0027122: Data Exchange - invalid shapes are produced during model translation due to huge face tolerance

Problem: The shape has two faces that dimensions are less than tolerance in the specified STEP file. This situation produces the invalid shape.
Change: Shape process has operator FixFaceSize, that is exactly suitable for this shape. The only option of FixFaceSize operator was added to InterfaceStatic, to manage the operator from DRAW command.
Result: The shape without artifacts can be reproduced from STEP file with an extra healing procedure.

src/STEPControl/STEPControl_Controller.cxx

@@ -239,6 +239,7 @@ STEPControl_Controller::STEPControl_Controller ()
     Interface_Static::Init ("XSTEP", "FromSTEP.FixShape.FixNonAdjacentIntersectingEdgesMode", 't', "-1");
     Interface_Static::Init ("XSTEP", "FromSTEP.FixShape.FixVertexPositionMode",       't', "0");
     Interface_Static::Init ("XSTEP", "FromSTEP.FixShape.FixVertexToleranceMode",      't', "-1"); 
+    Interface_Static::Init ("XSTEP", "FromSTEP.FixFaceSize.Tolerance",                't', "1.e-7"); 
 
     // ika 28.07.16: Parameter to read all top level solids and shells,
     // should be used only in case of invalid shape_representation without links to shapes.

tests/bugs/step/bug27122

@@ -0,0 +1,27 @@
+puts "================"
+puts "OCC27122"
+puts "================"
+puts ""
+#####################################################################
+# STEP import regression: invalid shapes are produced during model translation due to huge face tolerance
+#####################################################################
+
+pload XDE
+
+# Empty resource file name to take params from InterfaceStatic
+param "read.step.resource.name" "\"\""
+# Add FixFaceSize operator
+param "FromSTEP.exec.op" FixShape,FixFaceSize
+# Set a tolerance exceeding the size of the problem face to FixFaceSize operator
+param "FromSTEP.FixFaceSize.Tolerance" 0.0508
+
+stepread [locate_data_file bug27122_280696.stp] a *
+
+# restore old params
+param "read.step.resource.name" STEP
+param "FromSTEP.exec.op" FixShape
+param "FromSTEP.FixFaceSize.Tolerance" 1.e-7
+
+checknbshapes a_1 -t -face 10
+
+checkview -display a_1 -3d -path ${imagedir}/${test_image}.png

upgrade.bat

@@ -1,5 +1,5 @@
 @echo off
-rem test1
+
 rem Helper script to run procedure of automatic upgrade of application code
 rem on newer version of OCCT on Windows.
 rem Running it requires that Tcl should be in the PATH