Exemplo n.º 1
0
PyObject* FemMeshPy::getGroupElements(PyObject *args)
{
    int id;
    if (!PyArg_ParseTuple(args, "i", &id))
         return 0;

    std::set<int> ids;
    SMDS_ElemIteratorPtr aElemIter = getFemMeshPtr()->getSMesh()->GetGroup(id)->GetGroupDS()->GetElements();
    while (aElemIter->more()) {
        const SMDS_MeshElement* aElement = aElemIter->next();
        ids.insert(aElement->GetID());
    }

    Py::Tuple tuple(ids.size());
    int index = 0;
    for (std::set<int>::iterator it = ids.begin(); it != ids.end(); ++it) {
#if PY_MAJOR_VERSION >= 3
        tuple.setItem(index++, Py::Long(*it));
#else
        tuple.setItem(index++, Py::Int(*it));
#endif
    }

    return Py::new_reference_to(tuple);
}
Exemplo n.º 2
0
int SMESHDS_GroupBase::Extent() const
{
  SMDS_ElemIteratorPtr it = GetElements();
  int nb = 0;
  if ( it )
    for ( ; it->more(); it->next() ) 
      nb++;
  return nb;
}
Exemplo n.º 3
0
 _MyEdgeIterator(const SMDS_QuadraticFaceOfNodes* face):myIndex(0) {
     myElems.reserve( face->NbNodes() );
     SMDS_ElemIteratorPtr nIt = face->interlacedNodesElemIterator();
     const SMDS_MeshNode* n0 = face->GetNodeWrap( -1 );
     while ( nIt->more() ) {
         const SMDS_MeshNode* n1 = static_cast<const SMDS_MeshNode*>( nIt->next() );
         const SMDS_MeshElement* edge = SMDS_Mesh::FindEdge( n0, n1 );
         if ( edge )
             myElems.push_back( edge );
         n0 = n1;
     }
 }
Exemplo n.º 4
0
bool SMESH_Algo::GetSortedNodesOnEdge(const SMESHDS_Mesh*                   theMesh,
                                      const TopoDS_Edge&                    theEdge,
                                      const bool                            ignoreMediumNodes,
                                      map< double, const SMDS_MeshNode* > & theNodes)
{
  theNodes.clear();

  if ( !theMesh || theEdge.IsNull() )
    return false;

  SMESHDS_SubMesh * eSubMesh = theMesh->MeshElements( theEdge );
  if ( !eSubMesh || !eSubMesh->GetElements()->more() )
    return false; // edge is not meshed

  int nbNodes = 0;
  set < double > paramSet;
  if ( eSubMesh )
  {
    // loop on nodes of an edge: sort them by param on edge
    SMDS_NodeIteratorPtr nIt = eSubMesh->GetNodes();
    while ( nIt->more() )
    {
      const SMDS_MeshNode* node = nIt->next();
      if ( ignoreMediumNodes ) {
        SMDS_ElemIteratorPtr elemIt = node->GetInverseElementIterator();
        if ( elemIt->more() && elemIt->next()->IsMediumNode( node ))
          continue;
      }
      const SMDS_PositionPtr& pos = node->GetPosition();
      if ( pos->GetTypeOfPosition() != SMDS_TOP_EDGE )
        return false;
      const SMDS_EdgePosition* epos =
        static_cast<const SMDS_EdgePosition*>(node->GetPosition().get());
      theNodes.insert( make_pair( epos->GetUParameter(), node ));
      ++nbNodes;
    }
  }
  // add vertex nodes
  TopoDS_Vertex v1, v2;
  TopExp::Vertices(theEdge, v1, v2);
  const SMDS_MeshNode* n1 = VertexNode( v1, (SMESHDS_Mesh*) theMesh );
  const SMDS_MeshNode* n2 = VertexNode( v2, (SMESHDS_Mesh*) theMesh );
  Standard_Real f, l;
  BRep_Tool::Range(theEdge, f, l);
  if ( v1.Orientation() != TopAbs_FORWARD )
    std::swap( f, l );
  if ( n1 && ++nbNodes )
    theNodes.insert( make_pair( f, n1 ));
  if ( n2 && ++nbNodes )
    theNodes.insert( make_pair( l, n2 ));

  return theNodes.size() == nbNodes;
}
Exemplo n.º 5
0
  const SMDS_MeshElement* next()
  {
	if ( myType == SMDSAbs_Node && (myNodeIt!=NULL) )
      return myNodeIt->next();
    const SMDS_MeshElement* res = myElem;
    myElem = 0;
    while ( (myElemIt!=NULL) && myElemIt->more() ) {
      myElem = myElemIt->next();
      if ( myElem && myElem->GetType() == myType )
        break;
      else
        myElem = 0;
    }
  }
bool NETGENPlugin_Mesher::fillNgMesh(netgen::OCCGeometry&           occgeom,
                                     netgen::Mesh&                  ngMesh,
                                     vector<SMDS_MeshNode*>&        nodeVec,
                                     const list< SMESH_subMesh* > & meshedSM)
{
  TNode2IdMap nodeNgIdMap;

  TopTools_MapOfShape visitedShapes;

  SMESH_MesherHelper helper (*_mesh);

  int faceID = occgeom.fmap.Extent();
  _faceDescriptors.clear();

  list< SMESH_subMesh* >::const_iterator smIt, smEnd = meshedSM.end();
  for ( smIt = meshedSM.begin(); smIt != smEnd; ++smIt )
  {
    SMESH_subMesh* sm = *smIt;
    if ( !visitedShapes.Add( sm->GetSubShape() ))
      continue;

    SMESHDS_SubMesh * smDS = sm->GetSubMeshDS();

    switch ( sm->GetSubShape().ShapeType() )
    {
    case TopAbs_EDGE: { // EDGE
      // ----------------------
      const TopoDS_Edge& geomEdge  = TopoDS::Edge( sm->GetSubShape() );

      // Add ng segments for each not meshed face the edge bounds
      TopTools_MapOfShape visitedAncestors;
      const TopTools_ListOfShape& ancestors = _mesh->GetAncestors( geomEdge );
      TopTools_ListIteratorOfListOfShape ancestorIt ( ancestors );
      for ( ; ancestorIt.More(); ancestorIt.Next() )
      {
        const TopoDS_Shape & ans = ancestorIt.Value();
        if ( ans.ShapeType() != TopAbs_FACE || !visitedAncestors.Add( ans ))
          continue;
        const TopoDS_Face& face = TopoDS::Face( ans );

        int faceID = occgeom.fmap.FindIndex( face );
        if ( faceID < 1 )
          continue; // meshed face

        // find out orientation of geomEdge within face
        bool isForwad = false;
        for ( TopExp_Explorer exp( face, TopAbs_EDGE ); exp.More(); exp.Next() ) {
          if ( geomEdge.IsSame( exp.Current() )) {
            isForwad = ( exp.Current().Orientation() == geomEdge.Orientation() );
            break;
          }
        }
        bool isQuad = smDS->GetElements()->next()->IsQuadratic();

        // get all nodes from geomEdge
        StdMeshers_FaceSide fSide( face, geomEdge, _mesh, isForwad, isQuad );
        const vector<UVPtStruct>& points = fSide.GetUVPtStruct();
        int i, nbSeg = fSide.NbSegments();

        double otherSeamParam = 0;
        helper.SetSubShape( face );
        bool isSeam = helper.IsRealSeam( geomEdge );
        if ( isSeam )
          otherSeamParam =
            helper.GetOtherParam( helper.GetPeriodicIndex() == 1 ? points[0].u : points[0].v );

        // add segments

        int prevNgId = ngNodeId( points[0].node, ngMesh, nodeNgIdMap );

        for ( i = 0; i < nbSeg; ++i )
        {
          const UVPtStruct& p1 = points[ i ];
          const UVPtStruct& p2 = points[ i+1 ];

          netgen::Segment seg;
          // ng node ids
          seg.p1 = prevNgId;
          seg.p2 = prevNgId = ngNodeId( p2.node, ngMesh, nodeNgIdMap );
          // node param on curve
          seg.epgeominfo[ 0 ].dist = p1.param;
          seg.epgeominfo[ 1 ].dist = p2.param;
          // uv on face
          seg.epgeominfo[ 0 ].u = p1.u;
          seg.epgeominfo[ 0 ].v = p1.v;
          seg.epgeominfo[ 1 ].u = p2.u;
          seg.epgeominfo[ 1 ].v = p2.v;

          //seg.epgeominfo[ iEnd ].edgenr = edgeID; //  = geom.emap.FindIndex(edge);
          seg.si = faceID;                   // = geom.fmap.FindIndex (face);
          seg.edgenr = ngMesh.GetNSeg() + 1; // segment id
          ngMesh.AddSegment (seg);

          if ( isSeam )
          {
            if ( helper.GetPeriodicIndex() == 1 ) {
              seg.epgeominfo[ 0 ].u = otherSeamParam;
              seg.epgeominfo[ 1 ].u = otherSeamParam;
              swap (seg.epgeominfo[0].v, seg.epgeominfo[1].v);
            } else {
              seg.epgeominfo[ 0 ].v = otherSeamParam;
              seg.epgeominfo[ 1 ].v = otherSeamParam;
              swap (seg.epgeominfo[0].u, seg.epgeominfo[1].u);
            }
            swap (seg.p1, seg.p2);
            swap (seg.epgeominfo[0].dist, seg.epgeominfo[1].dist);
            seg.edgenr = ngMesh.GetNSeg() + 1; // segment id
            ngMesh.AddSegment (seg);
          }
        }
      } // loop on geomEdge ancestors

      break;
    } // case TopAbs_EDGE

    case TopAbs_FACE: { // FACE
      // ----------------------
      const TopoDS_Face& geomFace  = TopoDS::Face( sm->GetSubShape() );
      helper.SetSubShape( geomFace );

      // Find solids the geomFace bounds
      int solidID1 = 0, solidID2 = 0;
      const TopTools_ListOfShape& ancestors = _mesh->GetAncestors( geomFace );
      TopTools_ListIteratorOfListOfShape ancestorIt ( ancestors );
      for ( ; ancestorIt.More(); ancestorIt.Next() )
      {
        const TopoDS_Shape & solid = ancestorIt.Value();
        if ( solid.ShapeType() == TopAbs_SOLID  ) {
          int id = occgeom.somap.FindIndex ( solid );
          if ( solidID1 && id != solidID1 ) solidID2 = id;
          else                              solidID1 = id;
        }
      }
      faceID++;
      _faceDescriptors[ faceID ].first  = solidID1;
      _faceDescriptors[ faceID ].second = solidID2;

      // Orient the face correctly in solidID1 (issue 0020206)
      bool reverse = false;
      if ( solidID1 ) {
        TopoDS_Shape solid = occgeom.somap( solidID1 );
        for ( TopExp_Explorer f( solid, TopAbs_FACE ); f.More(); f.Next() ) {
          if ( geomFace.IsSame( f.Current() )) {
            reverse = SMESH_Algo::IsReversedSubMesh( TopoDS::Face( f.Current()), helper.GetMeshDS() );
            break;
          }
        }
      }

      // Add surface elements
      SMDS_ElemIteratorPtr faces = smDS->GetElements();
      while ( faces->more() ) {

        const SMDS_MeshElement* f = faces->next();
        if ( f->NbNodes() % 3 != 0 ) { // not triangle
          for ( ancestorIt.Initialize(ancestors); ancestorIt.More(); ancestorIt.Next() )
            if ( ancestorIt.Value().ShapeType() == TopAbs_SOLID  ) {
              sm = _mesh->GetSubMesh( ancestorIt.Value() );
              break;
            }
          SMESH_ComputeErrorPtr& smError = sm->GetComputeError();
          smError.reset( new SMESH_ComputeError(COMPERR_BAD_INPUT_MESH,"Not triangle submesh"));
          smError->myBadElements.push_back( f );
          return false;
        }

        netgen::Element2d tri(3);
        tri.SetIndex ( faceID );

        for ( int i = 0; i < 3; ++i ) {
          const SMDS_MeshNode* node = f->GetNode( i ), * inFaceNode=0;
          if ( helper.IsSeamShape( node->GetPosition()->GetShapeId() ))
            if ( helper.IsSeamShape( f->GetNodeWrap( i+1 )->GetPosition()->GetShapeId() ))
              inFaceNode = f->GetNodeWrap( i-1 );
            else 
              inFaceNode = f->GetNodeWrap( i+1 );

          gp_XY uv = helper.GetNodeUV( geomFace, node, inFaceNode );
          if ( reverse ) {
            tri.GeomInfoPi(3-i).u = uv.X();
            tri.GeomInfoPi(3-i).v = uv.Y();
            tri.PNum      (3-i) = ngNodeId( node, ngMesh, nodeNgIdMap );
          } else {
            tri.GeomInfoPi(i+1).u = uv.X();
            tri.GeomInfoPi(i+1).v = uv.Y();
            tri.PNum      (i+1) = ngNodeId( node, ngMesh, nodeNgIdMap );
          }
        }

        ngMesh.AddSurfaceElement (tri);

      }
      break;
    } //

    case TopAbs_VERTEX: { // VERTEX
      // --------------------------
      SMDS_NodeIteratorPtr nodeIt = smDS->GetNodes();
      if ( nodeIt->more() )
        ngNodeId( nodeIt->next(), ngMesh, nodeNgIdMap );
      break;
    }
    default:;
    } // switch
  } // loop on submeshes

  // fill nodeVec
  nodeVec.resize( ngMesh.GetNP() + 1 );
  TNode2IdMap::iterator node_NgId, nodeNgIdEnd = nodeNgIdMap.end();
  for ( node_NgId = nodeNgIdMap.begin(); node_NgId != nodeNgIdEnd; ++node_NgId)
    nodeVec[ node_NgId->second ] = (SMDS_MeshNode*) node_NgId->first;

  return true;
}
Exemplo n.º 7
0
bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh& aMesh,
                                     SMESH_MesherHelper* aHelper)
{
    MESSAGE("NETGENPlugin_NETGEN_3D::Compute with maxElmentsize = " << _maxElementVolume);
    const int invalid_ID = -1;
    bool _quadraticMesh = false;
    typedef map< const SMDS_MeshNode*, int, TIDCompare > TNodeToIDMap;
    TNodeToIDMap nodeToNetgenID;
    list< const SMDS_MeshElement* > triangles;
    SMESHDS_Mesh* MeshDS = aHelper->GetMeshDS();

    SMESH_MesherHelper::MType MeshType = aHelper->IsQuadraticMesh();

    if(MeshType == SMESH_MesherHelper::COMP)
        return error( COMPERR_BAD_INPUT_MESH,
                      SMESH_Comment("Mesh with linear and quadratic elements given."));
    else if (MeshType == SMESH_MesherHelper::QUADRATIC)
        _quadraticMesh = true;

    StdMeshers_QuadToTriaAdaptor Adaptor;
    Adaptor.Compute(aMesh);

    SMDS_FaceIteratorPtr fIt = MeshDS->facesIterator();
    TIDSortedElemSet sortedFaces; //  0020279: control the "random" use when using mesh algorithms
    while( fIt->more()) sortedFaces.insert( fIt->next() );

    TIDSortedElemSet::iterator itFace = sortedFaces.begin(), fEnd = sortedFaces.end();
    for ( ; itFace != fEnd; ++itFace ) {
        // check element
        const SMDS_MeshElement* elem = *itFace;
        if ( !elem )
            return error( COMPERR_BAD_INPUT_MESH, "Null element encounters");
        bool isTraingle = ( elem->NbNodes()==3 || (_quadraticMesh && elem->NbNodes()==6 ));
        if ( !isTraingle ) {
            //return error( COMPERR_BAD_INPUT_MESH,
            //              SMESH_Comment("Not triangle element ")<<elem->GetID());
            // using adaptor
            const list<const SMDS_FaceOfNodes*>* faces = Adaptor.GetTriangles(elem);
            if(faces==0) {
                return error( COMPERR_BAD_INPUT_MESH,
                              SMESH_Comment("Not triangles in adaptor for element ")<<elem->GetID());
            }
            list<const SMDS_FaceOfNodes*>::const_iterator itf = faces->begin();
            for(; itf!=faces->end(); itf++ ) {
                triangles.push_back( (*itf) );
                // put triange's nodes to nodeToNetgenID map
                SMDS_ElemIteratorPtr triangleNodesIt = (*itf)->nodesIterator();
                while ( triangleNodesIt->more() ) {
                    const SMDS_MeshNode * node =
                        static_cast<const SMDS_MeshNode *>(triangleNodesIt->next());
                    if(aHelper->IsMedium(node))
                        continue;
                    nodeToNetgenID.insert( make_pair( node, invalid_ID ));
                }
            }
        }
        else {
            // keep a triangle
            triangles.push_back( elem );
            // put elem nodes to nodeToNetgenID map
            SMDS_ElemIteratorPtr triangleNodesIt = elem->nodesIterator();
            while ( triangleNodesIt->more() ) {
                const SMDS_MeshNode * node =
                    static_cast<const SMDS_MeshNode *>(triangleNodesIt->next());
                if(aHelper->IsMedium(node))
                    continue;
                nodeToNetgenID.insert( make_pair( node, invalid_ID ));
            }
        }
    }

    // ---------------------------------
    // Feed the Netgen with surface mesh
    // ---------------------------------

    int Netgen_NbOfNodes = 0;
    int Netgen_param2ndOrder = 0;
    double Netgen_paramFine = 1.;
    double Netgen_paramSize = pow( 72, 1/6. ) * pow( _maxElementVolume, 1/3. );

    double Netgen_point[3];
    int Netgen_triangle[3];
    int Netgen_tetrahedron[4];

    Ng_Init();

    Ng_Mesh * Netgen_mesh = Ng_NewMesh();

    // set nodes and remember thier netgen IDs

    TNodeToIDMap::iterator n_id = nodeToNetgenID.begin();
    for ( ; n_id != nodeToNetgenID.end(); ++n_id )
    {
        const SMDS_MeshNode* node = n_id->first;

        Netgen_point [ 0 ] = node->X();
        Netgen_point [ 1 ] = node->Y();
        Netgen_point [ 2 ] = node->Z();
        Ng_AddPoint(Netgen_mesh, Netgen_point);
        n_id->second = ++Netgen_NbOfNodes; // set netgen ID

    }

    // set triangles
    list< const SMDS_MeshElement* >::iterator tria = triangles.begin();
    for ( ; tria != triangles.end(); ++tria)
    {
        int i = 0;
        SMDS_ElemIteratorPtr triangleNodesIt = (*tria)->nodesIterator();
        while ( triangleNodesIt->more() ) {
            const SMDS_MeshNode * node =
                static_cast<const SMDS_MeshNode *>(triangleNodesIt->next());
            if(aHelper->IsMedium(node))
                continue;
            Netgen_triangle[ i ] = nodeToNetgenID[ node ];
            ++i;
        }

        Ng_AddSurfaceElement(Netgen_mesh, NG_TRIG, Netgen_triangle);
    }

    // -------------------------
    // Generate the volume mesh
    // -------------------------

    Ng_Meshing_Parameters Netgen_param;

    Netgen_param.secondorder = Netgen_param2ndOrder;
    Netgen_param.fineness = Netgen_paramFine;
    Netgen_param.maxh = Netgen_paramSize;

    Ng_Result status;

    try {
#if (OCC_VERSION_MAJOR << 16 | OCC_VERSION_MINOR << 8 | OCC_VERSION_MAINTENANCE) > 0x060100
        OCC_CATCH_SIGNALS;
#endif
        status = Ng_GenerateVolumeMesh(Netgen_mesh, &Netgen_param);
    }
    catch (Standard_Failure& exc) {
        error(COMPERR_OCC_EXCEPTION, exc.GetMessageString());
        status = NG_VOLUME_FAILURE;
    }
    catch (...) {
        error("Bad mesh input!!!");
        status = NG_VOLUME_FAILURE;
    }
    if ( GetComputeError()->IsOK() ) {
        error( status, "Bad mesh input!!!");
    }

    int Netgen_NbOfNodesNew = Ng_GetNP(Netgen_mesh);

    int Netgen_NbOfTetra = Ng_GetNE(Netgen_mesh);

    MESSAGE("End of Volume Mesh Generation. status=" << status <<
            ", nb new nodes: " << Netgen_NbOfNodesNew - Netgen_NbOfNodes <<
            ", nb tetra: " << Netgen_NbOfTetra);

    // -------------------------------------------------------------------
    // Feed back the SMESHDS with the generated Nodes and Volume Elements
    // -------------------------------------------------------------------

    bool isOK = ( Netgen_NbOfTetra > 0 );// get whatever built
    if ( isOK )
    {
        // vector of nodes in which node index == netgen ID
        vector< const SMDS_MeshNode* > nodeVec ( Netgen_NbOfNodesNew + 1 );
        // insert old nodes into nodeVec
        for ( n_id = nodeToNetgenID.begin(); n_id != nodeToNetgenID.end(); ++n_id ) {
            nodeVec.at( n_id->second ) = n_id->first;
        }
        // create and insert new nodes into nodeVec
        int nodeIndex = Netgen_NbOfNodes + 1;

        for ( ; nodeIndex <= Netgen_NbOfNodesNew; ++nodeIndex )
        {
            Ng_GetPoint( Netgen_mesh, nodeIndex, Netgen_point );
            SMDS_MeshNode * node = aHelper->AddNode(Netgen_point[0],
                                                    Netgen_point[1],
                                                    Netgen_point[2]);
            nodeVec.at(nodeIndex) = node;
        }

        // create tetrahedrons
        for ( int elemIndex = 1; elemIndex <= Netgen_NbOfTetra; ++elemIndex )
        {
            Ng_GetVolumeElement(Netgen_mesh, elemIndex, Netgen_tetrahedron);
            aHelper->AddVolume (nodeVec.at( Netgen_tetrahedron[0] ),
                                nodeVec.at( Netgen_tetrahedron[1] ),
                                nodeVec.at( Netgen_tetrahedron[2] ),
                                nodeVec.at( Netgen_tetrahedron[3] ));
        }
    }

    Ng_DeleteMesh(Netgen_mesh);
    Ng_Exit();

    NETGENPlugin_Mesher::RemoveTmpFiles();

    return (status == NG_OK);
}
Exemplo n.º 8
0
bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh&         aMesh,
                                     const TopoDS_Shape& aShape)
{
    MESSAGE("NETGENPlugin_NETGEN_3D::Compute with maxElmentsize = " << _maxElementVolume);

    SMESHDS_Mesh* meshDS = aMesh.GetMeshDS();

    const int invalid_ID = -1;

    SMESH::Controls::Area areaControl;
    SMESH::Controls::TSequenceOfXYZ nodesCoords;

    // -------------------------------------------------------------------
    // get triangles on aShell and make a map of nodes to Netgen node IDs
    // -------------------------------------------------------------------

    SMESH_MesherHelper helper(aMesh);
    SMESH_MesherHelper* myTool = &helper;
    bool _quadraticMesh = myTool->IsQuadraticSubMesh(aShape);

    typedef map< const SMDS_MeshNode*, int, TIDCompare > TNodeToIDMap;
    TNodeToIDMap nodeToNetgenID;
    list< const SMDS_MeshElement* > triangles;
    list< bool >                    isReversed; // orientation of triangles

    TopAbs_ShapeEnum mainType = aMesh.GetShapeToMesh().ShapeType();
    bool checkReverse = ( mainType == TopAbs_COMPOUND || mainType == TopAbs_COMPSOLID );

    // for the degeneraged edge: ignore all but one node on it;
    // map storing ids of degen edges and vertices and their netgen id:
    map< int, int* > degenShapeIdToPtrNgId;
    map< int, int* >::iterator shId_ngId;
    list< int > degenNgIds;

    StdMeshers_QuadToTriaAdaptor Adaptor;
    Adaptor.Compute(aMesh,aShape);

    for (TopExp_Explorer exp(aShape,TopAbs_FACE); exp.More(); exp.Next())
    {
        const TopoDS_Shape& aShapeFace = exp.Current();
        const SMESHDS_SubMesh * aSubMeshDSFace = meshDS->MeshElements( aShapeFace );
        if ( aSubMeshDSFace )
        {
            bool isRev = false;
            if ( checkReverse && helper.NbAncestors(aShapeFace, aMesh, aShape.ShapeType()) > 1 )
                // IsReversedSubMesh() can work wrong on strongly curved faces,
                // so we use it as less as possible
                isRev = SMESH_Algo::IsReversedSubMesh( TopoDS::Face(aShapeFace), meshDS );

            SMDS_ElemIteratorPtr iteratorElem = aSubMeshDSFace->GetElements();
            while ( iteratorElem->more() ) // loop on elements on a face
            {
                // check element
                const SMDS_MeshElement* elem = iteratorElem->next();
                if ( !elem )
                    return error( COMPERR_BAD_INPUT_MESH, "Null element encounters");
                bool isTraingle = ( elem->NbNodes()==3 || (_quadraticMesh && elem->NbNodes()==6 ));
                if ( !isTraingle ) {
                    //return error( COMPERR_BAD_INPUT_MESH,
                    //              SMESH_Comment("Not triangle element ")<<elem->GetID());
                    // using adaptor
                    const list<const SMDS_FaceOfNodes*>* faces = Adaptor.GetTriangles(elem);
                    if(faces==0) {
                        return error( COMPERR_BAD_INPUT_MESH,
                                      SMESH_Comment("Not triangles in adaptor for element ")<<elem->GetID());
                    }
                    list<const SMDS_FaceOfNodes*>::const_iterator itf = faces->begin();
                    for(; itf!=faces->end(); itf++ ) {
                        triangles.push_back( (*itf) );
                        isReversed.push_back( isRev );
                        // put triange's nodes to nodeToNetgenID map
                        SMDS_ElemIteratorPtr triangleNodesIt = (*itf)->nodesIterator();
                        while ( triangleNodesIt->more() ) {
                            const SMDS_MeshNode * node =
                                static_cast<const SMDS_MeshNode *>(triangleNodesIt->next());
                            if(myTool->IsMedium(node))
                                continue;
                            nodeToNetgenID.insert( make_pair( node, invalid_ID ));
                        }
                    }
                }
                else {
                    // keep a triangle
                    triangles.push_back( elem );
                    isReversed.push_back( isRev );
                    // put elem nodes to nodeToNetgenID map
                    SMDS_ElemIteratorPtr triangleNodesIt = elem->nodesIterator();
                    while ( triangleNodesIt->more() ) {
                        const SMDS_MeshNode * node =
                            static_cast<const SMDS_MeshNode *>(triangleNodesIt->next());
                        if(myTool->IsMedium(node))
                            continue;
                        nodeToNetgenID.insert( make_pair( node, invalid_ID ));
                    }
                }
#ifdef _DEBUG_
                // check if a trainge is degenerated
                areaControl.GetPoints( elem, nodesCoords );
                double area = areaControl.GetValue( nodesCoords );
                if ( area <= DBL_MIN ) {
                    MESSAGE( "Warning: Degenerated " << elem );
                }
#endif
            }
            // look for degeneraged edges and vetices
            for (TopExp_Explorer expE(aShapeFace,TopAbs_EDGE); expE.More(); expE.Next())
            {
                TopoDS_Edge aShapeEdge = TopoDS::Edge( expE.Current() );
                if ( BRep_Tool::Degenerated( aShapeEdge ))
                {
                    degenNgIds.push_back( invalid_ID );
                    int* ptrIdOnEdge = & degenNgIds.back();
                    // remember edge id
                    int edgeID = meshDS->ShapeToIndex( aShapeEdge );
                    degenShapeIdToPtrNgId.insert( make_pair( edgeID, ptrIdOnEdge ));
                    // remember vertex id
                    int vertexID = meshDS->ShapeToIndex( TopExp::FirstVertex( aShapeEdge ));
                    degenShapeIdToPtrNgId.insert( make_pair( vertexID, ptrIdOnEdge ));
                }
            }
        }
    }
    // ---------------------------------
    // Feed the Netgen with surface mesh
    // ---------------------------------

    int Netgen_NbOfNodes = 0;
    int Netgen_param2ndOrder = 0;
    double Netgen_paramFine = 1.;
    double Netgen_paramSize = pow( 72, 1/6. ) * pow( _maxElementVolume, 1/3. );

    double Netgen_point[3];
    int Netgen_triangle[3];
    int Netgen_tetrahedron[4];

    Ng_Init();

    Ng_Mesh * Netgen_mesh = Ng_NewMesh();

    // set nodes and remember thier netgen IDs
    bool isDegen = false, hasDegen = !degenShapeIdToPtrNgId.empty();
    TNodeToIDMap::iterator n_id = nodeToNetgenID.begin();
    for ( ; n_id != nodeToNetgenID.end(); ++n_id )
    {
        const SMDS_MeshNode* node = n_id->first;

        // ignore nodes on degenerated edge
        if ( hasDegen ) {
            int shapeId = node->GetPosition()->GetShapeId();
            shId_ngId = degenShapeIdToPtrNgId.find( shapeId );
            isDegen = ( shId_ngId != degenShapeIdToPtrNgId.end() );
            if ( isDegen && *(shId_ngId->second) != invalid_ID ) {
                n_id->second = *(shId_ngId->second);
                continue;
            }
        }
        Netgen_point [ 0 ] = node->X();
        Netgen_point [ 1 ] = node->Y();
        Netgen_point [ 2 ] = node->Z();
        Ng_AddPoint(Netgen_mesh, Netgen_point);
        n_id->second = ++Netgen_NbOfNodes; // set netgen ID

        if ( isDegen ) // all nodes on a degen edge get one netgen ID
            *(shId_ngId->second) = n_id->second;
    }

    // set triangles
    list< const SMDS_MeshElement* >::iterator tria = triangles.begin();
    list< bool >::iterator                 reverse = isReversed.begin();
    for ( ; tria != triangles.end(); ++tria, ++reverse )
    {
        int i = 0;
        SMDS_ElemIteratorPtr triangleNodesIt = (*tria)->nodesIterator();
        while ( triangleNodesIt->more() ) {
            const SMDS_MeshNode * node =
                static_cast<const SMDS_MeshNode *>(triangleNodesIt->next());
            if(myTool->IsMedium(node))
                continue;
            Netgen_triangle[ *reverse ? 2 - i : i ] = nodeToNetgenID[ node ];
            ++i;
        }
        if ( !hasDegen ||
                // ignore degenerated triangles, they have 2 or 3 same ids
                (Netgen_triangle[0] != Netgen_triangle[1] &&
                 Netgen_triangle[0] != Netgen_triangle[2] &&
                 Netgen_triangle[2] != Netgen_triangle[1] ))
        {
            Ng_AddSurfaceElement(Netgen_mesh, NG_TRIG, Netgen_triangle);
        }
    }

    // -------------------------
    // Generate the volume mesh
    // -------------------------

    Ng_Meshing_Parameters Netgen_param;

    Netgen_param.secondorder = Netgen_param2ndOrder;
    Netgen_param.fineness = Netgen_paramFine;
    Netgen_param.maxh = Netgen_paramSize;

    Ng_Result status;

    try {
#if (OCC_VERSION_MAJOR << 16 | OCC_VERSION_MINOR << 8 | OCC_VERSION_MAINTENANCE) > 0x060100
        OCC_CATCH_SIGNALS;
#endif
        status = Ng_GenerateVolumeMesh(Netgen_mesh, &Netgen_param);
    }
    catch (Standard_Failure& exc) {
        error(COMPERR_OCC_EXCEPTION, exc.GetMessageString());
        status = NG_VOLUME_FAILURE;
    }
    catch (...) {
        error("Exception in Ng_GenerateVolumeMesh()");
        status = NG_VOLUME_FAILURE;
    }
    if ( GetComputeError()->IsOK() ) {
        switch ( status ) {
        case NG_SURFACE_INPUT_ERROR:
            error( status, "NG_SURFACE_INPUT_ERROR");
        case NG_VOLUME_FAILURE:
            error( status, "NG_VOLUME_FAILURE");
        case NG_STL_INPUT_ERROR:
            error( status, "NG_STL_INPUT_ERROR");
        case NG_SURFACE_FAILURE:
            error( status, "NG_SURFACE_FAILURE");
        case NG_FILE_NOT_FOUND:
            error( status, "NG_FILE_NOT_FOUND");
        };
    }

    int Netgen_NbOfNodesNew = Ng_GetNP(Netgen_mesh);

    int Netgen_NbOfTetra = Ng_GetNE(Netgen_mesh);

    MESSAGE("End of Volume Mesh Generation. status=" << status <<
            ", nb new nodes: " << Netgen_NbOfNodesNew - Netgen_NbOfNodes <<
            ", nb tetra: " << Netgen_NbOfTetra);

    // -------------------------------------------------------------------
    // Feed back the SMESHDS with the generated Nodes and Volume Elements
    // -------------------------------------------------------------------

    bool isOK = ( /*status == NG_OK &&*/ Netgen_NbOfTetra > 0 );// get whatever built
    if ( isOK )
    {
        // vector of nodes in which node index == netgen ID
        vector< const SMDS_MeshNode* > nodeVec ( Netgen_NbOfNodesNew + 1 );
        // insert old nodes into nodeVec
        for ( n_id = nodeToNetgenID.begin(); n_id != nodeToNetgenID.end(); ++n_id ) {
            nodeVec.at( n_id->second ) = n_id->first;
        }
        // create and insert new nodes into nodeVec
        int nodeIndex = Netgen_NbOfNodes + 1;
        int shapeID = meshDS->ShapeToIndex( aShape );
        for ( ; nodeIndex <= Netgen_NbOfNodesNew; ++nodeIndex )
        {
            Ng_GetPoint( Netgen_mesh, nodeIndex, Netgen_point );
            SMDS_MeshNode * node = meshDS->AddNode(Netgen_point[0],
                                                   Netgen_point[1],
                                                   Netgen_point[2]);
            meshDS->SetNodeInVolume(node, shapeID);
            nodeVec.at(nodeIndex) = node;
        }

        // create tetrahedrons
        for ( int elemIndex = 1; elemIndex <= Netgen_NbOfTetra; ++elemIndex )
        {
            Ng_GetVolumeElement(Netgen_mesh, elemIndex, Netgen_tetrahedron);
            SMDS_MeshVolume * elt = myTool->AddVolume (nodeVec.at( Netgen_tetrahedron[0] ),
                                    nodeVec.at( Netgen_tetrahedron[1] ),
                                    nodeVec.at( Netgen_tetrahedron[2] ),
                                    nodeVec.at( Netgen_tetrahedron[3] ));
            meshDS->SetMeshElementOnShape(elt, shapeID );
        }
    }

    Ng_DeleteMesh(Netgen_mesh);
    Ng_Exit();

    NETGENPlugin_Mesher::RemoveTmpFiles();

    return (status == NG_OK);
}
bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh&         aMesh,
                                     const TopoDS_Shape& aShape)
{
  netgen::multithread.terminate = 0;
  netgen::multithread.task = "Volume meshing";
  _progressByTic = -1.;

  SMESHDS_Mesh* meshDS = aMesh.GetMeshDS();

  SMESH_MesherHelper helper(aMesh);
  bool _quadraticMesh = helper.IsQuadraticSubMesh(aShape);
  helper.SetElementsOnShape( true );

  int Netgen_NbOfNodes = 0;
  double Netgen_point[3];
  int Netgen_triangle[3];

  NETGENPlugin_NetgenLibWrapper ngLib;
  Ng_Mesh * Netgen_mesh = ngLib._ngMesh;

  // vector of nodes in which node index == netgen ID
  vector< const SMDS_MeshNode* > nodeVec;
  {
    const int invalid_ID = -1;

    SMESH::Controls::Area areaControl;
    SMESH::Controls::TSequenceOfXYZ nodesCoords;

    // maps nodes to ng ID
    typedef map< const SMDS_MeshNode*, int, TIDCompare > TNodeToIDMap;
    typedef TNodeToIDMap::value_type                     TN2ID;
    TNodeToIDMap nodeToNetgenID;

    // find internal shapes
    NETGENPlugin_Internals internals( aMesh, aShape, /*is3D=*/true );

    // ---------------------------------
    // Feed the Netgen with surface mesh
    // ---------------------------------

    TopAbs_ShapeEnum mainType = aMesh.GetShapeToMesh().ShapeType();
    bool checkReverse = ( mainType == TopAbs_COMPOUND || mainType == TopAbs_COMPSOLID );

    SMESH_ProxyMesh::Ptr proxyMesh( new SMESH_ProxyMesh( aMesh ));
    if ( _viscousLayersHyp )
    {
      netgen::multithread.percent = 3;
      proxyMesh = _viscousLayersHyp->Compute( aMesh, aShape );
      if ( !proxyMesh )
        return false;
    }
    if ( aMesh.NbQuadrangles() > 0 )
    {
      netgen::multithread.percent = 6;
      StdMeshers_QuadToTriaAdaptor* Adaptor = new StdMeshers_QuadToTriaAdaptor;
      Adaptor->Compute(aMesh,aShape,proxyMesh.get());
      proxyMesh.reset( Adaptor );
    }

    for ( TopExp_Explorer exFa( aShape, TopAbs_FACE ); exFa.More(); exFa.Next())
    {
      const TopoDS_Shape& aShapeFace = exFa.Current();
      int faceID = meshDS->ShapeToIndex( aShapeFace );
      bool isInternalFace = internals.isInternalShape( faceID );
      bool isRev = false;
      if ( checkReverse && !isInternalFace &&
           helper.NbAncestors(aShapeFace, aMesh, aShape.ShapeType()) > 1 )
        // IsReversedSubMesh() can work wrong on strongly curved faces,
        // so we use it as less as possible
        isRev = helper.IsReversedSubMesh( TopoDS::Face( aShapeFace ));

      const SMESHDS_SubMesh * aSubMeshDSFace = proxyMesh->GetSubMesh( aShapeFace );
      if ( !aSubMeshDSFace ) continue;
      SMDS_ElemIteratorPtr iteratorElem = aSubMeshDSFace->GetElements();
      while ( iteratorElem->more() ) // loop on elements on a geom face
      {
        // check mesh face
        const SMDS_MeshElement* elem = iteratorElem->next();
        if ( !elem )
          return error( COMPERR_BAD_INPUT_MESH, "Null element encounters");
        if ( elem->NbCornerNodes() != 3 )
          return error( COMPERR_BAD_INPUT_MESH, "Not triangle element encounters");

        // Add nodes of triangles and triangles them-selves to netgen mesh

        // add three nodes of triangle
        bool hasDegen = false;
        for ( int iN = 0; iN < 3; ++iN )
        {
          const SMDS_MeshNode* node = elem->GetNode( iN );
          const int shapeID = node->getshapeId();
          if ( node->GetPosition()->GetTypeOfPosition() == SMDS_TOP_EDGE &&
               helper.IsDegenShape( shapeID ))
          {
            // ignore all nodes on degeneraged edge and use node on its vertex instead
            TopoDS_Shape vertex = TopoDS_Iterator( meshDS->IndexToShape( shapeID )).Value();
            node = SMESH_Algo::VertexNode( TopoDS::Vertex( vertex ), meshDS );
            hasDegen = true;
          }
          int& ngID = nodeToNetgenID.insert(TN2ID( node, invalid_ID )).first->second;
          if ( ngID == invalid_ID )
          {
            ngID = ++Netgen_NbOfNodes;
            Netgen_point [ 0 ] = node->X();
            Netgen_point [ 1 ] = node->Y();
            Netgen_point [ 2 ] = node->Z();
            Ng_AddPoint(Netgen_mesh, Netgen_point);
          }
          Netgen_triangle[ isRev ? 2-iN : iN ] = ngID;
        }
        // add triangle
        if ( hasDegen && (Netgen_triangle[0] == Netgen_triangle[1] ||
                          Netgen_triangle[0] == Netgen_triangle[2] ||
                          Netgen_triangle[2] == Netgen_triangle[1] ))
          continue;

        Ng_AddSurfaceElement(Netgen_mesh, NG_TRIG, Netgen_triangle);

        if ( isInternalFace && !proxyMesh->IsTemporary( elem ))
        {
          swap( Netgen_triangle[1], Netgen_triangle[2] );
          Ng_AddSurfaceElement(Netgen_mesh, NG_TRIG, Netgen_triangle);
        }
      } // loop on elements on a face
    } // loop on faces of a SOLID or SHELL

    // insert old nodes into nodeVec
    nodeVec.resize( nodeToNetgenID.size() + 1, 0 );
    TNodeToIDMap::iterator n_id = nodeToNetgenID.begin();
    for ( ; n_id != nodeToNetgenID.end(); ++n_id )
      nodeVec[ n_id->second ] = n_id->first;
    nodeToNetgenID.clear();

    if ( internals.hasInternalVertexInSolid() )
    {
      netgen::OCCGeometry occgeo;
      NETGENPlugin_Mesher::AddIntVerticesInSolids( occgeo,
                                                   (netgen::Mesh&) *Netgen_mesh,
                                                   nodeVec,
                                                   internals);
    }
  }

  // -------------------------
  // Generate the volume mesh
  // -------------------------

  return ( ngLib._isComputeOk = compute( aMesh, helper, nodeVec, Netgen_mesh));
}
bool NETGENPlugin_NETGEN_3D::Compute(SMESH_Mesh&         aMesh,
                                     SMESH_MesherHelper* aHelper)
{
  const int invalid_ID = -1;

  netgen::multithread.terminate = 0;
  _progressByTic = -1.;

  SMESH_MesherHelper::MType MeshType = aHelper->IsQuadraticMesh();
  if ( MeshType == SMESH_MesherHelper::COMP )
    return error( COMPERR_BAD_INPUT_MESH,
                  SMESH_Comment("Mesh with linear and quadratic elements given"));

  aHelper->SetIsQuadratic( MeshType == SMESH_MesherHelper::QUADRATIC );

  // ---------------------------------
  // Feed the Netgen with surface mesh
  // ---------------------------------

  int Netgen_NbOfNodes = 0;
  int Netgen_param2ndOrder = 0;
  double Netgen_paramFine = 1.;
  double Netgen_paramSize = pow( 72, 1/6. ) * pow( _maxElementVolume, 1/3. );

  double Netgen_point[3];
  int Netgen_triangle[3];
  int Netgen_tetrahedron[4];

  NETGENPlugin_NetgenLibWrapper ngLib;
  Ng_Mesh * Netgen_mesh = ngLib._ngMesh;

  SMESH_ProxyMesh::Ptr proxyMesh( new SMESH_ProxyMesh( aMesh ));
  if ( aMesh.NbQuadrangles() > 0 )
  {
    StdMeshers_QuadToTriaAdaptor* Adaptor = new StdMeshers_QuadToTriaAdaptor;
    Adaptor->Compute(aMesh);
    proxyMesh.reset( Adaptor );
  }

  // maps nodes to ng ID
  typedef map< const SMDS_MeshNode*, int, TIDCompare > TNodeToIDMap;
  typedef TNodeToIDMap::value_type                     TN2ID;
  TNodeToIDMap nodeToNetgenID;

  SMDS_ElemIteratorPtr fIt = proxyMesh->GetFaces();
  while( fIt->more())
  {
    // check element
    const SMDS_MeshElement* elem = fIt->next();
    if ( !elem )
      return error( COMPERR_BAD_INPUT_MESH, "Null element encounters");
    if ( elem->NbCornerNodes() != 3 )
      return error( COMPERR_BAD_INPUT_MESH, "Not triangle element encounters");
      
    // add three nodes of triangle
    for ( int iN = 0; iN < 3; ++iN )
    {
      const SMDS_MeshNode* node = elem->GetNode( iN );
      int& ngID = nodeToNetgenID.insert(TN2ID( node, invalid_ID )).first->second;
      if ( ngID == invalid_ID )
      {
        ngID = ++Netgen_NbOfNodes;
        Netgen_point [ 0 ] = node->X();
        Netgen_point [ 1 ] = node->Y();
        Netgen_point [ 2 ] = node->Z();
        Ng_AddPoint(Netgen_mesh, Netgen_point);
      }
      Netgen_triangle[ iN ] = ngID;
    }
    Ng_AddSurfaceElement(Netgen_mesh, NG_TRIG, Netgen_triangle);
  }
  proxyMesh.reset(); // delete tmp faces

  // vector of nodes in which node index == netgen ID
  vector< const SMDS_MeshNode* > nodeVec ( nodeToNetgenID.size() + 1 );
  // insert old nodes into nodeVec
  TNodeToIDMap::iterator n_id = nodeToNetgenID.begin();
  for ( ; n_id != nodeToNetgenID.end(); ++n_id )
    nodeVec.at( n_id->second ) = n_id->first;
  nodeToNetgenID.clear();

  // -------------------------
  // Generate the volume mesh
  // -------------------------

  return ( ngLib._isComputeOk = compute( aMesh, *aHelper, nodeVec, Netgen_mesh));
}
Exemplo n.º 11
0
bool SMESH_Algo::IsReversedSubMesh (const TopoDS_Face&  theFace,
                                    SMESHDS_Mesh*       theMeshDS)
{
  if ( theFace.IsNull() || !theMeshDS )
    return false;

  // find out orientation of a meshed face
  int faceID = theMeshDS->ShapeToIndex( theFace );
  TopoDS_Shape aMeshedFace = theMeshDS->IndexToShape( faceID );
  bool isReversed = ( theFace.Orientation() != aMeshedFace.Orientation() );

  const SMESHDS_SubMesh * aSubMeshDSFace = theMeshDS->MeshElements( faceID );
  if ( !aSubMeshDSFace )
    return isReversed;

  // find element with node located on face and get its normal
  const SMDS_FacePosition* facePos = 0;
  int vertexID = 0;
  gp_Pnt nPnt[3];
  gp_Vec Ne;
  bool normalOK = false;
  SMDS_ElemIteratorPtr iteratorElem = aSubMeshDSFace->GetElements();
  while ( iteratorElem->more() ) // loop on elements on theFace
  {
    const SMDS_MeshElement* elem = iteratorElem->next();
    if ( elem && elem->NbNodes() > 2 ) {
      SMDS_ElemIteratorPtr nodesIt = elem->nodesIterator();
      const SMDS_FacePosition* fPos = 0;
      int i = 0, vID = 0;
      while ( nodesIt->more() ) { // loop on nodes
        const SMDS_MeshNode* node
          = static_cast<const SMDS_MeshNode *>(nodesIt->next());
        if ( i == 3 ) i = 2;
        nPnt[ i++ ].SetCoord( node->X(), node->Y(), node->Z() );
        // check position
        const SMDS_PositionPtr& pos = node->GetPosition();
        if ( !pos ) continue;
        if ( pos->GetTypeOfPosition() == SMDS_TOP_FACE ) {
          fPos = dynamic_cast< const SMDS_FacePosition* >( pos.get() );
        }
        else if ( pos->GetTypeOfPosition() == SMDS_TOP_VERTEX ) {
          vID = pos->GetShapeId();
        }
      }
      if ( fPos || ( !normalOK && vID )) {
        // compute normal
        gp_Vec v01( nPnt[0], nPnt[1] ), v02( nPnt[0], nPnt[2] );
        if ( v01.SquareMagnitude() > RealSmall() &&
             v02.SquareMagnitude() > RealSmall() )
        {
          Ne = v01 ^ v02;
          normalOK = ( Ne.SquareMagnitude() > RealSmall() );
        }
        // we need position on theFace or at least on vertex
        if ( normalOK ) {
          vertexID = vID;
          if ((facePos = fPos))
            break;
        }
      }
    }
  }
  if ( !normalOK )
    return isReversed;

  // node position on face
  double u,v;
  if ( facePos ) {
    u = facePos->GetUParameter();
    v = facePos->GetVParameter();
  }
  else if ( vertexID ) {
    TopoDS_Shape V = theMeshDS->IndexToShape( vertexID );
    if ( V.IsNull() || V.ShapeType() != TopAbs_VERTEX )
      return isReversed;
    gp_Pnt2d uv = BRep_Tool::Parameters( TopoDS::Vertex( V ), theFace );
    u = uv.X();
    v = uv.Y();
  }
  else
  {
    return isReversed;
  }

  // face normal at node position
  TopLoc_Location loc;
  Handle(Geom_Surface) surf = BRep_Tool::Surface( theFace, loc );
  if ( surf.IsNull() || surf->Continuity() < GeomAbs_C1 ) return isReversed;
  gp_Vec d1u, d1v;
  surf->D1( u, v, nPnt[0], d1u, d1v );
  gp_Vec Nf = (d1u ^ d1v).Transformed( loc );

  if ( theFace.Orientation() == TopAbs_REVERSED )
    Nf.Reverse();

  return Ne * Nf < 0.;
}
Exemplo n.º 12
0
StdMeshers_FaceSide::StdMeshers_FaceSide(const TopoDS_Face& theFace,
                                         list<TopoDS_Edge>& theEdges,
                                         SMESH_Mesh*        theMesh,
                                         const bool         theIsForward,
                                         const bool         theIgnoreMediumNodes)
{
  int nbEdges = theEdges.size();
  myEdge.resize( nbEdges );
  myC2d.resize( nbEdges );
  myFirst.resize( nbEdges );
  myLast.resize( nbEdges );
  myNormPar.resize( nbEdges );
  myLength = 0;
  myNbPonits = myNbSegments = 0;
  myMesh = theMesh;
  myMissingVertexNodes = false;
  myIgnoreMediumNodes = theIgnoreMediumNodes;
  if ( nbEdges == 0 ) return;

  SMESHDS_Mesh* meshDS = theMesh->GetMeshDS();
  vector<double> len( nbEdges );

  int nbDegen = 0;
  list<TopoDS_Edge>::iterator edge = theEdges.begin();
  for ( int index = 0; edge != theEdges.end(); ++index, ++edge )
  {
    int i = theIsForward ? index : nbEdges - index - 1;
    len[i] = SMESH_Algo::EdgeLength( *edge );
    if ( len[i] < DBL_MIN ) nbDegen++;
    myLength += len[i];
    myEdge[i] = *edge;
    if ( !theIsForward ) myEdge[i].Reverse();

    if ( theFace.IsNull() )
      BRep_Tool::Range( *edge, myFirst[i], myLast[i] );
    else
      myC2d[i] = BRep_Tool::CurveOnSurface( *edge, theFace, myFirst[i], myLast[i] );
    if ( myEdge[i].Orientation() == TopAbs_REVERSED )
      std::swap( myFirst[i], myLast[i] );

    if ( SMESHDS_SubMesh* sm = meshDS->MeshElements( *edge )) {
      int nbN = sm->NbNodes();
      if ( theIgnoreMediumNodes ) {
        SMDS_ElemIteratorPtr elemIt = sm->GetElements();
        if ( elemIt->more() && elemIt->next()->IsQuadratic() )
          nbN -= sm->NbElements();
      }
      myNbPonits += nbN;
      myNbSegments += sm->NbElements();
    }
    if ( SMESH_Algo::VertexNode( TopExp::FirstVertex( *edge, 1), meshDS ))
      myNbPonits += 1; // for the first end
    else
      myMissingVertexNodes = true;
  }
  if ( SMESH_Algo::VertexNode( TopExp::LastVertex( theEdges.back(), 1), meshDS ))
    myNbPonits++; // for the last end
  else
    myMissingVertexNodes = true;

  if ( nbEdges > 1 && myLength > DBL_MIN ) {
    const double degenNormLen = 1.e-5;
    double totLength = myLength;
    if ( nbDegen )
      totLength += myLength * degenNormLen * nbDegen;
    double prevNormPar = 0;
    for ( int i = 0; i < nbEdges; ++i ) {
      if ( len[ i ] < DBL_MIN )
        len[ i ] = myLength * degenNormLen;
      myNormPar[ i ] = prevNormPar + len[i]/totLength;
      prevNormPar = myNormPar[ i ];
    }
  }
  myNormPar[nbEdges-1] = 1.;
  //dump();
}
bool StdMeshers_RadialPrism_3D::Compute(SMESH_Mesh& aMesh, const TopoDS_Shape& aShape)
{
  TopExp_Explorer exp;
  SMESHDS_Mesh * meshDS = aMesh.GetMeshDS();

  myHelper = new SMESH_MesherHelper( aMesh );
  myHelper->IsQuadraticSubMesh( aShape );
  // to delete helper at exit from Compute()
  std::auto_ptr<SMESH_MesherHelper> helperDeleter( myHelper );

  // get 2 shells
  TopoDS_Solid solid = TopoDS::Solid( aShape );
  TopoDS_Shell outerShell = BRepClass3d::OuterShell( solid );
  TopoDS_Shape innerShell;
  int nbShells = 0;
  for ( TopoDS_Iterator It (solid); It.More(); It.Next(), ++nbShells )
    if ( !outerShell.IsSame( It.Value() ))
      innerShell = It.Value();
  if ( nbShells != 2 )
    return error(COMPERR_BAD_SHAPE, SMESH_Comment("Must be 2 shells but not ")<<nbShells);

  // ----------------------------------
  // Associate sub-shapes of the shells
  // ----------------------------------

  ProjectionUtils::TShapeShapeMap shape2ShapeMaps[2];
  bool mapOk1 = ProjectionUtils::FindSubShapeAssociation( innerShell, &aMesh,
                                                          outerShell, &aMesh,
                                                          shape2ShapeMaps[0]);
  bool mapOk2 = ProjectionUtils::FindSubShapeAssociation( innerShell.Reversed(), &aMesh,
                                                          outerShell, &aMesh,
                                                          shape2ShapeMaps[1]);
  if ( !mapOk1 && !mapOk2 )
    return error(COMPERR_BAD_SHAPE,"Topology of inner and outer shells seems different" );

  int iMap;
  if ( shape2ShapeMaps[0].Extent() == shape2ShapeMaps[1].Extent() )
  {
    // choose an assiciation by shortest distance between VERTEXes
    double dist1 = 0, dist2 = 0;
    TopTools_DataMapIteratorOfDataMapOfShapeShape ssIt( shape2ShapeMaps[0]._map1to2 );
    for (; ssIt.More(); ssIt.Next() )
    {
      if ( ssIt.Key().ShapeType() != TopAbs_VERTEX ) continue;
      gp_Pnt pIn   = BRep_Tool::Pnt( TopoDS::Vertex( ssIt.Key() ));
      gp_Pnt pOut1 = BRep_Tool::Pnt( TopoDS::Vertex( ssIt.Value() ));
      gp_Pnt pOut2 = BRep_Tool::Pnt( TopoDS::Vertex( shape2ShapeMaps[1]( ssIt.Key() )));
      dist1 += pIn.SquareDistance( pOut1 );
      dist2 += pIn.SquareDistance( pOut2 );
    }
    iMap = ( dist1 < dist2 ) ? 0 : 1;
  }
  else
  {
    iMap = ( shape2ShapeMaps[0].Extent() > shape2ShapeMaps[1].Extent() ) ? 0 : 1;
  }
  ProjectionUtils::TShapeShapeMap& shape2ShapeMap = shape2ShapeMaps[iMap];

  // ------------------
  // Make mesh
  // ------------------

  TNode2ColumnMap node2columnMap;
  myLayerPositions.clear();

  for ( exp.Init( outerShell, TopAbs_FACE ); exp.More(); exp.Next() )
  {
    // Corresponding sub-shapes
    TopoDS_Face outFace = TopoDS::Face( exp.Current() );
    TopoDS_Face inFace;
    if ( !shape2ShapeMap.IsBound( outFace, /*isOut=*/true )) {
      return error(SMESH_Comment("Corresponding inner face not found for face #" )
                   << meshDS->ShapeToIndex( outFace ));
    } else {
      inFace = TopoDS::Face( shape2ShapeMap( outFace, /*isOut=*/true ));
    }

    // Find matching nodes of in and out faces
    ProjectionUtils::TNodeNodeMap nodeIn2OutMap;
    if ( ! ProjectionUtils::FindMatchingNodesOnFaces( inFace, &aMesh, outFace, &aMesh,
                                                      shape2ShapeMap, nodeIn2OutMap ))
      return error(COMPERR_BAD_INPUT_MESH,SMESH_Comment("Mesh on faces #")
                   << meshDS->ShapeToIndex( outFace ) << " and "
                   << meshDS->ShapeToIndex( inFace ) << " seems different" );

    // Create volumes

    SMDS_ElemIteratorPtr faceIt = meshDS->MeshElements( inFace )->GetElements();
    while ( faceIt->more() ) // loop on faces on inFace
    {
      const SMDS_MeshElement* face = faceIt->next();
      if ( !face || face->GetType() != SMDSAbs_Face )
        continue;
      int nbNodes = face->NbNodes();
      if ( face->IsQuadratic() )
        nbNodes /= 2;

      // find node columns for each node
      vector< const TNodeColumn* > columns( nbNodes );
      for ( int i = 0; i < nbNodes; ++i )
      {
        const SMDS_MeshNode* nIn = face->GetNode( i );
        TNode2ColumnMap::iterator n_col = node2columnMap.find( nIn );
        if ( n_col != node2columnMap.end() ) {
          columns[ i ] = & n_col->second;
        }
        else {
          TNodeNodeMap::iterator nInOut = nodeIn2OutMap.find( nIn );
          if ( nInOut == nodeIn2OutMap.end() )
            RETURN_BAD_RESULT("No matching node for "<< nIn->GetID() <<
                              " in face "<< face->GetID());
          columns[ i ] = makeNodeColumn( node2columnMap, nIn, nInOut->second );
        }
      }

      StdMeshers_Prism_3D::AddPrisms( columns, myHelper );
    }
  } // loop on faces of out shell

  return true;
}
bool StdMeshers_RadialPrism_3D::Compute(SMESH_Mesh& aMesh, const TopoDS_Shape& aShape)
{
  TopExp_Explorer exp;
  SMESHDS_Mesh * meshDS = aMesh.GetMeshDS();

  myHelper = new SMESH_MesherHelper( aMesh );
  myHelper->IsQuadraticSubMesh( aShape );
  // to delete helper at exit from Compute()
  std::auto_ptr<SMESH_MesherHelper> helperDeleter( myHelper );

  // get 2 shells
  TopoDS_Solid solid = TopoDS::Solid( aShape );
  TopoDS_Shell outerShell = BRepClass3d::OuterShell( solid );
  TopoDS_Shape innerShell;
  int nbShells = 0;
  for ( TopoDS_Iterator It (solid); It.More(); It.Next(), ++nbShells )
    if ( !outerShell.IsSame( It.Value() ))
      innerShell = It.Value();
  if ( nbShells != 2 )
    return error(COMPERR_BAD_SHAPE, SMESH_Comment("Must be 2 shells but not ")<<nbShells);

  // ----------------------------------
  // Associate subshapes of the shells
  // ----------------------------------

  TAssocTool::TShapeShapeMap shape2ShapeMap;
  if ( !TAssocTool::FindSubShapeAssociation( outerShell, &aMesh,
                                             innerShell, &aMesh,
                                             shape2ShapeMap) )
    return error(COMPERR_BAD_SHAPE,"Topology of inner and outer shells seems different" );

  // ------------------
  // Make mesh
  // ------------------

  TNode2ColumnMap node2columnMap;
  myLayerPositions.clear();

  for ( exp.Init( outerShell, TopAbs_FACE ); exp.More(); exp.Next() )
  {
    // Corresponding subshapes
    TopoDS_Face outFace = TopoDS::Face( exp.Current() );
    TopoDS_Face inFace;
    if ( !shape2ShapeMap.IsBound( outFace )) {
      return error(SMESH_Comment("Corresponding inner face not found for face #" )
                   << meshDS->ShapeToIndex( outFace ));
    } else {
      inFace = TopoDS::Face( shape2ShapeMap( outFace ));
    }

    // Find matching nodes of in and out faces
    TNodeNodeMap nodeIn2OutMap;
    if ( ! TAssocTool::FindMatchingNodesOnFaces( inFace, &aMesh, outFace, &aMesh,
                                                 shape2ShapeMap, nodeIn2OutMap ))
      return error(COMPERR_BAD_INPUT_MESH,SMESH_Comment("Mesh on faces #")
                   << meshDS->ShapeToIndex( outFace ) << " and "
                   << meshDS->ShapeToIndex( inFace ) << " seems different" );

    // Create volumes

    SMDS_ElemIteratorPtr faceIt = meshDS->MeshElements( inFace )->GetElements();
    while ( faceIt->more() ) // loop on faces on inFace
    {
      const SMDS_MeshElement* face = faceIt->next();
      if ( !face || face->GetType() != SMDSAbs_Face )
        continue;
      int nbNodes = face->NbNodes();
      if ( face->IsQuadratic() )
        nbNodes /= 2;

      // find node columns for each node
      vector< const TNodeColumn* > columns( nbNodes );
      for ( int i = 0; i < nbNodes; ++i )
      {
        const SMDS_MeshNode* nIn = face->GetNode( i );
        TNode2ColumnMap::iterator n_col = node2columnMap.find( nIn );
        if ( n_col != node2columnMap.end() ) {
          columns[ i ] = & n_col->second;
        }
        else {
          TNodeNodeMap::iterator nInOut = nodeIn2OutMap.find( nIn );
          if ( nInOut == nodeIn2OutMap.end() )
            RETURN_BAD_RESULT("No matching node for "<< nIn->GetID() <<
                              " in face "<< face->GetID());
          columns[ i ] = makeNodeColumn( node2columnMap, nIn, nInOut->second );
        }
      }

      StdMeshers_Prism_3D::AddPrisms( columns, myHelper );
    }
  } // loop on faces of out shell

  return true;
}
Exemplo n.º 15
0
bool StdMeshers_Projection_3D::Compute(SMESH_Mesh& aMesh, const TopoDS_Shape& aShape)
{
  if ( !_sourceHypo )
    return false;

  SMESH_Mesh * srcMesh = _sourceHypo->GetSourceMesh();
  SMESH_Mesh * tgtMesh = & aMesh;
  if ( !srcMesh )
    srcMesh = tgtMesh;

  SMESHDS_Mesh * srcMeshDS = srcMesh->GetMeshDS();
  SMESHDS_Mesh * tgtMeshDS = tgtMesh->GetMeshDS();

  // get shell from shape3D
  TopoDS_Shell srcShell, tgtShell;
  TopExp_Explorer exp( _sourceHypo->GetSource3DShape(), TopAbs_SHELL );
  int nbShell;
  for ( nbShell = 0; exp.More(); exp.Next(), ++nbShell )
    srcShell = TopoDS::Shell( exp.Current() );
  if ( nbShell != 1 )
    return error(COMPERR_BAD_SHAPE,
                 SMESH_Comment("Source shape must have 1 shell but not ") << nbShell);

  exp.Init( aShape, TopAbs_SHELL );
  for ( nbShell = 0; exp.More(); exp.Next(), ++nbShell )
    tgtShell = TopoDS::Shell( exp.Current() );
  if ( nbShell != 1 )
    return error(COMPERR_BAD_SHAPE,
                 SMESH_Comment("Target shape must have 1 shell but not ") << nbShell);

  // Check that shapes are blocks
  if ( TAssocTool::Count( tgtShell, TopAbs_FACE , 1 ) != 6 ||
       TAssocTool::Count( tgtShell, TopAbs_EDGE , 1 ) != 12 ||
       TAssocTool::Count( tgtShell, TopAbs_WIRE , 1 ) != 6 )
    return error(COMPERR_BAD_SHAPE, "Target shape is not a block");
  if ( TAssocTool::Count( srcShell, TopAbs_FACE , 1 ) != 6 ||
       TAssocTool::Count( srcShell, TopAbs_EDGE , 1 ) != 12 ||
       TAssocTool::Count( srcShell, TopAbs_WIRE , 1 ) != 6 )
    return error(COMPERR_BAD_SHAPE, "Source shape is not a block");

  // Assure that mesh on a source shape is computed

  SMESH_subMesh* srcSubMesh = srcMesh->GetSubMesh( _sourceHypo->GetSource3DShape() );
  //SMESH_subMesh* tgtSubMesh = tgtMesh->GetSubMesh( aShape );

  if ( tgtMesh == srcMesh && !aShape.IsSame( _sourceHypo->GetSource3DShape() )) {
    if ( !TAssocTool::MakeComputed( srcSubMesh ))
      return error(COMPERR_BAD_INPUT_MESH,"Source mesh not computed");
  }
  else {
    if ( !srcSubMesh->IsMeshComputed() )
      return error(COMPERR_BAD_INPUT_MESH,"Source mesh not computed");
  }

  // Find 2 pairs of corresponding vertices

  TopoDS_Vertex tgtV000, tgtV100, srcV000, srcV100;
  TAssocTool::TShapeShapeMap shape2ShapeMap;

  if ( _sourceHypo->HasVertexAssociation() )
  {
    tgtV000 = _sourceHypo->GetTargetVertex(1);
    tgtV100 = _sourceHypo->GetTargetVertex(2);
    srcV000 = _sourceHypo->GetSourceVertex(1);
    srcV100 = _sourceHypo->GetSourceVertex(2);
  }
  else
  {
    if ( !TAssocTool::FindSubShapeAssociation( tgtShell, tgtMesh, srcShell, srcMesh,
                                               shape2ShapeMap) )
      return error(COMPERR_BAD_SHAPE,"Topology of source and target shapes seems different" );

    exp.Init( tgtShell, TopAbs_EDGE );
    TopExp::Vertices( TopoDS::Edge( exp.Current() ), tgtV000, tgtV100 );

    if ( !shape2ShapeMap.IsBound( tgtV000 ) || !shape2ShapeMap.IsBound( tgtV100 ))
      return error("Association of subshapes failed" );
    srcV000 = TopoDS::Vertex( shape2ShapeMap( tgtV000 ));
    srcV100 = TopoDS::Vertex( shape2ShapeMap( tgtV100 ));
    if ( !TAssocTool::IsSubShape( srcV000, srcShell ) ||
         !TAssocTool::IsSubShape( srcV100, srcShell ))
      return error("Incorrect association of subshapes" );
  }

  // Load 2 SMESH_Block's with src and tgt shells

  SMESH_Block srcBlock, tgtBlock;
  TopTools_IndexedMapOfOrientedShape scrShapes, tgtShapes;
  if ( !tgtBlock.LoadBlockShapes( tgtShell, tgtV000, tgtV100, tgtShapes ))
    return error(COMPERR_BAD_SHAPE, "Can't detect block subshapes. Not a block?");

  if ( !srcBlock.LoadBlockShapes( srcShell, srcV000, srcV100, scrShapes ))
    return error(COMPERR_BAD_SHAPE, "Can't detect block subshapes. Not a block?");

  // Find matching nodes of src and tgt shells

  TNodeNodeMap src2tgtNodeMap;
  for ( int fId = SMESH_Block::ID_FirstF; fId < SMESH_Block::ID_Shell; ++fId )
  {
    // Corresponding subshapes
    TopoDS_Face srcFace = TopoDS::Face( scrShapes( fId ));
    TopoDS_Face tgtFace = TopoDS::Face( tgtShapes( fId ));
    if ( _sourceHypo->HasVertexAssociation() ) { // associate face subshapes
      shape2ShapeMap.Clear();
      vector< int > edgeIdVec;
      SMESH_Block::GetFaceEdgesIDs( fId, edgeIdVec );
      for ( int i = 0; i < edgeIdVec.size(); ++i ) {
        int eID = edgeIdVec[ i ];
        shape2ShapeMap.Bind( tgtShapes( eID ), scrShapes( eID ));
        if ( i < 2 ) {
          vector< int > vertexIdVec;
          SMESH_Block::GetEdgeVertexIDs( eID, vertexIdVec );
          shape2ShapeMap.Bind( tgtShapes( vertexIdVec[0] ), scrShapes( vertexIdVec[0] ));
          shape2ShapeMap.Bind( tgtShapes( vertexIdVec[1] ), scrShapes( vertexIdVec[1] ));
        }
      }
    }
    // Find matching nodes of tgt and src faces
    TNodeNodeMap faceMatchingNodes;
    if ( ! TAssocTool::FindMatchingNodesOnFaces( srcFace, srcMesh, tgtFace, tgtMesh, 
                                                 shape2ShapeMap, faceMatchingNodes ))
    return error(COMPERR_BAD_INPUT_MESH,SMESH_Comment("Mesh on faces #")
                 << srcMeshDS->ShapeToIndex( srcFace ) << " and "
                 << tgtMeshDS->ShapeToIndex( tgtFace ) << " seems different" );

    // put found matching nodes of 2 faces to the global map
    src2tgtNodeMap.insert( faceMatchingNodes.begin(), faceMatchingNodes.end() );
  }

  // ------------------
  // Make mesh
  // ------------------

  SMDS_VolumeTool volTool;
  SMESH_MesherHelper helper( *tgtMesh );
  helper.IsQuadraticSubMesh( aShape );

  SMESHDS_SubMesh* srcSMDS = srcSubMesh->GetSubMeshDS();
  SMDS_ElemIteratorPtr volIt = srcSMDS->GetElements();
  while ( volIt->more() ) // loop on source volumes
  {
    const SMDS_MeshElement* srcVol = volIt->next();
    if ( !srcVol || srcVol->GetType() != SMDSAbs_Volume )
        continue;
    int nbNodes = srcVol->NbNodes();
    SMDS_VolumeTool::VolumeType  volType = volTool.GetType( nbNodes );
    if ( srcVol->IsQuadratic() )
      nbNodes = volTool.NbCornerNodes( volType );

    // Find or create a new tgt node for each node of a src volume

    vector< const SMDS_MeshNode* > nodes( nbNodes );
    for ( int i = 0; i < nbNodes; ++i )
    {
      const SMDS_MeshNode* srcNode = srcVol->GetNode( i );
      const SMDS_MeshNode* tgtNode = 0;
      TNodeNodeMap::iterator sN_tN = src2tgtNodeMap.find( srcNode );
      if ( sN_tN != src2tgtNodeMap.end() ) // found
      {
        tgtNode = sN_tN->second;
      }
      else // Create a new tgt node
      {
        // compute normalized parameters of source node in srcBlock
        gp_Pnt srcCoord = gpXYZ( srcNode );
        gp_XYZ srcParam;
        if ( !srcBlock.ComputeParameters( srcCoord, srcParam ))
          return error(SMESH_Comment("Can't compute normalized parameters ")
                       << "for source node " << srcNode->GetID());
        // compute coordinates of target node by srcParam
        gp_XYZ tgtXYZ;
        if ( !tgtBlock.ShellPoint( srcParam, tgtXYZ ))
          return error("Can't compute coordinates by normalized parameters");
        // add node
        SMDS_MeshNode* newNode = tgtMeshDS->AddNode( tgtXYZ.X(), tgtXYZ.Y(), tgtXYZ.Z() );
        tgtMeshDS->SetNodeInVolume( newNode, helper.GetSubShapeID() );
        tgtNode = newNode;
        src2tgtNodeMap.insert( make_pair( srcNode, tgtNode ));
      }
      nodes[ i ] = tgtNode;
    }

    // Create a new volume

    SMDS_MeshVolume * tgtVol = 0;
    int id = 0, force3d = false;
    switch ( volType ) {
    case SMDS_VolumeTool::TETRA     :
    case SMDS_VolumeTool::QUAD_TETRA:
      tgtVol = helper.AddVolume( nodes[0],
                                 nodes[1],
                                 nodes[2],
                                 nodes[3], id, force3d); break;
    case SMDS_VolumeTool::PYRAM     :
    case SMDS_VolumeTool::QUAD_PYRAM:
      tgtVol = helper.AddVolume( nodes[0],
                                 nodes[1],
                                 nodes[2],
                                 nodes[3],
                                 nodes[4], id, force3d); break;
    case SMDS_VolumeTool::PENTA     :
    case SMDS_VolumeTool::QUAD_PENTA:
      tgtVol = helper.AddVolume( nodes[0],
                                 nodes[1],
                                 nodes[2],
                                 nodes[3],
                                 nodes[4],
                                 nodes[5], id, force3d); break;
    case SMDS_VolumeTool::HEXA      :
    case SMDS_VolumeTool::QUAD_HEXA :
      tgtVol = helper.AddVolume( nodes[0],
                                 nodes[1],
                                 nodes[2],
                                 nodes[3],
                                 nodes[4],
                                 nodes[5],
                                 nodes[6],
                                 nodes[7], id, force3d); break;
    default: // polyhedron
      const SMDS_PolyhedralVolumeOfNodes * poly =
        dynamic_cast<const SMDS_PolyhedralVolumeOfNodes*>( srcVol );
      if ( !poly )
        RETURN_BAD_RESULT("Unexpected volume type");
      tgtVol = tgtMeshDS->AddPolyhedralVolume( nodes, poly->GetQuanities() );
    }
    if ( tgtVol ) {
      tgtMeshDS->SetMeshElementOnShape( tgtVol, helper.GetSubShapeID() );
    }
  } // loop on volumes of src shell

  return true;
}
Exemplo n.º 16
0
bool NETGENPlugin_NETGEN_2D_ONLY::Compute(SMESH_Mesh&         aMesh,
        const TopoDS_Shape& aShape)
{
    netgen::multithread.terminate = 0;
    //netgen::multithread.task = "Surface meshing";

    SMESHDS_Mesh* meshDS = aMesh.GetMeshDS();
    SMESH_MesherHelper helper(aMesh);
    helper.SetElementsOnShape( true );

    NETGENPlugin_NetgenLibWrapper ngLib;
    ngLib._isComputeOk = false;

    netgen::Mesh   ngMeshNoLocSize;
#if NETGEN_VERSION < 6
    netgen::Mesh * ngMeshes[2] = { (netgen::Mesh*) ngLib._ngMesh,  & ngMeshNoLocSize };
#else
    netgen::Mesh * ngMeshes[2] = { (netgen::Mesh*) ngLib._ngMesh.get(),  & ngMeshNoLocSize };
#endif
    netgen::OCCGeometry occgeoComm;

    // min / max sizes are set as follows:
    // if ( _hypParameters )
    //    min and max are defined by the user
    // else if ( _hypLengthFromEdges )
    //    min = aMesher.GetDefaultMinSize()
    //    max = average segment len of a FACE
    // else if ( _hypMaxElementArea )
    //    min = aMesher.GetDefaultMinSize()
    //    max = f( _hypMaxElementArea )
    // else
    //    min = aMesher.GetDefaultMinSize()
    //    max = max segment len of a FACE

    NETGENPlugin_Mesher aMesher( &aMesh, aShape, /*isVolume=*/false);
    aMesher.SetParameters( _hypParameters ); // _hypParameters -> netgen::mparam
    const bool toOptimize = _hypParameters ? _hypParameters->GetOptimize() : true;
    if ( _hypMaxElementArea )
    {
        netgen::mparam.maxh = sqrt( 2. * _hypMaxElementArea->GetMaxArea() / sqrt(3.0) );
    }
    if ( _hypQuadranglePreference )
        netgen::mparam.quad = true;

    // local size is common for all FACEs in aShape?
    const bool isCommonLocalSize = ( !_hypLengthFromEdges && !_hypMaxElementArea && netgen::mparam.uselocalh );
    const bool isDefaultHyp = ( !_hypLengthFromEdges && !_hypMaxElementArea && !_hypParameters );

    if ( isCommonLocalSize ) // compute common local size in ngMeshes[0]
    {
        //list< SMESH_subMesh* > meshedSM[4]; --> all sub-shapes are added to occgeoComm
        aMesher.PrepareOCCgeometry( occgeoComm, aShape, aMesh );//, meshedSM );

        // local size set at MESHCONST_ANALYSE step depends on
        // minh, face_maxh, grading and curvaturesafety; find minh if not set by the user
        if ( !_hypParameters || netgen::mparam.minh < DBL_MIN )
        {
            if ( !_hypParameters )
                netgen::mparam.maxh = occgeoComm.GetBoundingBox().Diam() / 3.;
            netgen::mparam.minh = aMesher.GetDefaultMinSize( aShape, netgen::mparam.maxh );
        }
        // set local size depending on curvature and NOT closeness of EDGEs
        netgen::occparam.resthcloseedgeenable = false;
        //netgen::occparam.resthcloseedgefac = 1.0 + netgen::mparam.grading;
        occgeoComm.face_maxh = netgen::mparam.maxh;
        netgen::OCCSetLocalMeshSize( occgeoComm, *ngMeshes[0] );
        occgeoComm.emap.Clear();
        occgeoComm.vmap.Clear();

        // set local size according to size of existing segments
        const double factor = netgen::occparam.resthcloseedgefac;
        TopTools_IndexedMapOfShape edgeMap;
        TopExp::MapShapes( aMesh.GetShapeToMesh(), TopAbs_EDGE, edgeMap );
        for ( int iE = 1; iE <= edgeMap.Extent(); ++iE )
        {
            const TopoDS_Shape& edge = edgeMap( iE );
            if ( SMESH_Algo::isDegenerated( TopoDS::Edge( edge ))/* ||
           helper.IsSubShape( edge, aShape )*/)
                continue;
            SMESHDS_SubMesh* smDS = meshDS->MeshElements( edge );
            if ( !smDS ) continue;
            SMDS_ElemIteratorPtr segIt = smDS->GetElements();
            while ( segIt->more() )
            {
                const SMDS_MeshElement* seg = segIt->next();
                SMESH_TNodeXYZ n1 = seg->GetNode(0);
                SMESH_TNodeXYZ n2 = seg->GetNode(1);
                gp_XYZ p = 0.5 * ( n1 + n2 );
                netgen::Point3d pi(p.X(), p.Y(), p.Z());
                ngMeshes[0]->RestrictLocalH( pi, factor * ( n1 - n2 ).Modulus() );
            }
        }
    }
    netgen::mparam.uselocalh = toOptimize; // restore as it is used at surface optimization

    // ==================
    // Loop on all FACEs
    // ==================

    vector< const SMDS_MeshNode* > nodeVec;

    TopExp_Explorer fExp( aShape, TopAbs_FACE );
    for ( int iF = 0; fExp.More(); fExp.Next(), ++iF )
    {
        TopoDS_Face F = TopoDS::Face( fExp.Current() /*.Oriented( TopAbs_FORWARD )*/);
        int    faceID = meshDS->ShapeToIndex( F );
        SMESH_ComputeErrorPtr& faceErr = aMesh.GetSubMesh( F )->GetComputeError();

        _quadraticMesh = helper.IsQuadraticSubMesh( F );
        const bool ignoreMediumNodes = _quadraticMesh;

        // build viscous layers if required
        if ( F.Orientation() != TopAbs_FORWARD &&
                F.Orientation() != TopAbs_REVERSED )
            F.Orientation( TopAbs_FORWARD ); // avoid pb with TopAbs_INTERNAL
        SMESH_ProxyMesh::Ptr proxyMesh = StdMeshers_ViscousLayers2D::Compute( aMesh, F );
        if ( !proxyMesh )
            continue;

        // ------------------------
        // get all EDGEs of a FACE
        // ------------------------
        TSideVector wires =
            StdMeshers_FaceSide::GetFaceWires( F, aMesh, ignoreMediumNodes, faceErr, proxyMesh );
        if ( faceErr && !faceErr->IsOK() )
            continue;
        int nbWires = wires.size();
        if ( nbWires == 0 )
        {
            faceErr.reset
            ( new SMESH_ComputeError
              ( COMPERR_ALGO_FAILED, "Problem in StdMeshers_FaceSide::GetFaceWires()" ));
            continue;
        }
        if ( wires[0]->NbSegments() < 3 ) // ex: a circle with 2 segments
        {
            faceErr.reset
            ( new SMESH_ComputeError
              ( COMPERR_BAD_INPUT_MESH, SMESH_Comment("Too few segments: ")<<wires[0]->NbSegments()) );
            continue;
        }

        // ----------------------
        // compute maxh of a FACE
        // ----------------------

        if ( !_hypParameters )
        {
            double edgeLength = 0;
            if (_hypLengthFromEdges )
            {
                // compute edgeLength as an average segment length
                int nbSegments = 0;
                for ( int iW = 0; iW < nbWires; ++iW )
                {
                    edgeLength += wires[ iW ]->Length();
                    nbSegments += wires[ iW ]->NbSegments();
                }
                if ( nbSegments )
                    edgeLength /= nbSegments;
                netgen::mparam.maxh = edgeLength;
            }
            else if ( isDefaultHyp )
            {
                // set edgeLength by a longest segment
                double maxSeg2 = 0;
                for ( int iW = 0; iW < nbWires; ++iW )
                {
                    const UVPtStructVec& points = wires[ iW ]->GetUVPtStruct();
                    if ( points.empty() )
                        return error( COMPERR_BAD_INPUT_MESH );
                    gp_Pnt pPrev = SMESH_TNodeXYZ( points[0].node );
                    for ( size_t i = 1; i < points.size(); ++i )
                    {
                        gp_Pnt p = SMESH_TNodeXYZ( points[i].node );
                        maxSeg2 = Max( maxSeg2, p.SquareDistance( pPrev ));
                        pPrev = p;
                    }
                }
                edgeLength = sqrt( maxSeg2 ) * 1.05;
                netgen::mparam.maxh = edgeLength;
            }
            if ( netgen::mparam.maxh < DBL_MIN )
                netgen::mparam.maxh = occgeoComm.GetBoundingBox().Diam();

            if ( !isCommonLocalSize )
            {
                netgen::mparam.minh = aMesher.GetDefaultMinSize( F, netgen::mparam.maxh );
            }
        }

        // prepare occgeom
        netgen::OCCGeometry occgeom;
        occgeom.shape = F;
        occgeom.fmap.Add( F );
        occgeom.CalcBoundingBox();
        occgeom.facemeshstatus.SetSize(1);
        occgeom.facemeshstatus = 0;
        occgeom.face_maxh_modified.SetSize(1);
        occgeom.face_maxh_modified = 0;
        occgeom.face_maxh.SetSize(1);
        occgeom.face_maxh = netgen::mparam.maxh;

        // -------------------------
        // Fill netgen mesh
        // -------------------------

        // MESHCONST_ANALYSE step may lead to a failure, so we make an attempt
        // w/o MESHCONST_ANALYSE at the second loop
        int err = 0;
        enum { LOC_SIZE, NO_LOC_SIZE };
        int iLoop = isCommonLocalSize ? 0 : 1;
        for ( ; iLoop < 2; iLoop++ )
        {
            //bool isMESHCONST_ANALYSE = false;
            InitComputeError();

            netgen::Mesh * ngMesh = ngMeshes[ iLoop ];
            ngMesh->DeleteMesh();

            if ( iLoop == NO_LOC_SIZE )
            {
                ngMesh->SetGlobalH ( mparam.maxh );
                ngMesh->SetMinimalH( mparam.minh );
                Box<3> bb = occgeom.GetBoundingBox();
                bb.Increase (bb.Diam()/10);
                ngMesh->SetLocalH (bb.PMin(), bb.PMax(), mparam.grading);
            }

            nodeVec.clear();
            faceErr = aMesher.AddSegmentsToMesh( *ngMesh, occgeom, wires, helper, nodeVec,
                                                 /*overrideMinH=*/!_hypParameters);
            if ( faceErr && !faceErr->IsOK() )
                break;

            //if ( !isCommonLocalSize )
            //limitSize( ngMesh, mparam.maxh * 0.8);

            // -------------------------
            // Generate surface mesh
            // -------------------------

            const int startWith = MESHCONST_MESHSURFACE;
            const int endWith   = toOptimize ? MESHCONST_OPTSURFACE : MESHCONST_MESHSURFACE;

            SMESH_Comment str;
            try {
                OCC_CATCH_SIGNALS;

#if NETGEN_VERSION >=6
                std::shared_ptr<netgen::Mesh> mesh_ptr(ngMesh,  [](netgen::Mesh*) {});
                err = netgen::OCCGenerateMesh(occgeom, mesh_ptr, netgen::mparam, startWith, endWith);
#elif NETGEN_VERSION > 4
                err = netgen::OCCGenerateMesh(occgeom, ngMesh, netgen::mparam, startWith, endWith);
#else
                char *optstr = 0;
                err = netgen::OCCGenerateMesh(occgeom, ngMesh, startWith, endWith, optstr);
#endif
                if ( netgen::multithread.terminate )
                    return false;
                if ( err )
                    str << "Error in netgen::OCCGenerateMesh() at " << netgen::multithread.task;
            }
            catch (Standard_Failure& ex)
            {
                err = 1;
                str << "Exception in  netgen::OCCGenerateMesh()"
                    << " at " << netgen::multithread.task
                    << ": " << ex.DynamicType()->Name();
                if ( ex.GetMessageString() && strlen( ex.GetMessageString() ))
                    str << ": " << ex.GetMessageString();
            }
            catch (...) {
                err = 1;
                str << "Exception in  netgen::OCCGenerateMesh()"
                    << " at " << netgen::multithread.task;
            }
            if ( err )
            {
                if ( aMesher.FixFaceMesh( occgeom, *ngMesh, 1 ))
                    break;
                if ( iLoop == LOC_SIZE )
                {
                    netgen::mparam.minh = netgen::mparam.maxh;
                    netgen::mparam.maxh = 0;
                    for ( int iW = 0; iW < wires.size(); ++iW )
                    {
                        StdMeshers_FaceSidePtr wire = wires[ iW ];
                        const vector<UVPtStruct>& uvPtVec = wire->GetUVPtStruct();
                        for ( size_t iP = 1; iP < uvPtVec.size(); ++iP )
                        {
                            SMESH_TNodeXYZ   p( uvPtVec[ iP ].node );
                            netgen::Point3d np( p.X(),p.Y(),p.Z());
                            double segLen = p.Distance( uvPtVec[ iP-1 ].node );
                            double   size = ngMesh->GetH( np );
                            netgen::mparam.minh = Min( netgen::mparam.minh, size );
                            netgen::mparam.maxh = Max( netgen::mparam.maxh, segLen );
                        }
                    }
                    //cerr << "min " << netgen::mparam.minh << " max " << netgen::mparam.maxh << endl;
                    netgen::mparam.minh *= 0.9;
                    netgen::mparam.maxh *= 1.1;
                    continue;
                }
                else
                {
                    faceErr.reset( new SMESH_ComputeError( COMPERR_ALGO_FAILED, str ));
                }
            }


            // ----------------------------------------------------
            // Fill the SMESHDS with the generated nodes and faces
            // ----------------------------------------------------

            int nbNodes = ngMesh->GetNP();
            int nbFaces = ngMesh->GetNSE();

            int nbInputNodes = nodeVec.size()-1;
            nodeVec.resize( nbNodes+1, 0 );

            // add nodes
            for ( int ngID = nbInputNodes + 1; ngID <= nbNodes; ++ngID )
            {
                const MeshPoint& ngPoint = ngMesh->Point( ngID );
                SMDS_MeshNode * node = meshDS->AddNode(ngPoint(0), ngPoint(1), ngPoint(2));
                nodeVec[ ngID ] = node;
            }

            // create faces
            int i,j;
            vector<const SMDS_MeshNode*> nodes;
            for ( i = 1; i <= nbFaces ; ++i )
            {
                const Element2d& elem = ngMesh->SurfaceElement(i);
                nodes.resize( elem.GetNP() );
                for (j=1; j <= elem.GetNP(); ++j)
                {
                    int pind = elem.PNum(j);
                    if ( pind < 1 )
                        break;
                    nodes[ j-1 ] = nodeVec[ pind ];
                    if ( nodes[ j-1 ]->GetPosition()->GetTypeOfPosition() == SMDS_TOP_3DSPACE )
                    {
                        const PointGeomInfo& pgi = elem.GeomInfoPi(j);
                        meshDS->SetNodeOnFace( nodes[ j-1 ], faceID, pgi.u, pgi.v);
                    }
                }
                if ( j > elem.GetNP() )
                {
                    SMDS_MeshFace* face = 0;
                    if ( elem.GetType() == TRIG )
                        face = helper.AddFace(nodes[0],nodes[1],nodes[2]);
                    else
                        face = helper.AddFace(nodes[0],nodes[1],nodes[2],nodes[3]);
                }
            }

            break;
        } // two attempts
    } // loop on FACEs

    return true;
}
bool StdMeshers_Projection_3D::Evaluate(SMESH_Mesh& aMesh,
                                        const TopoDS_Shape& aShape,
                                        MapShapeNbElems& aResMap)
{
  if ( !_sourceHypo )
    return false;

  SMESH_Mesh * srcMesh = _sourceHypo->GetSourceMesh();
  SMESH_Mesh * tgtMesh = & aMesh;
  if ( !srcMesh )
    srcMesh = tgtMesh;

  // get shell from shape3D
  TopoDS_Shell srcShell, tgtShell;
  TopExp_Explorer exp( _sourceHypo->GetSource3DShape(), TopAbs_SHELL );
  int nbShell;
  for ( nbShell = 0; exp.More(); exp.Next(), ++nbShell )
    srcShell = TopoDS::Shell( exp.Current() );
  if ( nbShell != 1 )
    return error(COMPERR_BAD_SHAPE,
                 SMESH_Comment("Source shape must have 1 shell but not ") << nbShell);

  exp.Init( aShape, TopAbs_SHELL );
  for ( nbShell = 0; exp.More(); exp.Next(), ++nbShell )
    tgtShell = TopoDS::Shell( exp.Current() );
  if ( nbShell != 1 )
    return error(COMPERR_BAD_SHAPE,
                 SMESH_Comment("Target shape must have 1 shell but not ") << nbShell);

  // Check that shapes are blocks
  if ( SMESH_MesherHelper::Count( tgtShell, TopAbs_FACE , 1 ) != 6 ||
       SMESH_MesherHelper::Count( tgtShell, TopAbs_EDGE , 1 ) != 12 ||
       SMESH_MesherHelper::Count( tgtShell, TopAbs_WIRE , 1 ) != 6 )
    return error(COMPERR_BAD_SHAPE, "Target shape is not a block");
  if ( SMESH_MesherHelper::Count( srcShell, TopAbs_FACE , 1 ) != 6 ||
       SMESH_MesherHelper::Count( srcShell, TopAbs_EDGE , 1 ) != 12 ||
       SMESH_MesherHelper::Count( srcShell, TopAbs_WIRE , 1 ) != 6 )
    return error(COMPERR_BAD_SHAPE, "Source shape is not a block");

  // Assure that mesh on a source shape is computed

  SMESH_subMesh* srcSubMesh = srcMesh->GetSubMesh( _sourceHypo->GetSource3DShape() );

  if ( !srcSubMesh->IsMeshComputed() )
    return error(COMPERR_BAD_INPUT_MESH,"Source mesh not computed");


  std::vector<int> aVec(SMDSEntity_Last);
  for(int i=SMDSEntity_Node; i<SMDSEntity_Last; i++) aVec[i] = 0;

  aVec[SMDSEntity_Node] = srcSubMesh->GetSubMeshDS()->NbNodes();

  //bool quadratic = false;
  SMDS_ElemIteratorPtr elemIt = srcSubMesh->GetSubMeshDS()->GetElements();
  while ( elemIt->more() ) {
    const SMDS_MeshElement* E  = elemIt->next();
    if( E->NbNodes()==4 ) {
      aVec[SMDSEntity_Tetra]++;
    }
    else if( E->NbNodes()==5 ) {
      aVec[SMDSEntity_Pyramid]++;
    }
    else if( E->NbNodes()==6 ) {
      aVec[SMDSEntity_Penta]++;
    }
    else if( E->NbNodes()==8 ) {
      aVec[SMDSEntity_Hexa]++;
    }
    else if( E->NbNodes()==10 && E->IsQuadratic() ) {
      aVec[SMDSEntity_Quad_Tetra]++;
    }
    else if( E->NbNodes()==13 && E->IsQuadratic() ) {
      aVec[SMDSEntity_Quad_Pyramid]++;
    }
    else if( E->NbNodes()==15 && E->IsQuadratic() ) {
      aVec[SMDSEntity_Quad_Penta]++;
    }
    else if( E->NbNodes()==20 && E->IsQuadratic() ) {
      aVec[SMDSEntity_Quad_Hexa]++;
    }
    else {
      aVec[SMDSEntity_Polyhedra]++;
    }
  }

  SMESH_subMesh * sm = aMesh.GetSubMesh(aShape);
  aResMap.insert(std::make_pair(sm,aVec));

  return true;
}
Exemplo n.º 18
0
bool SMESH_MesherHelper::LoadNodeColumns(TParam2ColumnMap & theParam2ColumnMap,
                                         const TopoDS_Face& theFace,
                                         const TopoDS_Edge& theBaseEdge,
                                         SMESHDS_Mesh*      theMesh)
{
  // get vertices of theBaseEdge
  TopoDS_Vertex vfb, vlb, vft; // first and last, bottom and top vertices
  TopoDS_Edge eFrw = TopoDS::Edge( theBaseEdge.Oriented( TopAbs_FORWARD ));
  TopExp::Vertices( eFrw, vfb, vlb );

  // find the other edges of theFace and orientation of e1
  TopoDS_Edge e1, e2, eTop;
  bool rev1, CumOri = false;
  TopExp_Explorer exp( theFace, TopAbs_EDGE );
  int nbEdges = 0;
  for ( ; exp.More(); exp.Next() ) {
    if ( ++nbEdges > 4 ) {
      return false; // more than 4 edges in theFace
    }
    TopoDS_Edge e = TopoDS::Edge( exp.Current() );
    if ( theBaseEdge.IsSame( e ))
      continue;
    TopoDS_Vertex vCommon;
    if ( !TopExp::CommonVertex( theBaseEdge, e, vCommon ))
      eTop = e;
    else if ( vCommon.IsSame( vfb )) {
      e1 = e;
      vft = TopExp::LastVertex( e1, CumOri );
      rev1 = vfb.IsSame( vft );
      if ( rev1 )
        vft = TopExp::FirstVertex( e1, CumOri );
    }
    else
      e2 = e;
  }
  if ( nbEdges < 4 ) {
    return false; // less than 4 edges in theFace
  }
  if ( e2.IsNull() && vfb.IsSame( vlb ))
    e2 = e1;

  // submeshes corresponding to shapes
  SMESHDS_SubMesh* smFace = theMesh->MeshElements( theFace );
  SMESHDS_SubMesh* smb = theMesh->MeshElements( theBaseEdge );
  SMESHDS_SubMesh* smt = theMesh->MeshElements( eTop );
  SMESHDS_SubMesh* sm1 = theMesh->MeshElements( e1 );
  SMESHDS_SubMesh* sm2 = theMesh->MeshElements( e2 );
  SMESHDS_SubMesh* smVfb = theMesh->MeshElements( vfb );
  SMESHDS_SubMesh* smVlb = theMesh->MeshElements( vlb );
  SMESHDS_SubMesh* smVft = theMesh->MeshElements( vft );
  if (!smFace || !smb || !smt || !sm1 || !sm2 || !smVfb || !smVlb || !smVft ) {
    RETURN_BAD_RESULT( "NULL submesh " <<smFace<<" "<<smb<<" "<<smt<<" "<<
                       sm1<<" "<<sm2<<" "<<smVfb<<" "<<smVlb<<" "<<smVft);
  }
  if ( smb->NbNodes() != smt->NbNodes() || sm1->NbNodes() != sm2->NbNodes() ) {
    RETURN_BAD_RESULT(" Diff nb of nodes on opposite edges" );
  }
  if (smVfb->NbNodes() != 1 || smVlb->NbNodes() != 1 || smVft->NbNodes() != 1) {
    RETURN_BAD_RESULT("Empty submesh of vertex");
  }
  // define whether mesh is quadratic
  bool isQuadraticMesh = false;
  SMDS_ElemIteratorPtr eIt = smFace->GetElements();
  if ( !eIt->more() ) {
    RETURN_BAD_RESULT("No elements on the face");
  }
  const SMDS_MeshElement* e = eIt->next();
  isQuadraticMesh = e->IsQuadratic();
  
  if ( sm1->NbNodes() * smb->NbNodes() != smFace->NbNodes() ) {
    // check quadratic case
    if ( isQuadraticMesh ) {
      // what if there are quadrangles and triangles mixed?
//       int n1 = sm1->NbNodes()/2;
//       int n2 = smb->NbNodes()/2;
//       int n3 = sm1->NbNodes() - n1;
//       int n4 = smb->NbNodes() - n2;
//       int nf = sm1->NbNodes()*smb->NbNodes() - n3*n4;
//       if( nf != smFace->NbNodes() ) {
//         MESSAGE( "Wrong nb face nodes: " <<
//                 sm1->NbNodes()<<" "<<smb->NbNodes()<<" "<<smFace->NbNodes());
//         return false;
//       }
    }
    else {
      RETURN_BAD_RESULT( "Wrong nb face nodes: " <<
                         sm1->NbNodes()<<" "<<smb->NbNodes()<<" "<<smFace->NbNodes());
    }
  }
  // IJ size
  int vsize = sm1->NbNodes() + 2;
  int hsize = smb->NbNodes() + 2;
  if(isQuadraticMesh) {
    vsize = vsize - sm1->NbNodes()/2 -1;
    hsize = hsize - smb->NbNodes()/2 -1;
  }

  // load nodes from theBaseEdge

  std::set<const SMDS_MeshNode*> loadedNodes;
  const SMDS_MeshNode* nullNode = 0;

  std::vector<const SMDS_MeshNode*> & nVecf = theParam2ColumnMap[ 0.];
  nVecf.resize( vsize, nullNode );
  loadedNodes.insert( nVecf[ 0 ] = smVfb->GetNodes()->next() );

  std::vector<const SMDS_MeshNode*> & nVecl = theParam2ColumnMap[ 1.];
  nVecl.resize( vsize, nullNode );
  loadedNodes.insert( nVecl[ 0 ] = smVlb->GetNodes()->next() );

  double f, l;
  BRep_Tool::Range( eFrw, f, l );
  double range = l - f;
  SMDS_NodeIteratorPtr nIt = smb->GetNodes();
  const SMDS_MeshNode* node;
  while ( nIt->more() ) {
    node = nIt->next();
    if(IsMedium(node, SMDSAbs_Edge))
      continue;
    const SMDS_EdgePosition* pos =
      dynamic_cast<const SMDS_EdgePosition*>( node->GetPosition().get() );
    if ( !pos ) {
      return false;
    }
    double u = ( pos->GetUParameter() - f ) / range;
    std::vector<const SMDS_MeshNode*> & nVec = theParam2ColumnMap[ u ];
    nVec.resize( vsize, nullNode );
    loadedNodes.insert( nVec[ 0 ] = node );
  }
  if ( theParam2ColumnMap.size() != hsize ) {
    RETURN_BAD_RESULT( "Wrong node positions on theBaseEdge" );
  }

  // load nodes from e1

  std::map< double, const SMDS_MeshNode*> sortedNodes; // sort by param on edge
  nIt = sm1->GetNodes();
  while ( nIt->more() ) {
    node = nIt->next();
    if(IsMedium(node))
      continue;
    const SMDS_EdgePosition* pos =
      dynamic_cast<const SMDS_EdgePosition*>( node->GetPosition().get() );
    if ( !pos ) {
      return false;
    }
    sortedNodes.insert( std::make_pair( pos->GetUParameter(), node ));
  }
  loadedNodes.insert( nVecf[ vsize - 1 ] = smVft->GetNodes()->next() );
  std::map< double, const SMDS_MeshNode*>::iterator u_n = sortedNodes.begin();
  int row  = rev1 ? vsize - 1 : 0;
  int dRow = rev1 ? -1 : +1;
  for ( ; u_n != sortedNodes.end(); u_n++ ) {
    row += dRow;
    loadedNodes.insert( nVecf[ row ] = u_n->second );
  }

  // try to load the rest nodes

  // get all faces from theFace
  TIDSortedElemSet allFaces, foundFaces;
  eIt = smFace->GetElements();
  while ( eIt->more() ) {
    const SMDS_MeshElement* e = eIt->next();
    if ( e->GetType() == SMDSAbs_Face )
      allFaces.insert( e );
  }
  // Starting from 2 neighbour nodes on theBaseEdge, look for a face
  // the nodes belong to, and between the nodes of the found face,
  // look for a not loaded node considering this node to be the next
  // in a column of the starting second node. Repeat, starting
  // from nodes next to the previous starting nodes in their columns,
  // and so on while a face can be found. Then go the the next pair
  // of nodes on theBaseEdge.
  TParam2ColumnMap::iterator par_nVec_1 = theParam2ColumnMap.begin();
  TParam2ColumnMap::iterator par_nVec_2 = par_nVec_1;
  // loop on columns
  int col = 0;
  for ( par_nVec_2++; par_nVec_2 != theParam2ColumnMap.end(); par_nVec_1++, par_nVec_2++ ) {
    col++;
    row = 0;
    const SMDS_MeshNode* n1 = par_nVec_1->second[ row ];
    const SMDS_MeshNode* n2 = par_nVec_2->second[ row ];
    const SMDS_MeshElement* face = 0;
    bool lastColOnClosedFace = ( nVecf[ row ] == n2 );
    do {
      // look for a face by 2 nodes
      face = SMESH_MeshEditor::FindFaceInSet( n1, n2, allFaces, foundFaces );
      if ( face ) {
        int nbFaceNodes = face->NbNodes();
        if ( face->IsQuadratic() )
          nbFaceNodes /= 2;
        if ( nbFaceNodes>4 ) {
          RETURN_BAD_RESULT(" Too many nodes in a face: " << nbFaceNodes );
        }
        // look for a not loaded node of the <face>
        bool found = false;
        const SMDS_MeshNode* n3 = 0; // a node defferent from n1 and n2
        for ( int i = 0; i < nbFaceNodes && !found; ++i ) {
          node = face->GetNode( i );
          found = loadedNodes.insert( node ).second;
          if ( !found && node != n1 && node != n2 )
            n3 = node;
        }
        if ( lastColOnClosedFace && row + 1 < vsize ) {
          node = nVecf[ row + 1 ];
          found = ( face->GetNodeIndex( node ) >= 0 );
        }
        if ( found ) {
          if ( ++row > vsize - 1 ) {
            RETURN_BAD_RESULT( "Too many nodes in column "<< col <<": "<< row+1);
          }
          par_nVec_2->second[ row ] = node;
          foundFaces.insert( face );
          n2 = node;
          if ( nbFaceNodes==4 ) {
            n1 = par_nVec_1->second[ row ];
          }
        }
        else if ( nbFaceNodes==3 && n3 == par_nVec_1->second[ row + 1 ] ) {
          n1 = n3;
        }
        else  {
          RETURN_BAD_RESULT( "Not quad mesh, column "<< col );
        }
      }
    }
    while ( face && n1 && n2 );

    if ( row < vsize - 1 ) {
      MESSAGE( "Too few nodes in column "<< col <<": "<< row+1);
      MESSAGE( "Base node 1: "<< par_nVec_1->second[0]);
      MESSAGE( "Base node 2: "<< par_nVec_2->second[0]);
      if ( n1 ) { MESSAGE( "Current node 1: "<< n1); }
      else      { MESSAGE( "Current node 1: NULL");  }
      if ( n2 ) { MESSAGE( "Current node 2: "<< n2); }
      else      { MESSAGE( "Current node 2: NULL");  }
      MESSAGE( "first base node: "<< theParam2ColumnMap.begin()->second[0]);
      MESSAGE( "last base node: "<< theParam2ColumnMap.rbegin()->second[0]);
      return false;
    }
  } // loop on columns

  return true;
}
bool StdMeshers_Hexa_3D::Compute(SMESH_Mesh &         aMesh,
                                 const TopoDS_Shape & aShape)// throw(SALOME_Exception)
{
  // PAL14921. Enable catching std::bad_alloc and Standard_OutOfMemory outside
  //Unexpect aCatch(SalomeException);
  MESSAGE("StdMeshers_Hexa_3D::Compute");
  SMESHDS_Mesh * meshDS = aMesh.GetMeshDS();

  // 0.  - shape and face mesh verification
  // 0.1 - shape must be a solid (or a shell) with 6 faces

  vector < SMESH_subMesh * >meshFaces;
  for (TopExp_Explorer exp(aShape, TopAbs_FACE); exp.More(); exp.Next()) {
    SMESH_subMesh *aSubMesh = aMesh.GetSubMeshContaining(exp.Current());
    ASSERT(aSubMesh);
    meshFaces.push_back(aSubMesh);
  }
  if (meshFaces.size() != 6) {
    //return error(COMPERR_BAD_SHAPE, TComm(meshFaces.size())<<" instead of 6 faces in a block");
    static StdMeshers_CompositeHexa_3D compositeHexa(-10, 0, aMesh.GetGen());
    if ( !compositeHexa.Compute( aMesh, aShape ))
      return error( compositeHexa.GetComputeError() );
    return true;
  }

  // 0.2 - is each face meshed with Quadrangle_2D? (so, with a wire of 4 edges)

  // tool for working with quadratic elements
  SMESH_MesherHelper aTool (aMesh);
  _quadraticMesh = aTool.IsQuadraticSubMesh(aShape);

  // cube structure
  typedef struct cubeStruct
  {
    TopoDS_Vertex V000;
    TopoDS_Vertex V001;
    TopoDS_Vertex V010;
    TopoDS_Vertex V011;
    TopoDS_Vertex V100;
    TopoDS_Vertex V101;
    TopoDS_Vertex V110;
    TopoDS_Vertex V111;
    faceQuadStruct* quad_X0;
    faceQuadStruct* quad_X1;
    faceQuadStruct* quad_Y0;
    faceQuadStruct* quad_Y1;
    faceQuadStruct* quad_Z0;
    faceQuadStruct* quad_Z1;
    Point3DStruct* np; // normalised 3D coordinates
  } CubeStruct;

  CubeStruct aCube;

  // bounding faces
  FaceQuadStruct* aQuads[6];
  for (int i = 0; i < 6; i++)
    aQuads[i] = 0;

  for (int i = 0; i < 6; i++)
  {
    TopoDS_Shape aFace = meshFaces[i]->GetSubShape();
    SMESH_Algo *algo = _gen->GetAlgo(aMesh, aFace);
    string algoName = algo->GetName();
    bool isAllQuad = false;
    if (algoName == "Quadrangle_2D") {
      SMESHDS_SubMesh * sm = meshDS->MeshElements( aFace );
      if ( sm ) {
        isAllQuad = true;
        SMDS_ElemIteratorPtr eIt = sm->GetElements();
        while ( isAllQuad && eIt->more() ) {
          const SMDS_MeshElement* elem =  eIt->next();
          isAllQuad = ( elem->NbNodes()==4 ||(_quadraticMesh && elem->NbNodes()==8) );
        }
      }
    }
    if ( ! isAllQuad ) {
      SMESH_ComputeErrorPtr err = ComputePentahedralMesh(aMesh, aShape);
      return ClearAndReturn( aQuads, error(err));
    }
    StdMeshers_Quadrangle_2D *quadAlgo =
      dynamic_cast < StdMeshers_Quadrangle_2D * >(algo);
    ASSERT(quadAlgo);
    try {
      aQuads[i] = quadAlgo->CheckAnd2Dcompute(aMesh, aFace, _quadraticMesh);
      if(!aQuads[i]) {
        return error( quadAlgo->GetComputeError());
      }
    }
    catch(SALOME_Exception & S_ex) {
      return ClearAndReturn( aQuads, error(COMPERR_SLM_EXCEPTION,TComm(S_ex.what()) <<
                                           " Raised by StdMeshers_Quadrangle_2D "
                                           " on face #" << meshDS->ShapeToIndex( aFace )));
    }

    // 0.2.1 - number of points on the opposite edges must be the same
    if (aQuads[i]->side[0]->NbPoints() != aQuads[i]->side[2]->NbPoints() ||
        aQuads[i]->side[1]->NbPoints() != aQuads[i]->side[3]->NbPoints()
        /*aQuads[i]->side[0]->NbEdges() != 1 ||
        aQuads[i]->side[1]->NbEdges() != 1 ||
        aQuads[i]->side[2]->NbEdges() != 1 ||
        aQuads[i]->side[3]->NbEdges() != 1*/) {
      MESSAGE("different number of points on the opposite edges of face " << i);
      // Try to go into penta algorithm 'cause it has been improved.
      SMESH_ComputeErrorPtr err = ComputePentahedralMesh(aMesh, aShape);
      return ClearAndReturn( aQuads, error(err));
    }
  }

  // 1.  - identify faces and vertices of the "cube"
  // 1.1 - ancestor maps vertex->edges in the cube

//   TopTools_IndexedDataMapOfShapeListOfShape MS;
//   TopExp::MapShapesAndAncestors(aShape, TopAbs_VERTEX, TopAbs_EDGE, MS);

  // 1.2 - first face is choosen as face Y=0 of the unit cube

  const TopoDS_Shape & aFace = meshFaces[0]->GetSubShape();
  //const TopoDS_Face & F = TopoDS::Face(aFace);

  // 1.3 - identify the 4 vertices of the face Y=0: V000, V100, V101, V001

  aCube.V000 = aQuads[0]->side[0]->FirstVertex(); // will be (0,0,0) on the unit cube
  aCube.V100 = aQuads[0]->side[0]->LastVertex();  // will be (1,0,0) on the unit cube
  aCube.V001 = aQuads[0]->side[2]->FirstVertex(); // will be (0,0,1) on the unit cube
  aCube.V101 = aQuads[0]->side[2]->LastVertex();  // will be (1,0,1) on the unit cube

  TopTools_IndexedMapOfShape MV0;
  TopExp::MapShapes(aFace, TopAbs_VERTEX, MV0);

  aCube.V010 = OppositeVertex( aCube.V000, MV0, aQuads);
  aCube.V110 = OppositeVertex( aCube.V100, MV0, aQuads);
  aCube.V011 = OppositeVertex( aCube.V001, MV0, aQuads);
  aCube.V111 = OppositeVertex( aCube.V101, MV0, aQuads);

  // 1.6 - find remaining faces given 4 vertices

  int _indY0 = 0;
  int _indY1 = GetFaceIndex(aMesh, aShape, meshFaces,
                            aCube.V010, aCube.V011, aCube.V110, aCube.V111);
  int _indZ0 = GetFaceIndex(aMesh, aShape, meshFaces,
                            aCube.V000, aCube.V010, aCube.V100, aCube.V110);
  int _indZ1 = GetFaceIndex(aMesh, aShape, meshFaces,
                            aCube.V001, aCube.V011, aCube.V101, aCube.V111);
  int _indX0 = GetFaceIndex(aMesh, aShape, meshFaces,
                            aCube.V000, aCube.V001, aCube.V010, aCube.V011);
  int _indX1 = GetFaceIndex(aMesh, aShape, meshFaces,
                            aCube.V100, aCube.V101, aCube.V110, aCube.V111);

  // IPAL21120: SIGSEGV on Meshing attached Compound with Automatic Hexadralization
  if ( _indY1 < 1 || _indZ0 < 1 || _indZ1 < 1 || _indX0 < 1 || _indX1 < 1 )
    return error(COMPERR_BAD_SHAPE);

  aCube.quad_Y0 = aQuads[_indY0];
  aCube.quad_Y1 = aQuads[_indY1];
  aCube.quad_Z0 = aQuads[_indZ0];
  aCube.quad_Z1 = aQuads[_indZ1];
  aCube.quad_X0 = aQuads[_indX0];
  aCube.quad_X1 = aQuads[_indX1];

  // 1.7 - get convertion coefs from face 2D normalized to 3D normalized

  Conv2DStruct cx0;                     // for face X=0
  Conv2DStruct cx1;                     // for face X=1
  Conv2DStruct cy0;
  Conv2DStruct cy1;
  Conv2DStruct cz0;
  Conv2DStruct cz1;

  GetConv2DCoefs(*aCube.quad_X0, meshFaces[_indX0]->GetSubShape(),
                 aCube.V000, aCube.V010, aCube.V011, aCube.V001, cx0);
  GetConv2DCoefs(*aCube.quad_X1, meshFaces[_indX1]->GetSubShape(),
                 aCube.V100, aCube.V110, aCube.V111, aCube.V101, cx1);
  GetConv2DCoefs(*aCube.quad_Y0, meshFaces[_indY0]->GetSubShape(),
                 aCube.V000, aCube.V100, aCube.V101, aCube.V001, cy0);
  GetConv2DCoefs(*aCube.quad_Y1, meshFaces[_indY1]->GetSubShape(),
                 aCube.V010, aCube.V110, aCube.V111, aCube.V011, cy1);
  GetConv2DCoefs(*aCube.quad_Z0, meshFaces[_indZ0]->GetSubShape(),
                 aCube.V000, aCube.V100, aCube.V110, aCube.V010, cz0);
  GetConv2DCoefs(*aCube.quad_Z1, meshFaces[_indZ1]->GetSubShape(),
                 aCube.V001, aCube.V101, aCube.V111, aCube.V011, cz1);

  // 1.8 - create a 3D structure for normalized values
  
  int nbx = aCube.quad_Z0->side[0]->NbPoints();
  if (cz0.a1 == 0.) nbx = aCube.quad_Z0->side[1]->NbPoints();
 
  int nby = aCube.quad_X0->side[0]->NbPoints();
  if (cx0.a1 == 0.) nby = aCube.quad_X0->side[1]->NbPoints();
 
  int nbz = aCube.quad_Y0->side[0]->NbPoints();
  if (cy0.a1 != 0.) nbz = aCube.quad_Y0->side[1]->NbPoints();

  int i1, j1, nbxyz = nbx * nby * nbz;
  Point3DStruct *np = new Point3DStruct[nbxyz];

  // 1.9 - store node indexes of faces

  {
    const TopoDS_Face & F = TopoDS::Face(meshFaces[_indX0]->GetSubShape());

    faceQuadStruct *quad = aCube.quad_X0;
    int i = 0;                          // j = x/face , k = y/face
    int nbdown = quad->side[0]->NbPoints();
    int nbright = quad->side[1]->NbPoints();

    SMDS_NodeIteratorPtr itf= aMesh.GetSubMesh(F)->GetSubMeshDS()->GetNodes();
                        
    while(itf->more()) {
      const SMDS_MeshNode * node = itf->next();
      if(aTool.IsMedium(node))
        continue;
      if ( !findIJ( node, quad, i1, j1 ))
        return ClearAndReturn( aQuads, false );
      int ij1 = j1 * nbdown + i1;
      quad->uv_grid[ij1].node = node;
    }

    for (int i1 = 0; i1 < nbdown; i1++)
      for (int j1 = 0; j1 < nbright; j1++) {
        int ij1 = j1 * nbdown + i1;
        int j = cx0.ia * i1 + cx0.ib * j1 + cx0.ic;     // j = x/face
        int k = cx0.ja * i1 + cx0.jb * j1 + cx0.jc;     // k = y/face
        int ijk = k * nbx * nby + j * nbx + i;
        //MESSAGE(" "<<ij1<<" "<<i<<" "<<j<<" "<<ijk);
        np[ijk].node = quad->uv_grid[ij1].node;
        //SCRUTE(np[ijk].nodeId);
      }
  }

  {
    const TopoDS_Face & F = TopoDS::Face(meshFaces[_indX1]->GetSubShape());

    SMDS_NodeIteratorPtr itf= aMesh.GetSubMesh(F)->GetSubMeshDS()->GetNodes();

    faceQuadStruct *quad = aCube.quad_X1;
    int i = nbx - 1;            // j = x/face , k = y/face
    int nbdown = quad->side[0]->NbPoints();
    int nbright = quad->side[1]->NbPoints();

    while(itf->more()) {
      const SMDS_MeshNode * node = itf->next();
      if(aTool.IsMedium(node))
        continue;
      if ( !findIJ( node, quad, i1, j1 ))
        return ClearAndReturn( aQuads, false );
      int ij1 = j1 * nbdown + i1;
      quad->uv_grid[ij1].node = node;
    }

    for (int i1 = 0; i1 < nbdown; i1++)
      for (int j1 = 0; j1 < nbright; j1++) {
        int ij1 = j1 * nbdown + i1;
        int j = cx1.ia * i1 + cx1.ib * j1 + cx1.ic;     // j = x/face
        int k = cx1.ja * i1 + cx1.jb * j1 + cx1.jc;     // k = y/face
        int ijk = k * nbx * nby + j * nbx + i;
        //MESSAGE(" "<<ij1<<" "<<i<<" "<<j<<" "<<ijk);
        np[ijk].node = quad->uv_grid[ij1].node;
        //SCRUTE(np[ijk].nodeId);
      }
  }

  {
    const TopoDS_Face & F = TopoDS::Face(meshFaces[_indY0]->GetSubShape());

    SMDS_NodeIteratorPtr itf= aMesh.GetSubMesh(F)->GetSubMeshDS()->GetNodes();

    faceQuadStruct *quad = aCube.quad_Y0;
    int j = 0;                          // i = x/face , k = y/face
    int nbdown = quad->side[0]->NbPoints();
    int nbright = quad->side[1]->NbPoints();

    while(itf->more()) {
      const SMDS_MeshNode * node = itf->next();
      if(aTool.IsMedium(node))
        continue;
      if ( !findIJ( node, quad, i1, j1 ))
        return ClearAndReturn( aQuads, false );
      int ij1 = j1 * nbdown + i1;
      quad->uv_grid[ij1].node = node;
    }

    for (int i1 = 0; i1 < nbdown; i1++)
      for (int j1 = 0; j1 < nbright; j1++) {
        int ij1 = j1 * nbdown + i1;
        int i = cy0.ia * i1 + cy0.ib * j1 + cy0.ic;     // i = x/face
        int k = cy0.ja * i1 + cy0.jb * j1 + cy0.jc;     // k = y/face
        int ijk = k * nbx * nby + j * nbx + i;
        //MESSAGE(" "<<ij1<<" "<<i<<" "<<j<<" "<<ijk);
        np[ijk].node = quad->uv_grid[ij1].node;
        //SCRUTE(np[ijk].nodeId);
      }
  }

  {
    const TopoDS_Face & F = TopoDS::Face(meshFaces[_indY1]->GetSubShape());

    SMDS_NodeIteratorPtr itf= aMesh.GetSubMesh(F)->GetSubMeshDS()->GetNodes();

    faceQuadStruct *quad = aCube.quad_Y1;
    int j = nby - 1;            // i = x/face , k = y/face
    int nbdown = quad->side[0]->NbPoints();
    int nbright = quad->side[1]->NbPoints();

    while(itf->more()) {
      const SMDS_MeshNode * node = itf->next();
      if(aTool.IsMedium(node))
        continue;
      if ( !findIJ( node, quad, i1, j1 ))
        return ClearAndReturn( aQuads, false );
      int ij1 = j1 * nbdown + i1;
      quad->uv_grid[ij1].node = node;
    }

    for (int i1 = 0; i1 < nbdown; i1++)
      for (int j1 = 0; j1 < nbright; j1++) {
        int ij1 = j1 * nbdown + i1;
        int i = cy1.ia * i1 + cy1.ib * j1 + cy1.ic;     // i = x/face
        int k = cy1.ja * i1 + cy1.jb * j1 + cy1.jc;     // k = y/face
        int ijk = k * nbx * nby + j * nbx + i;
        //MESSAGE(" "<<ij1<<" "<<i<<" "<<j<<" "<<ijk);
        np[ijk].node = quad->uv_grid[ij1].node;
        //SCRUTE(np[ijk].nodeId);
      }
  }

  {
    const TopoDS_Face & F = TopoDS::Face(meshFaces[_indZ0]->GetSubShape());

    SMDS_NodeIteratorPtr itf= aMesh.GetSubMesh(F)->GetSubMeshDS()->GetNodes();

    faceQuadStruct *quad = aCube.quad_Z0;
    int k = 0;                          // i = x/face , j = y/face
    int nbdown = quad->side[0]->NbPoints();
    int nbright = quad->side[1]->NbPoints();

    while(itf->more()) {
      const SMDS_MeshNode * node = itf->next();
      if(aTool.IsMedium(node))
        continue;
      if ( !findIJ( node, quad, i1, j1 ))
        return ClearAndReturn( aQuads, false );
      int ij1 = j1 * nbdown + i1;
      quad->uv_grid[ij1].node = node;
    }

    for (int i1 = 0; i1 < nbdown; i1++)
      for (int j1 = 0; j1 < nbright; j1++) {
        int ij1 = j1 * nbdown + i1;
        int i = cz0.ia * i1 + cz0.ib * j1 + cz0.ic;     // i = x/face
        int j = cz0.ja * i1 + cz0.jb * j1 + cz0.jc;     // j = y/face
        int ijk = k * nbx * nby + j * nbx + i;
        //MESSAGE(" "<<ij1<<" "<<i<<" "<<j<<" "<<ijk);
        np[ijk].node = quad->uv_grid[ij1].node;
        //SCRUTE(np[ijk].nodeId);
      }
  }

  {
    const TopoDS_Face & F = TopoDS::Face(meshFaces[_indZ1]->GetSubShape());

    SMDS_NodeIteratorPtr itf= aMesh.GetSubMesh(F)->GetSubMeshDS()->GetNodes();

    faceQuadStruct *quad = aCube.quad_Z1;
    int k = nbz - 1;            // i = x/face , j = y/face
    int nbdown = quad->side[0]->NbPoints();
    int nbright = quad->side[1]->NbPoints();
    
    while(itf->more()) {
      const SMDS_MeshNode * node = itf->next();
      if(aTool.IsMedium(node))
        continue;
      if ( !findIJ( node, quad, i1, j1 ))
        return ClearAndReturn( aQuads, false );
      int ij1 = j1 * nbdown + i1;
      quad->uv_grid[ij1].node = node;
    }

    for (int i1 = 0; i1 < nbdown; i1++)
      for (int j1 = 0; j1 < nbright; j1++) {
        int ij1 = j1 * nbdown + i1;
        int i = cz1.ia * i1 + cz1.ib * j1 + cz1.ic;     // i = x/face
        int j = cz1.ja * i1 + cz1.jb * j1 + cz1.jc;     // j = y/face
        int ijk = k * nbx * nby + j * nbx + i;
        //MESSAGE(" "<<ij1<<" "<<i<<" "<<j<<" "<<ijk);
        np[ijk].node = quad->uv_grid[ij1].node;
        //SCRUTE(np[ijk].nodeId);
      }
  }

  // 2.0 - for each node of the cube:
  //       - get the 8 points 3D = 8 vertices of the cube
  //       - get the 12 points 3D on the 12 edges of the cube
  //       - get the 6 points 3D on the 6 faces with their ID
  //       - compute the point 3D
  //       - store the point 3D in SMESHDS, store its ID in 3D structure

  int shapeID = meshDS->ShapeToIndex( aShape );

  Pt3 p000, p001, p010, p011, p100, p101, p110, p111;
  Pt3 px00, px01, px10, px11;
  Pt3 p0y0, p0y1, p1y0, p1y1;
  Pt3 p00z, p01z, p10z, p11z;
  Pt3 pxy0, pxy1, px0z, px1z, p0yz, p1yz;

  GetPoint(p000, 0, 0, 0, nbx, nby, nbz, np, meshDS);
  GetPoint(p001, 0, 0, nbz - 1, nbx, nby, nbz, np, meshDS);
  GetPoint(p010, 0, nby - 1, 0, nbx, nby, nbz, np, meshDS);
  GetPoint(p011, 0, nby - 1, nbz - 1, nbx, nby, nbz, np, meshDS);
  GetPoint(p100, nbx - 1, 0, 0, nbx, nby, nbz, np, meshDS);
  GetPoint(p101, nbx - 1, 0, nbz - 1, nbx, nby, nbz, np, meshDS);
  GetPoint(p110, nbx - 1, nby - 1, 0, nbx, nby, nbz, np, meshDS);
  GetPoint(p111, nbx - 1, nby - 1, nbz - 1, nbx, nby, nbz, np, meshDS);

  for (int i = 1; i < nbx - 1; i++) {
    for (int j = 1; j < nby - 1; j++) {
      for (int k = 1; k < nbz - 1; k++) {
        // *** seulement maillage regulier
        // 12 points on edges
        GetPoint(px00, i, 0, 0, nbx, nby, nbz, np, meshDS);
        GetPoint(px01, i, 0, nbz - 1, nbx, nby, nbz, np, meshDS);
        GetPoint(px10, i, nby - 1, 0, nbx, nby, nbz, np, meshDS);
        GetPoint(px11, i, nby - 1, nbz - 1, nbx, nby, nbz, np, meshDS);

        GetPoint(p0y0, 0, j, 0, nbx, nby, nbz, np, meshDS);
        GetPoint(p0y1, 0, j, nbz - 1, nbx, nby, nbz, np, meshDS);
        GetPoint(p1y0, nbx - 1, j, 0, nbx, nby, nbz, np, meshDS);
        GetPoint(p1y1, nbx - 1, j, nbz - 1, nbx, nby, nbz, np, meshDS);

        GetPoint(p00z, 0, 0, k, nbx, nby, nbz, np, meshDS);
        GetPoint(p01z, 0, nby - 1, k, nbx, nby, nbz, np, meshDS);
        GetPoint(p10z, nbx - 1, 0, k, nbx, nby, nbz, np, meshDS);
        GetPoint(p11z, nbx - 1, nby - 1, k, nbx, nby, nbz, np, meshDS);

        // 12 points on faces
        GetPoint(pxy0, i, j, 0, nbx, nby, nbz, np, meshDS);
        GetPoint(pxy1, i, j, nbz - 1, nbx, nby, nbz, np, meshDS);
        GetPoint(px0z, i, 0, k, nbx, nby, nbz, np, meshDS);
        GetPoint(px1z, i, nby - 1, k, nbx, nby, nbz, np, meshDS);
        GetPoint(p0yz, 0, j, k, nbx, nby, nbz, np, meshDS);
        GetPoint(p1yz, nbx - 1, j, k, nbx, nby, nbz, np, meshDS);

        int ijk = k * nbx * nby + j * nbx + i;
        double x = double (i) / double (nbx - 1);       // *** seulement
        double y = double (j) / double (nby - 1);       // *** maillage
        double z = double (k) / double (nbz - 1);       // *** regulier

        Pt3 X;
        for (int i = 0; i < 3; i++) {
          X[i] = (1 - x) * p0yz[i] + x * p1yz[i]
                 + (1 - y) * px0z[i] + y * px1z[i]
                 + (1 - z) * pxy0[i] + z * pxy1[i]
                 - (1 - x) * ((1 - y) * p00z[i] + y * p01z[i])
                 - x * ((1 - y) * p10z[i] + y * p11z[i])
                 - (1 - y) * ((1 - z) * px00[i] + z * px01[i])
                 - y * ((1 - z) * px10[i] + z * px11[i])
                 - (1 - z) * ((1 - x) * p0y0[i] + x * p1y0[i])
                 - z * ((1 - x) * p0y1[i] + x * p1y1[i])
                 + (1 - x) * ((1 - y) * ((1 - z) * p000[i] + z * p001[i])
                 + y * ((1 - z) * p010[i] + z * p011[i]))
                 + x * ((1 - y) * ((1 - z) * p100[i] + z * p101[i])
                 + y * ((1 - z) * p110[i] + z * p111[i]));
        }

        SMDS_MeshNode * node = meshDS->AddNode(X[0], X[1], X[2]);
        np[ijk].node = node;
        meshDS->SetNodeInVolume(node, shapeID);
      }
    }
  }

  // find orientation of furute volumes according to MED convention
  vector< bool > forward( nbx * nby );
  SMDS_VolumeTool vTool;
  for (int i = 0; i < nbx - 1; i++) {
    for (int j = 0; j < nby - 1; j++) {
      int n1 = j * nbx + i;
      int n2 = j * nbx + i + 1;
      int n3 = (j + 1) * nbx + i + 1;
      int n4 = (j + 1) * nbx + i;
      int n5 = nbx * nby + j * nbx + i;
      int n6 = nbx * nby + j * nbx + i + 1;
      int n7 = nbx * nby + (j + 1) * nbx + i + 1;
      int n8 = nbx * nby + (j + 1) * nbx + i;

      SMDS_VolumeOfNodes tmpVol (np[n1].node,np[n2].node,np[n3].node,np[n4].node,
                                 np[n5].node,np[n6].node,np[n7].node,np[n8].node);
      vTool.Set( &tmpVol );
      forward[ n1 ] = vTool.IsForward();
    }
  }

  //2.1 - for each node of the cube (less 3 *1 Faces):
  //      - store hexahedron in SMESHDS
  MESSAGE("Storing hexahedron into the DS");
  for (int i = 0; i < nbx - 1; i++) {
    for (int j = 0; j < nby - 1; j++) {
      bool isForw = forward.at( j * nbx + i );
      for (int k = 0; k < nbz - 1; k++) {
        int n1 = k * nbx * nby + j * nbx + i;
        int n2 = k * nbx * nby + j * nbx + i + 1;
        int n3 = k * nbx * nby + (j + 1) * nbx + i + 1;
        int n4 = k * nbx * nby + (j + 1) * nbx + i;
        int n5 = (k + 1) * nbx * nby + j * nbx + i;
        int n6 = (k + 1) * nbx * nby + j * nbx + i + 1;
        int n7 = (k + 1) * nbx * nby + (j + 1) * nbx + i + 1;
        int n8 = (k + 1) * nbx * nby + (j + 1) * nbx + i;

        SMDS_MeshVolume * elt;
        if ( isForw ) {
          elt = aTool.AddVolume(np[n1].node, np[n2].node,
                                np[n3].node, np[n4].node,
                                np[n5].node, np[n6].node,
                                np[n7].node, np[n8].node);
        }
        else {
          elt = aTool.AddVolume(np[n1].node, np[n4].node,
                                np[n3].node, np[n2].node,
                                np[n5].node, np[n8].node,
                                np[n7].node, np[n6].node);
        }
        
        meshDS->SetMeshElementOnShape(elt, shapeID);
      }
    }
  }
  if ( np ) delete [] np;
  return ClearAndReturn( aQuads, true );
}