--- /dev/null
+// Copyright (C) 2007-2012 CEA/DEN, EDF R&D, OPEN CASCADE
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+//
+// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
+//
+
+#include "OCC2VTK_Tools.h"
+
+#include "GEOM_VertexSource.h"
+#include "GEOM_EdgeSource.h"
+#include "GEOM_WireframeFace.h"
+#include "GEOM_ShadingFace.h"
+
+#include <Bnd_Box.hxx>
+#include <BRep_Tool.hxx>
+#include <BRepTools.hxx>
+
+#include <BRepBndLib.hxx>
+#include <BRepMesh_IncrementalMesh.hxx>
+#include <Poly_Triangulation.hxx>
+#include <TopExp_Explorer.hxx>
+#include <TopoDS.hxx>
+#include <TopTools_ListOfShape.hxx>
+
+#define MAX2(X, Y) (Abs(X) > Abs(Y) ? Abs(X) : Abs(Y))
+#define MAX3(X, Y, Z) (MAX2(MAX2(X,Y), Z))
+
+
+#define DEFAULT_DEFLECTION 0.001
+
+namespace GEOM
+{
+ void MeshShape(const TopoDS_Shape theShape,
+ float& theDeflection,
+ bool theForced ) {
+
+ Standard_Real aDeflection = theDeflection <= 0 ? DEFAULT_DEFLECTION : theDeflection;
+
+ //If deflection <= 0, than return default deflection
+ if(theDeflection <= 0)
+ theDeflection = aDeflection;
+
+ // Is shape triangulated?
+ Standard_Boolean alreadymeshed = Standard_True;
+ TopExp_Explorer ex;
+ TopLoc_Location aLoc;
+ for (ex.Init(theShape, TopAbs_FACE); ex.More(); ex.Next()) {
+ const TopoDS_Face& aFace = TopoDS::Face(ex.Current());
+ Handle(Poly_Triangulation) aPoly = BRep_Tool::Triangulation(aFace,aLoc);
+ if(aPoly.IsNull()) {
+ alreadymeshed = Standard_False;
+ break;
+ }
+ }
+
+ if(!alreadymeshed || theForced) {
+ Bnd_Box B;
+ BRepBndLib::Add(theShape, B);
+ if ( B.IsVoid() )
+ return; // NPAL15983 (Bug when displaying empty groups)
+ Standard_Real aXmin, aYmin, aZmin, aXmax, aYmax, aZmax;
+ B.Get(aXmin, aYmin, aZmin, aXmax, aYmax, aZmax);
+
+ // This magic line comes from Prs3d_ShadedShape.gxx in OCCT
+ aDeflection = MAX3(aXmax-aXmin, aYmax-aYmin, aZmax-aZmin) * aDeflection * 4;
+
+ //Clean triangulation before compute incremental mesh
+ BRepTools::Clean(theShape);
+
+ //Compute triangulation
+ BRepMesh_IncrementalMesh MESH(theShape,aDeflection);
+ }
+ }
+
+ void SetShape(const TopoDS_Shape& theShape,
+ const TopTools_IndexedDataMapOfShapeListOfShape& theEdgeMap,
+ bool theIsVector,
+ GEOM_EdgeSource* theIsolatedEdgeSource,
+ GEOM_EdgeSource* theOneFaceEdgeSource,
+ GEOM_EdgeSource* theSharedEdgeSource,
+ GEOM_WireframeFace* theWireframeFaceSource,
+ GEOM_ShadingFace* theShadingFaceSource)
+ {
+ if (theShape.ShapeType() == TopAbs_COMPOUND) {
+ TopoDS_Iterator anItr(theShape);
+ for (; anItr.More(); anItr.Next()) {
+ SetShape(anItr.Value(),theEdgeMap,theIsVector,
+ theIsolatedEdgeSource,
+ theOneFaceEdgeSource,
+ theSharedEdgeSource,
+ theWireframeFaceSource,
+ theShadingFaceSource);
+ }
+ }
+
+ switch (theShape.ShapeType()) {
+ case TopAbs_WIRE: {
+ TopExp_Explorer anEdgeExp(theShape,TopAbs_EDGE);
+ for (; anEdgeExp.More(); anEdgeExp.Next()){
+ const TopoDS_Edge& anEdge = TopoDS::Edge(anEdgeExp.Current());
+ if (!BRep_Tool::Degenerated(anEdge))
+ theIsolatedEdgeSource->AddEdge(anEdge,theIsVector);
+ }
+ break;
+ }
+ case TopAbs_EDGE: {
+ const TopoDS_Edge& anEdge = TopoDS::Edge(theShape);
+ if (!BRep_Tool::Degenerated(anEdge))
+ theIsolatedEdgeSource->AddEdge(anEdge,theIsVector);
+ break;
+ }
+ case TopAbs_VERTEX: {
+ break;
+ }
+ default: {
+ TopExp_Explorer aFaceExp (theShape,TopAbs_FACE);
+ for(; aFaceExp.More(); aFaceExp.Next()) {
+ const TopoDS_Face& aFace = TopoDS::Face(aFaceExp.Current());
+ theWireframeFaceSource->AddFace(aFace);
+ theShadingFaceSource->AddFace(aFace);
+ TopExp_Explorer anEdgeExp(aFaceExp.Current(), TopAbs_EDGE);
+ for(; anEdgeExp.More(); anEdgeExp.Next()) {
+ const TopoDS_Edge& anEdge = TopoDS::Edge(anEdgeExp.Current());
+ if(!BRep_Tool::Degenerated(anEdge)){
+ // compute the number of faces
+ int aNbOfFaces = theEdgeMap.FindFromKey(anEdge).Extent();
+ switch(aNbOfFaces){
+ case 0: // isolated edge
+ theIsolatedEdgeSource->AddEdge(anEdge,theIsVector);
+ break;
+ case 1: // edge in only one face
+ theOneFaceEdgeSource->AddEdge(anEdge,theIsVector);
+ break;
+ default: // edge shared by at least two faces
+ theSharedEdgeSource->AddEdge(anEdge,theIsVector);
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+}
