From b9f21bee943820df03ac5e4b92d4adca9c567323 Mon Sep 17 00:00:00 2001
From: anv <anv@opencascade.com>
Date: Mon, 21 Sep 2015 15:58:53 +0300
Subject: [PATCH] 0026522: Exception while copying offset on C0 surface

---
 src/Geom/Geom_OffsetSurface.cxx        |  2 +-
 src/GeomTools/GeomTools_SurfaceSet.cxx |  2 +-
 tests/bugs/moddata_3/bug26522          | 17 +++++++++++++++++
 3 files changed, 19 insertions(+), 2 deletions(-)
 create mode 100644 tests/bugs/moddata_3/bug26522

diff --git a/src/Geom/Geom_OffsetSurface.cxx b/src/Geom/Geom_OffsetSurface.cxx
index 336b077ca4..cf107cb5cb 100644
--- a/src/Geom/Geom_OffsetSurface.cxx
+++ b/src/Geom/Geom_OffsetSurface.cxx
@@ -211,7 +211,7 @@ static void derivatives(Standard_Integer MaxOrder,
 Handle(Geom_Geometry) Geom_OffsetSurface::Copy () const {
 
   Handle(OffsetSurface) S;
-  S = new OffsetSurface (basisSurf, offsetValue);
+  S = new OffsetSurface (basisSurf, offsetValue, Standard_True);
   return S;
 }
 
diff --git a/src/GeomTools/GeomTools_SurfaceSet.cxx b/src/GeomTools/GeomTools_SurfaceSet.cxx
index adfe2b90cd..0e8513bd80 100644
--- a/src/GeomTools/GeomTools_SurfaceSet.cxx
+++ b/src/GeomTools/GeomTools_SurfaceSet.cxx
@@ -923,7 +923,7 @@ static Standard_IStream& operator>>(Standard_IStream& IS,
   GeomTools::GetReal(IS, O);
   Handle(Geom_Surface) BS;
   GeomTools_SurfaceSet::ReadSurface(IS,BS);
-  S = new Geom_OffsetSurface(BS,O);
+  S = new Geom_OffsetSurface(BS,O,Standard_True);
   return IS;
 }
 
diff --git a/tests/bugs/moddata_3/bug26522 b/tests/bugs/moddata_3/bug26522
new file mode 100644
index 0000000000..72ad047861
--- /dev/null
+++ b/tests/bugs/moddata_3/bug26522
@@ -0,0 +1,17 @@
+puts "================"
+puts "OCC26522"
+puts "================"
+puts ""
+#######################################################
+## Exception while copying offset on C0 surface
+#######################################################
+
+restore [locate_data_file bug26522_s.brep] s
+
+set info [checkshape s]
+
+if { [regexp "This shape seems to be valid" ${info}] == 1 } {
+    puts "OK: copying offset on C0 surface is correct"
+} else {
+    puts "Error: copying offset on C0 surface is incorrect"
+}