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[modules/smesh.git] / src / SMDS / SMDS_Mesh.hxx
index 61507199171cdc53354388d9a399670cac269fc8..38952f78cb5bcb17d540b1952418f3fc98078ff5 100644 (file)
-//  SMESH SMDS : implementaion of Salome mesh data structure
+// Copyright (C) 2007-2016  CEA/DEN, EDF R&D, OPEN CASCADE
 //
-//  Copyright (C) 2003  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
-//  CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS 
-// 
-//  This library is free software; you can redistribute it and/or 
-//  modify it under the terms of the GNU Lesser General Public 
-//  License as published by the Free Software Foundation; either 
-//  version 2.1 of the License. 
-// 
-//  This library is distributed in the hope that it will be useful, 
-//  but WITHOUT ANY WARRANTY; without even the implied warranty of 
-//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
-//  Lesser General Public License for more details. 
-// 
-//  You should have received a copy of the GNU Lesser General Public 
-//  License along with this library; if not, write to the Free Software 
-//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA 
-// 
-//  See http://www.opencascade.org/SALOME/ or email : webmaster.salome@opencascade.org 
+// Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
+// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
 //
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
 //
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
 //
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+//
+// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
+//
+
+//  SMESH SMDS : implementation of Salome mesh data structure
 //  File   : SMDS_Mesh.hxx
 //  Module : SMESH
-
+//
 #ifndef _SMDS_Mesh_HeaderFile
 #define _SMDS_Mesh_HeaderFile
 
-#include "SMDS_MeshNode.hxx"
+#include "SMESH_SMDS.hxx"
+
+#include "SMDS_BallElement.hxx"
+#include "SMDS_ElemIterator.hxx"
+#include "SMDS_Mesh0DElement.hxx"
+#include "SMDS_MeshCell.hxx"
 #include "SMDS_MeshEdge.hxx"
 #include "SMDS_MeshFace.hxx"
+#include "SMDS_MeshInfo.hxx"
+#include "SMDS_MeshNode.hxx"
 #include "SMDS_MeshVolume.hxx"
-#include "SMDS_MeshElementIDFactory.hxx"
-#include "SMDS_Iterator.hxx"
+#include "SMDS_UnstructuredGrid.hxx"
 
-#include <boost/shared_ptr.hpp>
 #include <set>
 #include <list>
+#include <vector>
 
-class SMDSControl_BoundaryEdges;
+class SMDS_ElementHolder;
+class SMDS_ElementFactory;
+class SMDS_NodeFactory;
 
-typedef SMDS_Iterator<const SMDS_MeshNode *> SMDS_NodeIterator;
-typedef boost::shared_ptr<SMDS_Iterator<const SMDS_MeshNode *> > SMDS_NodeIteratorPtr;
-typedef SMDS_Iterator<const SMDS_MeshEdge *> SMDS_EdgeIterator;
-typedef boost::shared_ptr<SMDS_Iterator<const SMDS_MeshEdge *> > SMDS_EdgeIteratorPtr;
-typedef SMDS_Iterator<const SMDS_MeshFace *> SMDS_FaceIterator;
-typedef boost::shared_ptr<SMDS_Iterator<const SMDS_MeshFace *> > SMDS_FaceIteratorPtr;
-typedef SMDS_Iterator<const SMDS_MeshVolume *> SMDS_VolumeIterator;
-typedef boost::shared_ptr<SMDS_Iterator<const SMDS_MeshVolume *> > SMDS_VolumeIteratorPtr;
-
-class SMDS_Mesh:public SMDS_MeshObject{
+class SMDS_EXPORT SMDS_Mesh : public SMDS_MeshObject
+{
 public:
-  
+
   SMDS_Mesh();
   
-  SMDS_NodeIteratorPtr nodesIterator() const;
-  SMDS_EdgeIteratorPtr edgesIterator() const;
-  SMDS_FaceIteratorPtr facesIterator() const;
-  SMDS_VolumeIteratorPtr volumesIterator() const;
-  
+  //! actual nodes coordinates, cells definition and reverse connectivity are stored in a vtkUnstructuredGrid
+  inline SMDS_UnstructuredGrid* GetGrid() { return myGrid; }
+
+  virtual SMDS_NodeIteratorPtr   nodesIterator  () const;
+  virtual SMDS_EdgeIteratorPtr   edgesIterator  () const;
+  virtual SMDS_FaceIteratorPtr   facesIterator  () const;
+  virtual SMDS_VolumeIteratorPtr volumesIterator() const;
+
+  virtual SMDS_ElemIteratorPtr elementsIterator(SMDSAbs_ElementType type=SMDSAbs_All) const;
+  virtual SMDS_ElemIteratorPtr elementGeomIterator(SMDSAbs_GeometryType type) const;
+  virtual SMDS_ElemIteratorPtr elementEntityIterator(SMDSAbs_EntityType type) const;
+
+  virtual SMDS_NodeIteratorPtr shapeNodesIterator   (int shapeID, size_t nbElemsToReturn=-1) const;
+  virtual SMDS_ElemIteratorPtr shapeElementsIterator(int shapeID, size_t nbElemsToReturn=-1) const;
+
+  SMDSAbs_ElementType GetElementType( const int id, const bool iselem ) const;
+
   SMDS_Mesh *AddSubMesh();
-  
+
   virtual SMDS_MeshNode* AddNodeWithID(double x, double y, double z, int ID);
-  virtual SMDS_MeshNode* AddNode(double x, double y, double z);
-  
+  virtual SMDS_MeshNode* AddNode      (double x, double y, double z);
+
+  virtual SMDS_Mesh0DElement* Add0DElementWithID(int n,                   int ID);
+  virtual SMDS_Mesh0DElement* Add0DElementWithID(const SMDS_MeshNode * n, int ID);
+  virtual SMDS_Mesh0DElement* Add0DElement      (const SMDS_MeshNode * n);
+
+  virtual SMDS_BallElement* AddBallWithID(int n,                   double diameter, int ID);
+  virtual SMDS_BallElement* AddBallWithID(const SMDS_MeshNode * n, double diameter, int ID);
+  virtual SMDS_BallElement* AddBall      (const SMDS_MeshNode * n, double diameter);
+
   virtual SMDS_MeshEdge* AddEdgeWithID(int n1, int n2, int ID);
   virtual SMDS_MeshEdge* AddEdgeWithID(const SMDS_MeshNode * n1,
-                                      const SMDS_MeshNode * n2, 
-                                      int ID);
+                                       const SMDS_MeshNode * n2,
+                                       int ID);
   virtual SMDS_MeshEdge* AddEdge(const SMDS_MeshNode * n1,
-                                const SMDS_MeshNode * n2);
-  
+                                 const SMDS_MeshNode * n2);
+
+  // 2d order edge with 3 nodes: n12 - node between n1 and n2
+  virtual SMDS_MeshEdge* AddEdgeWithID(int n1, int n2, int n12, int ID);
+  virtual SMDS_MeshEdge* AddEdgeWithID(const SMDS_MeshNode * n1,
+                                       const SMDS_MeshNode * n2,
+                                       const SMDS_MeshNode * n12,
+                                       int ID);
+  virtual SMDS_MeshEdge* AddEdge(const SMDS_MeshNode * n1,
+                                 const SMDS_MeshNode * n2,
+                                 const SMDS_MeshNode * n12);
+
   virtual SMDS_MeshFace* AddFaceWithID(int n1, int n2, int n3, int ID);
   virtual SMDS_MeshFace* AddFaceWithID(const SMDS_MeshNode * n1,
-                                      const SMDS_MeshNode * n2,
-                                      const SMDS_MeshNode * n3, 
-                                      int ID);
+                                       const SMDS_MeshNode * n2,
+                                       const SMDS_MeshNode * n3,
+                                       int ID);
   virtual SMDS_MeshFace* AddFace(const SMDS_MeshNode * n1,
-                                const SMDS_MeshNode * n2,
-                                const SMDS_MeshNode * n3);
-  
+                                 const SMDS_MeshNode * n2,
+                                 const SMDS_MeshNode * n3);
+
   virtual SMDS_MeshFace* AddFaceWithID(int n1, int n2, int n3, int n4, int ID);
   virtual SMDS_MeshFace* AddFaceWithID(const SMDS_MeshNode * n1,
-                                      const SMDS_MeshNode * n2,
-                                      const SMDS_MeshNode * n3,
-                                      const SMDS_MeshNode * n4, 
-                                      int ID);
+                                       const SMDS_MeshNode * n2,
+                                       const SMDS_MeshNode * n3,
+                                       const SMDS_MeshNode * n4,
+                                       int ID);
   virtual SMDS_MeshFace* AddFace(const SMDS_MeshNode * n1,
-                                const SMDS_MeshNode * n2,
-                                const SMDS_MeshNode * n3,
-                                const SMDS_MeshNode * n4);
-  
-  virtual SMDS_MeshFace* AddFaceWithID(const SMDS_MeshEdge * e1,
-                                       const SMDS_MeshEdge * e2,
-                                       const SMDS_MeshEdge * e3, int ID);
-  virtual SMDS_MeshFace* AddFace(const SMDS_MeshEdge * e1,
-                                 const SMDS_MeshEdge * e2,
-                                 const SMDS_MeshEdge * e3);
-
-  virtual SMDS_MeshFace* AddFaceWithID(const SMDS_MeshEdge * e1,
-                                       const SMDS_MeshEdge * e2,
-                                       const SMDS_MeshEdge * e3,
-                                       const SMDS_MeshEdge * e4, int ID);
-  virtual SMDS_MeshFace* AddFace(const SMDS_MeshEdge * e1,
-                                 const SMDS_MeshEdge * e2,
-                                 const SMDS_MeshEdge * e3,
-                                 const SMDS_MeshEdge * e4);
+                                 const SMDS_MeshNode * n2,
+                                 const SMDS_MeshNode * n3,
+                                 const SMDS_MeshNode * n4);
+
+
+  // 2d order triangle of 6 nodes
+  virtual SMDS_MeshFace* AddFaceWithID(int n1, int n2, int n3,
+                                       int n12,int n23,int n31, int ID);
+  virtual SMDS_MeshFace* AddFaceWithID(const SMDS_MeshNode * n1,
+                                       const SMDS_MeshNode * n2,
+                                       const SMDS_MeshNode * n3,
+                                       const SMDS_MeshNode * n12,
+                                       const SMDS_MeshNode * n23,
+                                       const SMDS_MeshNode * n31,
+                                       int ID);
+  virtual SMDS_MeshFace* AddFace(const SMDS_MeshNode * n1,
+                                 const SMDS_MeshNode * n2,
+                                 const SMDS_MeshNode * n3,
+                                 const SMDS_MeshNode * n12,
+                                 const SMDS_MeshNode * n23,
+                                 const SMDS_MeshNode * n31);
+
+  // 2d order triangle of 7 nodes
+  virtual SMDS_MeshFace* AddFaceWithID(int n1, int n2, int n3,
+                                       int n12,int n23,int n31, int nCenter, int ID);
+  virtual SMDS_MeshFace* AddFaceWithID(const SMDS_MeshNode * n1,
+                                       const SMDS_MeshNode * n2,
+                                       const SMDS_MeshNode * n3,
+                                       const SMDS_MeshNode * n12,
+                                       const SMDS_MeshNode * n23,
+                                       const SMDS_MeshNode * n31,
+                                       const SMDS_MeshNode * nCenter,
+                                       int ID);
+  virtual SMDS_MeshFace* AddFace(const SMDS_MeshNode * n1,
+                                 const SMDS_MeshNode * n2,
+                                 const SMDS_MeshNode * n3,
+                                 const SMDS_MeshNode * n12,
+                                 const SMDS_MeshNode * n23,
+                                 const SMDS_MeshNode * n31,
+                                 const SMDS_MeshNode * nCenter);
+
+  // 2d order quadrangle
+  virtual SMDS_MeshFace* AddFaceWithID(int n1, int n2, int n3, int n4,
+                                       int n12,int n23,int n34,int n41, int ID);
+  virtual SMDS_MeshFace* AddFaceWithID(const SMDS_MeshNode * n1,
+                                       const SMDS_MeshNode * n2,
+                                       const SMDS_MeshNode * n3,
+                                       const SMDS_MeshNode * n4,
+                                       const SMDS_MeshNode * n12,
+                                       const SMDS_MeshNode * n23,
+                                       const SMDS_MeshNode * n34,
+                                       const SMDS_MeshNode * n41,
+                                       int ID);
+  virtual SMDS_MeshFace* AddFace(const SMDS_MeshNode * n1,
+                                 const SMDS_MeshNode * n2,
+                                 const SMDS_MeshNode * n3,
+                                 const SMDS_MeshNode * n4,
+                                 const SMDS_MeshNode * n12,
+                                 const SMDS_MeshNode * n23,
+                                 const SMDS_MeshNode * n34,
+                                 const SMDS_MeshNode * n41);
+
+  virtual SMDS_MeshFace* AddFaceWithID(int n1, int n2, int n3, int n4,
+                                       int n12,int n23,int n34,int n41, int nCenter, int ID);
+  virtual SMDS_MeshFace* AddFaceWithID(const SMDS_MeshNode * n1,
+                                       const SMDS_MeshNode * n2,
+                                       const SMDS_MeshNode * n3,
+                                       const SMDS_MeshNode * n4,
+                                       const SMDS_MeshNode * n12,
+                                       const SMDS_MeshNode * n23,
+                                       const SMDS_MeshNode * n34,
+                                       const SMDS_MeshNode * n41,
+                                       const SMDS_MeshNode * nCenter,
+                                       int ID);
+  virtual SMDS_MeshFace* AddFace(const SMDS_MeshNode * n1,
+                                 const SMDS_MeshNode * n2,
+                                 const SMDS_MeshNode * n3,
+                                 const SMDS_MeshNode * n4,
+                                 const SMDS_MeshNode * n12,
+                                 const SMDS_MeshNode * n23,
+                                 const SMDS_MeshNode * n34,
+                                 const SMDS_MeshNode * n41,
+                                 const SMDS_MeshNode * nCenter);
 
   virtual SMDS_MeshVolume* AddVolumeWithID(int n1, int n2, int n3, int n4, int ID);
   virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshNode * n1,
-                                          const SMDS_MeshNode * n2,
-                                          const SMDS_MeshNode * n3,
-                                          const SMDS_MeshNode * n4, 
-                                          int ID);
+                                           const SMDS_MeshNode * n2,
+                                           const SMDS_MeshNode * n3,
+                                           const SMDS_MeshNode * n4,
+                                           int ID);
   virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshNode * n1,
-                                    const SMDS_MeshNode * n2,
-                                    const SMDS_MeshNode * n3,
-                                    const SMDS_MeshNode * n4);
-  
+                                     const SMDS_MeshNode * n2,
+                                     const SMDS_MeshNode * n3,
+                                     const SMDS_MeshNode * n4);
+
   virtual SMDS_MeshVolume* AddVolumeWithID(int n1, int n2, int n3, int n4,
                                            int n5, int ID);
   virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshNode * n1,
-                                          const SMDS_MeshNode * n2,
-                                          const SMDS_MeshNode * n3,
-                                          const SMDS_MeshNode * n4,
-                                          const SMDS_MeshNode * n5, 
-                                          int ID);
+                                           const SMDS_MeshNode * n2,
+                                           const SMDS_MeshNode * n3,
+                                           const SMDS_MeshNode * n4,
+                                           const SMDS_MeshNode * n5,
+                                           int ID);
   virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshNode * n1,
-                                    const SMDS_MeshNode * n2,
-                                    const SMDS_MeshNode * n3,
-                                    const SMDS_MeshNode * n4,
-                                    const SMDS_MeshNode * n5);
-  
+                                     const SMDS_MeshNode * n2,
+                                     const SMDS_MeshNode * n3,
+                                     const SMDS_MeshNode * n4,
+                                     const SMDS_MeshNode * n5);
+
   virtual SMDS_MeshVolume* AddVolumeWithID(int n1, int n2, int n3, int n4,
                                            int n5, int n6, int ID);
   virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshNode * n1,
-                                          const SMDS_MeshNode * n2,
-                                          const SMDS_MeshNode * n3,
-                                          const SMDS_MeshNode * n4,
-                                          const SMDS_MeshNode * n5,
-                                          const SMDS_MeshNode * n6, 
-                                          int ID);
+                                           const SMDS_MeshNode * n2,
+                                           const SMDS_MeshNode * n3,
+                                           const SMDS_MeshNode * n4,
+                                           const SMDS_MeshNode * n5,
+                                           const SMDS_MeshNode * n6,
+                                           int ID);
   virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshNode * n1,
-                                    const SMDS_MeshNode * n2,
-                                    const SMDS_MeshNode * n3,
-                                    const SMDS_MeshNode * n4,
-                                    const SMDS_MeshNode * n5,
-                                    const SMDS_MeshNode * n6);
-  
+                                     const SMDS_MeshNode * n2,
+                                     const SMDS_MeshNode * n3,
+                                     const SMDS_MeshNode * n4,
+                                     const SMDS_MeshNode * n5,
+                                     const SMDS_MeshNode * n6);
+
   virtual SMDS_MeshVolume* AddVolumeWithID(int n1, int n2, int n3, int n4,
                                            int n5, int n6, int n7, int n8, int ID);
   virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshNode * n1,
-                                          const SMDS_MeshNode * n2,
-                                          const SMDS_MeshNode * n3,
-                                          const SMDS_MeshNode * n4,
-                                          const SMDS_MeshNode * n5,
-                                          const SMDS_MeshNode * n6,
-                                          const SMDS_MeshNode * n7,
-                                          const SMDS_MeshNode * n8, 
-                                          int ID);
+                                           const SMDS_MeshNode * n2,
+                                           const SMDS_MeshNode * n3,
+                                           const SMDS_MeshNode * n4,
+                                           const SMDS_MeshNode * n5,
+                                           const SMDS_MeshNode * n6,
+                                           const SMDS_MeshNode * n7,
+                                           const SMDS_MeshNode * n8,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshNode * n1,
+                                     const SMDS_MeshNode * n2,
+                                     const SMDS_MeshNode * n3,
+                                     const SMDS_MeshNode * n4,
+                                     const SMDS_MeshNode * n5,
+                                     const SMDS_MeshNode * n6,
+                                     const SMDS_MeshNode * n7,
+                                     const SMDS_MeshNode * n8);
+
+
+  // hexagonal prism
+  virtual SMDS_MeshVolume* AddVolumeWithID(int n1, int n2, int n3, int n4, int n5, int n6,
+                                           int n7, int n8, int n9, int n10, int n11, int n12,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshNode * n1,
+                                           const SMDS_MeshNode * n2,
+                                           const SMDS_MeshNode * n3,
+                                           const SMDS_MeshNode * n4,
+                                           const SMDS_MeshNode * n5,
+                                           const SMDS_MeshNode * n6,
+                                           const SMDS_MeshNode * n7,
+                                           const SMDS_MeshNode * n8,
+                                           const SMDS_MeshNode * n9,
+                                           const SMDS_MeshNode * n10,
+                                           const SMDS_MeshNode * n11,
+                                           const SMDS_MeshNode * n12,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshNode * n1,
+                                     const SMDS_MeshNode * n2,
+                                     const SMDS_MeshNode * n3,
+                                     const SMDS_MeshNode * n4,
+                                     const SMDS_MeshNode * n5,
+                                     const SMDS_MeshNode * n6,
+                                     const SMDS_MeshNode * n7,
+                                     const SMDS_MeshNode * n8,
+                                     const SMDS_MeshNode * n9,
+                                     const SMDS_MeshNode * n10,
+                                     const SMDS_MeshNode * n11,
+                                     const SMDS_MeshNode * n12);
+
+  // 2d order tetrahedron of 10 nodes
+  virtual SMDS_MeshVolume* AddVolumeWithID(int n1, int n2, int n3, int n4,
+                                           int n12,int n23,int n31,
+                                           int n14,int n24,int n34, int ID);
+  virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshNode * n1,
+                                           const SMDS_MeshNode * n2,
+                                           const SMDS_MeshNode * n3,
+                                           const SMDS_MeshNode * n4,
+                                           const SMDS_MeshNode * n12,
+                                           const SMDS_MeshNode * n23,
+                                           const SMDS_MeshNode * n31,
+                                           const SMDS_MeshNode * n14,
+                                           const SMDS_MeshNode * n24,
+                                           const SMDS_MeshNode * n34,
+                                           int ID);
   virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshNode * n1,
-                                    const SMDS_MeshNode * n2,
-                                    const SMDS_MeshNode * n3,
-                                    const SMDS_MeshNode * n4,
-                                    const SMDS_MeshNode * n5,
-                                    const SMDS_MeshNode * n6,
-                                    const SMDS_MeshNode * n7,
-                                    const SMDS_MeshNode * n8);
-
-  virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshFace * f1,
-                                           const SMDS_MeshFace * f2,
-                                           const SMDS_MeshFace * f3,
-                                           const SMDS_MeshFace * f4, int ID);
-  virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshFace * f1,
-                                     const SMDS_MeshFace * f2,
-                                     const SMDS_MeshFace * f3,
-                                     const SMDS_MeshFace * f4);
-
-  virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshFace * f1,
-                                           const SMDS_MeshFace * f2,
-                                           const SMDS_MeshFace * f3,
-                                           const SMDS_MeshFace * f4,
-                                           const SMDS_MeshFace * f5, int ID);
-  virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshFace * f1,
-                                     const SMDS_MeshFace * f2,
-                                     const SMDS_MeshFace * f3,
-                                     const SMDS_MeshFace * f4,
-                                     const SMDS_MeshFace * f5);
-
-  virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshFace * f1,
-                                           const SMDS_MeshFace * f2,
-                                           const SMDS_MeshFace * f3,
-                                           const SMDS_MeshFace * f4,
-                                           const SMDS_MeshFace * f5,
-                                           const SMDS_MeshFace * f6, int ID);
-  virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshFace * f1,
-                                     const SMDS_MeshFace * f2,
-                                     const SMDS_MeshFace * f3,
-                                     const SMDS_MeshFace * f4,
-                                     const SMDS_MeshFace * f5,
-                                     const SMDS_MeshFace * f6);
-
-  virtual void RemoveElement(const SMDS_MeshElement *        elem,
-                             list<const SMDS_MeshElement *>& removedElems,
-                             list<const SMDS_MeshElement *>& removedNodes,
-                             const bool                      removenodes = false);
-  virtual void RemoveElement(const SMDS_MeshElement * elem, const bool removenodes = false);
+                                     const SMDS_MeshNode * n2,
+                                     const SMDS_MeshNode * n3,
+                                     const SMDS_MeshNode * n4,
+                                     const SMDS_MeshNode * n12,
+                                     const SMDS_MeshNode * n23,
+                                     const SMDS_MeshNode * n31,
+                                     const SMDS_MeshNode * n14,
+                                     const SMDS_MeshNode * n24,
+                                     const SMDS_MeshNode * n34);
+
+  // 2d order pyramid of 13 nodes
+  virtual SMDS_MeshVolume* AddVolumeWithID(int n1, int n2, int n3, int n4, int n5,
+                                           int n12,int n23,int n34,int n41,
+                                           int n15,int n25,int n35,int n45,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshNode * n1,
+                                           const SMDS_MeshNode * n2,
+                                           const SMDS_MeshNode * n3,
+                                           const SMDS_MeshNode * n4,
+                                           const SMDS_MeshNode * n5,
+                                           const SMDS_MeshNode * n12,
+                                           const SMDS_MeshNode * n23,
+                                           const SMDS_MeshNode * n34,
+                                           const SMDS_MeshNode * n41,
+                                           const SMDS_MeshNode * n15,
+                                           const SMDS_MeshNode * n25,
+                                           const SMDS_MeshNode * n35,
+                                           const SMDS_MeshNode * n45,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshNode * n1,
+                                     const SMDS_MeshNode * n2,
+                                     const SMDS_MeshNode * n3,
+                                     const SMDS_MeshNode * n4,
+                                     const SMDS_MeshNode * n5,
+                                     const SMDS_MeshNode * n12,
+                                     const SMDS_MeshNode * n23,
+                                     const SMDS_MeshNode * n34,
+                                     const SMDS_MeshNode * n41,
+                                     const SMDS_MeshNode * n15,
+                                     const SMDS_MeshNode * n25,
+                                     const SMDS_MeshNode * n35,
+                                     const SMDS_MeshNode * n45);
+
+  // 2d order Pentahedron with 15 nodes
+  virtual SMDS_MeshVolume* AddVolumeWithID(int n1, int n2, int n3,
+                                           int n4, int n5, int n6,
+                                           int n12,int n23,int n31,
+                                           int n45,int n56,int n64,
+                                           int n14,int n25,int n36,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshNode * n1,
+                                           const SMDS_MeshNode * n2,
+                                           const SMDS_MeshNode * n3,
+                                           const SMDS_MeshNode * n4,
+                                           const SMDS_MeshNode * n5,
+                                           const SMDS_MeshNode * n6,
+                                           const SMDS_MeshNode * n12,
+                                           const SMDS_MeshNode * n23,
+                                           const SMDS_MeshNode * n31,
+                                           const SMDS_MeshNode * n45,
+                                           const SMDS_MeshNode * n56,
+                                           const SMDS_MeshNode * n64,
+                                           const SMDS_MeshNode * n14,
+                                           const SMDS_MeshNode * n25,
+                                           const SMDS_MeshNode * n36,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshNode * n1,
+                                     const SMDS_MeshNode * n2,
+                                     const SMDS_MeshNode * n3,
+                                     const SMDS_MeshNode * n4,
+                                     const SMDS_MeshNode * n5,
+                                     const SMDS_MeshNode * n6,
+                                     const SMDS_MeshNode * n12,
+                                     const SMDS_MeshNode * n23,
+                                     const SMDS_MeshNode * n31,
+                                     const SMDS_MeshNode * n45,
+                                     const SMDS_MeshNode * n56,
+                                     const SMDS_MeshNode * n64,
+                                     const SMDS_MeshNode * n14,
+                                     const SMDS_MeshNode * n25,
+                                     const SMDS_MeshNode * n36);
+
+  // 2d order Pentahedron with 18 nodes
+  virtual SMDS_MeshVolume* AddVolumeWithID(int n1, int n2, int n3,
+                                           int n4, int n5, int n6,
+                                           int n12,int n23,int n31,
+                                           int n45,int n56,int n64,
+                                           int n14,int n25,int n36,
+                                           int n1245, int n2356, int n1346,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshNode * n1,
+                                           const SMDS_MeshNode * n2,
+                                           const SMDS_MeshNode * n3,
+                                           const SMDS_MeshNode * n4,
+                                           const SMDS_MeshNode * n5,
+                                           const SMDS_MeshNode * n6,
+                                           const SMDS_MeshNode * n12,
+                                           const SMDS_MeshNode * n23,
+                                           const SMDS_MeshNode * n31,
+                                           const SMDS_MeshNode * n45,
+                                           const SMDS_MeshNode * n56,
+                                           const SMDS_MeshNode * n64,
+                                           const SMDS_MeshNode * n14,
+                                           const SMDS_MeshNode * n25,
+                                           const SMDS_MeshNode * n36,
+                                           const SMDS_MeshNode * n1245,
+                                           const SMDS_MeshNode * n2356,
+                                           const SMDS_MeshNode * n1346,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshNode * n1,
+                                     const SMDS_MeshNode * n2,
+                                     const SMDS_MeshNode * n3,
+                                     const SMDS_MeshNode * n4,
+                                     const SMDS_MeshNode * n5,
+                                     const SMDS_MeshNode * n6,
+                                     const SMDS_MeshNode * n12,
+                                     const SMDS_MeshNode * n23,
+                                     const SMDS_MeshNode * n31,
+                                     const SMDS_MeshNode * n45,
+                                     const SMDS_MeshNode * n56,
+                                     const SMDS_MeshNode * n64,
+                                     const SMDS_MeshNode * n14,
+                                     const SMDS_MeshNode * n25,
+                                     const SMDS_MeshNode * n36,
+                                     const SMDS_MeshNode * n1245,
+                                     const SMDS_MeshNode * n2356,
+                                     const SMDS_MeshNode * n1346);
+
+
+  // 2d oreder Hexahedrons with 20 nodes
+  virtual SMDS_MeshVolume* AddVolumeWithID(int n1, int n2, int n3, int n4,
+                                           int n5, int n6, int n7, int n8,
+                                           int n12,int n23,int n34,int n41,
+                                           int n56,int n67,int n78,int n85,
+                                           int n15,int n26,int n37,int n48,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshNode * n1,
+                                           const SMDS_MeshNode * n2,
+                                           const SMDS_MeshNode * n3,
+                                           const SMDS_MeshNode * n4,
+                                           const SMDS_MeshNode * n5,
+                                           const SMDS_MeshNode * n6,
+                                           const SMDS_MeshNode * n7,
+                                           const SMDS_MeshNode * n8,
+                                           const SMDS_MeshNode * n12,
+                                           const SMDS_MeshNode * n23,
+                                           const SMDS_MeshNode * n34,
+                                           const SMDS_MeshNode * n41,
+                                           const SMDS_MeshNode * n56,
+                                           const SMDS_MeshNode * n67,
+                                           const SMDS_MeshNode * n78,
+                                           const SMDS_MeshNode * n85,
+                                           const SMDS_MeshNode * n15,
+                                           const SMDS_MeshNode * n26,
+                                           const SMDS_MeshNode * n37,
+                                           const SMDS_MeshNode * n48,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshNode * n1,
+                                     const SMDS_MeshNode * n2,
+                                     const SMDS_MeshNode * n3,
+                                     const SMDS_MeshNode * n4,
+                                     const SMDS_MeshNode * n5,
+                                     const SMDS_MeshNode * n6,
+                                     const SMDS_MeshNode * n7,
+                                     const SMDS_MeshNode * n8,
+                                     const SMDS_MeshNode * n12,
+                                     const SMDS_MeshNode * n23,
+                                     const SMDS_MeshNode * n34,
+                                     const SMDS_MeshNode * n41,
+                                     const SMDS_MeshNode * n56,
+                                     const SMDS_MeshNode * n67,
+                                     const SMDS_MeshNode * n78,
+                                     const SMDS_MeshNode * n85,
+                                     const SMDS_MeshNode * n15,
+                                     const SMDS_MeshNode * n26,
+                                     const SMDS_MeshNode * n37,
+                                     const SMDS_MeshNode * n48);
+
+  // 2d oreder Hexahedrons with 27 nodes
+  virtual SMDS_MeshVolume* AddVolumeWithID(int n1, int n2, int n3, int n4,
+                                           int n5, int n6, int n7, int n8,
+                                           int n12,int n23,int n34,int n41,
+                                           int n56,int n67,int n78,int n85,
+                                           int n15,int n26,int n37,int n48,
+                                           int n1234,int n1256,int n2367,int n3478,
+                                           int n1458,int n5678,int nCenter,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolumeWithID(const SMDS_MeshNode * n1,
+                                           const SMDS_MeshNode * n2,
+                                           const SMDS_MeshNode * n3,
+                                           const SMDS_MeshNode * n4,
+                                           const SMDS_MeshNode * n5,
+                                           const SMDS_MeshNode * n6,
+                                           const SMDS_MeshNode * n7,
+                                           const SMDS_MeshNode * n8,
+                                           const SMDS_MeshNode * n12,
+                                           const SMDS_MeshNode * n23,
+                                           const SMDS_MeshNode * n34,
+                                           const SMDS_MeshNode * n41,
+                                           const SMDS_MeshNode * n56,
+                                           const SMDS_MeshNode * n67,
+                                           const SMDS_MeshNode * n78,
+                                           const SMDS_MeshNode * n85,
+                                           const SMDS_MeshNode * n15,
+                                           const SMDS_MeshNode * n26,
+                                           const SMDS_MeshNode * n37,
+                                           const SMDS_MeshNode * n48,
+                                           const SMDS_MeshNode * n1234,
+                                           const SMDS_MeshNode * n1256,
+                                           const SMDS_MeshNode * n2367,
+                                           const SMDS_MeshNode * n3478,
+                                           const SMDS_MeshNode * n1458,
+                                           const SMDS_MeshNode * n5678,
+                                           const SMDS_MeshNode * nCenter,
+                                           int ID);
+  virtual SMDS_MeshVolume* AddVolume(const SMDS_MeshNode * n1,
+                                     const SMDS_MeshNode * n2,
+                                     const SMDS_MeshNode * n3,
+                                     const SMDS_MeshNode * n4,
+                                     const SMDS_MeshNode * n5,
+                                     const SMDS_MeshNode * n6,
+                                     const SMDS_MeshNode * n7,
+                                     const SMDS_MeshNode * n8,
+                                     const SMDS_MeshNode * n12,
+                                     const SMDS_MeshNode * n23,
+                                     const SMDS_MeshNode * n34,
+                                     const SMDS_MeshNode * n41,
+                                     const SMDS_MeshNode * n56,
+                                     const SMDS_MeshNode * n67,
+                                     const SMDS_MeshNode * n78,
+                                     const SMDS_MeshNode * n85,
+                                     const SMDS_MeshNode * n15,
+                                     const SMDS_MeshNode * n26,
+                                     const SMDS_MeshNode * n37,
+                                     const SMDS_MeshNode * n48,
+                                     const SMDS_MeshNode * n1234,
+                                     const SMDS_MeshNode * n1256,
+                                     const SMDS_MeshNode * n2367,
+                                     const SMDS_MeshNode * n3478,
+                                     const SMDS_MeshNode * n1458,
+                                     const SMDS_MeshNode * n5678,
+                                     const SMDS_MeshNode * nCenter);
+
+  virtual SMDS_MeshFace* AddPolygonalFaceWithID (const std::vector<int> & nodes_ids,
+                                                 const int                ID);
+
+  virtual SMDS_MeshFace* AddPolygonalFaceWithID (const std::vector<const SMDS_MeshNode*> & nodes,
+                                                 const int                                 ID);
+
+  virtual SMDS_MeshFace* AddPolygonalFace (const std::vector<const SMDS_MeshNode*> & nodes);
+
+  virtual SMDS_MeshFace* AddQuadPolygonalFaceWithID(const std::vector<int> & nodes_ids,
+                                                    const int                ID);
+
+  virtual SMDS_MeshFace* AddQuadPolygonalFaceWithID(const std::vector<const SMDS_MeshNode*> & nodes,
+                                                    const int                                 ID);
+
+  virtual SMDS_MeshFace* AddQuadPolygonalFace(const std::vector<const SMDS_MeshNode*> & nodes);
+
+  virtual SMDS_MeshVolume* AddPolyhedralVolumeWithID
+    (const std::vector<int> & nodes_ids,
+     const std::vector<int> & quantities,
+     const int                ID);
+
+  virtual SMDS_MeshVolume* AddPolyhedralVolumeWithID
+    (const std::vector<const SMDS_MeshNode*> & nodes,
+     const std::vector<int>                  & quantities,
+     const int                                 ID);
+
+  virtual SMDS_MeshVolume* AddPolyhedralVolume
+    (const std::vector<const SMDS_MeshNode*> & nodes,
+     const std::vector<int>                  & quantities);
+
+  virtual SMDS_MeshVolume* AddVolumeFromVtkIds(const std::vector<vtkIdType>& vtkNodeIds);
+
+  virtual SMDS_MeshFace* AddFaceFromVtkIds(const std::vector<vtkIdType>& vtkNodeIds);
+
+  virtual void MoveNode(const SMDS_MeshNode *n, double x, double y, double z);
+
+  virtual void RemoveElement(const SMDS_MeshElement *               elem,
+                             std::vector<const SMDS_MeshElement *>& removedElems,
+                             std::vector<const SMDS_MeshElement *>& removedNodes,
+                             const bool                             removenodes = false);
+  virtual void RemoveElement(const SMDS_MeshElement * elem, bool removenodes = false);
   virtual void RemoveNode(const SMDS_MeshNode * node);
-  virtual void RemoveEdge(const SMDS_MeshEdge * edge);
-  virtual void RemoveFace(const SMDS_MeshFace * face);
-  virtual void RemoveVolume(const SMDS_MeshVolume * volume);
-  
+
+  /*! Remove only the given element and only if it is free.
+   *  Method does not work for meshes with descendants.
+   *  Implemented for fast cleaning of meshes.
+   */
+  virtual void RemoveFreeElement(const SMDS_MeshElement * elem);
+
+  virtual void Clear();
+
   virtual bool RemoveFromParent();
   virtual bool RemoveSubMesh(const SMDS_Mesh * aMesh);
-  
+
+  bool ChangeElementNodes(const SMDS_MeshElement * elem,
+                          const SMDS_MeshNode    * nodes[],
+                          const int                nbnodes);
+
+  //virtual void Renumber (const bool isNodes, const int startID = 1, const int deltaID = 1);
+  // Renumber all nodes or elements.
+
+  virtual void CompactMesh();
+  bool IsCompacted();
+
+  template<class ELEMTYPE>
+    static const ELEMTYPE* DownCast( const SMDS_MeshElement* e )
+  {
+    return (( e && !e->IsNull() && ELEMTYPE::Type() == e->GetType() ) ?
+            static_cast<const ELEMTYPE*>(e) : 0 );
+  }
+
   const SMDS_MeshNode *FindNode(int idnode) const;
-  const SMDS_MeshEdge *FindEdge(int idnode1, int idnode2) const;
-  const SMDS_MeshFace *FindFace(int idnode1, int idnode2, int idnode3) const;
-  const SMDS_MeshFace *FindFace(int idnode1, int idnode2, int idnode3, int idnode4) const;
-  const SMDS_MeshElement *FindElement(int IDelem) const;
-       
-  int NbNodes() const;
-  int NbEdges() const;
-  int NbFaces() const;
-  int NbVolumes() const;
-  int NbSubMesh() const;
-  void DumpNodes() const;
-  void DumpEdges() const;
-  void DumpFaces() const;
-  void DumpVolumes() const;
-  void DebugStats() const;
-  SMDS_Mesh *boundaryFaces();
-  SMDS_Mesh *boundaryEdges();
-  virtual ~SMDS_Mesh();
-  bool hasConstructionEdges();
-  bool hasConstructionFaces();
-  bool hasInverseElements();
-  void setConstructionEdges(bool);
-  void setConstructionFaces(bool);
-  void setInverseElements(bool);
+  const SMDS_MeshNode *FindNodeVtk(int idnode) const;
+  const SMDS_MeshElement *FindElementVtk(int IDelem) const;
+  virtual const SMDS_MeshElement * FindElement(int IDelem) const;
+  static const SMDS_Mesh0DElement* Find0DElement(const SMDS_MeshNode * n);
+  static const SMDS_BallElement* FindBall(const SMDS_MeshNode * n);
+  static const SMDS_MeshEdge* FindEdge(const SMDS_MeshNode * n1,
+                                       const SMDS_MeshNode * n2);
+  static const SMDS_MeshEdge* FindEdge(const SMDS_MeshNode * n1,
+                                       const SMDS_MeshNode * n2,
+                                       const SMDS_MeshNode * n3);
+  static const SMDS_MeshFace* FindFace(const SMDS_MeshNode *n1,
+                                       const SMDS_MeshNode *n2,
+                                       const SMDS_MeshNode *n3);
+  static const SMDS_MeshFace* FindFace(const SMDS_MeshNode *n1,
+                                       const SMDS_MeshNode *n2,
+                                       const SMDS_MeshNode *n3,
+                                       const SMDS_MeshNode *n4);
+  static const SMDS_MeshFace* FindFace(const SMDS_MeshNode *n1,
+                                       const SMDS_MeshNode *n2,
+                                       const SMDS_MeshNode *n3,
+                                       const SMDS_MeshNode *n4,
+                                       const SMDS_MeshNode *n5,
+                                       const SMDS_MeshNode *n6);
+  static const SMDS_MeshFace* FindFace(const SMDS_MeshNode *n1,
+                                       const SMDS_MeshNode *n2,
+                                       const SMDS_MeshNode *n3,
+                                       const SMDS_MeshNode *n4,
+                                       const SMDS_MeshNode *n5,
+                                       const SMDS_MeshNode *n6,
+                                       const SMDS_MeshNode *n7,
+                                       const SMDS_MeshNode *n8);
+
+  static const SMDS_MeshFace*    FindFace   (const std::vector<const SMDS_MeshNode *>& nodes);
+  static const SMDS_MeshElement* FindElement(const std::vector<const SMDS_MeshNode *>& nodes,
+                                             const SMDSAbs_ElementType                 type=SMDSAbs_All,
+                                             const bool                                noMedium=true);
+  static int GetElementsByNodes(const std::vector<const SMDS_MeshNode *>& nodes,
+                                std::vector<const SMDS_MeshElement *>&    foundElems,
+                                const SMDSAbs_ElementType                 type=SMDSAbs_All);
+
+  virtual bool Contains( const SMDS_MeshElement* elem ) const;
 
   /*!
-   * Checks if the element is present in mesh.
-   * Useful to determine dead pointers.
-   * Use this function for debug purpose only! Do not check in the code
-   * using it even in _DEBUG_ mode
+   * \brief Raise an exception if free memory (ram+swap) too low
+    * \param doNotRaise - if true, suppres exception, just return free memory size
+    * \retval int - amount of available memory in MB or negative number in failure case
    */
-  bool Contains (const SMDS_MeshElement* elem) const;
+  static int CheckMemory(const bool doNotRaise=false) throw (std::bad_alloc);
 
-  typedef set<SMDS_MeshNode *> SetOfNodes;
-  typedef set<SMDS_MeshEdge *> SetOfEdges;
-  typedef set<SMDS_MeshFace *> SetOfFaces;
-  typedef set<SMDS_MeshVolume *> SetOfVolumes;
+  int MaxNodeID() const;
+  int MinNodeID() const;
+  int MaxElementID() const;
+  int MinElementID() const;
 
-private:
-  SMDS_Mesh(SMDS_Mesh * parent);
+  const SMDS_MeshInfo& GetMeshInfo() const { return myInfo; }
 
-  SMDS_MeshFace * createTriangle(const SMDS_MeshNode * node1, 
-                                const SMDS_MeshNode * node2, 
-                                const SMDS_MeshNode * node3);
+  virtual int NbNodes() const;
+  virtual int NbElements() const;
+  virtual int Nb0DElements() const;
+  virtual int NbBalls() const;
+  virtual int NbEdges() const;
+  virtual int NbFaces() const;
+  virtual int NbVolumes() const;
+  virtual int NbSubMesh() const;
 
-  SMDS_MeshFace * createQuadrangle(const SMDS_MeshNode * node1,
-                                  const SMDS_MeshNode * node2, 
-                                  const SMDS_MeshNode * node3, 
-                                  const SMDS_MeshNode * node4);
+  virtual ~SMDS_Mesh();
 
-  bool registerElement(int ID, SMDS_MeshElement * element);
+  double getMaxDim();
+  int FromVtkToSmds(int vtkid) const;
 
-  const SMDS_MeshEdge* FindEdge(const SMDS_MeshNode * n1,
-                               const SMDS_MeshNode * n2) const;
+  void dumpGrid(std::string ficdump="dumpGrid");
+  static int chunkSize;
 
-  SMDS_MeshEdge* FindEdgeOrCreate(const SMDS_MeshNode * n1,
-                                 const SMDS_MeshNode * n2);
+  //! low level modification: add, change or remove node or element
+  inline void setMyModified() { this->myModified = true; }
 
-  const SMDS_MeshFace* FindFace(const SMDS_MeshNode *n1,
-                                const SMDS_MeshNode *n2,
-                                const SMDS_MeshNode *n3) const;
+  void Modified();
+  vtkMTimeType GetMTime() const;
 
-  SMDS_MeshFace* FindFaceOrCreate(const SMDS_MeshNode *n1,
-                                 const SMDS_MeshNode *n2,
-                                 const SMDS_MeshNode *n3);
+protected:
+  SMDS_Mesh(SMDS_Mesh * parent);
 
-  const SMDS_MeshFace* FindFace(const SMDS_MeshNode *n1,
-                               const SMDS_MeshNode *n2,
-                               const SMDS_MeshNode *n3,
-                               const SMDS_MeshNode *n4) const;
+  void addChildrenWithNodes(std::set<const SMDS_MeshElement*>& setOfChildren,
+                            const SMDS_MeshElement *           element,
+                            std::set<const SMDS_MeshElement*>& nodes);
 
-  SMDS_MeshFace* FindFaceOrCreate(const SMDS_MeshNode *n1,
-                                 const SMDS_MeshNode *n2,
-                                 const SMDS_MeshNode *n3,
-                                 const SMDS_MeshNode *n4);
+  inline void adjustBoundingBox(double x, double y, double z)
+  {
+    if (x > xmax) xmax = x;
+    else if (x < xmin) xmin = x;
+    if (y > ymax) ymax = y;
+    else if (y < ymin) ymin = y;
+    if (z > zmax) zmax = z;
+    else if (z < zmin) zmin = z;
+  }
+
+  void setNbShapes( size_t nbShapes );
 
-  void addChildrenWithNodes(set<const SMDS_MeshElement*>& setOfChildren, 
-                           const SMDS_MeshElement * element, 
-                           set<const SMDS_MeshElement*>& nodes);
 
   // Fields PRIVATE
-  
-  SetOfNodes myNodes;
-  SetOfEdges myEdges;
-  SetOfFaces myFaces;
-  SetOfVolumes myVolumes;
-  SMDS_Mesh *myParent;
-  list<SMDS_Mesh *> myChildren;
-  SMDS_MeshElementIDFactory *myNodeIDFactory;
-  SMDS_MeshElementIDFactory *myElementIDFactory;
-  
-  bool myHasConstructionEdges;
-  bool myHasConstructionFaces;
-  bool myHasInverseElements;
+
+  //! actual nodes coordinates, cells definition and reverse connectivity are stored in a vtkUnstructuredGrid
+  SMDS_UnstructuredGrid* myGrid;
+
+  //! Small objects like SMDS_MeshNode are allocated by chunks to limit memory costs of new
+  SMDS_NodeFactory*      myNodeFactory;
+  SMDS_ElementFactory*   myCellFactory;
+
+  SMDS_Mesh *            myParent;
+  std::list<SMDS_Mesh *> myChildren;
+  SMDS_MeshInfo          myInfo;
+
+  //! any add, remove or change of node or cell
+  bool                   myModified;
+  //! use a counter to keep track of modifications
+  unsigned long          myModifTime, myCompactTime;
+
+  friend class SMDS_ElementHolder;
+  std::set< SMDS_ElementHolder* > myElemHolders;
+
+  double xmin;
+  double xmax;
+  double ymin;
+  double ymax;
+  double zmin;
+  double zmax;
 };
 
+
 #endif