0020676: EDF 1212 GEOM: Partition operation creates vertices which causes mesh computation to fail with netgen

* Solve problem with internal edges and faces

src/NETGENPlugin/NETGENPlugin_Mesher.hxx

@@ -30,8 +30,15 @@
 
 #include "NETGENPlugin_Defs.hxx"
 #include "StdMeshers_FaceSide.hxx"
+#include "SMDS_MeshElement.hxx"
+
+namespace nglib {
+#include <nglib.h>
+}
+
 #include <map>
 #include <vector>
+#include <set>
 
 class SMESH_Mesh;
 class SMESH_Comment;
@@ -40,6 +47,7 @@ class TopoDS_Shape;
 class TopTools_DataMapOfShapeShape;
 class NETGENPlugin_Hypothesis;
 class NETGENPlugin_SimpleHypothesis_2D;
+class NETGENPlugin_Internals;
 namespace netgen {
   class OCCGeometry;
   class Mesh;
@@ -81,19 +89,20 @@ class NETGENPLUGIN_EXPORT NETGENPlugin_Mesher
                                  const TopoDS_Shape&           shape,
                                  SMESH_Mesh&                   mesh,
                                  std::list< SMESH_subMesh* > * meshedSM=0,
-                                 TopTools_DataMapOfShapeShape* internalE2F=0);
+                                 NETGENPlugin_Internals*       internalShapes=0);
 
   static int FillSMesh(const netgen::OCCGeometry&          occgeom,
                        const netgen::Mesh&                 ngMesh,
                        const NETGENPlugin_ngMeshInfo&      initState,
                        SMESH_Mesh&                         sMesh,
-                       std::vector<SMDS_MeshNode*>&        nodeVec,
+                       std::vector<const SMDS_MeshNode*>&  nodeVec,
                        SMESH_Comment&                      comment);
 
   bool fillNgMesh(netgen::OCCGeometry&                occgeom,
                   netgen::Mesh&                       ngMesh,
-                  std::vector<SMDS_MeshNode*>&        nodeVec,
+                  std::vector<const SMDS_MeshNode*>&  nodeVec,
-                  const std::list< SMESH_subMesh* > & meshedSM);
+                  const std::list< SMESH_subMesh* > & meshedSM,
+                  NETGENPlugin_Internals*             internalShapes=0);
 
   void defaultParameters();
 
@@ -111,4 +120,72 @@ class NETGENPLUGIN_EXPORT NETGENPlugin_Mesher
   std::map< int, std::pair<int,int> >      _faceDescriptors;
 };
 
+//=============================================================================
+/*!
+ * \brief Container of info needed to solve problems with internal shapes.
+ *
+ * Issue 0020676. It is made up as a class to be ready to extract from NETGEN
+ * and put in SMESH as soon as the same solution is needed somewhere else.
+ * The approach is to precompute internal edges in 2D and internal faces in 3D
+ * and put their mesh correctly (twice) into netgen mesh.
+ * In 2D, this class finds internal edges in faces and their vertices.
+ * In 3D, it additionally finds internal faces, their edges shared with other faces,
+ * and their vertices shared by several internal edges. Nodes built on the found
+ * shapes and mesh faces built on the found internal faces are to be doubled in
+ * netgen mesh to emulate a "crack"
+ */
+//=============================================================================
+
+class NETGENPLUGIN_EXPORT NETGENPlugin_Internals
+{
+  SMESH_Mesh&       _mesh;
+  bool              _is3D;
+  //2D
+  std::map<int,int> _ev2face; //!< edges and vertices in faces where they are TopAbs_INTERNAL
+  // 3D
+  std::set<int>     _intShapes;
+  std::set<int>     _borderFaces; //!< non-intrnal faces sharing the internal edge
+
+public:
+  NETGENPlugin_Internals( SMESH_Mesh& mesh, const TopoDS_Shape& shape, bool is3D );
+
+  bool isShapeToPrecompute(const TopoDS_Shape& s);
+
+  // 2D
+  bool hasInternalEdges() const { return !_ev2face.empty(); }
+  bool isInternalEdge(int id ) const { return _ev2face.count( id ); }
+  bool isInternalVertex(int id ) const { return _ev2face.count( id ); }
+  const std::map<int,int>& getEdgesAndVerticesWithFaces() const { return _ev2face; }
+  void getInternalEdges( TopTools_IndexedMapOfShape& fmap,
+                         TopTools_IndexedMapOfShape& emap,
+                         TopTools_IndexedMapOfShape& vmap,
+                         list< SMESH_subMesh* >& smToPrecompute);
+
+  // 3D
+  bool hasInternalFaces() const { return !_intShapes.empty(); }
+  bool isInternalShape(int id ) const { return _intShapes.count( id ); }
+  void findBorderElements( std::set< const SMDS_MeshElement*, TIDCompare > & borderElems );
+  bool isBorderFace(int faceID ) const { return _borderFaces.count( faceID ); }
+  void getInternalFaces( TopTools_IndexedMapOfShape& fmap,
+                         TopTools_IndexedMapOfShape& emap,
+                         list< SMESH_subMesh* >&     facesSM,
+                         list< SMESH_subMesh* >&     boundarySM);
+
+};
+
+//================================================================================
+/*!
+ * \brief It correctly initializes netgen library at constructor and
+ *        correctly finishes using netgen library at destructor
+ */
+//================================================================================
+
+struct NETGENPLUGIN_EXPORT NETGENPlugin_NetgenLibWrapper
+{
+  nglib::Ng_Mesh * _ngMesh;
+  NETGENPlugin_NetgenLibWrapper();
+  ~NETGENPlugin_NetgenLibWrapper();
+  void setMesh( nglib::Ng_Mesh* mesh );
+};
+
 #endif

src/NETGENPlugin/NETGENPlugin_NETGEN_2D_ONLY.cxx

@@ -174,6 +174,7 @@ static TError AddSegmentsToMesh(netgen::Mesh&                    ngMesh,
   // Check wires and count nodes
   // ----------------------------
   int nbNodes = 0;
+  double totalLength = 0;
   for ( int iW = 0; iW < wires.size(); ++iW )
   {
     StdMeshers_FaceSidePtr wire = wires[ iW ];
@@ -188,6 +189,7 @@ static TError AddSegmentsToMesh(netgen::Mesh&                    ngMesh,
                                 SMESH_Comment("Unexpected nb of points on wire ") << iW
                                 << ": " << uvPtVec.size()<<" != "<<wire->NbPoints()));
     nbNodes += wire->NbPoints();
+    totalLength += wire->Length();
   }
   nodeVec.reserve( nbNodes );
 
@@ -200,6 +202,7 @@ static TError AddSegmentsToMesh(netgen::Mesh&                    ngMesh,
 //   ngMesh.SetLocalH (bb.PMin(), bb.PMax(), 0.5); // set grading
 
   const int faceID = 1, solidID = 0;
+  if ( ngMesh.GetNFD() < 1 )
     ngMesh.AddFaceDescriptor (FaceDescriptor(faceID, solidID, solidID, 0));
 
   for ( int iW = 0; iW < wires.size(); ++iW )
@@ -313,6 +316,70 @@ static TError AddSegmentsToMesh(netgen::Mesh&                    ngMesh,
 
   } // loop on wires of a face
 
+  // add a segment instead of internal vertex
+  // const TopoDS_Face& face = TopoDS::Face( helper.GetSubShape() );
+//   for ( TopoDS_Iterator sh (face); sh.More(); sh.Next())
+//   {
+//     if ( sh.Value().ShapeType() != TopAbs_VERTEX ) continue;
+
+//     const TopoDS_Vertex V = TopoDS::Vertex( sh.Value() );
+//     SMESH_subMesh* sm = helper.GetMesh()->GetSubMesh( V );
+//     sm->ComputeStateEngine( SMESH_subMesh::COMPUTE );
+//     const SMDS_MeshNode * nV = SMESH_Algo::VertexNode( V, helper.GetMeshDS() );
+//     if ( !nV ) continue;
+//     double segLen = totalLength / ngMesh.GetNSeg() / 2;
+//     bool uvOK = false;
+//     gp_XY uvV = helper.GetNodeUV( face, nV, 0, &uvOK );
+//     if ( !uvOK ) helper.CheckNodeUV( face, nV, uvV, BRep_Tool::Tolerance( V ),/*force=*/true);
+//     gp_XY uvP( uvV.X() + segLen, uvV.Y() );
+//     TopLoc_Location loc;
+//     Handle(Geom_Surface) surf = BRep_Tool::Surface(face,loc);
+//     gp_Pnt P = surf->Value( uvP.X(), uvP.Y() ).Transformed( loc );
+
+//     MeshPoint mpV( Point<3> (nV->X(), nV->Y(), nV->Z()) );
+//     MeshPoint mpP( Point<3> (P.X(), P.Y(), P.Z()));
+
+//     ngMesh.AddPoint ( mpV, 1, EDGEPOINT );
+//     ngMesh.AddPoint ( mpP, 1, EDGEPOINT );
+
+//     nodeVec.push_back( nV );
+
+//     // Add the segment
+//     Segment seg;
+
+// #ifdef NETGEN_NEW
+//     seg.pnums[0] = ngMesh.GetNP()-1;  // ng node id
+//     seg.pnums[1] = ngMesh.GetNP();  // ng node id
+// #else
+//     seg.p1 = ngMesh.GetNP()-1;  // ng node id
+//     seg.p2 = ngMesh.GetNP(); // ng node id
+// #endif
+//     seg.edgenr = ngMesh.GetNSeg() + 1;// segment id
+//     seg.si = faceID;                  // = geom.fmap.FindIndex (face);
+
+//     seg.epgeominfo[ 0 ].dist = 0; // param on curve
+//     seg.epgeominfo[ 0 ].u    = uvV.X();
+//     seg.epgeominfo[ 0 ].v    = uvV.Y();
+//     seg.epgeominfo[ 1 ].dist = segLen; // param on curve
+//     seg.epgeominfo[ 1 ].u    = uvP.X();
+//     seg.epgeominfo[ 1 ].v    = uvP.Y();
+
+//     seg.epgeominfo[ 0 ].edgenr = 10; //  = geom.emap.FindIndex(edge);
+//     seg.epgeominfo[ 1 ].edgenr = 10; //  = geom.emap.FindIndex(edge);
+
+//     ngMesh.AddSegment (seg);
+
+//     // add reverse segment
+// #ifdef NETGEN_NEW
+//     swap (seg.pnums[0], seg.pnums[1]);
+// #else
+//     swap (seg.p1, seg.p2);
+// #endif
+//     swap( seg.epgeominfo[0], seg.epgeominfo[1] );
+//     seg.edgenr = ngMesh.GetNSeg() + 1; // segment id
+//     ngMesh.AddSegment (seg);
+//   }
+
   ngMesh.CalcSurfacesOfNode();
 
   return TError();
@@ -356,8 +423,8 @@ bool NETGENPlugin_NETGEN_2D_ONLY::Compute(SMESH_Mesh&         aMesh,
   // Make input netgen mesh
   // -------------------------
 
-  Ng_Init();
+  NETGENPlugin_NetgenLibWrapper ngLib;
-  netgen::Mesh * ngMesh = new netgen::Mesh ();
+  netgen::Mesh * ngMesh = (netgen::Mesh*) ngLib._ngMesh;
 
   netgen::OCCGeometry occgeo;
   NETGENPlugin_Mesher::PrepareOCCgeometry( occgeo, F, aMesh );
@@ -366,10 +433,8 @@ bool NETGENPlugin_NETGEN_2D_ONLY::Compute(SMESH_Mesh&         aMesh,
 
   vector< const SMDS_MeshNode* > nodeVec;
   problem = AddSegmentsToMesh( *ngMesh, occgeo, wires, helper, nodeVec );
-  if ( problem && !problem->IsOK() ) {
+  if ( problem && !problem->IsOK() )
-    delete ngMesh; Ng_Exit();
     return error( problem );
-  }
 
   // --------------------
   // compute edge length
@@ -480,11 +545,6 @@ bool NETGENPlugin_NETGEN_2D_ONLY::Compute(SMESH_Mesh&         aMesh,
       face = helper.AddFace(nodes[0],nodes[1],nodes[2],nodes[3]);
   }
 
-  Ng_DeleteMesh((nglib::Ng_Mesh*)ngMesh);
-  Ng_Exit();
-
-  NETGENPlugin_Mesher::RemoveTmpFiles();
-
   return !err;
 }
 

src/NETGENPlugin/NETGENPlugin_NETGEN_2D_ONLY.hxx

@@ -29,25 +29,9 @@
 #include "SMESH_2D_Algo.hxx"
 #include "SMESH_Mesh.hxx"
 
-/*#define OCCGEOMETRY
-#include <occgeom.hpp>
-#include <meshing.hpp>//amv*/
-
 class StdMeshers_MaxElementArea;
 class StdMeshers_LengthFromEdges;
 class StdMeshers_QuadranglePreference;
-//class NETGENPlugin_Hypothesis;
-
-/*namespace netgen {
-  class OCCGeometry;
-}*/
-/*namespace netgen {
-  class OCCGeometry;
-  extern int OCCGenerateMesh (OCCGeometry&, Mesh*&, int, int, char*);
-  extern MeshingParameters mparam;
-}*/
-
-//using namespace netgen;
 
 /*!
  * \brief Mesher generating 2D elements on a geometrical face taking

src/NETGENPlugin/NETGENPlugin_NETGEN_3D.cxx

@@ -151,158 +151,6 @@ bool NETGENPlugin_NETGEN_3D::CheckHypothesis
   return isOk;
 }
 
-namespace
-{
-  //================================================================================
-  /*!
-   * \brief It correctly initializes netgen library at constructor and
-   *        correctly finishes using netgen library at destructor
-   */
-  //================================================================================
-
-  struct TNetgenLibWrapper
-  {
-    Ng_Mesh* _ngMesh;
-    TNetgenLibWrapper()
-    {
-      Ng_Init();
-      _ngMesh = Ng_NewMesh();
-    }
-    ~TNetgenLibWrapper()
-    {
-      Ng_DeleteMesh( _ngMesh );
-      Ng_Exit();
-      NETGENPlugin_Mesher::RemoveTmpFiles();
-    }
-  };
-
-  //================================================================================
-  /*!
-   * \brief Find mesh faces on non-internal geom faces sharing internal edge
-   *        some nodes of which are to be doubled to make the second border of the "crack"
-   */
-  //================================================================================
-
-  void findBorders( const set<int>&     internalShapeIds,
-                    SMESH_MesherHelper& helper,
-                    TIDSortedElemSet &  borderElems,
-                    set<int> &          borderFaceIds )
-  {
-    SMESH_Mesh*     mesh = helper.GetMesh();
-    SMESHDS_Mesh* meshDS = helper.GetMeshDS();
-
-    // loop on internal geom edges
-    set<int>::const_iterator intShapeId = internalShapeIds.begin();
-    for ( ; intShapeId != internalShapeIds.end(); ++intShapeId )
-    {
-      const TopoDS_Shape& s = meshDS->IndexToShape( *intShapeId );
-      if ( s.ShapeType() != TopAbs_EDGE ) continue;
-
-      // get internal and non-internal geom faces sharing the internal edge <s>
-      int intFace = 0;
-      set<int>::iterator bordFace = borderFaceIds.end();
-      TopTools_ListIteratorOfListOfShape ancIt( mesh->GetAncestors( s ));
-      for ( ; ancIt.More(); ancIt.Next() )
-      {
-        if ( ancIt.Value().ShapeType() != TopAbs_FACE ) continue;
-        int faceID = meshDS->ShapeToIndex( ancIt.Value() );
-        if ( internalShapeIds.count( faceID ))
-          intFace = faceID;
-        else
-          bordFace = borderFaceIds.insert( faceID ).first;
-      }
-      if ( bordFace == borderFaceIds.end() || !intFace ) continue;
-
-      // get all links of mesh faces on internal geom face sharing nodes on edge <s>
-      set< SMESH_OrientedLink > links; //!< links of faces on internal geom face
-      TIDSortedElemSet suspectFaces;   //!< mesh faces on border geom faces
-      SMESHDS_SubMesh* intFaceSM = meshDS->MeshElements( intFace );
-      if ( !intFaceSM || intFaceSM->NbElements() == 0 ) continue;
-      SMESH_subMeshIteratorPtr smIt = mesh->GetSubMesh( s )->getDependsOnIterator(true,true);
-      while ( smIt->more() )
-      {
-        SMESHDS_SubMesh* sm = smIt->next()->GetSubMeshDS();
-        if ( !sm ) continue;
-        SMDS_NodeIteratorPtr nIt = sm->GetNodes();
-        while ( nIt->more() )
-        {
-          const SMDS_MeshNode* nOnEdge = nIt->next();
-          SMDS_ElemIteratorPtr fIt = nOnEdge->GetInverseElementIterator(SMDSAbs_Face);
-          while ( fIt->more() )
-          {
-            const SMDS_MeshElement* f = fIt->next();
-            if ( intFaceSM->Contains( f ))
-            {
-              int nbNodes = f->NbNodes() / ( f->IsQuadratic() ? 2 : 1 );
-              for ( int i = 0; i < nbNodes; ++i )
-                links.insert( SMESH_OrientedLink( f->GetNode(i), f->GetNode((i+1)%nbNodes)));
-            }
-            else
-            {
-              suspectFaces.insert( f );
-            }
-          }
-        }
-      }
-      // <suspectFaces> having link with same orientation as mesh faces on
-      // the internal geom face are <borderElems>.
-      // Some of them have only one node on edge s, we collect them to decide
-      // later by links of found <borderElems>
-      TIDSortedElemSet posponedFaces;
-      set< SMESH_OrientedLink > borderLinks;
-      TIDSortedElemSet::iterator fIt = suspectFaces.begin();
-      for ( ; fIt != suspectFaces.end(); ++fIt )
-      {
-        const SMDS_MeshElement* f = *fIt;
-        bool linkFound = false, isBorder = false;
-        list< SMESH_OrientedLink > faceLinks;
-        int nbNodes = f->NbNodes() / ( f->IsQuadratic() ? 2 : 1 );
-        for ( int i = 0; i < nbNodes; ++i )
-        {
-          SMESH_OrientedLink link( f->GetNode(i), f->GetNode((i+1)%nbNodes));
-          faceLinks.push_back( link );
-          if ( !linkFound )
-          {
-            set< SMESH_OrientedLink >::iterator foundLink = links.find( link );
-            if ( foundLink != links.end() )
-            {
-              linkFound= true;
-              isBorder = ( foundLink->_reversed == link._reversed );
-              if ( !isBorder ) break;
-            }
-          }
-        }
-        if ( isBorder )
-        {
-          borderElems.insert( f );
-          borderLinks.insert( faceLinks.begin(), faceLinks.end() );
-        }
-        else if ( !linkFound )
-        {
-          posponedFaces.insert( f );
-        }
-      }
-      // decide on posponedFaces
-      for ( fIt = posponedFaces.begin(); fIt != posponedFaces.end(); ++fIt )
-      {
-        const SMDS_MeshElement* f = *fIt;
-        int nbNodes = f->NbNodes() / ( f->IsQuadratic() ? 2 : 1 );
-        for ( int i = 0; i < nbNodes; ++i )
-        {
-          SMESH_OrientedLink link( f->GetNode(i), f->GetNode((i+1)%nbNodes));
-          set< SMESH_OrientedLink >::iterator foundLink = borderLinks.find( link );
-          if ( foundLink != borderLinks.end() )
-          {
-            if ( foundLink->_reversed != link._reversed )
-              borderElems.insert( f );
-            break;
-          }
-        }
-      }
-    }
-  }
-}
-
 //=============================================================================
 /*!
  *Here we are going to use the NETGEN mesher
@@ -328,7 +176,7 @@ bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh&         aMesh,
   int Netgen_triangle[3];
   int Netgen_tetrahedron[4];
 
-  TNetgenLibWrapper ngLib;
+  NETGENPlugin_NetgenLibWrapper ngLib;
   Ng_Mesh * Netgen_mesh = ngLib._ngMesh;
 
   // maps of 1) ordinary nodes and 2) doubled nodes on internal shapes
@@ -342,60 +190,17 @@ bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh&         aMesh,
     SMESH::Controls::Area areaControl;
     SMESH::Controls::TSequenceOfXYZ nodesCoords;
 
-    // --------------------------------------------------------------------
     // Issue 0020676 (StudyFiss_bugNetgen3D.hdf). Pb with internal face.
     // Find internal geom faces, edges and vertices. 
     // Nodes and faces built on the found internal shapes
     // will be doubled in Netgen input to make two borders of the "crack".
-    // --------------------------------------------------------------------
 
-    set<int> internalShapeIds;
+    NETGENPlugin_Internals internals( aMesh, aShape, /*is3D=*/true );
-    set<int> borderFaceIds; //!< non-internal geom faces sharing internal edge
 
-    // mesh faces on <borderFaceIds>, having nodes on internal edge that are
+    // mesh faces on non-internal geom faces sharing internal edge, whose some nodes
-    // to be replaced by doubled nodes
+    // are on internal edge and are to be replaced by doubled nodes
     TIDSortedElemSet borderElems;
-
+    internals.findBorderElements( borderElems );
-    // find "internal" faces and edges
-    TopExp_Explorer exFa(aShape,TopAbs_FACE), exEd, exVe;
-    for ( ; exFa.More(); exFa.Next())
-    {
-      if ( exFa.Current().Orientation() == TopAbs_INTERNAL )
-      {
-        internalShapeIds.insert( meshDS->ShapeToIndex( exFa.Current() ));
-        for ( exEd.Init( exFa.Current(), TopAbs_EDGE ); exEd.More(); exEd.Next())
-          if ( helper.NbAncestors( exEd.Current(), aMesh, TopAbs_FACE ) > 1 )
-            internalShapeIds.insert( meshDS->ShapeToIndex( exEd.Current() ));
-      }
-    }
-    if ( !internalShapeIds.empty() )
-    {
-      // find internal vertices,
-      // we consider vertex internal if it is shared by more than one internal edge
-      TopTools_ListIteratorOfListOfShape ancIt;
-      set<int>::iterator intShapeId = internalShapeIds.begin();
-      for ( ; intShapeId != internalShapeIds.end(); ++intShapeId )
-      {
-        const TopoDS_Shape& s = meshDS->IndexToShape( *intShapeId );
-        if ( s.ShapeType() != TopAbs_EDGE ) continue;
-        for ( exVe.Init( s, TopAbs_VERTEX ); exVe.More(); exVe.Next())
-        {
-          set<int> internalEdges;
-          for ( ancIt.Initialize( aMesh.GetAncestors( exVe.Current() ));
-                ancIt.More(); ancIt.Next() )
-          {
-            if ( ancIt.Value().ShapeType() != TopAbs_EDGE ) continue;
-            int edgeID = meshDS->ShapeToIndex( ancIt.Value() );
-            if ( internalShapeIds.count( edgeID ))
-              internalEdges.insert( edgeID );
-          }
-          if ( internalEdges.size() > 1 )
-            internalShapeIds.insert( meshDS->ShapeToIndex( exVe.Current() ));
-        }
-      }
-      // find border shapes and mesh elements
-      findBorders( internalShapeIds, helper, borderElems, borderFaceIds );
-    }
 
     // ---------------------------------
     // Feed the Netgen with surface mesh
@@ -408,12 +213,12 @@ bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh&         aMesh,
     if ( aMesh.NbQuadrangles() > 0 )
       Adaptor.Compute(aMesh,aShape);
 
-    for ( exFa.ReInit(); exFa.More(); exFa.Next())
+    for ( TopExp_Explorer exFa( aShape, TopAbs_FACE ); exFa.More(); exFa.Next())
     {
       const TopoDS_Shape& aShapeFace = exFa.Current();
       int faceID = meshDS->ShapeToIndex( aShapeFace );
-      bool isInternalFace = internalShapeIds.count( faceID );
+      bool isInternalFace = internals.isInternalShape( faceID );
-      bool isBorderFace   = borderFaceIds.count( faceID );
+      bool isBorderFace   = internals.isBorderFace( faceID );
       bool isRev = false;
       if ( checkReverse && !isInternalFace &&
            helper.NbAncestors(aShapeFace, aMesh, aShape.ShapeType()) > 1 )
@@ -471,7 +276,7 @@ bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh&         aMesh,
                 node = SMESH_Algo::VertexNode( TopoDS::Vertex( vertex ), meshDS );
                 hasDegen = true;
               }
-              bool isDblN = isDblF && internalShapeIds.count( shapeID );
+              bool isDblN = isDblF && internals.isInternalShape( shapeID );
               int& ngID = nodeToNetgenID[isDblN].insert(TN2ID( node, invalid_ID )).first->second;
               if ( ngID == invalid_ID )
               {
@@ -681,7 +486,7 @@ bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh&         aMesh,
   int Netgen_triangle[3];
   int Netgen_tetrahedron[4];
 
-  TNetgenLibWrapper ngLib;
+  NETGENPlugin_NetgenLibWrapper ngLib;
   Ng_Mesh * Netgen_mesh = ngLib._ngMesh;
 
   // set nodes and remember thier netgen IDs