Face& GetSubShape1 (const Standard_Integer theID) const
+  const TopoDS_Shape& GetSubShape1 (const Standard_Integer theID) const
   {
-    return myFaceList1.Value (theID);
+    return myShapeList1.Value (theID);
   }
 
   //! Returns sub-shape from 1st shape with the given index (started from 0).
-  const TopoDS_Face& GetSubShape2 (const Standard_Integer theID) const
+  const TopoDS_Shape& GetSubShape2 (const Standard_Integer theID) const
   {
-    return myFaceList2.Value (theID);
+    return myShapeList2.Value (theID);
   }
 
   //! Returns set of all the face triangles of the 1st shape.
@@ -107,6 +137,34 @@ public:
     return myElementSet2;
   }
 
+  //! Returns the point on the 1st shape, which could be used as a reference point
+  //! for the value of the proximity.
+  const gp_Pnt& ProximityPoint1() const
+  {
+    return myProxPoint1;
+  }
+
+  //! Returns the point on the 2nd shape, which could be used as a reference point
+  //! for the value of the proximity.
+  const gp_Pnt& ProximityPoint2() const
+  {
+    return myProxPoint2;
+  }
+
+  //! Returns the status of point on the 1st shape, which could be used as a reference point
+  //! for the value of the proximity.
+  const ProxPnt_Status& ProxPntStatus1() const
+  {
+    return myProxPntStatus1;
+  }
+
+  //! Returns the status of point on the 2nd shape, which could be used as a reference point
+  //! for the value of the proximity.
+  const ProxPnt_Status& ProxPntStatus2() const
+  {
+    return myProxPntStatus2;
+  }
+
 private:
 
   //! Maximum overlapping distance.
@@ -117,19 +175,39 @@ private:
   //! Is the 2nd shape initialized?
   Standard_Boolean myIsInitS2;
 
-  //! List of faces of the 1st shape.
-  BRepExtrema_ShapeList myFaceList1;
-  //! List of faces of the 2nd shape.
-  BRepExtrema_ShapeList myFaceList2;
+  //! List of subshapes of the 1st shape.
+  BRepExtrema_ShapeList myShapeList1;
+  //! List of subshapes of the 2nd shape.
+  BRepExtrema_ShapeList myShapeList2;
 
   //! Set of all the face triangles of the 1st shape.
   Handle(BRepExtrema_TriangleSet) myElementSet1;
   //! Set of all the face triangles of the 2nd shape.
   Handle(BRepExtrema_TriangleSet) myElementSet2;
 
+  //! Number of sample points on the 1st shape used to compute the proximity value
+  //! (if zero (default), all triangulation nodes will be used).
+  Standard_Integer myNbSamples1;
+  //! Number of sample points on the 2nd shape used to compute the proximity value
+  //! (if zero (default), all triangulation nodes will be used).
+  Standard_Integer myNbSamples2;
+
+  //! Reference point of the proximity value on the 1st shape.
+  gp_Pnt myProxPoint1;
+  //! Reference point of the proximity value on the 2st shape.
+  gp_Pnt myProxPoint2;
+
+  //! Status of reference points of the proximity value.
+  ProxPnt_Status myProxPntStatus1, myProxPntStatus2;
+
   //! Overlap tool used for intersection/overlap test.
   BRepExtrema_OverlapTool myOverlapTool;
 
+  //! Shape-shape proximity tool used for computation of
+  //! the minimal diameter of a tube containing both edges or
+  //! the minimal thickness of a shell containing both faces.
+  BRepExtrema_ProximityValueTool myProxValTool;
+
 };
 
 #endif // _BRepExtrema_ShapeProximity_HeaderFile

src/BRepExtrema/BRepExtrema_TriangleSet.cxx

@@ -18,6 +18,7 @@
 #include <BRep_Tool.hxx>
 #include <BVH_LinearBuilder.hxx>
 #include <Poly_Triangulation.hxx>
+#include <TopoDS.hxx>
 
 IMPLEMENT_STANDARD_RTTIEXT(BRepExtrema_TriangleSet, BVH_PrimitiveSet3d)
 
@@ -114,17 +115,65 @@ void BRepExtrema_TriangleSet::Swap (const Standard_Integer theIndex1, const Stan
 {
   std::swap (myTriangles[theIndex1],
              myTriangles[theIndex2]);
+
+  std::swap (myTrgIdxMap (theIndex1),
+             myTrgIdxMap (theIndex2));
 }
 
 //=======================================================================
 //function : GetFaceID
-//purpose  : Returns face ID of the given triangle
+//purpose  : Returns face ID of the given vertex
 //=======================================================================
 Standard_Integer BRepExtrema_TriangleSet::GetFaceID (const Standard_Integer theIndex) const
 {
   return myTriangles[theIndex].w();
 }
 
+//=======================================================================
+//function : GetShapeIDOfVtx
+//purpose  : Returns shape ID of the given vertex index
+//=======================================================================
+Standard_Integer BRepExtrema_TriangleSet::GetShapeIDOfVtx (const Standard_Integer theIndex) const
+{
+  return myShapeIdxOfVtxVec.Value (theIndex);
+}
+
+//=======================================================================
+//function : GetVtxIdxInShape
+//purpose  : Returns vertex index in tringulation of the shape, which vertex belongs,
+//           with the given vtx ID in whole set
+//=======================================================================
+Standard_Integer BRepExtrema_TriangleSet::GetVtxIdxInShape (const Standard_Integer theIndex) const
+{
+  Standard_Integer aShID = myShapeIdxOfVtxVec.Value (theIndex);
+  Standard_Integer aNumVertices = 0;
+
+  for (Standard_Integer aSIdx = 0; aSIdx < aShID; aSIdx++)
+  {
+    aNumVertices += myNumVtxInShapeVec.Value (aSIdx);
+  }
+
+  return theIndex - aNumVertices;
+}
+
+//=======================================================================
+//function : GetTrgIdxInShape
+//purpose  :  Returns triangle index (before swapping) in tringulation of the shape, which triangle belongs,
+//            with the given trg ID in whole set (after swapping)
+//=======================================================================
+Standard_Integer BRepExtrema_TriangleSet::GetTrgIdxInShape (const Standard_Integer theIndex) const
+{
+  Standard_Integer aShID = GetFaceID (theIndex);
+  Standard_Integer aNumTriangles = 0;
+
+  for (Standard_Integer aSIdx = 0; aSIdx < aShID; aSIdx++)
+  {
+    aNumTriangles += myNumTrgInShapeVec.Value (aSIdx);
+  }
+
+  return myTrgIdxMap (theIndex) - aNumTriangles;
+}
+
 //=======================================================================
 //function : GetVertices
 //purpose  : Returns vertices of the given triangle
@@ -141,6 +190,21 @@ void BRepExtrema_TriangleSet::GetVertices (const Standard_Integer theIndex,
   theVertex3 = myVertexArray[aTriangle.z()];
 }
 
+//=======================================================================
+//function : GetVertices
+//purpose  : Returns vertices of the given triangle
+//=======================================================================
+void BRepExtrema_TriangleSet::GetVtxIndices (const Standard_Integer theIndex,
+                                             NCollection_Array1<Standard_Integer>& theVtxIndices) const
+{
+  BVH_Vec4i aTriangle = myTriangles[theIndex];
+
+  theVtxIndices = NCollection_Array1<Standard_Integer> (0, 2);
+  theVtxIndices.SetValue (0, aTriangle.x());
+  theVtxIndices.SetValue (1, aTriangle.y());
+  theVtxIndices.SetValue (2, aTriangle.z());
+}
+
 //=======================================================================
 //function : Clear
 //purpose  : Clears triangle set data
@@ -158,41 +222,26 @@ void BRepExtrema_TriangleSet::Clear()
 //function : Init
 //purpose  : Initializes triangle set
 //=======================================================================
-Standard_Boolean BRepExtrema_TriangleSet::Init (const BRepExtrema_ShapeList& theFaces)
+Standard_Boolean BRepExtrema_TriangleSet::Init (const BRepExtrema_ShapeList& theShapes)
 {
   Clear();
 
-  for (Standard_Integer aFaceIdx = 0; aFaceIdx < theFaces.Size(); ++aFaceIdx)
+  Standard_Boolean isOK = Standard_True;
+  for (Standard_Integer aShapeIdx = 0; aShapeIdx < theShapes.Size() && isOK; ++aShapeIdx)
   {
-    TopLoc_Location aLocation;
+    if (theShapes (aShapeIdx).ShapeType() == TopAbs_FACE)
+      isOK = initFace (TopoDS::Face (theShapes(aShapeIdx)), aShapeIdx);
+    else if (theShapes (aShapeIdx).ShapeType() == TopAbs_EDGE)
+      isOK = initEdge (TopoDS::Edge (theShapes(aShapeIdx)), aShapeIdx);
+  }
 
-    Handle(Poly_Triangulation) aTriangulation =
-      BRep_Tool::Triangulation (theFaces (aFaceIdx), aLocation);
+  Standard_Integer aNumTrg = static_cast<Standard_Integer> (myTriangles.size());
+  myTrgIdxMap.Clear();
+  myTrgIdxMap.ReSize (aNumTrg);
 
-    if (aTriangulation.IsNull())
-    {
-      return Standard_False;
-    }
-
-    const Standard_Integer aVertOffset =
-      static_cast<Standard_Integer> (myVertexArray.size()) - 1;
-
-    for (Standard_Integer aVertIdx = 1; aVertIdx <= aTriangulation->NbNodes(); ++aVertIdx)
-    {
-      gp_Pnt aVertex = aTriangulation->Node (aVertIdx);
-      aVertex.Transform (aLocation.Transformation());
-      myVertexArray.push_back (BVH_Vec3d (aVertex.X(), aVertex.Y(), aVertex.Z()));
-    }
-
-    for (Standard_Integer aTriIdx = 1; aTriIdx <= aTriangulation->NbTriangles(); ++aTriIdx)
-    {
-      Standard_Integer aVertex1, aVertex2, aVertex3;
-      aTriangulation->Triangle (aTriIdx).Get (aVertex1, aVertex2, aVertex3);
-      myTriangles.push_back (BVH_Vec4i (aVertex1 + aVertOffset,
-                                        aVertex2 + aVertOffset,
-                                        aVertex3 + aVertOffset,
-                                        aFaceIdx));
-    }
+  for (Standard_Integer aTrgIdx = 0; aTrgIdx < aNumTrg; ++aTrgIdx)
+  {
+    myTrgIdxMap.Bind (aTrgIdx, aTrgIdx);
   }
 
   MarkDirty(); // needs BVH rebuilding
@@ -203,3 +252,95 @@ Standard_Boolean BRepExtrema_TriangleSet::Init (const BRepExtrema_ShapeList& the
   return Standard_True;
 }
 
+//=======================================================================
+//function : initFace
+//purpose  : Initializes triangle set
+//=======================================================================
+Standard_Boolean BRepExtrema_TriangleSet::initFace (const TopoDS_Face& theFace, const Standard_Integer theIndex)
+{
+  TopLoc_Location aLocation;
+
+  Handle(Poly_Triangulation) aTriangulation = BRep_Tool::Triangulation (theFace, aLocation);
+  if (aTriangulation.IsNull())
+  {
+    return Standard_False;
+  }
+
+  const Standard_Integer aVertOffset =
+    static_cast<Standard_Integer> (myVertexArray.size()) - 1;
+
+  initNodes (aTriangulation->MapNodeArray()->ChangeArray1(), aLocation.Transformation(), theIndex);
+
+  for (Standard_Integer aTriIdx = 1; aTriIdx <= aTriangulation->NbTriangles(); ++aTriIdx)
+  {
+    Standard_Integer aVertex1;
+    Standard_Integer aVertex2;
+    Standard_Integer aVertex3;
+
+    aTriangulation->Triangle (aTriIdx).Get (aVertex1,
+                                            aVertex2,
+                                            aVertex3);
+
+    myTriangles.push_back (BVH_Vec4i (aVertex1 + aVertOffset,
+                                      aVertex2 + aVertOffset,
+                                      aVertex3 + aVertOffset,
+                                      theIndex));
+  }
+
+  myNumTrgInShapeVec.SetValue (theIndex, aTriangulation->NbTriangles());
+
+  return Standard_True;
+}
+
+//=======================================================================
+//function : initEdge
+//purpose  : Initializes triangle set
+//=======================================================================
+Standard_Boolean BRepExtrema_TriangleSet::initEdge (const TopoDS_Edge& theEdge, const Standard_Integer theIndex)
+{
+  TopLoc_Location aLocation;
+
+  Handle(Poly_Polygon3D) aPolygon = BRep_Tool::Polygon3D (theEdge, aLocation);
+  if (aPolygon.IsNull())
+  {
+    return Standard_False;
+  }
+
+  const Standard_Integer aVertOffset =
+    static_cast<Standard_Integer> (myVertexArray.size()) - 1;
+
+  initNodes (aPolygon->Nodes(), aLocation.Transformation(), theIndex);
+
+  for (Standard_Integer aVertIdx = 1; aVertIdx < aPolygon->NbNodes(); ++aVertIdx)
+  {
+    // segment as degenerate triangle
+    myTriangles.push_back (BVH_Vec4i (aVertIdx + aVertOffset,
+                                      aVertIdx + aVertOffset + 1,
+                                      aVertIdx + aVertOffset + 1,
+                                      theIndex));
+  }
+  return Standard_True;
+}
+
+//=======================================================================
+//function : initNodes
+//purpose  : Initializes nodes
+//=======================================================================
+void BRepExtrema_TriangleSet::initNodes (const TColgp_Array1OfPnt& theNodes,
+                                         const gp_Trsf& theTrsf,
+                                         const Standard_Integer theIndex)
+{
+  for (Standard_Integer aVertIdx = 1; aVertIdx <= theNodes.Size(); ++aVertIdx)
+  {
+    gp_Pnt aVertex = theNodes.Value (aVertIdx);
+
+    aVertex.Transform (theTrsf);
+
+    myVertexArray.push_back (BVH_Vec3d (aVertex.X(),
+                                        aVertex.Y(),
+                                        aVertex.Z()));
+    myShapeIdxOfVtxVec.Append (theIndex);
+  }
+
+  myNumVtxInShapeVec.SetValue (theIndex, theNodes.Size());
+}

src/BRepExtrema/BRepExtrema_TriangleSet.hxx

@@ -16,11 +16,14 @@
 #ifndef _BRepExtrema_TriangleSet_HeaderFile
 #define _BRepExtrema_TriangleSet_HeaderFile
 
-#include <TopoDS_Face.hxx>
 #include <BVH_PrimitiveSet3d.hxx>
+#include <TColgp_Array1OfPnt.hxx>
+#include <TColStd_DataMapOfIntegerInteger.hxx>
+#include <TopoDS_Edge.hxx>
+#include <TopoDS_Face.hxx>
 
 //! List of shapes and their IDs for collision detection.
-typedef NCollection_Vector<TopoDS_Face> BRepExtrema_ShapeList;
+typedef NCollection_Vector<TopoDS_Shape> BRepExtrema_ShapeList;
 
 //! Triangle set corresponding to specific face.
 class BRepExtrema_TriangleSet : public BVH_PrimitiveSet3d
@@ -59,7 +62,10 @@ public:
   Standard_EXPORT void Clear();
 
   //! Initializes triangle set.
-  Standard_EXPORT Standard_Boolean Init (const BRepExtrema_ShapeList& theFaces);
+  Standard_EXPORT Standard_Boolean Init (const BRepExtrema_ShapeList& theShapes);
+
+  //! Returns all vertices.
+  Standard_EXPORT const BVH_Array3d& GetVertices() const { return myVertexArray; }
 
   //! Returns vertices of the given triangle.
   Standard_EXPORT void GetVertices (const Standard_Integer theIndex,
@@ -67,9 +73,37 @@ public:
                                     BVH_Vec3d&             theVertex2,
                                     BVH_Vec3d&             theVertex3) const;
 
+  //! Returns vertex indices of the given triangle.
+  Standard_EXPORT void GetVtxIndices (const Standard_Integer theIndex,
+                                      NCollection_Array1<Standard_Integer>& theVtxIndices) const;
+
   //! Returns face ID of the given triangle.
   Standard_EXPORT Standard_Integer GetFaceID (const Standard_Integer theIndex) const;
 
+  //! Returns shape ID of the given vertex index.
+  Standard_EXPORT Standard_Integer GetShapeIDOfVtx (const Standard_Integer theIndex) const;
+
+  //! Returns vertex index in tringulation of the shape, which vertex belongs,
+  //! with the given vtx ID in whole set.
+  Standard_EXPORT Standard_Integer GetVtxIdxInShape (const Standard_Integer theIndex) const;
+
+  //! Returns triangle index (before swapping) in tringulation of the shape, which triangle belongs,
+  //! with the given trg ID in whole set (after swapping).
+  Standard_EXPORT Standard_Integer GetTrgIdxInShape (const Standard_Integer theIndex) const;
+
+private:
+
+  //! Initializes triangle set from the face
+  Standard_Boolean initFace (const TopoDS_Face& theFace, const Standard_Integer theIndex);
+
+  //! Initializes polygon from the edge
+  Standard_Boolean initEdge (const TopoDS_Edge& theEdge, const Standard_Integer theIndex);
+
+  //! Initializes nodes
+  void initNodes (const TColgp_Array1OfPnt& theNodes,
+                  const gp_Trsf& theTrsf,
+                  const Standard_Integer theIndex);
+
 protected:
 
   //! Array of vertex indices.
@@ -78,6 +112,19 @@ protected:
   //! Array of vertex coordinates.
   BVH_Array3d myVertexArray;
 
+  //! Vector of shapes' indices where index of item corresponds to index of vertex,
+  //! belonging to this shape.
+  NCollection_Vector<Standard_Integer> myShapeIdxOfVtxVec;
+
+  //! Vector of vertexes' number belonging to shape which index corresponds item's index.
+  NCollection_Vector<Standard_Integer> myNumVtxInShapeVec;
+
+  //! Vector of triangles' number belonging to shape which index corresponds item's index.
+  NCollection_Vector<Standard_Integer> myNumTrgInShapeVec;
+
+  //! Map of triangles' indices after (key) and before (value) swapping.
+  TColStd_DataMapOfIntegerInteger myTrgIdxMap;
+
 public:
 
   DEFINE_STANDARD_RTTIEXT(BRepExtrema_TriangleSet, BVH_PrimitiveSet3d)

src/BRepExtrema/FILES

@@ -18,6 +18,10 @@ BRepExtrema_OverlapTool.cxx
 BRepExtrema_OverlapTool.hxx
 BRepExtrema_Poly.cxx
 BRepExtrema_Poly.hxx
+BRepExtrema_ProximityValueTool.cxx
+BRepExtrema_ProximityValueTool.hxx
+BRepExtrema_ProximityDistTool.cxx
+BRepExtrema_ProximityDistTool.hxx
 BRepExtrema_SelfIntersection.cxx
 BRepExtrema_SelfIntersection.hxx
 BRepExtrema_SeqOfSolution.hxx

src/BRepFill/BRepFill_AdvancedEvolved.cxx

@@ -44,6 +44,8 @@
 #include <BRepGProp_Face.hxx>
 #include <BRep_TEdge.hxx>
 #include <ShapeUpgrade_UnifySameDomain.hxx>
+#include <Bnd_Box.hxx>
+#include <BRepBndLib.hxx>
 
 #ifdef BRepFill_AdvancedEvolved_DEBUG
 #include <BinTools.hxx>
@@ -524,9 +526,14 @@ void BRepFill_AdvancedEvolved::GetLids()
     return;
   }
 
+  Standard_Real aTol = Max(aFS.Tolerance(), aFS.ToleranceReached());
+  aTol += myFuzzyValue;
+  Bnd_Box aProfBox;
+  BRepBndLib::Add(myProfile, aProfBox);
+  Standard_Real aSqDiag = aProfBox.SquareExtent();
   //Square of the default angular tolerance in
   //BOPAlgo_Tools::EdgesToWires(...) and BOPAlgo_Tools::WiresToFaces(...) methods
-  const Standard_Real aSqAnguarTol = 1.0e-16;
+  const Standard_Real aSqAnguarTol = aTol*aTol / aSqDiag;
   const gp_Dir &aNormal = aSurf->Position().Direction();
 
   // Obtain free-edges from myPipeShell. All edges must be planar
@@ -541,6 +548,7 @@ void BRepFill_AdvancedEvolved::GetLids()
   gp_Pnt aPtmp;
   gp_Vec aTan;
 
+  Standard_Real aDPMax = 0.;
   for (Standard_Integer i = 1; i <= aMapEF.Size(); i++)
   {
     TopTools_ListOfShape& aListF = aMapEF(i);
@@ -564,6 +572,8 @@ void BRepFill_AdvancedEvolved::GetLids()
       continue;
 
     const Standard_Real aDP = aTan.XYZ().Dot(aNormal.XYZ());
+    if (Abs(aDP) > aDPMax)
+      aDPMax = Abs(aDP);
     if (aDP*aDP>aSqModulus*aSqAnguarTol)
     {
       //Only planar edges are considered
@@ -594,8 +604,9 @@ void BRepFill_AdvancedEvolved::GetLids()
   aBB.MakeCompound(aCompW);
   aBB.MakeCompound(aCompF);
   aBB.MakeCompound(myTopBottom);
-  BOPAlgo_Tools::EdgesToWires(aFreeEdges, aCompW, Standard_True);
-  BOPAlgo_Tools::WiresToFaces(aCompW, aCompF);
+  Standard_Real anAngTol = Sqrt(aSqAnguarTol);
+  BOPAlgo_Tools::EdgesToWires(aFreeEdges, aCompW, Standard_True, anAngTol);
+  BOPAlgo_Tools::WiresToFaces(aCompW, aCompF, anAngTol);
 
   {
     // Check orientation

src/BRepFill/BRepFill_CompatibleWires.cxx

@@ -656,7 +656,7 @@ static void BuildConnectedEdges(const TopoDS_Wire& aWire,
 //=======================================================================
 
 BRepFill_CompatibleWires::BRepFill_CompatibleWires() 
-:myIsDone(Standard_False)
+:myStatus(BRepFill_ThruSectionErrorStatus_NotDone)
 {
 }
 
@@ -682,7 +682,7 @@ void BRepFill_CompatibleWires::Init(const TopTools_SequenceOfShape& Sections)
   myInit = Sections;
   myWork = Sections;
   myPercent = 0.01;
-  myIsDone = Standard_False;
+  myStatus = BRepFill_ThruSectionErrorStatus_NotDone;
   myMap.Clear();
 
 }
@@ -707,7 +707,7 @@ void BRepFill_CompatibleWires::SetPercent(const Standard_Real Percent)
 
 Standard_Boolean BRepFill_CompatibleWires::IsDone() const 
 {
-  return myIsDone;
+  return myStatus == BRepFill_ThruSectionErrorStatus_Done;
 }
 
 
@@ -766,6 +766,7 @@ Standard_Boolean BRepFill_CompatibleWires::IsDegeneratedLastSection() const
 
 void BRepFill_CompatibleWires::Perform (const Standard_Boolean WithRotation)
 {
+  myStatus = BRepFill_ThruSectionErrorStatus_Done;
   // compute origin and orientation on wires to avoid twisted results
   // and update wires to have same number of edges
 
@@ -838,7 +839,7 @@ void BRepFill_CompatibleWires::Perform (const Standard_Boolean WithRotation)
     allClosed = (allClosed && wClosed);
     allOpen = (allOpen && !wClosed);
   }
-  
+
   if (allClosed) {
     // All sections are closed 
     if (report) {
@@ -849,24 +850,26 @@ void BRepFill_CompatibleWires::Perform (const Standard_Boolean WithRotation)
       // origin
       ComputeOrigin(Standard_False);
     }
-    myIsDone = Standard_True;
   }
   else if (allOpen) {
     // All sections are open
     // origin
     SearchOrigin();
+    if (myStatus != BRepFill_ThruSectionErrorStatus_Done)
+    {
+      return;
+    }
     // same number of elements
     if (report) {
       SameNumberByACR(report);
     }
-    myIsDone = Standard_True;
   }
   else {
     // There are open and closed sections :
     // not processed
-    throw Standard_DomainError("Sections must be all closed or all open");
+    myStatus = BRepFill_ThruSectionErrorStatus_NotSameTopology;
+    return;
   }
-  
 }
 
 
@@ -906,7 +909,10 @@ void BRepFill_CompatibleWires::
     //allClosed = (allClosed && myWork(i).Closed());
   }
   if (!allClosed)
-    throw Standard_NoSuchObject("BRepFill_CompatibleWires::SameNumberByPolarMethod : the wires must be closed");
+  {
+    myStatus = BRepFill_ThruSectionErrorStatus_NotSameTopology;
+    return;
+  }
   
   // sections ponctuelles, sections bouclantes ?
   if (myDegen1) ideb++;
@@ -986,8 +992,11 @@ void BRepFill_CompatibleWires::
     
     // sequence of vertices of the first wire
     SeqOfVertices(wire1,SeqV);
-    if (SeqV.Length()>NbMaxV) 
-      throw Standard_NoSuchObject("BRepFill::SameNumberByPolarMethod failed");
+    if (SeqV.Length() > NbMaxV)
+    {
+      myStatus = BRepFill_ThruSectionErrorStatus_Failed;
+      return;
+    }
     
     // loop on vertices of wire1
     for (ii=1;ii<=SeqV.Length();ii++) {
@@ -1062,7 +1071,10 @@ void BRepFill_CompatibleWires::
     // sequence of vertices of the first wire
     SeqOfVertices(wire1,SeqV);
     if ( SeqV.Length()>NbMaxV || SeqV.Length()>SizeMap ) 
-      throw Standard_NoSuchObject("BRepFill::SameNumberByPolarMethod failed");
+    {
+      myStatus = BRepFill_ThruSectionErrorStatus_Failed;
+      return;
+    }
     
 
     // next wire 
@@ -1184,14 +1196,17 @@ void BRepFill_CompatibleWires::
 	}
       } //end of for(; itW.More(); itW.Next())
     if (Esol.IsNull())
-      throw Standard_ConstructionError("BRepFill :: profiles are inconsistent");
+    {
+      myStatus = BRepFill_ThruSectionErrorStatus_ProfilesInconsistent;
+      return;
+    }
     MW.Add(Esol);
 
     TopTools_ListOfShape ConnectedEdges;
     BuildConnectedEdges( TopoDS::Wire(myWork(i)), Esol, V2, ConnectedEdges );
 
     TopTools_ListIteratorOfListOfShape itCE(ConnectedEdges);
-    for(; anExp.More(), itCE.More(); anExp.Next(), itCE.Next())
+    for(; anExp.More() && itCE.More(); anExp.Next(), itCE.Next())
       {
 	ECur = anExp.Current();
 	TopExp::Vertices(ECur,VF,VL,Standard_True);
@@ -1264,8 +1279,10 @@ void BRepFill_CompatibleWires::
     if (nbmax<nbEdges) nbmax = nbEdges;
     if (nbmin>nbEdges) nbmin = nbEdges;
   }
-  if (nbmin!=nbmax) {
-    throw Standard_NoSuchObject("BRepFill_CompatibleWires::SameNumberByPolarMethod failed");
+  if (nbmin!=nbmax) 
+  {
+    myStatus = BRepFill_ThruSectionErrorStatus_Failed;
+    return;
   }
 
   //Fill <myMap>
@@ -1487,7 +1504,10 @@ void BRepFill_CompatibleWires::SameNumberByACR(const  Standard_Boolean  report)
     if (nbmin>nbEdges(i)) nbmin = nbEdges(i);
   }
   if (nbmax!=nbmin) 
-    throw Standard_NoSuchObject("BRepFill_CompatibleWires::SameNumberByACR failed");
+  {
+    myStatus = BRepFill_ThruSectionErrorStatus_Failed;
+    return;
+  }
 }
 
 //=======================================================================
@@ -1532,7 +1552,10 @@ void BRepFill_CompatibleWires::ComputeOrigin(const  Standard_Boolean /*polar*/ )
   }
 */
   if (!allClosed) 
-    throw Standard_NoSuchObject("BRepFill_CompatibleWires::ComputeOrigin : the wires must be closed");
+  {
+    myStatus = BRepFill_ThruSectionErrorStatus_NotSameTopology;
+    return;
+  }
 
 /*  
   // Max number of possible cuts
@@ -1869,7 +1892,10 @@ void BRepFill_CompatibleWires::ComputeOrigin(const  Standard_Boolean /*polar*/ )
       gp_Pnt Pmini,P1,P2;
       SeqOfVertices(wire,SeqV);
       if (SeqV.Length()>NbMaxV) 
-	throw Standard_NoSuchObject("BRepFill::ComputeOrigin failed");
+      {
+        myStatus = BRepFill::ThruSectionsError_Failed;
+        return;
+      }
       if (!polar) {
 	// choix du vertex le plus proche comme origine
 	distmini = Precision::Infinite();
@@ -2094,7 +2120,10 @@ void BRepFill_CompatibleWires::SearchOrigin()
     allOpen = (allOpen && !myWork(i).Closed());
   }
   if (!allOpen)
-    throw Standard_NoSuchObject("BRepFill_CompatibleWires::SearchOrigin : the wires must be open");
+  {
+    myStatus = BRepFill_ThruSectionErrorStatus_NotSameTopology;
+    return;
+  }
 
   // init
 

src/BRepFill/BRepFill_CompatibleWires.hxx

@@ -20,6 +20,7 @@
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 
+#include <BRepFill_ThruSectionErrorStatus.hxx>
 #include <TopTools_SequenceOfShape.hxx>
 #include <TopTools_DataMapOfShapeListOfShape.hxx>
 #include <TopTools_ListOfShape.hxx>
@@ -49,6 +50,11 @@ public:
   Standard_EXPORT void Perform (const Standard_Boolean WithRotation = Standard_True);
   
   Standard_EXPORT Standard_Boolean IsDone() const;
+
+  BRepFill_ThruSectionErrorStatus GetStatus() const
+  {
+    return myStatus;
+  }
   
   //! returns the generated sequence.
   Standard_EXPORT const TopTools_SequenceOfShape& Shape() const;
@@ -101,7 +107,7 @@ private:
   Standard_Real myPercent;
   Standard_Boolean myDegen1;
   Standard_Boolean myDegen2;
-  Standard_Boolean myIsDone;
+  BRepFill_ThruSectionErrorStatus myStatus;
   TopTools_DataMapOfShapeListOfShape myMap;
 
 

src/BRepFill/BRepFill_Generator.cxx

@@ -65,6 +65,7 @@ Standard_Integer DetectKPart(const TopoDS_Edge& Edge1,
 			     const TopoDS_Edge& Edge2)
 {
   // initializations
+  // !Note if IType set as -1 it means that occurs error with null 3d curve for the edge
   Standard_Integer IType = 0;
 
   // characteristics of the first edge
@@ -89,7 +90,9 @@ Standard_Integer DetectKPart(const TopoDS_Edge& Edge1,
   else {
     curv1 = BRep_Tool::Curve(Edge1, loc, first1, last1);
     if (curv1.IsNull())
-      throw Standard_NullObject("Null 3D curve in edge");
+    {
+      return -1;
+    }
     curv1 = 
       Handle(Geom_Curve)::DownCast(curv1->Transformed(loc.Transformation()));
     ff = first1;
@@ -156,7 +159,9 @@ Standard_Integer DetectKPart(const TopoDS_Edge& Edge1,
     else {
       curv = BRep_Tool::Curve(Edge2, loc, first2, last2);
       if (curv.IsNull())
-        throw Standard_NullObject("Null 3D curve in edge");
+      {
+        return -1;
+      }
       curv = 
 	Handle(Geom_Curve)::DownCast(curv->Transformed(loc.Transformation()));
       ff = first2;
@@ -312,12 +317,12 @@ Standard_Integer DetectKPart(const TopoDS_Edge& Edge1,
 
 //=======================================================================
 //function : CreateKPart
-//purpose  : 
+//purpose  : Returns true if there is no errors occur
 //=======================================================================
 
-void CreateKPart(const TopoDS_Edge& Edge1,const TopoDS_Edge& Edge2,
-		 const Standard_Integer IType, 
-		 Handle(Geom_Surface)& Surf)
+Standard_Boolean CreateKPart (const TopoDS_Edge& Edge1,const TopoDS_Edge& Edge2,
+                              const Standard_Integer IType, 
+                              Handle(Geom_Surface)& Surf)
 {
   // find the dimension
   TopoDS_Vertex V1, V2;
@@ -326,6 +331,8 @@ void CreateKPart(const TopoDS_Edge& Edge1,const TopoDS_Edge& Edge2,
   Standard_Real a1, b1, aa =0., bb =0.;
   TopoDS_Vertex v1f,v1l,v2f,v2l;
 
+  Standard_Boolean isDone = Standard_True;
+
   // find characteristics of the first edge
   Handle(Geom_Curve) C1;
   Standard_Boolean degen1 = BRep_Tool::Degenerated(Edge1);
@@ -336,7 +343,9 @@ void CreateKPart(const TopoDS_Edge& Edge1,const TopoDS_Edge& Edge2,
   else {
     C1 = BRep_Tool::Curve(Edge1, loc, a1, b1);
     if (C1.IsNull())
-      throw Standard_NullObject("Null 3D curve in edge");
+    {
+      return Standard_False;
+    }
     C1 = Handle(Geom_Curve)::DownCast(C1->Transformed(loc.Transformation()));
     aa = a1;
     bb = b1;
@@ -361,7 +370,9 @@ void CreateKPart(const TopoDS_Edge& Edge1,const TopoDS_Edge& Edge2,
   else {
     C2 = BRep_Tool::Curve(Edge2, loc, a1, b1);
     if (C2.IsNull())
-      throw Standard_NullObject("Null 3D curve in edge");
+    {
+      return Standard_False;
+    }
     C2 = Handle(Geom_Curve)::DownCast(C2->Transformed(loc.Transformation()));
     if (Edge2.Orientation() == TopAbs_REVERSED) {
       C2->Reverse();
@@ -496,6 +507,7 @@ void CreateKPart(const TopoDS_Edge& Edge1,const TopoDS_Edge& Edge2,
     // IType incorrect
   }
   Surf = surface;
+  return isDone;
 }
 
 //=======================================================================
@@ -528,7 +540,8 @@ static TopoDS_Edge CreateNewEdge(const TopoDS_Edge& theEdge, TopTools_DataMapOfS
 //=======================================================================
 
 BRepFill_Generator::BRepFill_Generator(): 
-  myMutableInput (Standard_True)
+  myMutableInput (Standard_True),
+  myStatus (BRepFill_ThruSectionErrorStatus_NotDone)
 {
 }
 
@@ -551,6 +564,8 @@ void BRepFill_Generator::AddWire(const TopoDS_Wire& Wire)
 
 void BRepFill_Generator::Perform()
 {
+  myStatus = BRepFill_ThruSectionErrorStatus_Done;
+
   TopoDS_Shell Shell;
   TopoDS_Face  Face;
   TopoDS_Shape S1, S2;
@@ -679,6 +694,12 @@ void BRepFill_Generator::Perform()
 
       // processing of KPart
       Standard_Integer IType = DetectKPart(Edge1,Edge2);
+      if (IType == -1)
+      {
+        myStatus = BRepFill_ThruSectionErrorStatus_Null3DCurve;
+        return;
+      }
+
       if (IType==0) {
 	// no part cases
 	TopLoc_Location L,L1,L2;
@@ -694,7 +715,10 @@ void BRepFill_Generator::Perform()
 	else {
 	  C1 = BRep_Tool::Curve(Edge1,L1,f1,l1);
           if (C1.IsNull())
-            throw Standard_NullObject("Null 3D curve in edge");
+          {
+            myStatus = BRepFill_ThruSectionErrorStatus_Null3DCurve;
+            return;
+          }
 	}
 	if (degen2) {
 	  Extremities(1) = BRep_Tool::Pnt(V2l);
@@ -704,7 +728,10 @@ void BRepFill_Generator::Perform()
 	else {
 	  C2 = BRep_Tool::Curve(Edge2,L2,f2,l2);
           if (C2.IsNull())
-            throw Standard_NullObject("Null 3D curve in edge");
+          {
+            myStatus = BRepFill_ThruSectionErrorStatus_Null3DCurve;
+            return;
+          }
 	}
 	
 	// compute the location
@@ -746,7 +773,11 @@ void BRepFill_Generator::Perform()
       }
       else {
 	// particular case
-	CreateKPart(Edge1,Edge2,IType,Surf);
+        if (!CreateKPart(Edge1, Edge2, IType, Surf))
+        {
+          myStatus = BRepFill_ThruSectionErrorStatus_Null3DCurve;
+          return;
+        }
 	B.MakeFace(Face,Surf,Precision::Confusion());
       }
       

src/BRepFill/BRepFill_Generator.hxx

@@ -20,6 +20,7 @@
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 
+#include <BRepFill_ThruSectionErrorStatus.hxx>
 #include <TopTools_SequenceOfShape.hxx>
 #include <TopoDS_Shell.hxx>
 #include <TopTools_DataMapOfShapeListOfShape.hxx>
@@ -68,6 +69,12 @@ public:
   //! Returns the current mutable input state
   Standard_EXPORT Standard_Boolean IsMutableInput() const;
 
+  //! Returns status of the operation
+  BRepFill_ThruSectionErrorStatus GetStatus() const
+  {
+    return myStatus;
+  }
+
 protected:
 
 private:
@@ -78,6 +85,7 @@ private:
   TopTools_DataMapOfShapeShape myOldNewShapes;
   BRepTools_ReShape myReshaper;
   Standard_Boolean myMutableInput;
+  BRepFill_ThruSectionErrorStatus myStatus;
 
 };
 

src/BRepFill/BRepFill_Sweep.cxx

@@ -3002,7 +3002,7 @@ void BRepFill_Sweep::Build(TopTools_MapOfShape& ReversedEdges,
         }
       }
 
-    if (aNbFaces == 0)
+    if ((NbTrous > 0) ? (aNbFaces < NbLaw) : (aNbFaces == 0))
     {
       isDone = Standard_False;
       return;

src/BRepFill/BRepFill_ThruSectionErrorStatus.hxx

@@ -0,0 +1,29 @@
+// Copyright (c) 2022 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#ifndef _BRepFill_ThruSectionErrorStatus_HeaderFile
+#define _BRepFill_ThruSectionErrorStatus_HeaderFile
+
+//! Errors that can occur at thrusection algorithm.
+enum BRepFill_ThruSectionErrorStatus
+{
+  BRepFill_ThruSectionErrorStatus_Done,                     //!< Thrusection algorithm is done
+  BRepFill_ThruSectionErrorStatus_NotDone,                  //!< Thrusection algorithm is not done
+  BRepFill_ThruSectionErrorStatus_NotSameTopology,          //!< All profiles have not same topology (they should be all closed or all opened)
+  BRepFill_ThruSectionErrorStatus_ProfilesInconsistent,     //!< Profiles are inconsistent 
+  BRepFill_ThruSectionErrorStatus_WrongUsage,               //!< Wrong usage of punctual sections
+  BRepFill_ThruSectionErrorStatus_Null3DCurve,              //!< Null 3D curve in edge
+  BRepFill_ThruSectionErrorStatus_Failed                    //!< Thrusection algorithm has failed
+};
+
+#endif // _BRepFill_ThruSectionErrorStatus_HeaderFile

src/BRepFill/BRepFill_TrimShellCorner.cxx

@@ -56,6 +56,7 @@
 #include <TopTools_MapOfShape.hxx>
 #include <TopTools_SequenceOfShape.hxx>
 #include <BRepExtrema_ExtCC.hxx>
+#include <ShapeFix_Edge.hxx>
 
 static TopoDS_Edge FindEdgeCloseToBisectorPlane(const TopoDS_Vertex& theVertex,
                                                 TopoDS_Compound&     theComp,
@@ -534,6 +535,26 @@ BRepFill_TrimShellCorner::MakeFacesNonSec(const Standard_Integer
 
     if(bHasNewEdge) {
       aNewEdge.Orientation(TopAbs_FORWARD);
+
+      // Refer to BrepFill_Sweep.cxx BuildEdge Construct an edge via an iso
+      gp_Pnt P1, P2;
+      Standard_Real p11, p12, p21, p22;
+      P1 = BRep_Tool::Pnt(TopExp::FirstVertex(TopoDS::Edge(aNewEdge)));
+      P2 = BRep_Tool::Pnt(TopExp::LastVertex(TopoDS::Edge(aNewEdge)));
+
+      TopoDS_Edge aERef = TopoDS::Edge(fit == 1 ? aE1 : aE2);
+      p11 = P1.Distance(BRep_Tool::Pnt(TopExp::FirstVertex(aERef)));
+      p22 = P2.Distance(BRep_Tool::Pnt(TopExp::LastVertex(aERef)));
+      p12 = P1.Distance(BRep_Tool::Pnt(TopExp::LastVertex(aERef)));
+      p21 = P2.Distance(BRep_Tool::Pnt(TopExp::FirstVertex(aERef)));
+
+      if (p11 > p12 && p22 > p21) {
+        aNewEdge.Reverse();
+      }
+
+      // for nonPlane surface, we should add pCurve
+      Handle(ShapeFix_Edge) sfe = new ShapeFix_Edge();
+      sfe->FixAddPCurve(aNewEdge, TopoDS::Face(aFace), Standard_False);
     }
 
     TopTools_ListOfShape aOrderedList;

src/BRepFill/FILES

@@ -77,6 +77,7 @@ BRepFill_ShapeLaw.hxx
 BRepFill_ShapeLaw.lxx
 BRepFill_Sweep.cxx
 BRepFill_Sweep.hxx
+BRepFill_ThruSectionErrorStatus.hxx
 BRepFill_TransitionStyle.hxx
 BRepFill_TrimEdgeTool.cxx
 BRepFill_TrimEdgeTool.hxx

src/BRepFilletAPI/BRepFilletAPI_MakeFillet.cxx

@@ -44,13 +44,13 @@ BRepFilletAPI_MakeFillet::BRepFilletAPI_MakeFillet(const TopoDS_Shape& S,
 //=======================================================================
 
 void BRepFilletAPI_MakeFillet::SetParams(const Standard_Real Tang, 
-					 const Standard_Real Tesp, 
-					 const Standard_Real T2d, 
-					 const Standard_Real TApp3d, 
-					 const Standard_Real TolApp2d, 
-					 const Standard_Real Fleche)
+                                         const Standard_Real Tesp, 
+                                         const Standard_Real T2d, 
+                                         const Standard_Real TApp3d,
+                                         const Standard_Real TolApp2d, 
+                                         const Standard_Real Fleche)
 {
-  myBuilder.SetParams(Tang,Tesp, T2d, TApp3d, TolApp2d, Fleche);
+  myBuilder.SetParams(Tang, Tesp, T2d, TApp3d, TolApp2d, Fleche);
 }
 
 //=======================================================================

src/BRepLib/BRepLib.cxx

@@ -802,7 +802,7 @@ static void GetEdgeTol(const TopoDS_Edge& theEdge,
     }
     if(temp > d2) d2 = temp;
   }
-  d2 = 1.5*sqrt(d2);
+  d2 = 1.05*sqrt(d2);
   theEdTol = d2;
 }
 
@@ -884,10 +884,6 @@ static void UpdShTol(const TopTools_DataMapOfShapeReal& theShToTol,
     case TopAbs_VERTEX: 
       {
         const Handle(BRep_TVertex)& aTV = *((Handle(BRep_TVertex)*)&aNsh.TShape());
-        //
-        if(aTV->Locked())
-          throw TopoDS_LockedShape("BRep_Builder::UpdateVertex");
-        //
         if (theVForceUpdate)
           aTV->Tolerance(aTol);
         else
@@ -965,6 +961,9 @@ static void InternalSameParameter(const TopoDS_Shape& theSh, BRepTools_ReShape&
     TopExp_Explorer ex2;
     for(ex2.Init(curface,TopAbs_EDGE); ex2.More(); ex2.Next()){
       const TopoDS_Edge& E = TopoDS::Edge(ex2.Current());
+      if (BRep_Tool::Degenerated(E))
+        continue;
+
       TopoDS_Shape aNe = theReshaper.Value(E);
       Standard_Real aNewEtol = -1;
       GetEdgeTol(TopoDS::Edge(aNe), curface, aNewEtol);
@@ -1709,8 +1708,8 @@ static void InternalUpdateTolerances(const TopoDS_Shape& theOldShape,
   for (iCur=1; iCur<=nbV; iCur++) {
     tol=0;
     const TopoDS_Vertex& V = TopoDS::Vertex(parents.FindKey(iCur));
-    Bnd_Box box;
-    box.Add(BRep_Tool::Pnt(V));
+    gp_Pnt aPV = BRep_Tool::Pnt(V);
+    Standard_Real aMaxDist = 0.;
     gp_Pnt p3d;
     for (lConx.Initialize(parents(iCur)); lConx.More(); lConx.Next()) {
       const TopoDS_Edge& E = TopoDS::Edge(lConx.Value());
@@ -1732,8 +1731,10 @@ static void InternalUpdateTolerances(const TopoDS_Shape& theOldShape,
           if (!C.IsNull()) { // edge non degenerated
             p3d = C->Value(par);
             p3d.Transform(L.Transformation());
-            box.Add(p3d);
-          }
+            Standard_Real aDist = p3d.SquareDistance(aPV);
+            if (aDist > aMaxDist)
+              aMaxDist = aDist;
+           }
         }
         else if (cr->IsCurveOnSurface()) {
           const Handle(Geom_Surface)& Su = cr->Surface();
@@ -1745,21 +1746,22 @@ static void InternalUpdateTolerances(const TopoDS_Shape& theOldShape,
           gp_Pnt2d p2d = PC->Value(par);
           p3d = Su->Value(p2d.X(),p2d.Y());
           p3d.Transform(L.Transformation());
-          box.Add(p3d);
+          Standard_Real aDist = p3d.SquareDistance(aPV);
+          if (aDist > aMaxDist)
+            aMaxDist = aDist;
           if (!PC2.IsNull()) {
             p2d = PC2->Value(par);
             p3d = Su->Value(p2d.X(),p2d.Y());
             p3d.Transform(L.Transformation());
-            box.Add(p3d);
+            aDist = p3d.SquareDistance(aPV);
+            if (aDist > aMaxDist)
+              aMaxDist = aDist;
           }
         }
         itcr.Next();
       }
     }
-    Standard_Real aXmin, aYmin, aZmin, aXmax, aYmax, aZmax;
-    box.Get(aXmin, aYmin, aZmin, aXmax, aYmax, aZmax);
-    aXmax -= aXmin; aYmax -= aYmin; aZmax -= aZmin;
-    tol = Max(tol,sqrt(aXmax*aXmax+aYmax*aYmax+aZmax*aZmax));
+    tol = Max(tol, sqrt(aMaxDist));
     tol += 2.*Epsilon(tol);
     //
     Standard_Real aVTol = BRep_Tool::Tolerance(V);

src/BRepLib/BRepLib_FindSurface.cxx

@@ -506,7 +506,14 @@ void BRepLib_FindSurface::Init(const TopoDS_Shape&    S,
 
   if (!isSolved)
     return;
-
+  //Removing very small values
+  Standard_Real aMaxV = Max(Abs(aVec(1)), Max(Abs(aVec(2)), Abs(aVec(3))));
+  Standard_Real eps = Epsilon(aMaxV);
+  for (i = 1; i <= 3; ++i)
+  {
+    if (Abs(aVec(i)) <= eps)
+      aVec(i) = 0.;
+  }
   gp_Vec aN (aVec (1), aVec (2), aVec (3));
   Handle(Geom_Plane) aPlane = new Geom_Plane (aBaryCenter, aN);
   myTolReached = Controle (aPoints, aPlane);

src/BRepLib/BRepLib_MakeFace.cxx

@@ -256,7 +256,7 @@ BRepLib_MakeFace::BRepLib_MakeFace(const TopoDS_Wire& W,
     myError = BRepLib_NotPlanar;
     return;
   }
- 
+
   // build the face and add the wire
   BRep_Builder B;
   myError = BRepLib_FaceDone;
@@ -264,13 +264,40 @@ BRepLib_MakeFace::BRepLib_MakeFace(const TopoDS_Wire& W,
   Standard_Real tol = Max(1.2*FS.ToleranceReached(), FS.Tolerance());
 
   B.MakeFace(TopoDS::Face(myShape),FS.Surface(),FS.Location(),tol);
-  Add(W);
+
+  TopoDS_Wire aW;
+  if (OnlyPlane)
+  {
+    // get rid of degenerative edges in the input wire
+    BRep_Builder aB;
+    aB.MakeWire (aW);
+
+    TopoDS_Wire aWForw = W;
+    aWForw.Orientation (TopAbs_FORWARD);
+    TopoDS_Iterator anIter (aWForw);
+    for (; anIter.More(); anIter.Next())
+    {
+      const TopoDS_Edge& aE = TopoDS::Edge (anIter.Value());
+
+      if (!BRep_Tool::Degenerated (aE))
+        aB.Add (aW, aE);
+    }
+
+    aW.Orientation (W.Orientation()); // return to original orient
+    aW.Closed (W.Closed());
+  }
+  else
+  {
+    aW = W;
+  }
+
+  Add (aW);
   //
   BRepLib::UpdateTolerances(myShape);
   //
   BRepLib::SameParameter(myShape, tol, Standard_True);
   //
-  if (BRep_Tool::IsClosed(W))
+  if (BRep_Tool::IsClosed(aW))
     CheckInside();
 }
 

src/BRepMesh/BRepMesh_ConeRangeSplitter.cxx

@@ -41,10 +41,13 @@ std::pair<Standard_Real, Standard_Real> BRepMesh_ConeRangeSplitter::GetSplitStep
 
   const Standard_Real aDiffU = aRangeU.second - aRangeU.first;
   const Standard_Real aDiffV = aRangeV.second - aRangeV.first;
-  Standard_Integer nbU = (Standard_Integer) (aDiffU / Du);
-  Standard_Integer nbV = (Standard_Integer) (nbU * (aDiffV) / (aDiffU * aRadius));
+  const Standard_Real aScale = (Du * aRadius);
+  const Standard_Real aRatio = Max(1., Log(aDiffV / aScale));
+  const Standard_Integer nbU = (Standard_Integer)(aDiffU / Du);
+  const Standard_Integer nbV = (Standard_Integer)(aDiffV / aScale / aRatio);
+
   Du = aDiffU / (nbU + 1);
-  Dv = aDiffV / (nbV + 1);
+  Dv = aDiffV / (nbV + static_cast<Standard_Integer>(aRatio));
 
   theStepsNb.first  = nbU;
   theStepsNb.second = nbV;

src/BRepMesh/BRepMesh_CurveTessellator.cxx

@@ -35,11 +35,15 @@ IMPLEMENT_STANDARD_RTTIEXT(BRepMesh_CurveTessellator, IMeshTools_CurveTessellato
 //=======================================================================
 BRepMesh_CurveTessellator::BRepMesh_CurveTessellator(
   const IMeshData::IEdgeHandle& theEdge,
-  const IMeshTools_Parameters&  theParameters)
+  const IMeshTools_Parameters&  theParameters,
+  const Standard_Integer        theMinPointsNb,
+  const Standard_Boolean        isUseVertexTolerance)
   : myDEdge(theEdge),
     myParameters(theParameters),
+    myUseVertexTolerance(isUseVertexTolerance),
     myEdge(theEdge->GetEdge()),
-    myCurve(myEdge)
+    myCurve(myEdge),
+    myMinPointsNb (theMinPointsNb)
 {
   init();
 }
@@ -52,11 +56,15 @@ BRepMesh_CurveTessellator::BRepMesh_CurveTessellator (
   const IMeshData::IEdgeHandle& theEdge,
   const TopAbs_Orientation      theOrientation,
   const IMeshData::IFaceHandle& theFace,
-  const IMeshTools_Parameters&  theParameters)
+  const IMeshTools_Parameters&  theParameters,
+  const Standard_Integer        theMinPointsNb,
+  const Standard_Boolean        isUseVertexTolerance)
   : myDEdge(theEdge),
     myParameters(theParameters),
+    myUseVertexTolerance(isUseVertexTolerance),
     myEdge(TopoDS::Edge(theEdge->GetEdge().Oriented(theOrientation))),
-    myCurve(myEdge, theFace->GetFace())
+    myCurve(myEdge, theFace->GetFace()),
+    myMinPointsNb (theMinPointsNb)
 {
   init();
 }
@@ -97,8 +105,21 @@ void BRepMesh_CurveTessellator::init()
   myEdgeSqTol  = BRep_Tool::Tolerance (myEdge);
   myEdgeSqTol *= myEdgeSqTol;
 
-  const Standard_Integer aMinPntNb = (myCurve.GetType() == GeomAbs_Circle) ? 4 : 2; //OCC287
+  Standard_Integer aMinPntThreshold = 2;
+  switch (myCurve.GetType())
+  {
+    case GeomAbs_Circle:
+    case GeomAbs_Ellipse:
+    case GeomAbs_Parabola:
+    case GeomAbs_Hyperbola:
+      aMinPntThreshold = 4;
+      break;
 
+    default:
+      break;
+  }
+
+  const Standard_Integer aMinPntNb = Max (myMinPointsNb, aMinPntThreshold); //OCC287
   myDiscretTool.Initialize (myCurve,
                             myCurve.FirstParameter(), myCurve.LastParameter(),
                             aPreciseAngDef, aPreciseLinDef, aMinPntNb,
@@ -208,10 +229,15 @@ Standard_Boolean BRepMesh_CurveTessellator::isInToleranceOfVertex (
   const gp_Pnt&        thePoint,
   const TopoDS_Vertex& theVertex) const
 {
-  const gp_Pnt        aPoint     = BRep_Tool::Pnt(theVertex);
-  const Standard_Real aTolerance = BRep_Tool::Tolerance(theVertex);
+  if (myUseVertexTolerance)
+  {
+    const gp_Pnt        aPoint     = BRep_Tool::Pnt(theVertex);
+    const Standard_Real aTolerance = BRep_Tool::Tolerance(theVertex) * 1.1;
 
-  return (thePoint.SquareDistance (aPoint) < aTolerance * aTolerance);
+    return (thePoint.SquareDistance (aPoint) < aTolerance * aTolerance);
+  }
+
+  return Standard_False;
 }
 
 //=======================================================================
@@ -226,9 +252,9 @@ Standard_Boolean BRepMesh_CurveTessellator::Value (
   thePoint     = myDiscretTool.Value     (theIndex);
   theParameter = myDiscretTool.Parameter (theIndex);
 
-  /*if (!isInToleranceOfVertex(thePoint, myFirstVertex) &&
+  if (!isInToleranceOfVertex(thePoint, myFirstVertex) &&
       !isInToleranceOfVertex(thePoint, myLastVertex))
-  {*/
+  {
     if (!myCurve.IsCurveOnSurface())
     {
       return Standard_True;
@@ -264,9 +290,9 @@ Standard_Boolean BRepMesh_CurveTessellator::Value (
     aSurface->D0(aUV.X(), aUV.Y(), aPntOnSurf);
 
     return (thePoint.SquareDistance(aPntOnSurf) < myEdgeSqTol);
-  /*}
+  }
 
-  return Standard_False;*/
+  return Standard_False;
 }
 
 //=======================================================================

src/BRepMesh/BRepMesh_CurveTessellator.hxx

@@ -34,14 +34,18 @@ public:
   //! Constructor.
   Standard_EXPORT BRepMesh_CurveTessellator(
     const IMeshData::IEdgeHandle& theEdge,
-    const IMeshTools_Parameters&  theParameters);
+    const IMeshTools_Parameters&  theParameters,
+    const Standard_Integer        theMinPointsNb = 2,
+    const Standard_Boolean        isUseVertexTolerance = Standard_False);
 
   //! Constructor.
   Standard_EXPORT BRepMesh_CurveTessellator (
     const IMeshData::IEdgeHandle& theEdge,
     const TopAbs_Orientation      theOrientation,
     const IMeshData::IFaceHandle& theFace,
-    const IMeshTools_Parameters&  theParameters);
+    const IMeshTools_Parameters&  theParameters,
+    const Standard_Integer        theMinPointsNb = 2,
+    const Standard_Boolean        isUseVertexTolerance = Standard_False);
 
   //! Destructor.
   Standard_EXPORT virtual ~BRepMesh_CurveTessellator ();
@@ -94,8 +98,10 @@ private:
 
   const IMeshData::IEdgeHandle& myDEdge;
   const IMeshTools_Parameters&  myParameters;
+  Standard_Boolean              myUseVertexTolerance;
   TopoDS_Edge                   myEdge;
   BRepAdaptor_Curve             myCurve;
+  Standard_Integer              myMinPointsNb;
   GCPnts_TangentialDeflection   myDiscretTool;
   TopoDS_Vertex                 myFirstVertex;
   TopoDS_Vertex                 myLastVertex;

src/BRepMesh/BRepMesh_EdgeDiscret.cxx

@@ -49,9 +49,10 @@ BRepMesh_EdgeDiscret::~BRepMesh_EdgeDiscret ()
 //=======================================================================
 Handle(IMeshTools_CurveTessellator) BRepMesh_EdgeDiscret::CreateEdgeTessellator(
   const IMeshData::IEdgeHandle& theDEdge,
-  const IMeshTools_Parameters&  theParameters)
+  const IMeshTools_Parameters&  theParameters,
+  const Standard_Integer        theMinPointsNb)
 {
-  return new BRepMesh_CurveTessellator(theDEdge, theParameters);
+  return new BRepMesh_CurveTessellator(theDEdge, theParameters, theMinPointsNb);
 }
 
 //=======================================================================
@@ -62,11 +63,13 @@ Handle(IMeshTools_CurveTessellator) BRepMesh_EdgeDiscret::CreateEdgeTessellator(
   const IMeshData::IEdgeHandle& theDEdge,
   const TopAbs_Orientation      theOrientation,
   const IMeshData::IFaceHandle& theDFace,
-  const IMeshTools_Parameters&  theParameters)
+  const IMeshTools_Parameters&  theParameters,
+  const Standard_Integer        theMinPointsNb,
+  const Standard_Boolean        isUseVertexTolerance)
 {
   return theDEdge->GetSameParam() ? 
-    new BRepMesh_CurveTessellator(theDEdge, theParameters) :
-    new BRepMesh_CurveTessellator(theDEdge, theOrientation, theDFace, theParameters);
+    new BRepMesh_CurveTessellator(theDEdge, theParameters, theMinPointsNb, isUseVertexTolerance) :
+    new BRepMesh_CurveTessellator(theDEdge, theOrientation, theDFace, theParameters, theMinPointsNb, isUseVertexTolerance);
 }
 
 //=======================================================================

src/BRepMesh/BRepMesh_EdgeDiscret.hxx

@@ -38,14 +38,17 @@ public:
   //! Creates instance of free edge tessellator.
   Standard_EXPORT static Handle(IMeshTools_CurveTessellator) CreateEdgeTessellator(
     const IMeshData::IEdgeHandle& theDEdge,
-    const IMeshTools_Parameters&  theParameters);
+    const IMeshTools_Parameters&  theParameters,
+    const Standard_Integer        theMinPointsNb = 2);
 
   //! Creates instance of edge tessellator.
   Standard_EXPORT static Handle(IMeshTools_CurveTessellator) CreateEdgeTessellator(
     const IMeshData::IEdgeHandle& theDEdge,
     const TopAbs_Orientation      theOrientation,
     const IMeshData::IFaceHandle& theDFace,
-    const IMeshTools_Parameters&  theParameters);
+    const IMeshTools_Parameters&  theParameters,
+    const Standard_Integer        theMinPointsNb = 2,
+    const Standard_Boolean        isUseVertexTolerance = Standard_False);
 
   //! Creates instance of tessellation extractor.
   Standard_EXPORT static Handle(IMeshTools_CurveTessellator) CreateEdgeTessellationExtractor(

src/BRepMesh/BRepMesh_ExtrusionRangeSplitter.cxx

@@ -0,0 +1,45 @@
+// Created on: 2022-09-07
+// Copyright (c) 2022 OPEN CASCADE SAS
+// Created by: Oleg AGASHIN
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#include <BRepMesh_ExtrusionRangeSplitter.hxx>
+
+//=======================================================================
+// Function: getUndefinedIntervalNb
+// Purpose : 
+//=======================================================================
+Standard_Integer BRepMesh_ExtrusionRangeSplitter::getUndefinedIntervalNb(
+  const Handle(Adaptor3d_Surface)& theSurface,
+  const Standard_Boolean           /*isU*/,
+  const GeomAbs_Shape              theContinuity) const
+{
+  // Here we need just a regular grid along dimension with no 
+  // geometrical data regarding intervals like extrusion surface.
+  const Handle(Adaptor3d_Curve) aCurve = theSurface->BasisCurve();
+  Standard_Integer aIntervalsNb = aCurve->NbIntervals(theContinuity);
+  if (aIntervalsNb == 1)
+  {
+    const GeomAbs_CurveType aCurveType = aCurve->GetType();
+    const Standard_Boolean isBSplineCurve =
+      aCurveType == GeomAbs_BezierCurve ||
+      aCurveType == GeomAbs_BSplineCurve;
+
+    if (isBSplineCurve)
+    {
+      aIntervalsNb = aCurve->NbPoles() - 1;
+    }
+  }
+
+  return aIntervalsNb;
+}

src/BRepMesh/BRepMesh_ExtrusionRangeSplitter.hxx

@@ -0,0 +1,45 @@
+// Created on: 2022-09-07
+// Copyright (c) 2022 OPEN CASCADE SAS
+// Created by: Oleg AGASHIN
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#ifndef _BRepMesh_ExtrusionRangeSplitter_HeaderFile
+#define _BRepMesh_ExtrusionRangeSplitter_HeaderFile
+
+#include <BRepMesh_NURBSRangeSplitter.hxx>
+
+//! Auxiliary class analysing extrusion surface in order to generate internal nodes.
+class BRepMesh_ExtrusionRangeSplitter : public BRepMesh_NURBSRangeSplitter
+{
+public:
+
+  //! Constructor.
+  BRepMesh_ExtrusionRangeSplitter()
+  {
+  }
+
+  //! Destructor.
+  virtual ~BRepMesh_ExtrusionRangeSplitter()
+  {
+  }
+
+protected:
+
+  //! Returns number of intervals computed using available geometrical parameters.
+  Standard_EXPORT virtual Standard_Integer getUndefinedIntervalNb(
+    const Handle(Adaptor3d_Surface)& theSurface,
+    const Standard_Boolean           isU,
+    const GeomAbs_Shape              theContinuity) const Standard_OVERRIDE;
+};
+
+#endif

src/BRepMesh/BRepMesh_FaceChecker.cxx

@@ -267,7 +267,7 @@ void BRepMesh_FaceChecker::perform(const Standard_Integer theWireIndex) const
   Handle(IMeshData::MapOfIEdgePtr)& aIntersections = myWiresIntersectingEdges->ChangeValue(theWireIndex);
 
   // TODO: Tolerance is set to twice value of face deflection in order to fit regressions.
-  BndBox2dTreeSelector aSelector(2 * myDFace->GetDeflection());
+  BndBox2dTreeSelector aSelector(2 * Precision::PConfusion()/*myDFace->GetDeflection()*/);
   for (Standard_Integer aWireIt = theWireIndex; aWireIt < myDFace->WiresNb(); ++aWireIt)
   {
     const Handle(IMeshData::BndBox2dTree)& aBndBoxTree2 = myWiresBndBoxTree->Value(aWireIt);

src/BRepMesh/BRepMesh_MeshAlgoFactory.cxx

@@ -21,6 +21,8 @@
 #include <BRepMesh_DelaunayBaseMeshAlgo.hxx>
 #include <BRepMesh_DelaunayDeflectionControlMeshAlgo.hxx>
 #include <BRepMesh_BoundaryParamsRangeSplitter.hxx>
+#include <BRepMesh_ExtrusionRangeSplitter.hxx>
+#include <BRepMesh_UndefinedRangeSplitter.hxx>
 
 IMPLEMENT_STANDARD_RTTIEXT(BRepMesh_MeshAlgoFactory, IMeshTools_MeshAlgoFactory)
 
@@ -71,34 +73,55 @@ Handle(IMeshTools_MeshAlgo) BRepMesh_MeshAlgoFactory::GetAlgo(
   switch (theSurfaceType)
   {
   case GeomAbs_Plane:
-    return theParameters.InternalVerticesMode ?
-      new NodeInsertionMeshAlgo<BRepMesh_DefaultRangeSplitter>::Type :
-      new BaseMeshAlgo::Type;
+    return theParameters.EnableControlSurfaceDeflectionAllSurfaces ?
+      new DeflectionControlMeshAlgo<BRepMesh_DefaultRangeSplitter>::Type :
+        (theParameters.InternalVerticesMode ?
+         new NodeInsertionMeshAlgo<BRepMesh_DefaultRangeSplitter>::Type :
+         new BaseMeshAlgo::Type);
     break;
 
   case GeomAbs_Sphere:
-    return new NodeInsertionMeshAlgo<BRepMesh_SphereRangeSplitter>::Type;
+    return theParameters.EnableControlSurfaceDeflectionAllSurfaces ?
+      new DeflectionControlMeshAlgo<BRepMesh_SphereRangeSplitter>::Type :
+      new NodeInsertionMeshAlgo<BRepMesh_SphereRangeSplitter>::Type;
     break;
 
   case GeomAbs_Cylinder:
-    return theParameters.InternalVerticesMode ?
-      new NodeInsertionMeshAlgo<BRepMesh_CylinderRangeSplitter>::Type :
-      new BaseMeshAlgo::Type;
+    return theParameters.EnableControlSurfaceDeflectionAllSurfaces ?
+      new DeflectionControlMeshAlgo<BRepMesh_CylinderRangeSplitter>::Type :
+        (theParameters.InternalVerticesMode ?
+        new NodeInsertionMeshAlgo<BRepMesh_CylinderRangeSplitter>::Type :
+        new BaseMeshAlgo::Type);
     break;
 
   case GeomAbs_Cone:
-    return new NodeInsertionMeshAlgo<BRepMesh_ConeRangeSplitter>::Type;
+    return theParameters.EnableControlSurfaceDeflectionAllSurfaces ? 
+      new DeflectionControlMeshAlgo<BRepMesh_ConeRangeSplitter>::Type :
+      new NodeInsertionMeshAlgo<BRepMesh_ConeRangeSplitter>::Type;
     break;
 
   case GeomAbs_Torus:
-    return new NodeInsertionMeshAlgo<BRepMesh_TorusRangeSplitter>::Type;
+    return theParameters.EnableControlSurfaceDeflectionAllSurfaces ?
+      new DeflectionControlMeshAlgo<BRepMesh_TorusRangeSplitter>::Type :
+      new NodeInsertionMeshAlgo<BRepMesh_TorusRangeSplitter>::Type;
     break;
 
   case GeomAbs_SurfaceOfRevolution:
     return new DeflectionControlMeshAlgo<BRepMesh_BoundaryParamsRangeSplitter>::Type;
     break;
 
-  default:
+  case GeomAbs_SurfaceOfExtrusion:
+    return new DeflectionControlMeshAlgo<BRepMesh_ExtrusionRangeSplitter>::Type;
+    break;
+
+  case GeomAbs_BezierSurface:
+  case GeomAbs_BSplineSurface:
     return new DeflectionControlMeshAlgo<BRepMesh_NURBSRangeSplitter>::Type;
+    break;
+
+  case GeomAbs_OffsetSurface:
+  case GeomAbs_OtherSurface:
+  default:
+    return new DeflectionControlMeshAlgo<BRepMesh_UndefinedRangeSplitter>::Type;
   }
 }

src/BRepMesh/BRepMesh_ModelHealer.cxx

@@ -41,23 +41,49 @@ namespace
   {
   public:
     //! Constructor.
-    EdgeAmplifier(const IMeshTools_Parameters& theParameters)
-      : myParameters(theParameters)
+    EdgeAmplifier(const IMeshTools_Parameters& theParameters,
+                  const Standard_Boolean       isUseVertexTolerance = Standard_False)
+      : myParameters        (theParameters),
+        myUseVertexTolerance(isUseVertexTolerance)
     {
     }
 
+    //! Take vertex tolerance into account.
+    void SetUseVertexTolerance(const Standard_Boolean isUseVertexTolerance)
+    {
+      myUseVertexTolerance = isUseVertexTolerance;
+    }
+
     //! Main operator.
     void operator()(const IMeshData::IEdgePtr& theDEdge) const
     {
       const IMeshData::IEdgeHandle aDEdge = theDEdge;
+
+      Standard_Integer aPointsNb = aDEdge->GetCurve()->ParametersNb();
+
       aDEdge->Clear(Standard_True);
       aDEdge->SetDeflection(Max(aDEdge->GetDeflection() / 3., Precision::Confusion()));
 
+      for (Standard_Integer aPCurveIt = 0; aPCurveIt < aDEdge->PCurvesNb(); ++aPCurveIt)
+      {
+        const IMeshData::IPCurveHandle& aPCurve = aDEdge->GetPCurve(aPCurveIt);
+        const IMeshData::IFaceHandle    aDFace  = aPCurve->GetFace();
+
+        // Check that outer wire contains 2 edges or less and add an additional point.
+        const IMeshData::IWireHandle&   aDWire  = aDFace->GetWire(0);
+        if (aDWire->EdgesNb() <= 2)
+        {
+          ++aPointsNb;
+          break;
+        }
+      }
+
       const IMeshData::IPCurveHandle& aPCurve = aDEdge->GetPCurve(0);
       const IMeshData::IFaceHandle    aDFace = aPCurve->GetFace();
       Handle(IMeshTools_CurveTessellator) aTessellator =
         BRepMesh_EdgeDiscret::CreateEdgeTessellator(
-          aDEdge, aPCurve->GetOrientation(), aDFace, myParameters);
+          aDEdge, aPCurve->GetOrientation(), aDFace,
+          myParameters, aPointsNb, myUseVertexTolerance);
 
       BRepMesh_EdgeDiscret::Tessellate3d(aDEdge, aTessellator, Standard_False);
       BRepMesh_EdgeDiscret::Tessellate2d(aDEdge, Standard_False);
@@ -71,6 +97,7 @@ namespace
 
   private:
     const IMeshTools_Parameters& myParameters;
+    Standard_Boolean             myUseVertexTolerance;
   };
 
   //! Returns True if some of two vertcies is same with reference one.
@@ -172,12 +199,14 @@ void BRepMesh_ModelHealer::amplifyEdges()
     new NCollection_IncAllocator(IMeshData::MEMORY_BLOCK_SIZE_HUGE);
 
   Standard_Integer aAmpIt = 0;
-  const Standard_Real aIterNb = 5;
+  const Standard_Integer aIterNb = 6;
   IMeshData::MapOfIEdgePtr aEdgesToUpdate(1, aTmpAlloc);
   EdgeAmplifier anEdgeAmplifier (myParameters);
 
   while (aAmpIt++ < aIterNb && popEdgesToUpdate(aEdgesToUpdate))
   {
+    anEdgeAmplifier.SetUseVertexTolerance (aAmpIt == aIterNb);
+
     // Try to update discretization by decreasing deflection of problematic edges.
     OSD_Parallel::ForEach(aEdgesToUpdate.cbegin(), aEdgesToUpdate.cend(),
                           anEdgeAmplifier,

src/BRepMesh/BRepMesh_NURBSRangeSplitter.cxx

@@ -392,27 +392,73 @@ Handle(IMeshData::ListOfPnt2d) BRepMesh_NURBSRangeSplitter::GenerateSurfaceNodes
   return aNodes;
 }
 
+//=======================================================================
+// Function: getUndefinedIntervalNb
+// Purpose : 
+//=======================================================================
+Standard_Integer BRepMesh_NURBSRangeSplitter::getUndefinedIntervalNb(
+  const Handle(Adaptor3d_Surface)& theSurface,
+  const Standard_Boolean           isU,
+  const GeomAbs_Shape              /*theContinuity*/) const
+{
+  return (isU ? theSurface->NbUPoles() : theSurface->NbVPoles()) - 1;
+}
+
+//=======================================================================
+// Function: getUndefinedInterval
+// Purpose : 
+//=======================================================================
+void BRepMesh_NURBSRangeSplitter::getUndefinedInterval(
+  const Handle(Adaptor3d_Surface)&               theSurface,
+  const Standard_Boolean                         isU,
+  const GeomAbs_Shape                            theContinuity,
+  const std::pair<Standard_Real, Standard_Real>& theRange,
+  TColStd_Array1OfReal&                          theIntervals) const
+{
+  Standard_Integer aIntervalsNb = isU ? 
+    theSurface->NbUIntervals(theContinuity) :
+    theSurface->NbVIntervals(theContinuity);
+
+  if (aIntervalsNb == 1)
+  {
+    aIntervalsNb = getUndefinedIntervalNb(theSurface, isU, theContinuity);
+    if (aIntervalsNb > 1)
+    {
+      theIntervals = TColStd_Array1OfReal(1, aIntervalsNb - 1);
+      const Standard_Real aDiff = (theRange.second - theRange.first) / aIntervalsNb;
+      for (Standard_Integer i = theIntervals.Lower(); i <= theIntervals.Upper(); ++i)
+      {
+        theIntervals.SetValue(i, theRange.first + i * aDiff);
+      }
+    }
+  }
+
+  if (theIntervals.IsEmpty())
+  {
+    theIntervals = TColStd_Array1OfReal(1, aIntervalsNb + 1);
+    if (isU)
+    {
+      theSurface->UIntervals(theIntervals, theContinuity);
+    }
+    else
+    {
+      theSurface->VIntervals(theIntervals, theContinuity);
+    }
+  }
+}
+
 //=======================================================================
 // Function: initParameters
 // Purpose : 
 //=======================================================================
 Standard_Boolean BRepMesh_NURBSRangeSplitter::initParameters() const
 {
+  const GeomAbs_Shape aContinuity = GeomAbs_CN;
   const Handle(BRepAdaptor_Surface)& aSurface = GetSurface();
 
-  const GeomAbs_Shape aContinuity = GeomAbs_CN;
-  const std::pair<Standard_Integer, Standard_Integer> aIntervalsNb(
-    aSurface->NbUIntervals(aContinuity),
-    aSurface->NbVIntervals(aContinuity)
-  );
-
-  TColStd_Array1OfReal aIntervals[2] = {
-    TColStd_Array1OfReal(1, aIntervalsNb.first  + 1),
-    TColStd_Array1OfReal(1, aIntervalsNb.second + 1)
-  };
-
-  aSurface->UIntervals(aIntervals[0], aContinuity);
-  aSurface->VIntervals(aIntervals[1], aContinuity);
+  TColStd_Array1OfReal aIntervals[2];
+  getUndefinedInterval(aSurface, Standard_True,  aContinuity, GetRangeU(), aIntervals[0]);
+  getUndefinedInterval(aSurface, Standard_False, aContinuity, GetRangeV(), aIntervals[1]);
 
   const Standard_Boolean isSplitIntervals = toSplitIntervals (aSurface->Surface().Surface(), aIntervals);
 
@@ -507,12 +553,17 @@ Handle(IMeshData::SequenceOfReal) BRepMesh_NURBSRangeSplitter::computeGrainAndFi
     aMinDiff /= theDelta;
   }
 
-  aMinDiff = Max(theParameters.MinSize, aMinDiff);
+  const Handle(BRepAdaptor_Surface)& aSurface = GetSurface();
+  const Standard_Real aMinSize2d = Max(
+    aSurface->UResolution(theParameters.MinSize),
+    aSurface->VResolution(theParameters.MinSize));
+
+  aMinDiff = Max(aMinSize2d, aMinDiff);
 
   const Standard_Real aDiffMaxLim = 0.1 * theRangeDiff;
   const Standard_Real aDiffMinLim = Max(0.005 * theRangeDiff,
                                         2. * theTol2d);
-  const Standard_Real aDiff = Max(theParameters.MinSize,
+  const Standard_Real aDiff = Max(aMinSize2d,
                                   Min(aDiffMaxLim, aDiffMinLim));
   return filterParameters(theSourceParams, aMinDiff, aDiff, theAllocator);
 }

src/BRepMesh/BRepMesh_NURBSRangeSplitter.hxx

@@ -49,7 +49,21 @@ protected:
   //! Initializes U and V parameters lists using CN continuity intervals.
   Standard_EXPORT virtual Standard_Boolean initParameters() const;
 
+  //! Returns number of intervals computed using available geometrical parameters.
+  Standard_EXPORT virtual Standard_Integer getUndefinedIntervalNb(
+    const Handle(Adaptor3d_Surface)& theSurface,
+    const Standard_Boolean           isU,
+    const GeomAbs_Shape              theContinuity) const;
+
 private:
+  //! Tries to compute intervals even for cases with no intervals 
+  //! at all using available geometrical parameters.
+  void getUndefinedInterval(
+    const Handle(Adaptor3d_Surface)&               theSurface,
+    const Standard_Boolean                         isU,
+    const GeomAbs_Shape                            theContinuity,
+    const std::pair<Standard_Real, Standard_Real>& theRange,
+    TColStd_Array1OfReal&                          theIntervals) const;
 
   //! Computes parameters of filter and applies it to the source parameters.
   Handle(IMeshData::SequenceOfReal) computeGrainAndFilterParameters(

src/BRepMesh/BRepMesh_UndefinedRangeSplitter.cxx

@@ -0,0 +1,28 @@
+// Created on: 2022-09-07
+// Copyright (c) 2022 OPEN CASCADE SAS
+// Created by: Oleg AGASHIN
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#include <BRepMesh_UndefinedRangeSplitter.hxx>
+
+//=======================================================================
+// Function: getUndefinedIntervalNb
+// Purpose : 
+//=======================================================================
+Standard_Integer BRepMesh_UndefinedRangeSplitter::getUndefinedIntervalNb(
+  const Handle(Adaptor3d_Surface)& /*theSurface*/,
+  const Standard_Boolean           /*isU*/,
+  const GeomAbs_Shape              /*theContinuity*/) const
+{
+  return 1;
+}

src/BRepMesh/BRepMesh_UndefinedRangeSplitter.hxx

@@ -0,0 +1,46 @@
+// Created on: 2022-09-07
+// Copyright (c) 2022 OPEN CASCADE SAS
+// Created by: Oleg AGASHIN
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#ifndef _BRepMesh_UndefinedRangeSplitter_HeaderFile
+#define _BRepMesh_UndefinedRangeSplitter_HeaderFile
+
+#include <BRepMesh_NURBSRangeSplitter.hxx>
+
+//! Auxiliary class provides safe value for surfaces that looks like NURBS 
+//! but has no poles or other characteristics.
+class BRepMesh_UndefinedRangeSplitter : public BRepMesh_NURBSRangeSplitter
+{
+public:
+
+  //! Constructor.
+  BRepMesh_UndefinedRangeSplitter()
+  {
+  }
+
+  //! Destructor.
+  virtual ~BRepMesh_UndefinedRangeSplitter()
+  {
+  }
+
+protected:
+
+  //! Returns number of intervals computed using available geometrical parameters.
+  Standard_EXPORT virtual Standard_Integer getUndefinedIntervalNb(
+    const Handle(Adaptor3d_Surface)& theSurface,
+    const Standard_Boolean           isU,
+    const GeomAbs_Shape              theContinuity) const Standard_OVERRIDE;
+};
+
+#endif

src/BRepMesh/FILES

@@ -40,6 +40,8 @@ BRepMesh_EdgeDiscret.hxx
 BRepMesh_EdgeParameterProvider.hxx
 BRepMesh_EdgeTessellationExtractor.cxx
 BRepMesh_EdgeTessellationExtractor.hxx
+BRepMesh_ExtrusionRangeSplitter.cxx
+BRepMesh_ExtrusionRangeSplitter.hxx
 BRepMesh_FaceChecker.cxx
 BRepMesh_FaceChecker.hxx
 BRepMesh_FaceDiscret.cxx
@@ -80,6 +82,8 @@ BRepMesh_SphereRangeSplitter.hxx
 BRepMesh_TorusRangeSplitter.cxx
 BRepMesh_TorusRangeSplitter.hxx
 BRepMesh_Triangle.hxx
+BRepMesh_UndefinedRangeSplitter.cxx
+BRepMesh_UndefinedRangeSplitter.hxx
 BRepMesh_UVParamRangeSplitter.hxx
 BRepMesh_Vertex.hxx
 BRepMesh_VertexInspector.hxx

src/BRepOffset/BRepOffset_MakeOffset.cxx

@@ -336,8 +336,10 @@ static BRepOffset_Error checkSinglePoint(const Standard_Real theUParam,
                                          const NCollection_Vector<gp_Pnt>& theBadPoints);
 
 //---------------------------------------------------------------------
-static void UpdateTolerance (      TopoDS_Shape&               myShape,
-                             const TopTools_IndexedMapOfShape& myFaces);
+static void UpdateTolerance (      TopoDS_Shape&               theShape,
+                             const TopTools_IndexedMapOfShape& theFaces,
+                             const TopoDS_Shape& theInitShape);
+
 static Standard_Real ComputeMaxDist(const gp_Pln& thePlane, 
                                     const Handle(Geom_Curve)& theCrv,
                                     const Standard_Real theFirst,
@@ -1036,8 +1038,16 @@ void BRepOffset_MakeOffset::MakeOffsetShape(const Message_ProgressRange& theRang
   // MAJ Tolerance edge and Vertex
   // ----------------------------
   if (!myOffsetShape.IsNull()) {
-    UpdateTolerance (myOffsetShape,myFaces);
-    BRepLib::UpdateTolerances( myOffsetShape );
+    if (myThickening)
+    {
+      UpdateTolerance(myOffsetShape, myFaces, myShape);
+    }
+    else
+    {
+      TopoDS_Shape aDummy;
+      UpdateTolerance(myOffsetShape, myFaces, aDummy);
+    }
+    BRepLib::UpdateTolerances(myOffsetShape);
   }
 
   CorrectConicalFaces();
@@ -3165,13 +3175,38 @@ void BRepOffset_MakeOffset::MakeMissingWalls (const Message_ProgressRange& theRa
       } //if both edges are arcs of circles
       if (NewFace.IsNull())
       {
-        BRepLib_MakeFace MF(theWire, Standard_True); //Only plane
-        if (MF.Error() == BRepLib_FaceDone)
+        Standard_Real anEdgeTol = BRep_Tool::Tolerance(anEdge);
+        //Tolerances of input shape should not be increased by BRepLib_MakeFace
+        BRepLib_FindSurface aFindPlane(theWire, anEdgeTol, Standard_True); //only plane
+        IsPlanar = Standard_False;
+        if(aFindPlane.Found() && aFindPlane.ToleranceReached() <= anEdgeTol)
         {
-          NewFace = MF.Face();
-          IsPlanar = Standard_True;
+          Standard_Real f, l;
+          Handle(Geom_Curve) aGC = BRep_Tool::Curve(anEdge, f, l);
+          Handle(Geom_Plane) aPln = Handle(Geom_Plane)::DownCast(aFindPlane.Surface());
+          Standard_Real aMaxDist = ComputeMaxDist(aPln->Pln(), aGC, f, l);
+          if (aMaxDist <= anEdgeTol)
+          {
+            BRepLib_MakeFace MF(aPln->Pln(), theWire);
+            if (MF.IsDone())
+            {
+              NewFace = MF.Face();
+              TopoDS_Iterator anItE(theWire);
+              for (; anItE.More(); anItE.Next())
+              {
+                const TopoDS_Edge& anE = TopoDS::Edge(anItE.Value());
+                if (anE.IsSame(anEdge))
+                  continue;
+                aGC = BRep_Tool::Curve(anE, f, l);
+                aMaxDist = ComputeMaxDist(aPln->Pln(), aGC, f, l);
+                BB.UpdateEdge(anE, aMaxDist);
+              }
+              IsPlanar = Standard_True;
+            }
+          }
         }
-        else //Extrusion (by thrusections)
+        //
+        if(!IsPlanar) //Extrusion (by thrusections)
         {
           Handle(Geom_Curve) EdgeCurve = BRep_Tool::Curve(anEdge, fpar, lpar);
           Handle(Geom_TrimmedCurve) TrEdgeCurve =
@@ -3185,7 +3220,6 @@ void BRepOffset_MakeOffset::MakeMissingWalls (const Message_ProgressRange& theRa
           ThrusecGenerator.AddCurve( TrOffsetCurve );
           ThrusecGenerator.Perform( Precision::PConfusion() );
           theSurf = ThrusecGenerator.Surface();
-          //theSurf = new Geom_SurfaceOfLinearExtrusion( TrOffsetCurve, OffsetDir );
           Standard_Real Uf, Ul, Vf, Vl;
           theSurf->Bounds(Uf, Ul, Vf, Vl);
           TopLoc_Location Loc;
@@ -3272,8 +3306,14 @@ void BRepOffset_MakeOffset::MakeMissingWalls (const Message_ProgressRange& theRa
           BB.Range( anE3, FirstPar, LastPar );
         }
       }
-      BRepLib::SameParameter(NewFace);
-      BRepTools::Update(NewFace);
+
+      if (!IsPlanar)
+      {
+        // For planar faces these operations are useless,
+        // because there are no curves on surface
+        BRepLib::SameParameter(NewFace);
+        BRepTools::Update(NewFace);
+      }
       //Check orientation
       TopAbs_Orientation anOr = OrientationOfEdgeInFace(anEdge, aFaceOfEdge);
       TopAbs_Orientation OrInNewFace = OrientationOfEdgeInFace(anEdge, NewFace);
@@ -3781,6 +3821,7 @@ void BRepOffset_MakeOffset::EncodeRegularity ()
 #endif
 }
 
+
 //=======================================================================
 //function : ComputeMaxDist
 //purpose  : 
@@ -3807,13 +3848,15 @@ Standard_Real ComputeMaxDist(const gp_Pln& thePlane,
   }
   return sqrt(aMaxDist)*1.05;
 }
+
 //=======================================================================
-//function : UpDateTolerance
+//function : UpdateTolerance
 //purpose  : 
 //=======================================================================
 
 void UpdateTolerance (TopoDS_Shape& S,
-                      const TopTools_IndexedMapOfShape& Faces)
+                      const TopTools_IndexedMapOfShape& Faces,
+                      const TopoDS_Shape& theInitShape)
 {
   BRep_Builder B;
   TopTools_MapOfShape View;
@@ -3829,12 +3872,31 @@ void UpdateTolerance (TopoDS_Shape& S,
     }
   }
   
-  Standard_Real Tol;
-  TopExp_Explorer ExpF;
-  for (ExpF.Init(S, TopAbs_FACE); ExpF.More(); ExpF.Next())
+  // The edges of initial shape are  not modified
+  TopTools_MapOfShape aMapInitF;
+  if (!theInitShape.IsNull())
   {
-    const TopoDS_Shape& F = ExpF.Current();
-    if (Faces.Contains(F))
+    TopExp_Explorer anExpF(theInitShape, TopAbs_FACE);
+    for (; anExpF.More(); anExpF.Next()) {
+      aMapInitF.Add(anExpF.Current());
+      TopExp_Explorer anExpE;
+      for (anExpE.Init(anExpF.Current(), TopAbs_EDGE); anExpE.More(); anExpE.Next()) {
+        View.Add(anExpE.Current());
+        TopoDS_Iterator anItV(anExpE.Current());
+        for (; anItV.More(); anItV.Next())
+        {
+          View.Add(anItV.Value());
+        }
+      }
+    }
+  }
+  
+  Standard_Real Tol;
+  TopExp_Explorer anExpF(S, TopAbs_FACE);
+  for (; anExpF.More(); anExpF.Next())
+  {
+    const TopoDS_Shape& F = anExpF.Current();
+    if (Faces.Contains(F) || aMapInitF.Contains(F))
     {
       continue;
     }
@@ -3843,6 +3905,7 @@ void UpdateTolerance (TopoDS_Shape& S,
     for (Exp.Init(F, TopAbs_EDGE); Exp.More(); Exp.Next()) {
       TopoDS_Edge E = TopoDS::Edge(Exp.Current());
       Standard_Boolean isUpdated = Standard_False;
+      Standard_Real aCurrTol = BRep_Tool::Tolerance(E);
       if (aBAS.GetType() == GeomAbs_Plane)
       {
         //Edge does not seem to have pcurve on plane,
@@ -3850,17 +3913,22 @@ void UpdateTolerance (TopoDS_Shape& S,
         Standard_Real aFirst, aLast;
         Handle(Geom_Curve) aCrv = BRep_Tool::Curve(E, aFirst, aLast);
         Standard_Real aMaxDist = ComputeMaxDist(aBAS.Plane(), aCrv, aFirst, aLast);
-        E.Locked (Standard_False);
-        B.UpdateEdge(E, aMaxDist);
-        isUpdated = Standard_True;
+        if (aMaxDist > aCurrTol)
+        {
+          B.UpdateEdge(E, aMaxDist);
+          isUpdated = Standard_True;
+        }
       }
       if (View.Add(E))
       {
-
+        E.Locked(Standard_False);       
         BRepCheck_Edge EdgeCorrector(E);
         Tol = EdgeCorrector.Tolerance();
-        B.UpdateEdge(E, Tol);
-        isUpdated = Standard_True;
+        if (Tol > aCurrTol)
+        {
+          B.UpdateEdge(E, Tol);
+          isUpdated = Standard_True;
+        }
       }
       if (isUpdated)
       {
@@ -3869,11 +3937,11 @@ void UpdateTolerance (TopoDS_Shape& S,
         TopExp::Vertices(E, V[0], V[1]);
 
         for (Standard_Integer i = 0; i <= 1; i++) {
+          V[i].Locked(Standard_False);
           if (View.Add(V[i])) {
             Handle(BRep_TVertex) TV = Handle(BRep_TVertex)::DownCast(V[i].TShape());
             TV->Tolerance(0.);
             BRepCheck_Vertex VertexCorrector(V[i]);
-            V[i].Locked (Standard_False);
             B.UpdateVertex(V[i], VertexCorrector.Tolerance());
             // use the occasion to clean the vertices.
             (TV->ChangePoints()).Clear();
@@ -4953,6 +5021,53 @@ Standard_Boolean BRepOffset_MakeOffset::IsPlanar()
       if (aPlanarityChecker.IsPlanar())
       {
         gp_Pln aPln = aPlanarityChecker.Plan();
+        Standard_Real u1, u2, v1, v2, um, vm;
+        aSurf->Bounds(u1, u2, v1, v2);
+        Standard_Boolean isInf1 = Precision::IsInfinite(u1), isInf2 = Precision::IsInfinite(u2);
+        if (!isInf1 && !isInf2)
+        {
+          um = (u1 + u2) / 2.;
+        }
+        else if(isInf1 && !isInf2)
+        {
+          um = u2 - 1.;
+        }
+        else if(!isInf1 && isInf2)
+        {
+          um = u1 + 1.;
+        }
+        else //isInf1 && isInf2
+        {
+          um = 0.;
+        }
+        isInf1 = Precision::IsInfinite(v1), isInf2 = Precision::IsInfinite(v2);
+        if (!isInf1 && !isInf2)
+        {
+          vm = (v1 + v2) / 2.;
+        }
+        else if (isInf1 && !isInf2)
+        {
+          vm = v2 - 1.;
+        }
+        else if(!isInf1 && isInf2)
+        {
+          vm = v1 + 1.;
+        }
+        else //isInf1 && isInf2
+        {
+          vm = 0.;
+        }
+        gp_Pnt aP;
+        gp_Vec aD1, aD2;
+        aBAS.D1(um, vm, aP, aD1, aD2);
+        gp_Vec aNorm = aD1.Crossed(aD2);
+        gp_Dir aPlnNorm = aPln.Position().Direction();
+        if (aNorm.Dot(aPlnNorm) < 0.)
+        {
+          aPlnNorm.Reverse();
+          gp_Ax1 anAx(aPln.Position().Location(), aPlnNorm);
+          aPln.SetAxis(anAx);
+        }
         Handle(Geom_Plane) aPlane = new Geom_Plane(aPln);
         TopoDS_Face aPlanarFace;
         aBB.MakeFace(aPlanarFace, aPlane, aTolForFace);

src/BRepOffsetAPI/BRepOffsetAPI_MakeOffset.cxx

@@ -17,9 +17,12 @@
 
 #include <BRep_Builder.hxx>
 #include <BRep_Tool.hxx>
+#include <BRepAdaptor_Curve.hxx>
 #include <BRepAdaptor_Surface.hxx>
+#include <BRepAlgo.hxx>
 #include <BRepAlgo_FaceRestrictor.hxx>
 #include <BRepBuilderAPI_MakeFace.hxx>
+#include <BRepLib.hxx>
 #include <BRepOffsetAPI_MakeOffset.hxx>
 #include <BRepTopAdaptor_FClass2d.hxx>
 #include <Extrema_ExtPS.hxx>
@@ -41,6 +44,50 @@
 static Standard_Boolean AffichSpine = Standard_False;
 #endif
 
+static Standard_Boolean NeedsConvertion (const TopoDS_Wire& theWire)
+{
+  TopoDS_Iterator anIter (theWire);
+  for (; anIter.More(); anIter.Next())
+  {
+    const TopoDS_Edge& anEdge = TopoDS::Edge (anIter.Value());
+    BRepAdaptor_Curve aBAcurve (anEdge);
+    GeomAbs_CurveType aType = aBAcurve.GetType();
+    if (aType != GeomAbs_Line &&
+        aType != GeomAbs_Circle)
+      return Standard_True;
+  }
+
+  return Standard_False;
+}
+
+TopoDS_Face BRepOffsetAPI_MakeOffset::ConvertFace (const TopoDS_Face&  theFace,
+                                                   const Standard_Real theAngleTolerance)
+{
+  TopAbs_Orientation anOr = theFace.Orientation();
+  TopoDS_Face aFace = theFace;
+  aFace.Orientation (TopAbs_FORWARD);
+
+  TopoDS_Face aNewFace = TopoDS::Face (aFace.EmptyCopied());
+  BRep_Builder aBB;
+  TopoDS_Iterator anIter (aFace);
+  for (; anIter.More(); anIter.Next())
+  {
+    TopoDS_Wire aWire = TopoDS::Wire (anIter.Value());
+    if (NeedsConvertion (aWire))
+    {
+      TopAbs_Orientation anOrOfWire = aWire.Orientation();
+      aWire.Orientation (TopAbs_FORWARD);
+      aWire = BRepAlgo::ConvertWire (aWire, theAngleTolerance, aFace);
+      BRepLib::BuildCurves3d (aWire);
+      aWire.Orientation (anOrOfWire);
+    }
+    aBB.Add (aNewFace, aWire);
+  }
+  aNewFace.Orientation (anOr);
+
+  return aNewFace;
+}
+
 //=======================================================================
 //function : BRepOffsetAPI_MakeOffset
 //purpose  : 
@@ -49,7 +96,8 @@ static Standard_Boolean AffichSpine = Standard_False;
 BRepOffsetAPI_MakeOffset::BRepOffsetAPI_MakeOffset()
   : myIsInitialized( Standard_False),
     myJoin(GeomAbs_Arc),
-    myIsOpenResult(Standard_False)
+    myIsOpenResult(Standard_False),
+    myIsToApprox(Standard_False)
 {
 }
 
@@ -80,6 +128,7 @@ void BRepOffsetAPI_MakeOffset::Init(const TopoDS_Face&     Spine,
   myIsInitialized = Standard_True;
   myJoin          = Join;
   myIsOpenResult  = IsOpenResult;
+  myIsToApprox = Standard_False;
   TopExp_Explorer exp;
   for (exp.Init(myFace,TopAbs_WIRE); exp.More();exp.Next()) {
     myWires.Append(exp.Current());
@@ -99,6 +148,7 @@ BRepOffsetAPI_MakeOffset::BRepOffsetAPI_MakeOffset(const TopoDS_Wire& Spine,
   myIsInitialized = Standard_True;
   myJoin = Join;
   myIsOpenResult  = IsOpenResult;
+  myIsToApprox = Standard_False;
 }
 
 //=======================================================================
@@ -113,6 +163,18 @@ void BRepOffsetAPI_MakeOffset::Init(const GeomAbs_JoinType Join,
   myIsOpenResult  = IsOpenResult;
 }
 
+//=======================================================================
+//function : SetApprox
+//purpose  : Set approximation flag
+//           for convertion input contours into ones consisting of
+//           2D circular arcs and 2D linear segments only
+//=======================================================================
+
+void BRepOffsetAPI_MakeOffset::SetApprox(const Standard_Boolean ToApprox)
+{
+  myIsToApprox = ToApprox;
+}
+
 //=======================================================================
 //function : BRepOffsetAPI_MakeOffset
 //purpose  : 
@@ -289,6 +351,46 @@ void BRepOffsetAPI_MakeOffset::Perform(const Standard_Real Offset,
 
   try
   {
+    if (myIsToApprox)
+    {
+      Standard_Real aTol = 0.1;
+      if (myFace.IsNull())
+      {
+        TopoDS_Face aFace;
+        Standard_Boolean OnlyPlane = Standard_True;
+        TopTools_ListIteratorOfListOfShape anItl (myWires);
+        for (; anItl.More(); anItl.Next())
+        {
+          BRepBuilderAPI_MakeFace aFaceMaker (TopoDS::Wire(anItl.Value()), OnlyPlane);
+          if (aFaceMaker.Error() == BRepBuilderAPI_FaceDone)
+          {
+            aFace = aFaceMaker.Face();
+            break;
+          }
+        }
+        for (anItl.Initialize(myWires); anItl.More(); anItl.Next())
+        {
+          const TopoDS_Wire& aWire = TopoDS::Wire(anItl.Value());
+          if (NeedsConvertion (aWire))
+          {
+            TopoDS_Wire aNewWire = BRepAlgo::ConvertWire (aWire, aTol, aFace);
+            BRepLib::BuildCurves3d (aNewWire);
+            aNewWire.Orientation (aWire.Orientation());
+            anItl.ChangeValue() = aNewWire;
+          }
+        }
+      }
+      else
+      {
+        myFace = ConvertFace (myFace, aTol);
+        BRepLib::BuildCurves3d (myFace);
+        myWires.Clear();
+        TopoDS_Iterator anIter (myFace);
+        for (; anIter.More(); anIter.Next())
+          myWires.Append (anIter.Value());
+      }
+    }
+    
     Standard_Integer i = 1;
     BRepFill_ListIteratorOfListOfOffsetWire itOW;
     TopoDS_Compound Res;

src/BRepOffsetAPI/BRepOffsetAPI_MakeOffset.hxx

@@ -63,6 +63,11 @@ public:
   //! Initialize the evaluation of Offsetting.
   Standard_EXPORT void Init (const GeomAbs_JoinType Join = GeomAbs_Arc, const Standard_Boolean IsOpenResult = Standard_False);
   
+  //! Set approximation flag
+  //! for convertion input contours into ones consisting of
+  //! 2D circular arcs and 2D linear segments only.
+  Standard_EXPORT void SetApprox (const Standard_Boolean ToApprox);
+  
   //! Initializes the algorithm to construct parallels to the wire Spine.
   Standard_EXPORT void AddWire (const TopoDS_Wire& Spine);
   
@@ -79,7 +84,10 @@ public:
   //! from the shape <S>.
   Standard_EXPORT virtual const TopTools_ListOfShape& Generated (const TopoDS_Shape& S) Standard_OVERRIDE;
 
-
+  //! Converts each wire of the face into contour consisting only of
+  //! arcs and segments. New 3D curves are built too.
+  Standard_EXPORT static TopoDS_Face ConvertFace (const TopoDS_Face& theFace,
+                                                  const Standard_Real theAngleTolerance);
 
 
 protected:
@@ -96,6 +104,7 @@ private:
   Standard_Boolean myLastIsLeft;
   GeomAbs_JoinType myJoin;
   Standard_Boolean myIsOpenResult;
+  Standard_Boolean myIsToApprox;
   TopoDS_Face myFace;
   TopTools_ListOfShape myWires;
   BRepFill_ListOfOffsetWire myLeft;

src/BRepOffsetAPI/BRepOffsetAPI_ThruSections.cxx

@@ -262,6 +262,7 @@ BRepOffsetAPI_ThruSections::BRepOffsetAPI_ThruSections(const Standard_Boolean is
   myCritWeights[1] = .2; 
   myCritWeights[2] = .4; 
   myUseSmoothing = Standard_False;
+  myStatus = BRepFill_ThruSectionErrorStatus_NotDone;
 }
 
 
@@ -286,7 +287,7 @@ void BRepOffsetAPI_ThruSections::Init(const Standard_Boolean isSolid, const Stan
   myCritWeights[1] = .2; 
   myCritWeights[2] = .4; 
   myUseSmoothing = Standard_False;
-
+  myStatus = BRepFill_ThruSectionErrorStatus_NotDone;
 }
 
 
@@ -343,6 +344,7 @@ void BRepOffsetAPI_ThruSections::CheckCompatibility(const Standard_Boolean check
 
 void BRepOffsetAPI_ThruSections::Build(const Message_ProgressRange& /*theRange*/)
 {
+  myStatus = BRepFill_ThruSectionErrorStatus_Done;
   myBFGenerator.Nullify();
   //Check set of section for right configuration of punctual sections
   Standard_Integer i;
@@ -356,7 +358,10 @@ void BRepOffsetAPI_ThruSections::Build(const Message_ProgressRange& /*theRange*/
       wdeg = wdeg && (BRep_Tool::Degenerated(anEdge));
     }
     if (wdeg)
-      throw Standard_Failure("Wrong usage of punctual sections");
+    {
+      myStatus = BRepFill_ThruSectionErrorStatus_WrongUsage;
+      return;
+    }
   }
   if (myWires.Length() <= 2)
   {
@@ -371,7 +376,8 @@ void BRepOffsetAPI_ThruSections::Build(const Message_ProgressRange& /*theRange*/
     }
     if (wdeg)
     {
-      throw Standard_Failure("Wrong usage of punctual sections");
+      myStatus = BRepFill_ThruSectionErrorStatus_WrongUsage;
+      return;
     }
   }
 
@@ -447,6 +453,13 @@ void BRepOffsetAPI_ThruSections::Build(const Message_ProgressRange& /*theRange*/
         }
       }
     }
+    else
+    {
+      myStatus = Georges.GetStatus();
+      NotDone();
+      return;
+    }
+
     myWires = WorkingSections;
   } //if (myWCheck)
   else //no check
@@ -498,6 +511,12 @@ void BRepOffsetAPI_ThruSections::Build(const Message_ProgressRange& /*theRange*/
     NotDone();
     return;
   }
+
+  if (myStatus != BRepFill_ThruSectionErrorStatus_Done)
+  {
+    NotDone();
+    return;
+  }
   // Encode the Regularities
   BRepLib::EncodeRegularity(myShape);
 }
@@ -520,6 +539,12 @@ void BRepOffsetAPI_ThruSections::CreateRuled()
     myBFGenerator->AddWire(TopoDS::Wire(myWires(i)));
   }
   myBFGenerator->Perform();
+  BRepFill_ThruSectionErrorStatus aStatus = myBFGenerator->GetStatus();
+  if (aStatus != BRepFill_ThruSectionErrorStatus_Done)
+  {
+    myStatus = aStatus;
+    return;
+  }
   TopoDS_Shell shell = myBFGenerator->Shell();
 
   if (myIsSolid) {
@@ -739,6 +764,7 @@ void BRepOffsetAPI_ThruSections::CreateSmoothed()
   TS = TotalSurf(shapes,nbSects,nbEdges,w1Point,w2Point,vClosed);
 
   if(TS.IsNull()) {
+    myStatus = BRepFill_ThruSectionErrorStatus_Failed;
     return;
   }
 
@@ -934,14 +960,12 @@ void BRepOffsetAPI_ThruSections::CreateSmoothed()
     else {
       myShape = MakeSolid(shell, newW1, newW2, myPres3d, myFirst, myLast);
     }
-
-    Done();
   }
 
   else {
     myShape = shell;
-    Done();
   }
+  Done();
 
   TopTools_DataMapOfShapeReal aVertexToleranceMap;
   TopExp_Explorer aTopExplorer(myShape,TopAbs_EDGE);
@@ -1040,7 +1064,9 @@ static Handle(Geom_BSplineCurve) EdgeToBSpline (const TopoDS_Edge& theEdge)
     Standard_Real aFirst, aLast;
     Handle(Geom_Curve) aCurve = BRep_Tool::Curve (theEdge, aLoc, aFirst, aLast);
     if (aCurve.IsNull())
-      throw Standard_NullObject("Null 3D curve in edge");
+    {
+      return nullptr;
+    }
 
     // convert its part used by edge to bspline; note that if edge curve is bspline,
     // conversion made via trimmed curve is still needed -- it will copy it, segment 
@@ -1132,6 +1158,10 @@ Handle(Geom_BSplineSurface) BRepOffsetAPI_ThruSections::
       // read the first edge to initialise CompBS;
       TopoDS_Edge aPrevEdge = TopoDS::Edge (shapes((j-1)*NbEdges+1));
       Handle(Geom_BSplineCurve) curvBS = EdgeToBSpline (aPrevEdge);
+      if (curvBS.IsNull())
+      {
+        return nullptr;
+      }
 
       // initialization
       GeomConvert_CompCurveToBSplineCurve CompBS(curvBS);
@@ -1145,6 +1175,10 @@ Handle(Geom_BSplineSurface) BRepOffsetAPI_ThruSections::
         aTolV = Max(aTolV, BRep_Tool::Tolerance(vl));
         aTolV = Min(aTolV, 1.e-3);
         curvBS = EdgeToBSpline (aNextEdge);
+        if (curvBS.IsNull())
+        {
+          return nullptr;
+        }
 
         // concatenation
         CompBS.Add(curvBS, aTolV, Standard_True, Standard_False, 1);
@@ -1503,7 +1537,11 @@ void BRepOffsetAPI_ThruSections::CriteriumWeight(Standard_Real& W1, Standard_Rea
 
 void BRepOffsetAPI_ThruSections::SetCriteriumWeight(const Standard_Real W1, const Standard_Real W2, const Standard_Real W3)
 {
-  if (W1 < 0 || W2 < 0 || W3 < 0 ) throw Standard_DomainError();
+  if (W1 < 0 || W2 < 0 || W3 < 0)
+  {
+    myStatus = BRepFill_ThruSectionErrorStatus_Failed;
+    return;
+  }
   myCritWeights[0] = W1;
   myCritWeights[1] = W2;
   myCritWeights[2] = W3;

src/BRepOffsetAPI/BRepOffsetAPI_ThruSections.hxx

@@ -21,6 +21,7 @@
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
+#include <BRepFill_ThruSectionErrorStatus.hxx>
 #include <TopTools_SequenceOfShape.hxx>
 #include <TopoDS_Face.hxx>
 #include <TopTools_DataMapOfShapeShape.hxx>
@@ -163,6 +164,11 @@ public:
   //! Returns the current mutable input state
   Standard_EXPORT Standard_Boolean IsMutableInput() const;
   
+  //! Returns the status of thrusection operation
+  BRepFill_ThruSectionErrorStatus GetStatus() const
+  {
+    return myStatus;
+  }
 
 protected:
 
@@ -206,6 +212,7 @@ private:
   Standard_Boolean myUseSmoothing;
   Standard_Boolean myMutableInput;
   NCollection_Handle<BRepFill_Generator> myBFGenerator;
+  BRepFill_ThruSectionErrorStatus myStatus;
 
 };
 

src/BRepTest/BRepTest_CurveCommands.cxx

@@ -1530,10 +1530,23 @@ Standard_Integer mkoffset(Draw_Interpretor& di,
   char name[100];
 
   BRepOffsetAPI_MakeOffset Paral;
+
+  Standard_Boolean ToApprox = Standard_False;
   GeomAbs_JoinType theJoinType = GeomAbs_Arc;
-  if (n >= 6 && strcmp(a[5], "i") == 0)
-    theJoinType = GeomAbs_Intersection;
-  Paral.Init(theJoinType);
+  
+  Standard_Integer anIndArg = 6;
+  if (n >= 6)
+  {
+    if (strcmp(a[5], "-approx") == 0)
+    {
+      ToApprox = Standard_True;
+      anIndArg++;
+    }
+  
+    if (n >= anIndArg && strcmp(a[anIndArg-1], "i") == 0)
+      theJoinType = GeomAbs_Intersection;
+  }
+  
   TopoDS_Shape Base = DBRep::Get(a[2],TopAbs_FACE);
 
   if ( Base.IsNull())
@@ -1553,6 +1566,7 @@ Standard_Integer mkoffset(Draw_Interpretor& di,
     Base.Orientation(TopAbs_FORWARD);
     Paral.Init(TopoDS::Face(Base), theJoinType);
   }
+  Paral.SetApprox (ToApprox);
 
   Standard_Real U, dU;
   Standard_Integer Nb;
@@ -1560,8 +1574,8 @@ Standard_Integer mkoffset(Draw_Interpretor& di,
   Nb = Draw::Atoi(a[3]);
 
   Standard_Real Alt = 0.;
-  if ( n == 7)
-    Alt = Draw::Atof(a[6]);
+  if (n > anIndArg)
+    Alt = Draw::Atof(a[anIndArg]);
 
   Standard_Integer Compt = 1;
 
@@ -1598,16 +1612,30 @@ Standard_Integer openoffset(Draw_Interpretor& di,
   char name[100];
 
   BRepOffsetAPI_MakeOffset Paral;
+  
+  Standard_Boolean ToApprox = Standard_False;
   GeomAbs_JoinType theJoinType = GeomAbs_Arc;
-  if (n == 6 && strcmp(a[5], "i") == 0)
-    theJoinType = GeomAbs_Intersection;
-  Paral.Init(theJoinType, Standard_True);
+  
+  Standard_Integer anIndArg = 6;
+  if (n >= 6)
+  {
+    if (strcmp(a[5], "-approx") == 0)
+    {
+      ToApprox = Standard_True;
+      anIndArg++;
+    }
+  
+    if (n >= anIndArg && strcmp(a[anIndArg-1], "i") == 0)
+      theJoinType = GeomAbs_Intersection;
+  }
+  
   TopoDS_Shape Base = DBRep::Get(a[2] ,TopAbs_FACE);
 
   if ( Base.IsNull())
   {
     Base = DBRep::Get(a[2], TopAbs_WIRE);
     if (Base.IsNull()) return 1;
+    Paral.Init(theJoinType, Standard_True);
     Paral.AddWire(TopoDS::Wire(Base));
   }
   else
@@ -1615,6 +1643,7 @@ Standard_Integer openoffset(Draw_Interpretor& di,
     Base.Orientation(TopAbs_FORWARD);
     Paral.Init(TopoDS::Face(Base), theJoinType, Standard_True);
   }
+  Paral.SetApprox (ToApprox);
 
   Standard_Real U, dU;
   Standard_Integer Nb;
@@ -1755,6 +1784,72 @@ Standard_Integer edgeintersector(Draw_Interpretor& di,
 
 }
 
+//=================================================================================
+//function : arclinconvert
+//purpose  : Convert a single face to a face with contour made of arcs and segments
+//=================================================================================
+
+static Standard_Integer arclinconvert (Draw_Interpretor& /*dout*/, Standard_Integer n, const char** a)
+{
+  // Check the command arguments
+  if (n < 3) {
+    std::cout<<"Error: "<<a[0]<<" - invalid number of arguments"<<std::endl;
+    std::cout<<"Usage: type help "<<a[0]<<std::endl;
+    return 1; //TCL_ERROR
+  }
+
+  //read shape
+  const TopoDS_Shape aShape = DBRep::Get(a[2]);
+  if (aShape.IsNull()) {
+    std::cout<<"Error: "<<a[2]<<" is null"<<std::endl;
+    return 1; //TCL_ERROR
+  }
+
+  TopAbs_ShapeEnum aType = aShape.ShapeType();
+  if (aType != TopAbs_WIRE &&
+      aType != TopAbs_FACE)
+  {
+    std::cout<<"Error: "<<a[2]<<" is neither wire no face"<<std::endl;
+    return 1; //TCL_ERROR
+  }
+
+  //read tolerance
+  Standard_Real aTol = 0.01;
+  if (n > 3)
+    aTol = Draw::Atof(a[3]);
+  std::cout<<"Info: tolerance is set to "<<aTol<<std::endl;
+
+  TopoDS_Shape aResult;
+  
+  if (aType == TopAbs_WIRE)
+  {
+    Standard_Boolean OnlyPlane = Standard_False;
+    BRepBuilderAPI_MakeFace aFaceMaker (TopoDS::Wire(aShape), OnlyPlane);
+    if (aFaceMaker.Error() != BRepBuilderAPI_FaceDone)
+    {
+      std::cout<<"Error: failed to find a face for the wire "<<a[2]<<std::endl;
+      return 1; //TCL_ERROR
+    }
+    TopoDS_Face aFace = aFaceMaker.Face();
+    TopoDS_Iterator anIter (aFace);
+    TopoDS_Wire aWire = TopoDS::Wire (anIter.Value());
+    aResult = BRepAlgo::ConvertWire (aWire, aTol, aFace);
+  }
+  else if (aType == TopAbs_FACE)
+  {
+    TopoDS_Face aFace = TopoDS::Face(aShape);
+    aResult = BRepAlgo::ConvertFace (aFace, aTol);
+  }
+
+  if (aResult.IsNull()) {
+    std::cout<<"Error: could not convert "<<a[2]<<std::endl;
+    return 1; //TCL_ERROR
+  }
+
+  DBRep::Set(a[1], aResult);
+  return 0; //TCL_OK
+}
+
 //=======================================================================
 //function : concatC0wire
 //purpose  : 
@@ -1908,11 +2003,11 @@ void  BRepTest::CurveCommands(Draw_Interpretor& theCommands)
     profile2d,g);
 
   theCommands.Add("mkoffset",
-    "mkoffset result face/compound of wires  nboffset stepoffset [jointype(a/i) [alt]]",__FILE__,
+    "mkoffset result face/compound of wires  nboffset stepoffset [-approx] [jointype(a/i) [alt]]",__FILE__,
     mkoffset,g);
 
   theCommands.Add("openoffset",
-    "openoffset result face/wire nboffset stepoffset [jointype(a/i)]",__FILE__,
+    "openoffset result face/wire nboffset stepoffset [-approx] [jointype(a/i)]",__FILE__,
     openoffset,g);
 
   theCommands.Add("mkedge",
@@ -1968,6 +2063,12 @@ void  BRepTest::CurveCommands(Draw_Interpretor& theCommands)
     "reducepcurves shape1 shape2 ...",__FILE__,
     reducepcurves, g);
 
+  theCommands.Add("arclinconvert",
+    "arclinconvert result wire/face [tol]",
+    __FILE__,
+    arclinconvert,
+    g);
+
   theCommands.Add("concatC0wire",
     "concatC0wire result wire",
     __FILE__,

src/BRepTest/BRepTest_ExtremaCommands.cxx

@@ -173,7 +173,7 @@ static int ShapeProximity (Draw_Interpretor& theDI, Standard_Integer theNbArgs,
 {
   if (theNbArgs < 3 || theNbArgs > 6)
   {
-    Message::SendFail() << "Usage: " << theArgs[0] << " Shape1 Shape2 [-tol <value>] [-profile]";
+    Message::SendFail() << "Usage: " << theArgs[0] << " Shape1 Shape2 [-tol <value> | -value] [-profile]";
     return 1;
   }
 
@@ -186,9 +186,11 @@ static int ShapeProximity (Draw_Interpretor& theDI, Standard_Integer theNbArgs,
     return 1;
   }
 
-  BRepExtrema_ShapeProximity aTool;
+  BRepExtrema_ShapeProximity aTool(0.0);
 
   Standard_Boolean aProfile = Standard_False;
+  Standard_Boolean isTolerance = Standard_False;
+  Standard_Boolean isValue = Standard_False;
 
   for (Standard_Integer anArgIdx = 3; anArgIdx < theNbArgs; ++anArgIdx)
   {
@@ -197,6 +199,7 @@ static int ShapeProximity (Draw_Interpretor& theDI, Standard_Integer theNbArgs,
 
     if (aFlag == "-tol")
     {
+      isTolerance = Standard_True;
       if (++anArgIdx >= theNbArgs)
       {
         Message::SendFail() << "Error: wrong syntax at argument '" << aFlag;
@@ -214,13 +217,23 @@ static int ShapeProximity (Draw_Interpretor& theDI, Standard_Integer theNbArgs,
         aTool.SetTolerance (aTolerance);
       }
     }
-
-    if (aFlag == "-profile")
+    else if (aFlag == "-value")
+    {
+      isValue = Standard_True;
+      aTool.SetTolerance(Precision::Infinite());
+    }
+    else if (aFlag == "-profile")
     {
       aProfile = Standard_True;
     }
   }
 
+  if (isTolerance && isValue)
+  {
+    Message::SendFail() << "Error: Proximity value could not be computed if the tolerance is set";
+    return 1;
+  }
+
   Standard_Real aInitTime = 0.0;
   Standard_Real aWorkTime = 0.0;
 
@@ -264,39 +277,74 @@ static int ShapeProximity (Draw_Interpretor& theDI, Standard_Integer theNbArgs,
     theDI << "Executing proximity test: " << aWorkTime << "\n";
   }
 
-  TopoDS_Builder aCompBuilder;
-
-  TopoDS_Compound aFaceCompound1;
-  aCompBuilder.MakeCompound (aFaceCompound1);
-
-  for (BRepExtrema_MapOfIntegerPackedMapOfInteger::Iterator anIt1 (aTool.OverlapSubShapes1()); anIt1.More(); anIt1.Next())
+  if (isValue)
   {
-    TCollection_AsciiString aStr = TCollection_AsciiString (theArgs[1]) + "_" + (anIt1.Key() + 1);
+    theDI << "Proximity value: " << aTool.Proximity() << "\n";
 
-    const TopoDS_Face& aFace = aTool.GetSubShape1 (anIt1.Key());
-    aCompBuilder.Add (aFaceCompound1, aFace);
-    DBRep::Set (aStr.ToCString(), aFace);
+    // proximity points
+    TopoDS_Vertex aProxVtx1 = BRepLib_MakeVertex (aTool.ProximityPoint1());
+    TopoDS_Vertex aProxVtx2 = BRepLib_MakeVertex (aTool.ProximityPoint2());
 
-    theDI << aStr << " \n";
+    DBRep::Set ("ProxPnt1", aProxVtx1);
+    DBRep::Set ("ProxPnt2", aProxVtx2);
+
+    // proximity points' status
+    TCollection_AsciiString ProxPntStatus1;
+    TCollection_AsciiString ProxPntStatus2;
+
+    switch (aTool.ProxPntStatus1()) 
+    {
+      case 0: ProxPntStatus1 = "Border"; break;
+      case 1: ProxPntStatus1 = "Middle"; break;
+      default: ProxPntStatus1 = "Unknown";
+    }
+
+    switch (aTool.ProxPntStatus2())
+    {
+    case 0: ProxPntStatus2 = "Border"; break;
+    case 1: ProxPntStatus2 = "Middle"; break;
+    default: ProxPntStatus2 = "Unknown";
+    }
+
+    theDI << " Status of ProxPnt1 on " << theArgs[1] << " : " << ProxPntStatus1 << "\n";
+    theDI << " Status of ProxPnt2 on " << theArgs[2] << " : " << ProxPntStatus2 << "\n";
   }
-
-  TopoDS_Compound aFaceCompound2;
-  aCompBuilder.MakeCompound (aFaceCompound2);
-
-  for (BRepExtrema_MapOfIntegerPackedMapOfInteger::Iterator anIt2 (aTool.OverlapSubShapes2()); anIt2.More(); anIt2.Next())
+  else
   {
-    TCollection_AsciiString aStr = TCollection_AsciiString (theArgs[2]) + "_" + (anIt2.Key() + 1);
+    TopoDS_Builder aCompBuilder;
 
-    const TopoDS_Face& aFace = aTool.GetSubShape2 (anIt2.Key());
-    aCompBuilder.Add (aFaceCompound2, aFace);
-    DBRep::Set (aStr.ToCString(), aFace);
+    TopoDS_Compound aFaceCompound1;
+    aCompBuilder.MakeCompound(aFaceCompound1);
 
-    theDI << aStr << " \n";
+    for (BRepExtrema_MapOfIntegerPackedMapOfInteger::Iterator anIt1(aTool.OverlapSubShapes1()); anIt1.More(); anIt1.Next())
+    {
+      TCollection_AsciiString aStr = TCollection_AsciiString(theArgs[1]) + "_" + (anIt1.Key() + 1);
+
+      const TopoDS_Shape& aShape = aTool.GetSubShape1(anIt1.Key());
+      aCompBuilder.Add(aFaceCompound1, aShape);
+      DBRep::Set(aStr.ToCString(), aShape);
+
+      theDI << aStr << " \n";
+    }
+
+    TopoDS_Compound aFaceCompound2;
+    aCompBuilder.MakeCompound(aFaceCompound2);
+
+    for (BRepExtrema_MapOfIntegerPackedMapOfInteger::Iterator anIt2(aTool.OverlapSubShapes2()); anIt2.More(); anIt2.Next())
+    {
+      TCollection_AsciiString aStr = TCollection_AsciiString(theArgs[2]) + "_" + (anIt2.Key() + 1);
+
+      const TopoDS_Shape& aShape = aTool.GetSubShape2(anIt2.Key());
+      aCompBuilder.Add(aFaceCompound2, aShape);
+      DBRep::Set(aStr.ToCString(), aShape);
+
+      theDI << aStr << " \n";
+    }
+
+    DBRep::Set((TCollection_AsciiString(theArgs[1]) + "_" + "overlapped").ToCString(), aFaceCompound1);
+    DBRep::Set((TCollection_AsciiString(theArgs[2]) + "_" + "overlapped").ToCString(), aFaceCompound2);
   }
 
-  DBRep::Set ((TCollection_AsciiString (theArgs[1]) + "_" + "overlapped").ToCString(), aFaceCompound1);
-  DBRep::Set ((TCollection_AsciiString (theArgs[2]) + "_" + "overlapped").ToCString(), aFaceCompound2);
-
   return 0;
 }
 
@@ -445,12 +493,14 @@ void BRepTest::ExtremaCommands (Draw_Interpretor& theCommands)
                    aGroup);
 
   theCommands.Add ("proximity",
-                   "proximity Shape1 Shape2 [-tol <value>] [-profile]"
+                   "proximity Shape1 Shape2 [-tol <value> | -value] [-profile]"
                    "\n\t\t: Searches for pairs of overlapping faces of the given shapes."
                    "\n\t\t: The options are:"
                    "\n\t\t:   -tol     : non-negative tolerance value used for overlapping"
                    "\n\t\t:              test (for zero tolerance, the strict intersection"
                    "\n\t\t:              test will be performed)"
+                   "\n\t\t:   -value   : compute the proximity value (minimal value which"
+                   "\n\t\t:              shows both shapes fully overlapped)"
                    "\n\t\t:   -profile : outputs execution time for main algorithm stages",
                    __FILE__,
                    ShapeProximity,

src/BRepTest/BRepTest_FeatureCommands.cxx

@@ -112,6 +112,7 @@ static Standard_Boolean pidef = Standard_False;
 static Standard_Boolean lfdef = Standard_False;
 static Standard_Boolean rfdef = Standard_False;
 
+static Standard_Real tesp = 1.0e-4;
 static Standard_Real t3d = 1.e-4;
 static Standard_Real t2d = 1.e-5;
 static Standard_Real ta = 1.e-2;
@@ -2361,7 +2362,7 @@ static Standard_Integer BOSS(Draw_Interpretor& theCommands,
     if (Rakk)
       delete Rakk;
     Rakk = new BRepFilletAPI_MakeFillet(V, FSh);
-    Rakk->SetParams(ta, t3d, t2d, t3d, t2d, fl);
+    Rakk->SetParams(ta, tesp, t2d, t3d, t2d, fl);
     Rakk->SetContinuity(blend_cont, tapp_angle);
     Standard_Real Rad;
     TopoDS_Shape S;

src/BRepTest/BRepTest_FilletCommands.cxx

@@ -47,7 +47,7 @@
 
 #include <stdio.h>
 
-
+static Standard_Real tesp = 1.0e-4;
 static Standard_Real t3d = 1.e-4;
 static Standard_Real t2d = 1.e-5;
 static Standard_Real ta  = 1.e-2;
@@ -152,7 +152,7 @@ static Standard_Integer BLEND(Draw_Interpretor& di, Standard_Integer narg, const
     }
   }
   Rakk = new BRepFilletAPI_MakeFillet(V,FSh);
-  Rakk->SetParams(ta,t3d,t2d,t3d,t2d,fl);
+  Rakk->SetParams(ta, tesp, t2d, t3d, t2d, fl);
   Rakk->SetContinuity(blend_cont, tapp_angle);
   Standard_Real Rad;
   TopoDS_Edge E;
@@ -254,7 +254,7 @@ static Standard_Integer MKEVOL(Draw_Interpretor& di,
   if (narg < 3) return 1;
   TopoDS_Shape V = DBRep::Get(a[2]);
   Rake = new BRepFilletAPI_MakeFillet(V);
-  Rake->SetParams(ta,t3d,t2d,t3d,t2d,fl);
+  Rake->SetParams(ta, tesp, t2d, t3d, t2d, fl);
   Rake->SetContinuity(blend_cont, tapp_angle);
   if (narg == 4) {
     ChFi3d_FilletShape FSh = ChFi3d_Rational;
@@ -410,7 +410,7 @@ Standard_Integer boptopoblend(Draw_Interpretor& di, Standard_Integer narg, const
     const TopoDS_Shape& aSolid = Explo.Current();
 
     BRepFilletAPI_MakeFillet Blender(aSolid);
-    Blender.SetParams(ta,t3d,t2d,t3d,t2d,fl);
+    Blender.SetParams(ta, tesp, t2d, t3d, t2d, fl);
     Blender.SetContinuity( blend_cont, tapp_angle );
 
     TopExp_Explorer expsec( theSection, TopAbs_EDGE );

src/BRepTest/BRepTest_MatCommands.cxx

@@ -35,6 +35,7 @@
 #include <Bisector_BisecAna.hxx>
 #include <Precision.hxx>
 
+#include <BRepOffsetAPI_MakeOffset.hxx>
 #include <BRepMAT2d_Explorer.hxx>
 #include <BRepMAT2d_BisectingLocus.hxx>
 #include <BRepMAT2d_LinkTopoBilo.hxx>
@@ -44,6 +45,7 @@
 
 #include <DBRep.hxx>
 #include <TopoDS.hxx>
+#include <TopoDS_Face.hxx>
 
 #ifdef _WIN32
 Standard_IMPORT Draw_Viewer dout;
@@ -70,7 +72,16 @@ static Standard_Integer topoload (Draw_Interpretor& , Standard_Integer argc, con
 
   if (C1.IsNull()) return 1;
 
-  anExplo.Perform (TopoDS::Face(C1));
+  TopoDS_Face aFace = TopoDS::Face(C1);
+  
+  if (argc >= 3 &&
+      (strcmp(argv[2], "-approx") == 0))
+  {
+    Standard_Real aTol = 0.1;
+    aFace = BRepOffsetAPI_MakeOffset::ConvertFace (aFace, aTol);
+  }
+
+  anExplo.Perform (aFace);
   return 0;
 }
 
@@ -267,7 +278,7 @@ void DrawCurve(const Handle(Geom2d_Curve)& aCurve,
 
 void BRepTest::MatCommands (Draw_Interpretor& theCommands)
 {
-  theCommands.Add("topoload","load face",__FILE__,topoload);
+  theCommands.Add("topoload","load face: topoload face [-approx]",__FILE__,topoload);
   theCommands.Add("drawcont","display current contour",__FILE__,drawcont);
   theCommands.Add("mat","computes the mat: mat [a/i [o]]",__FILE__,mat);
   theCommands.Add("side","side left/right",__FILE__,side);

src/BRepTest/BRepTest_SweepCommands.cxx

@@ -443,7 +443,7 @@ Standard_Integer gener(Draw_Interpretor&, Standard_Integer n, const char** a)
 //purpose  : 
 //=======================================================================
 
-Standard_Integer thrusections(Draw_Interpretor&, Standard_Integer n, const char** a)
+Standard_Integer thrusections(Draw_Interpretor& di, Standard_Integer n, const char** a)
 {
   if (n < 6) return 1;
 
@@ -525,7 +525,30 @@ Standard_Integer thrusections(Draw_Interpretor&, Standard_Integer n, const char*
       BRepTest_Objects::SetHistory(Generator->Wires(), *Generator);
   }
   else {
-    std::cout << "Algorithm is not done" << std::endl;
+    BRepFill_ThruSectionErrorStatus aStatus = Generator->GetStatus();
+    switch (aStatus)
+    {
+    case BRepFill_ThruSectionErrorStatus_NotDone:
+      di << "Algorithm is not done\n";
+      break;
+    case BRepFill_ThruSectionErrorStatus_NotSameTopology:
+      di << "The input profiles should be all closed or all opened\n";
+      break;
+    case BRepFill_ThruSectionErrorStatus_ProfilesInconsistent:
+      di << "Profiles inconsistent\n";
+      break;
+    case BRepFill_ThruSectionErrorStatus_WrongUsage:
+      di << "Wrong usage of punctual sections\n";
+      break;
+    case BRepFill_ThruSectionErrorStatus_Null3DCurve:
+      di << "Some edges have null 3d curve";
+      break;
+    case BRepFill_ThruSectionErrorStatus_Failed:
+      di << "Algorithm has failed\n";
+      break;
+    default:
+      break;
+    }
   }
 
   return 0;

src/BSplCLib/BSplCLib.cxx

@@ -4234,6 +4234,133 @@ void BSplCLib::Resolution(      Standard_Real&        Poles,
     UTolerance = Tolerance3D / RealSmall();
 }
 
+//=======================================================================
+// function : Intervals 
+// purpose  : 
+//=======================================================================
+Standard_Integer BSplCLib::Intervals (const TColStd_Array1OfReal& theKnots,
+                                      const TColStd_Array1OfInteger& theMults,
+                                      Standard_Integer theDegree,
+                                      Standard_Boolean isPeriodic,
+                                      Standard_Integer theContinuity,
+                                      Standard_Real theFirst,
+                                      Standard_Real theLast,
+                                      Standard_Real theTolerance,
+                                      TColStd_Array1OfReal* theIntervals) 
+{
+  // remove all knots with multiplicity less or equal than (degree - continuity) except first and last
+  Standard_Integer aFirstIndex = isPeriodic ? 1 : FirstUKnotIndex (theDegree, theMults);
+  Standard_Integer aLastIndex = isPeriodic ? theKnots.Size() : LastUKnotIndex (theDegree, theMults);
+  TColStd_Array1OfReal aNewKnots (1, aLastIndex - aFirstIndex + 1);
+  Standard_Integer aNbNewKnots = 0;
+  for (Standard_Integer anIndex = aFirstIndex; anIndex <= aLastIndex; anIndex++)
+  {
+    if (theMults(anIndex) > (theDegree - theContinuity) ||
+    anIndex == aFirstIndex ||
+    anIndex == aLastIndex)
+    {
+      aNbNewKnots++;
+      aNewKnots(aNbNewKnots) = theKnots[anIndex];
+    }
+  }
+  aNewKnots.Resize (1, aNbNewKnots, Standard_True);
+
+  // the range boundaries 
+  Standard_Real aCurFirst = theFirst;
+  Standard_Real aCurLast = theLast;
+  Standard_Real aPeriod = 0.0;
+  Standard_Integer aFirstPeriod = 0;
+  Standard_Integer aLastPeriod = 0;
+  // move boundaries into period
+  if (isPeriodic)
+  {
+    Standard_Real aLower = theKnots.First();
+    Standard_Real anUpper = theKnots.Last();
+    aPeriod = anUpper - aLower;
+    
+    while (aCurFirst < aLower)
+    {
+      aCurFirst += aPeriod;
+      aFirstPeriod--;
+    }
+    while (aCurLast < aLower)
+    {
+      aCurLast += aPeriod;
+      aLastPeriod--;
+    }
+    while (aCurFirst >= anUpper)
+    {
+      aCurFirst -= aPeriod;
+      aFirstPeriod += 1;
+    }
+    while (aCurLast >= anUpper)
+    {
+      aCurLast -= aPeriod;
+      aLastPeriod += 1;
+    }
+  }
+  // locate the left and nearest knot for boundaries
+  Standard_Integer anIndex1 = 0;
+  Standard_Integer anIndex2 = 0;
+  Standard_Real aDummyDouble;
+  // we use version of LocateParameter that doesn't need multiplicities
+  LocateParameter(theDegree, aNewKnots, TColStd_Array1OfInteger(), aCurFirst, Standard_False, 1, aNbNewKnots, anIndex1, aDummyDouble);
+  LocateParameter(theDegree, aNewKnots, TColStd_Array1OfInteger(), aCurLast, Standard_False, 1, aNbNewKnots, anIndex2, aDummyDouble);
+  // the case when the beginning of the range coincides with the next knot
+  if (anIndex1 < aNbNewKnots && Abs(aNewKnots[anIndex1 + 1] - aCurFirst) < theTolerance)
+  {
+    anIndex1 += 1;
+  }
+  // the case when the ending of the range coincides with the current knot
+  if (aNbNewKnots && Abs(aNewKnots[anIndex2] - aCurLast) < theTolerance)
+  {
+    anIndex2 -= 1;
+  }
+  Standard_Integer aNbIntervals = anIndex2 - anIndex1 + 1 + (aLastPeriod - aFirstPeriod) * (aNbNewKnots - 1);
+  
+  // fill the interval array
+  if (theIntervals)
+  {
+    theIntervals->Resize (1, aNbIntervals + 1, Standard_False);
+    if (isPeriodic && aLastPeriod != aFirstPeriod)
+    {
+      Standard_Integer anIndex = 1;
+      // part from the begging of range to the end of the first period
+      for (Standard_Integer i = anIndex1; i < aNewKnots.Size(); i++, anIndex++)
+      {
+        theIntervals->ChangeValue(anIndex) = aNewKnots[i] + aFirstPeriod * aPeriod;
+      }
+      // full periods
+      for (Standard_Integer aPeriodNum = aFirstPeriod + 1; aPeriodNum < aLastPeriod; aPeriodNum++)
+      {
+        for (Standard_Integer i = 1; i < aNewKnots.Size(); i++, anIndex++)
+        {
+          theIntervals->ChangeValue(anIndex) = aNewKnots[i] + aPeriodNum * aPeriod;
+        }
+      }
+      // part from the begging of the last period to the end of range
+      for (Standard_Integer i = 1; i <= anIndex2; i++, anIndex++)
+      {
+        theIntervals->ChangeValue(anIndex) = aNewKnots[i] + aLastPeriod * aPeriod;
+      }
+    }
+    else
+    {
+      Standard_Integer anIndex = 1;
+      for (Standard_Integer i = anIndex1; i <= anIndex2; i++, anIndex++)
+      {
+        theIntervals->ChangeValue(anIndex) = aNewKnots[i] + aFirstPeriod * aPeriod;
+      }
+    }
+    // update the first position (the begging of range doesn't coincide with the knot at anIndex1 in general)
+    theIntervals->ChangeValue(1) = theFirst;
+    // write the ending of the range (we didn't write it at all)
+    theIntervals->ChangeValue(aNbIntervals + 1) = theLast;
+  }
+  
+  return aNbIntervals;
+}
+
 //=======================================================================
 // function: FlatBezierKnots
 // purpose :

src/BSplCLib/BSplCLib.hxx

@@ -1456,8 +1456,26 @@ public:
   //! we have |f (u1) - f (u0)| < Tolerance3D
   Standard_EXPORT static void Resolution (const TColgp_Array1OfPnt2d& Poles, const TColStd_Array1OfReal* Weights, const Standard_Integer NumPoles, const TColStd_Array1OfReal& FlatKnots, const Standard_Integer Degree, const Standard_Real Tolerance3D, Standard_Real& UTolerance);
 
-
-
+  //! Splits the given range to BSpline intervals of given continuity
+  //! @param[in] theKnots the knots of BSpline
+  //! @param[in] theMults the knots' multiplicities
+  //! @param[in] theDegree the degree of BSpline
+  //! @param[in] isPeriodic the periodicity of BSpline
+  //! @param[in] theContinuity the target interval's continuity 
+  //! @param[in] theFirst the begin of the target range
+  //! @param[in] theLast the end of the target range
+  //! @param[in] theTolerance the tolerance
+  //! @param[in,out] theIntervals the array to store intervals if isn't nullptr
+  //! @return the number of intervals
+  Standard_EXPORT static Standard_Integer Intervals (const TColStd_Array1OfReal& theKnots,
+                                                     const TColStd_Array1OfInteger& theMults,
+                                                     Standard_Integer theDegree,
+                                                     Standard_Boolean isPeriodic,
+                                                     Standard_Integer theContinuity,
+                                                     Standard_Real theFirst,
+                                                     Standard_Real theLast,
+                                                     Standard_Real theTolerance,
+                                                     TColStd_Array1OfReal* theIntervals);
 
 protected:
 

src/BSplCLib/BSplCLib_2.cxx

@@ -1157,82 +1157,97 @@ void BSplCLib::MergeBSplineKnots
   index,
   num_knots ;
   if (StartValue < EndValue - Tolerance) {
-    TColStd_Array1OfReal knots1(1,Knots1.Length()) ;
-    TColStd_Array1OfReal knots2(1,Knots2.Length()) ;
-    degree = Degree1 + Degree2 ;
-    index = 1 ;
+    TColStd_Array1OfReal knots1(1, Knots1.Length());
+    TColStd_Array1OfReal knots2(1, Knots2.Length());
+    degree = Degree1 + Degree2;
+    index = 1;
 
-    for (ii = Knots1.Lower() ; ii <= Knots1.Upper() ; ii++) {
-      knots1(index) = Knots1(ii) ;
-      index += 1 ;
+    for (ii = Knots1.Lower(); ii <= Knots1.Upper(); ii++) {
+      knots1(index) = Knots1(ii);
+      index += 1;
     }
-    index = 1 ;
+    index = 1;
 
-    for (ii = Knots2.Lower() ; ii <= Knots2.Upper() ; ii++) {
-      knots2(index) = Knots2(ii) ;
-      index += 1 ;
+    for (ii = Knots2.Lower(); ii <= Knots2.Upper(); ii++) {
+      knots2(index) = Knots2(ii);
+      index += 1;
     }
     BSplCLib::Reparametrize(StartValue,
-			    EndValue,
-			    knots1) ;
-    
-    BSplCLib::Reparametrize(StartValue,
-			    EndValue,
-			    knots2) ;
-    num_knots = 0 ;
-    jj =  1 ;
+      EndValue,
+      knots1);
 
-    for (ii = 1 ; ii <= knots1.Length() ; ii++) {
+    BSplCLib::Reparametrize(StartValue,
+      EndValue,
+      knots2);
+    num_knots = 0;
+    jj = 1;
+
+    for (ii = 1; ii <= knots1.Length(); ii++) {
 
       while (jj <= knots2.Length() && knots2(jj) <= knots1(ii) - Tolerance) {
-	jj += 1 ;
-	num_knots += 1 ;
+        jj += 1;
+        num_knots += 1;
       }
 
       while (jj <= knots2.Length() && knots2(jj) <= knots1(ii) + Tolerance) {
-	jj += 1 ;
+        jj += 1;
       }
-      num_knots += 1 ;
+      num_knots += 1;
     }
-    NewKnots = 
-      new TColStd_HArray1OfReal(1,num_knots) ;
+    NewKnots =
+      new TColStd_HArray1OfReal(1, num_knots);
     NewMults =
-      new TColStd_HArray1OfInteger(1,num_knots) ;
-    num_knots = 1 ;
-    jj = 1 ;
+      new TColStd_HArray1OfInteger(1, num_knots);
+    num_knots = 1;
+    jj = 1;
 
-    for (ii = 1 ; ii <= knots1.Length() ; ii++) {
+    for (ii = 1; ii <= knots1.Length(); ii++) {
 
       while (jj <= knots2.Length() && knots2(jj) <= knots1(ii) - Tolerance) {
-	NewKnots->ChangeArray1()(num_knots) = knots2(jj) ;
-        NewMults->ChangeArray1()(num_knots) = Mults2(jj) + Degree1 ;
-	jj += 1 ;
-	num_knots += 1 ;
+        NewKnots->ChangeArray1()(num_knots) = knots2(jj);
+        NewMults->ChangeArray1()(num_knots) = Mults2(jj) + Degree1;
+        jj += 1;
+        num_knots += 1;
       }
-      set_mults_flag = 0 ;
+      set_mults_flag = 0;
 
       while (jj <= knots2.Length() && knots2(jj) <= knots1(ii) + Tolerance) {
-	continuity = Min(Degree1 - Mults1(ii), Degree2 - Mults2(jj)) ;
-        set_mults_flag = 1 ;
-	NewMults->ChangeArray1()(num_knots) = degree - continuity ;
-	jj += 1 ;
+        continuity = Min(Degree1 - Mults1(ii), Degree2 - Mults2(jj));
+        set_mults_flag = 1;
+        NewMults->ChangeArray1()(num_knots) = degree - continuity;
+        jj += 1;
       }
 
-      NewKnots->ChangeArray1()(num_knots) = knots1(ii) ;
-      if (! set_mults_flag) {
-	NewMults->ChangeArray1()(num_knots) = Mults1(ii) + Degree2 ;
+      NewKnots->ChangeArray1()(num_knots) = knots1(ii);
+      if (!set_mults_flag) {
+        NewMults->ChangeArray1()(num_knots) = Mults1(ii) + Degree2;
       }
-      num_knots += 1 ;
+      num_knots += 1;
     }
-    num_knots -= 1 ;
-    NewMults->ChangeArray1()(1) = degree + 1 ;
-    NewMults->ChangeArray1()(num_knots) = degree + 1 ;
-    index = 0 ;
+    num_knots -= 1;
+    NewMults->ChangeArray1()(1) = degree + 1;
+    NewMults->ChangeArray1()(num_knots) = degree + 1;
+    index = 0;
 
-    for (ii = 1 ; ii <= num_knots ; ii++) {
-      index += NewMults->Value(ii) ;
+    for (ii = 1; ii <= num_knots; ii++) {
+      index += NewMults->Value(ii);
     }
-    NumPoles = index  - degree - 1  ;
+    NumPoles = index - degree - 1;
+  }
+  else
+  {
+    degree = Degree1 + Degree2;
+    num_knots = 2;
+    NewKnots =
+      new TColStd_HArray1OfReal(1, num_knots);
+    NewKnots->ChangeArray1()(1) = StartValue;
+    NewKnots->ChangeArray1()(num_knots) = EndValue;
+
+    NewMults = 
+      new TColStd_HArray1OfInteger(1, num_knots);
+    NewMults->ChangeArray1()(1) = degree + 1;
+    NewMults->ChangeArray1()(num_knots) = degree + 1;
+    NumPoles = BSplCLib::NbPoles(degree, Standard_False, NewMults->Array1());
   }
 }
       

src/BVH/BVH_Box.hxx

@@ -64,19 +64,18 @@ public:
   //! given transformation to this box.
   BVH_Box<T, 3> Transformed (const NCollection_Mat4<T>& theTransform) const
   {
-    BVH_Box<T, 3> aResultBox;
-
+    const BVH_Box<T, 3> *aThis = static_cast<const BVH_Box<T, 3>*>(this);
     if (theTransform.IsIdentity())
     {
-      return aResultBox;
+      return *aThis;
     }
 
-    const BVH_Box<T, 3> *aThis = static_cast<const BVH_Box<T, 3>*>(this);
     if (!aThis->IsValid())
     {
-      return aResultBox;
+      return *aThis;
     }
 
+    BVH_Box<T, 3> aResultBox;
     for (size_t aX = 0; aX <= 1; ++aX)
     {
       for (size_t aY = 0; aY <= 1; ++aY)

src/BVH/BVH_Tools.hxx

@@ -30,6 +30,15 @@ public: //! @name public types
 
   typedef typename BVH::VectorType<T, N>::Type BVH_VecNt;
 
+public:
+
+  enum BVH_PrjStateInTriangle
+  {
+    BVH_PrjStateInTriangle_VERTEX,
+    BVH_PrjStateInTriangle_EDGE,
+    BVH_PrjStateInTriangle_INNER
+  };
+
 public: //! @name Box-Box Square distance
 
   //! Computes Square distance between Axis aligned bounding boxes
@@ -113,11 +122,14 @@ public: //! @name Point-Box projection
 
 public: //! @name Point-Triangle Square distance
 
-  //! Computes square distance between point and triangle
-  static T PointTriangleSquareDistance (const BVH_VecNt& thePoint,
-                                        const BVH_VecNt& theNode0,
-                                        const BVH_VecNt& theNode1,
-                                        const BVH_VecNt& theNode2)
+  //! Find nearest point on a triangle for the given point
+  static BVH_VecNt PointTriangleProjection (const BVH_VecNt& thePoint,
+                                            const BVH_VecNt& theNode0,
+                                            const BVH_VecNt& theNode1,
+                                            const BVH_VecNt& theNode2,
+                                            BVH_PrjStateInTriangle* thePrjState = nullptr,
+                                            Standard_Integer* theNumberOfFirstNode = nullptr,
+                                            Standard_Integer* theNumberOfLastNode = nullptr)
   {
     const BVH_VecNt aAB = theNode1 - theNode0;
     const BVH_VecNt aAC = theNode2 - theNode0;
@@ -128,68 +140,110 @@ public: //! @name Point-Triangle Square distance
   
     if (aABdotAP <= 0. && aACdotAP <= 0.)
     {
-      return aAP.Dot(aAP);
+      if (thePrjState != nullptr)
+      {
+        *thePrjState = BVH_PrjStateInTriangle_VERTEX;
+        *theNumberOfFirstNode = 0;
+        *theNumberOfLastNode = 0;
+      }
+      return theNode0;
     }
-  
+
     const BVH_VecNt aBC = theNode2 - theNode1;
     const BVH_VecNt aBP = thePoint - theNode1;
-  
-    T aBAdotBP = -(aAB.Dot(aBP));
-    T aBCdotBP =  (aBC.Dot(aBP));
-  
+
+    T aBAdotBP = -(aAB.Dot (aBP));
+    T aBCdotBP = (aBC.Dot (aBP));
+
     if (aBAdotBP <= 0. && aBCdotBP <= 0.)
     {
-      return (aBP.Dot(aBP));
+      if (thePrjState != nullptr)
+      {
+        *thePrjState = BVH_PrjStateInTriangle_VERTEX;
+        *theNumberOfFirstNode = 1;
+        *theNumberOfLastNode = 1;
+      }
+      return theNode1;
     }
-  
+
     const BVH_VecNt aCP = thePoint - theNode2;
-  
-    T aCBdotCP = -(aBC.Dot(aCP));
-    T aCAdotCP = -(aAC.Dot(aCP));
-  
+
+    T aCBdotCP = -(aBC.Dot (aCP));
+    T aCAdotCP = -(aAC.Dot (aCP));
+
     if (aCAdotCP <= 0. && aCBdotCP <= 0.)
     {
-      return (aCP.Dot(aCP));
+      if (thePrjState != nullptr)
+      {
+        *thePrjState = BVH_PrjStateInTriangle_VERTEX;
+        *theNumberOfFirstNode = 2;
+        *theNumberOfLastNode = 2;
+      }
+      return theNode2;
     }
-  
-    T aACdotBP = (aAC.Dot(aBP));
-  
+
+    T aACdotBP = (aAC.Dot (aBP));
+
     T aVC = aABdotAP * aACdotBP + aBAdotBP * aACdotAP;
-  
+
     if (aVC <= 0. && aABdotAP > 0. && aBAdotBP > 0.)
     {
-      const BVH_VecNt aDirect = aAP - aAB * (aABdotAP / (aABdotAP + aBAdotBP));
-  
-      return (aDirect.Dot(aDirect));
+      if (thePrjState != nullptr)
+      {
+        *thePrjState = BVH_PrjStateInTriangle_EDGE;
+        *theNumberOfFirstNode = 0;
+        *theNumberOfLastNode = 1;
+      }
+      return theNode0 + aAB * (aABdotAP / (aABdotAP + aBAdotBP));
     }
-  
-    T aABdotCP = (aAB.Dot(aCP));
-  
+
+    T aABdotCP = (aAB.Dot (aCP));
+
     T aVA = aBAdotBP * aCAdotCP - aABdotCP * aACdotBP;
-  
+
     if (aVA <= 0. && aBCdotBP > 0. && aCBdotCP > 0.)
     {
-      const BVH_VecNt aDirect = aBP - aBC * (aBCdotBP / (aBCdotBP + aCBdotCP));
-  
-      return (aDirect.Dot(aDirect));
+      if (thePrjState != nullptr)
+      {
+        *thePrjState = BVH_PrjStateInTriangle_EDGE;
+        *theNumberOfFirstNode = 1;
+        *theNumberOfLastNode = 2;
+      }
+      return theNode1 + aBC * (aBCdotBP / (aBCdotBP + aCBdotCP));
     }
-  
+
     T aVB = aABdotCP * aACdotAP + aABdotAP * aCAdotCP;
-  
+
     if (aVB <= 0. && aACdotAP > 0. && aCAdotCP > 0.)
     {
-      const BVH_VecNt aDirect = aAP - aAC * (aACdotAP / (aACdotAP + aCAdotCP));
-  
-      return (aDirect.Dot(aDirect));
+      if (thePrjState != nullptr)
+      {
+        *thePrjState = BVH_PrjStateInTriangle_EDGE;
+        *theNumberOfFirstNode = 2;
+        *theNumberOfLastNode = 0;
+      }
+      return theNode0 + aAC * (aACdotAP / (aACdotAP + aCAdotCP));
     }
-  
+
     T aNorm = aVA + aVB + aVC;
-  
-    const BVH_VecNt& aDirect = thePoint - (theNode0 * aVA +
-                                           theNode1 * aVB +
-                                           theNode2 * aVC) / aNorm;
-  
-    return (aDirect.Dot(aDirect));
+
+    if (thePrjState != nullptr)
+    {
+      *thePrjState = BVH_PrjStateInTriangle_INNER;
+    }
+
+    return (theNode0 * aVA + theNode1 * aVB + theNode2 * aVC) / aNorm;
+  }
+
+  //! Computes square distance between point and triangle
+  static T PointTriangleSquareDistance (const BVH_VecNt& thePoint,
+                                        const BVH_VecNt& theNode0,
+                                        const BVH_VecNt& theNode1,
+                                        const BVH_VecNt& theNode2)
+  {
+    const BVH_VecNt aProj = PointTriangleProjection(thePoint, theNode0, theNode1, theNode2);
+    const BVH_VecNt aPP = aProj - thePoint;
+    return aPP.Dot(aPP);
   }
 
 public: //! @name Ray-Box Intersection

src/Blend/Blend_CSWalking_1.gxx

@@ -28,9 +28,9 @@ void Blend_CSWalking::Perform(Blend_CSFunction& Func,
 			      const Standard_Real Pdep,   
 			      const Standard_Real Pmax,
 			      const Standard_Real MaxStep,
+            const Standard_Real Tol3d,
 			      const Standard_Real TolGuide,
 			      const math_Vector& ParDep,
-			      const Standard_Real Tolesp,
 			      const Standard_Real Fleche,
 			      const Standard_Boolean Appro)
 {
@@ -40,7 +40,7 @@ void Blend_CSWalking::Perform(Blend_CSFunction& Func,
   comptra = Standard_False;
   line = new TheLine ();
   Standard_Integer Nbvar = Func.NbVariables();
-  tolesp = Abs(Tolesp);
+  tolpoint3d = Tol3d;
   tolgui = Abs(TolGuide);
   fleche = Abs(Fleche);
   rebrou = Standard_False;
@@ -68,7 +68,7 @@ void Blend_CSWalking::Perform(Blend_CSFunction& Func,
     TopAbs_State situ;
 //    math_Vector tolerance(1,3),infbound(1,3),supbound(1,3);
     math_Vector tolerance(1,Nbvar),infbound(1,Nbvar),supbound(1,Nbvar);
-    Func.GetTolerance(tolerance,tolesp);
+    Func.GetTolerance(tolerance,tolpoint3d);
     Func.GetBounds(infbound,supbound);
     math_FunctionSetRoot rsnld(Func,tolerance,30);
 
@@ -115,8 +115,8 @@ void Blend_CSWalking::Perform(Blend_CSFunction& Func,
   Standard_Real U,V,W;
   previousP.ParametersOnS(U,V);
   W = previousP.ParameterOnC();
-  TheExtremity P1(previousP.PointOnS(),U,V,previousP.Parameter(),tolesp);
-  TheExtremity P2(previousP.PointOnC(),W,previousP.Parameter(),tolesp);
+  TheExtremity P1(previousP.PointOnS(),U,V,previousP.Parameter(),tolpoint3d);
+  TheExtremity P2(previousP.PointOnC(),W,previousP.Parameter(),tolpoint3d);
   if (sens>0.) {
     line->SetStartPoints(P1,P2);
   }

src/Blend/Blend_CSWalking_2.gxx

@@ -39,7 +39,7 @@ Blend_Status Blend_CSWalking::TestArret(Blend_CSFunction& Function,
   Blend_Status State1,State2;
   IntSurf_TypeTrans tras = IntSurf_Undecided;
 
-  if (Function.IsSolution(Sol,tolesp)) {
+  if (Function.IsSolution(Sol,tolpoint3d)) {
 
     pt1  = Function.PointOnS();
     pt2  = Function.PointOnC();
@@ -176,15 +176,16 @@ Blend_Status Blend_CSWalking::CheckDeflectionOnSurf
 
   prevP = previousP.PointOnS();
   prevTg = previousP.TangentOnS();
-  tolu = TheSurfaceTool::UResolution(surf,tolesp);
-  tolv = TheSurfaceTool::VResolution(surf,tolesp);
+  tolu = TheSurfaceTool::UResolution(surf,tolpoint3d);
+  tolv = TheSurfaceTool::VResolution(surf,tolpoint3d);
 
   gp_Vec Corde(prevP,Psurf);
   Norme = Corde.SquareMagnitude();
   prevNorme = prevTg.SquareMagnitude(); // JAG MODIF 25.04.94
 
 
-  if (Norme <= tolesp*tolesp || prevNorme <= tolesp*tolesp) { // JAG MODIF 25.04.94
+  const Standard_Real toler3d = tolpoint3d;
+  if (Norme <= toler3d * toler3d || prevNorme <= toler3d * toler3d) { // JAG MODIF 25.04.94
     // il faudra peut etre  forcer meme point  JAG MODIF 25.04.94
     return Blend_SamePoints;
   }
@@ -275,19 +276,20 @@ Blend_Status Blend_CSWalking::CheckDeflectionOnCurv
 
   prevP = previousP.PointOnC();
   prevTg = previousP.TangentOnC();
-  tolu = TheCurveTool::Resolution(curv,tolesp);
+  tolu = TheCurveTool::Resolution(curv,tolpoint3d);
 
   gp_Vec Corde(prevP,Pcurv);
   Norme = Corde.SquareMagnitude();
   prevNorme = prevTg.SquareMagnitude(); // JAG MODIF 25.04.94
 
 
+  const Standard_Real toler3d = tolpoint3d;
 // if (Norme <= tolesp*tolesp || prevNorme <= tolesp*tolesp) { // JAG MODIF 25.04.94
-  if (Norme <= tolesp*tolesp) { // le 95.01.10
+  if (Norme <= toler3d * toler3d) { // le 95.01.10
     // il faudra peut etre  forcer meme point  JAG MODIF 25.04.94
     return Blend_SamePoints;
   }
-  else if (prevNorme > tolesp*tolesp) {
+  else if (prevNorme > toler3d * toler3d) {
     Cosi = sens*Corde*prevTg;
     if (Cosi <0.) { // angle 3d>pi/2. --> retour arriere
       return Blend_Backward;
@@ -308,7 +310,7 @@ Blend_Status Blend_CSWalking::CheckDeflectionOnCurv
 
   // Voir s il faut faire le controle sur le signe de prevtg*Tgsurf
 
-  if (Tgcurv.Magnitude() <= tolesp) {
+  if (Tgcurv.Magnitude() <= tolpoint3d) {
     return Blend_SamePoints; // GROS BOBARD EN ATTENDANT
   }
 
@@ -318,7 +320,7 @@ Blend_Status Blend_CSWalking::CheckDeflectionOnCurv
     return Blend_StepTooLarge;
   }
 
-  if (prevNorme > tolesp*tolesp) {
+  if (prevNorme > toler3d * toler3d) {
 
     // Estimation de la fleche courante
 /*    

src/Blend/Blend_CSWalking_3.gxx

@@ -205,7 +205,7 @@ void Blend_CSWalking::MakeExtremity(TheExtremity& Extrem,
 
 //  Extrem.SetValue(previousP.PointOnS(),sol(1),sol(2),tolesp);
   previousP.ParametersOnS(U,V);
-  Extrem.SetValue(previousP.PointOnS(),U,V,previousP.Parameter(),tolesp);
+  Extrem.SetValue(previousP.PointOnS(),U,V,previousP.Parameter(),tolpoint3d);
   Iter = domain;
 
 

src/Blend/Blend_CSWalking_4.gxx

@@ -40,7 +40,7 @@ void Blend_CSWalking::InternalPerform(Blend_CSFunction& Func,
 
   //IntSurf_Transition Tline,Tarc;
 
-  Func.GetTolerance(tolerance,tolesp);
+  Func.GetTolerance(tolerance,tolpoint3d);
   Func.GetBounds(infbound,supbound);
 
   math_FunctionSetRoot rsnld(Func,tolerance,30);
@@ -146,9 +146,9 @@ void Blend_CSWalking::InternalPerform(Blend_CSFunction& Func,
 */
 	  previousP.ParametersOnS(U,V);
 	  Exts.SetValue(previousP.PointOnS(),U,V, 
-			previousP.Parameter(),tolesp);
+			previousP.Parameter(),tolpoint3d);
 	  Extc.SetValue(previousP.PointOnC(),previousP.ParameterOnC(),
-			previousP.Parameter(),tolesp);
+			previousP.Parameter(),tolpoint3d);
 	  // Indiquer que fin sur Bound.
 	}
 	else {
@@ -171,9 +171,9 @@ void Blend_CSWalking::InternalPerform(Blend_CSFunction& Func,
 */
 	  previousP.ParametersOnS(U,V);
 	  Exts.SetValue(previousP.PointOnS(),U,V,
-			previousP.Parameter(),tolesp);
+			previousP.Parameter(),tolpoint3d);
 	  Extc.SetValue(previousP.PointOnC(),previousP.ParameterOnC(),
-			previousP.Parameter(),tolesp);
+			previousP.Parameter(),tolpoint3d);
 	  Arrive = Standard_True;
 	  if (line->NbPoints()>=2) {
 	    // Indiquer qu on s arrete en cours de cheminement
@@ -214,9 +214,9 @@ void Blend_CSWalking::InternalPerform(Blend_CSFunction& Func,
 */
 	  previousP.ParametersOnS(U,V);
 	  Exts.SetValue(previousP.PointOnS(),U,V,
-			previousP.Parameter(),tolesp);
+			previousP.Parameter(),tolpoint3d);
 	  Extc.SetValue(previousP.PointOnC(),previousP.ParameterOnC(),
-			previousP.Parameter(),tolesp);
+			previousP.Parameter(),tolpoint3d);
 	  // Indiquer que fin sur Bound.
 	}
 	else {
@@ -244,7 +244,7 @@ void Blend_CSWalking::InternalPerform(Blend_CSFunction& Func,
 	MakeExtremity(Exts,Index,solrst(1),Isvtx,Vtx);
 //	Extc.SetValue(previousP.PointOnC(),sol(3),tolesp);
 	Extc.SetValue(previousP.PointOnC(),previousP.ParameterOnC(),
-		      previousP.Parameter(),tolesp);
+		      previousP.Parameter(),tolpoint3d);
 	Arrive = Standard_True;
       }
       break;
@@ -259,9 +259,9 @@ void Blend_CSWalking::InternalPerform(Blend_CSFunction& Func,
 */
 	previousP.ParametersOnS(U,V);
 	Exts.SetValue(previousP.PointOnS(),U,V,
-		      previousP.Parameter(),tolesp);
+		      previousP.Parameter(),tolpoint3d);
 	Extc.SetValue(previousP.PointOnC(),previousP.ParameterOnC(),
-		      previousP.Parameter(),tolesp);
+		      previousP.Parameter(),tolpoint3d);
 	Arrive = Standard_True;
       }
       break;

src/Blend/Blend_Walking_1.gxx

@@ -62,9 +62,9 @@ void Blend_Walking::Perform(Blend_Function& Func,
 			    const Standard_Real Pdep,   
 			    const Standard_Real Pmax,
 			    const Standard_Real MaxStep,
+          const Standard_Real Tol3d,
 			    const Standard_Real TolGuide,
 			    const math_Vector& ParDep,
-			    const Standard_Real Tolesp,
 			    const Standard_Real Fleche,
 			    const Standard_Boolean Appro)
 {
@@ -75,7 +75,7 @@ void Blend_Walking::Perform(Blend_Function& Func,
   Standard_Boolean doextremities = 1;
   if(line.IsNull()) line = new TheLine ();
   else {line->Clear();doextremities = 0;}
-  tolesp = Abs(Tolesp);
+  tolpoint3d = Tol3d;
   tolgui = Abs(TolGuide);
   fleche = Abs(Fleche);
   rebrou = Standard_False;
@@ -96,7 +96,7 @@ void Blend_Walking::Perform(Blend_Function& Func,
 
     TopAbs_State situ1,situ2;
     math_Vector tolerance(1,4),infbound(1,4),supbound(1,4);
-    Func.GetTolerance(tolerance,tolesp);
+    Func.GetTolerance(tolerance,tolpoint3d);
     Func.GetBounds(infbound,supbound);
     math_FunctionSetRoot rsnld(Func,tolerance,30);
 
@@ -143,9 +143,9 @@ void Blend_Walking::Perform(Blend_Function& Func,
 
   if(doextremities){
     TheExtremity ptf1 (previousP.PointOnS1(),
-		       sol(1),sol(2),tolesp);
+		       sol(1),sol(2),tolpoint3d);
     TheExtremity ptf2 (previousP.PointOnS2(),
-		       sol(3),sol(4),tolesp);
+		       sol(3),sol(4),tolpoint3d);
     if (!previousP.IsTangencyPoint()) {
       ptf1.SetTangent(previousP.TangentOnS1());
       ptf2.SetTangent(previousP.TangentOnS2());
@@ -168,7 +168,7 @@ void Blend_Walking::Perform(Blend_Function& Func,
 Standard_Boolean Blend_Walking::PerformFirstSection(Blend_Function&     Func,
                                                     const Standard_Real Pdep,
                                                     math_Vector&        ParDep,
-                                                    const Standard_Real Tolesp,
+                                                    const Standard_Real Tol3d,
                                                     const Standard_Real TolGuide,
                                                     TopAbs_State&       Pos1,
                                                     TopAbs_State&       Pos2)
@@ -176,7 +176,7 @@ Standard_Boolean Blend_Walking::PerformFirstSection(Blend_Function&     Func,
   iscomplete = Standard_False;
   comptra = Standard_False;
   line = new TheLine ();
-  tolesp = Abs(Tolesp);
+  tolpoint3d = Tol3d;
   tolgui = Abs(TolGuide);
 
   Pos1 = Pos2 = TopAbs_UNKNOWN;
@@ -185,7 +185,7 @@ Standard_Boolean Blend_Walking::PerformFirstSection(Blend_Function&     Func,
   Func.Set(param);
 
   math_Vector tolerance(1, 4),infbound(1, 4),supbound(1, 4);
-  Func.GetTolerance(tolerance, tolesp);
+  Func.GetTolerance(tolerance, tolpoint3d);
   Func.GetBounds(infbound, supbound);
   math_FunctionSetRoot rsnld(Func, tolerance, 30);
 
@@ -220,7 +220,7 @@ Standard_Boolean Blend_Walking::PerformFirstSection (Blend_Function& Func,
                                                      const Standard_Real Pdep,
                                                      const Standard_Real Pmax,
                                                      const math_Vector& ParDep,
-                                                     const Standard_Real Tolesp,
+                                                     const Standard_Real Tol3d,
                                                      const Standard_Real TolGuide,
                                                      const Standard_Boolean RecOnS1,
                                                      const Standard_Boolean RecOnS2,
@@ -235,7 +235,7 @@ Standard_Boolean Blend_Walking::PerformFirstSection (Blend_Function& Func,
   Standard_Real w1, w2, extrapol;
   Standard_Boolean recad1, recad2;
 
-  tolesp = Abs(Tolesp);
+  tolpoint3d = Tol3d;
   tolgui = Abs(TolGuide);
   if (Pmax - Pdep >= 0.0)
   {
@@ -262,7 +262,7 @@ Standard_Boolean Blend_Walking::PerformFirstSection (Blend_Function& Func,
   Standard_Real CorrectedU = 0., CorrectedV = 0.;
   gp_Pnt CorrectedPnt;
 
-  Func.GetTolerance(tolerance, tolesp);
+  Func.GetTolerance(tolerance, tolpoint3d);
   Func.GetBounds(infbound, supbound);
   math_FunctionSetRoot rsnld(Func, tolerance, 30);
 
@@ -409,9 +409,9 @@ Standard_Boolean Blend_Walking::PerformFirstSection (Blend_Function& Func,
 #endif
       MakeExtremity(Ext1, Standard_True, Index1, solrst1(1), Isvtx1, Vtx1);
       if (ToCorrectOnRst1)
-        Ext2.SetValue(CorrectedPnt, CorrectedU, CorrectedV, tolesp);
+        Ext2.SetValue(CorrectedPnt, CorrectedU, CorrectedV, tolpoint3d);
       else
-        Ext2.SetValue(previousP.PointOnS2(), sol(3), sol(4), tolesp);
+        Ext2.SetValue(previousP.PointOnS2(), sol(3), sol(4), tolpoint3d);
     }
     break;
 
@@ -424,9 +424,9 @@ Standard_Boolean Blend_Walking::PerformFirstSection (Blend_Function& Func,
       }
 #endif
       if (ToCorrectOnRst2)
-        Ext1.SetValue(CorrectedPnt, CorrectedU, CorrectedV, tolesp);
+        Ext1.SetValue(CorrectedPnt, CorrectedU, CorrectedV, tolpoint3d);
       else
-        Ext1.SetValue(previousP.PointOnS1(), sol(1), sol(2), tolesp);
+        Ext1.SetValue(previousP.PointOnS1(), sol(1), sol(2), tolpoint3d);
       MakeExtremity(Ext2, Standard_False, Index2, solrst2(1), Isvtx2, Vtx2);
     }
     break;

src/Blend/Blend_Walking_2.gxx

@@ -41,7 +41,7 @@ Blend_Status Blend_Walking::TestArret(Blend_Function& Function,
   IntSurf_TypeTrans tras1,tras2;
   Blend_Point curpoint;
   Standard_Boolean loctwist1 = Standard_False, loctwist2 = Standard_False;
-  Standard_Real tolsolu = tolesp;
+  Standard_Real tolsolu = tolpoint3d;
 
   if ( !TestSolu) tolsolu *= 1000; //Ca doit toujours etre bon
   if (Function.IsSolution(sol,tolsolu)) {
@@ -211,8 +211,8 @@ Blend_Status Blend_Walking::CheckDeflection
     if(!prevpointistangent){
       prevTg = previousP.TangentOnS1();
     }
-    tolu = TheSurfaceTool::UResolution(surf1,tolesp);
-    tolv = TheSurfaceTool::VResolution(surf1,tolesp);
+    tolu = TheSurfaceTool::UResolution(surf1,tolpoint3d);
+    tolv = TheSurfaceTool::VResolution(surf1,tolpoint3d);
   }
   else {
     Psurf = CurPoint.PointOnS2();
@@ -223,8 +223,8 @@ Blend_Status Blend_Walking::CheckDeflection
     if(!prevpointistangent){
       prevTg = previousP.TangentOnS2();
     }
-    tolu = TheSurfaceTool::UResolution(surf2,tolesp);
-    tolv = TheSurfaceTool::VResolution(surf2,tolesp);
+    tolu = TheSurfaceTool::UResolution(surf2,tolpoint3d);
+    tolv = TheSurfaceTool::VResolution(surf2,tolpoint3d);
   }
 
   gp_Vec Corde(prevP,Psurf);
@@ -233,12 +233,13 @@ Blend_Status Blend_Walking::CheckDeflection
   if(!prevpointistangent) prevNorme = prevTg.SquareMagnitude();
 
 
-  if (Norme <= tolesp*tolesp){
+  const Standard_Real toler3d = 0.01 * tolpoint3d;
+  if (Norme <= toler3d * toler3d){
     // il faudra peut etre  forcer meme point
     return Blend_SamePoints;
   }
   if(!prevpointistangent){
-    if(prevNorme <= tolesp*tolesp) {
+    if(prevNorme <= toler3d * toler3d) {
       return Blend_SamePoints;
     }
     Cosi = sens*Corde*prevTg;