0032666: Data Exchange - Cannot write STEP file from an XCAF document containing only triangulations in the faces

Added support of reading and writing of the triangulated_surface_set.
Prevented creation of tesselated geometry under the schemas different from AP242DIS.
test step_read corrected, switched parameter write.step.schema to AP242DIS in begin and back to AP214CD at the end

src/StepVisual/FILES

@@ -308,3 +308,5 @@ StepVisual_TessellatedWire.cxx
 StepVisual_TessellatedWire.hxx
 StepVisual_TriangulatedFace.cxx
 StepVisual_TriangulatedFace.hxx
+StepVisual_TriangulatedSurfaceSet.cxx
+StepVisual_TriangulatedSurfaceSet.hxx

src/StepVisual/StepVisual_TriangulatedFace.cxx

@@ -23,7 +23,8 @@ IMPLEMENT_STANDARD_RTTIEXT(StepVisual_TriangulatedFace, StepVisual_TessellatedFa
 //purpose  : 
 //=======================================================================
 
-StepVisual_TriangulatedFace::StepVisual_TriangulatedFace ()
+StepVisual_TriangulatedFace::StepVisual_TriangulatedFace()
+  : StepVisual_TessellatedFace()
 {
 }
 

src/StepVisual/StepVisual_TriangulatedFace.hxx

@@ -32,7 +32,7 @@ class StepVisual_TriangulatedFace : public StepVisual_TessellatedFace
 
 public :
 
-  //! default constructor
+  //! Default constructor
   Standard_EXPORT StepVisual_TriangulatedFace();
 
   //! Initialize all fields (own and inherited)

src/StepVisual/StepVisual_TriangulatedSurfaceSet.cxx

@@ -0,0 +1,78 @@
+// Copyright (c) Open CASCADE 2023
+//
+// 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 <StepVisual_TriangulatedSurfaceSet.hxx>
+
+IMPLEMENT_STANDARD_RTTIEXT(StepVisual_TriangulatedSurfaceSet, StepVisual_TessellatedSurfaceSet)
+
+//=======================================================================
+//function : StepVisual_TriangulatedSurfaceSet
+//purpose  :
+//=======================================================================
+StepVisual_TriangulatedSurfaceSet::StepVisual_TriangulatedSurfaceSet()
+{
+}
+
+//=======================================================================
+//function : Init
+//purpose  :
+//=======================================================================
+void StepVisual_TriangulatedSurfaceSet::Init(const Handle(TCollection_HAsciiString)& theRepresentationItemName,
+                                             const Handle(StepVisual_CoordinatesList)& theTessellatedSurfaceSetCoordinates,
+                                             const Standard_Integer theTessellatedSurfaceSetPnmax,
+                                             const Handle(TColStd_HArray2OfReal)& theTessellatedSurfaceSetNormals,
+                                             const Handle(TColStd_HArray1OfInteger)& thePnindex,
+                                             const Handle(TColStd_HArray2OfInteger)& theTriangles)
+{
+  StepVisual_TessellatedSurfaceSet::Init(theRepresentationItemName,
+                                         theTessellatedSurfaceSetCoordinates,
+                                         theTessellatedSurfaceSetPnmax,
+                                         theTessellatedSurfaceSetNormals);
+  myPnindex = thePnindex;
+  myTriangles = theTriangles;
+}
+
+//=======================================================================
+//function : NbPnindex
+//purpose  :
+//=======================================================================
+Standard_Integer StepVisual_TriangulatedSurfaceSet::NbPnindex() const
+{
+  if (myPnindex.IsNull())
+  {
+    return 0;
+  }
+  return myPnindex->Length();
+}
+
+//=======================================================================
+//function : PnindexValue
+//purpose  :
+//=======================================================================
+Standard_Integer StepVisual_TriangulatedSurfaceSet::PnindexValue(const Standard_Integer theNum) const
+{
+  return myPnindex->Value(theNum);
+}
+
+//=======================================================================
+//function : NbTriangles
+//purpose  :
+//=======================================================================
+Standard_Integer StepVisual_TriangulatedSurfaceSet::NbTriangles() const
+{
+  if (myTriangles.IsNull())
+  {
+    return 0;
+  }
+  return myTriangles->ColLength();
+}

src/StepVisual/StepVisual_TriangulatedSurfaceSet.hxx

@@ -0,0 +1,70 @@
+// Copyright (c) Open CASCADE 2023
+//
+// 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 _StepVisual_TriangulatedSurfaceSet_HeaderFile_
+#define _StepVisual_TriangulatedSurfaceSet_HeaderFile_
+
+#include <Standard.hxx>
+#include <StepVisual_TessellatedSurfaceSet.hxx>
+
+#include <TColStd_HArray1OfInteger.hxx>
+#include <TColStd_HArray2OfInteger.hxx>
+
+//! Representation of STEP entity TriangulatedSurfaceSet
+class StepVisual_TriangulatedSurfaceSet : public StepVisual_TessellatedSurfaceSet
+{
+public:
+  //! default constructor
+  Standard_EXPORT StepVisual_TriangulatedSurfaceSet();
+
+  //! Initialize all fields (own and inherited)
+  Standard_EXPORT void Init(const Handle(TCollection_HAsciiString)& theRepresentationItemName,
+                            const Handle(StepVisual_CoordinatesList)& theTessellatedFaceCoordinates,
+                            const Standard_Integer theTessellatedFacePnmax,
+                            const Handle(TColStd_HArray2OfReal)& theTessellatedFaceNormals,
+                            const Handle(TColStd_HArray1OfInteger)& thePnindex,
+                            const Handle(TColStd_HArray2OfInteger)& theTriangles);
+
+  //! Returns field Pnindex
+  const Handle(TColStd_HArray1OfInteger) Pnindex() const { return myPnindex; }
+
+  //! Sets field Pnindex
+  void SetPnindex(const Handle(TColStd_HArray1OfInteger)& thePnindex) { myPnindex = thePnindex; }
+
+  //! Returns number of Pnindex
+  Standard_EXPORT Standard_Integer NbPnindex() const;
+
+  //! Returns value of Pnindex by its num
+  Standard_EXPORT Standard_Integer PnindexValue(const Standard_Integer theNum) const;
+
+  //! Returns field Triangles
+  const Handle(TColStd_HArray2OfInteger) Triangles() const { return myTriangles; }
+
+  //! Sets field Triangles
+  void SetTriangles(const Handle(TColStd_HArray2OfInteger)& theTriangles)
+  {
+    myTriangles = theTriangles; 
+  }
+
+  //! Returns number of Triangles
+  Standard_EXPORT Standard_Integer NbTriangles() const;
+
+  DEFINE_STANDARD_RTTIEXT(StepVisual_TriangulatedSurfaceSet, StepVisual_TessellatedSurfaceSet)
+
+private:
+
+  Handle(TColStd_HArray1OfInteger) myPnindex;
+  Handle(TColStd_HArray2OfInteger) myTriangles;
+};
+
+#endif // _StepVisual_TriangulatedSurfaceSet_HeaderFile_