-// Copyright (C) 2007-2012 CEA/DEN, EDF R&D, OPEN CASCADE
+// Copyright (C) 2007-2021 CEA/DEN, EDF R&D, OPEN CASCADE
//
// 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.
+// 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
// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//
-// SMESH SMDS : implementaion of Salome mesh data structure
+// SMESH SMDS : implementation of Salome mesh data structure
// File : SMDS_Mesh.hxx
// Module : SMESH
//
#include "SMESH_SMDS.hxx"
-#include "SMDS_MeshNode.hxx"
-#include "SMDS_MeshCell.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_MeshVolume.hxx"
-#include "SMDS_MeshNodeIDFactory.hxx"
-#include "SMDS_MeshElementIDFactory.hxx"
#include "SMDS_MeshInfo.hxx"
-#include "SMDS_ElemIterator.hxx"
-#include "SMDS_VolumeOfNodes.hxx"
-#include "SMDS_VtkEdge.hxx"
-#include "SMDS_VtkFace.hxx"
-#include "SMDS_VtkVolume.hxx"
-#include "ObjectPool.hxx"
+#include "SMDS_MeshNode.hxx"
+#include "SMDS_MeshVolume.hxx"
#include "SMDS_UnstructuredGrid.hxx"
-#include "SMDS_BallElement.hxx"
-#include <boost/shared_ptr.hpp>
#include <set>
#include <list>
#include <vector>
-#include <vtkSystemIncludes.h>
-#include <cassert>
-#include "Utils_SALOME_Exception.hxx"
+class SMDS_ElementHolder;
+class SMDS_ElementFactory;
+class SMDS_NodeFactory;
-#define MYASSERT(val) if (!(val)) throw SALOME_Exception(LOCALIZED("assertion not verified"));
-
-class SMDS_EXPORT SMDS_Mesh:public SMDS_MeshObject
+class SMDS_EXPORT SMDS_Mesh : public SMDS_MeshObject
{
public:
- friend class SMDS_MeshIDFactory;
- friend class SMDS_MeshNodeIDFactory;
- friend class SMDS_MeshElementIDFactory;
- friend class SMDS_MeshVolumeVtkNodes;
- friend class SMDS_MeshNode;
SMDS_Mesh();
- //! to retreive this SMDS_Mesh instance from its elements (index stored in SMDS_Elements)
- static std::vector<SMDS_Mesh*> _meshList;
-
//! actual nodes coordinates, cells definition and reverse connectivity are stored in a vtkUnstructuredGrid
- inline SMDS_UnstructuredGrid* getGrid() {return myGrid; }
- inline int getMeshId() {return myMeshId; }
+ inline SMDS_UnstructuredGrid* GetGrid() { return myGrid; }
- virtual SMDS_NodeIteratorPtr nodesIterator (bool idInceasingOrder=false) const;
- virtual SMDS_EdgeIteratorPtr edgesIterator (bool idInceasingOrder=false) const;
- virtual SMDS_FaceIteratorPtr facesIterator (bool idInceasingOrder=false) const;
- virtual SMDS_VolumeIteratorPtr volumesIterator (bool idInceasingOrder=false) const;
+ 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 SMDS_MeshNode* sm1stNode=0) const;
+ virtual SMDS_ElemIteratorPtr shapeElementsIterator(int shapeID,
+ size_t nbElemsToReturn=-1,
+ const SMDS_MeshElement* sm1stElem=0) const;
+
SMDSAbs_ElementType GetElementType( const int id, const bool iselem ) const;
SMDS_Mesh *AddSubMesh();
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);
// 2d order triangle of 6 nodes
virtual SMDS_MeshFace* AddFaceWithID(int n1, int n2, int n3,
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);
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);
// hexagonal prism
virtual SMDS_MeshVolume* AddVolumeWithID(int n1, int n2, int n3, int n4, int n5, int n6,
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,
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);
+ (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);
+ (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);
+ (const std::vector<const SMDS_MeshNode*> & nodes,
+ const std::vector<int> & quantities);
virtual SMDS_MeshVolume* AddVolumeFromVtkIds(const std::vector<vtkIdType>& vtkNodeIds);
- virtual SMDS_MeshVolume* AddVolumeFromVtkIdsWithID(const std::vector<vtkIdType>& vtkNodeIds,
- const int ID);
-
virtual SMDS_MeshFace* AddFaceFromVtkIds(const std::vector<vtkIdType>& vtkNodeIds);
- virtual SMDS_MeshFace* AddFaceFromVtkIdsWithID(const std::vector<vtkIdType>& vtkNodeIds,
- const int ID);
+ virtual void MoveNode(const SMDS_MeshNode *n, double x, double y, double z);
- virtual void RemoveElement(const SMDS_MeshElement * elem,
- std::list<const SMDS_MeshElement *>& removedElems,
- std::list<const SMDS_MeshElement *>& removedNodes,
- const bool removenodes = false);
+ 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 Remove0DElement(const SMDS_Mesh0DElement * elem0d);
- 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.
const int nbnodes);
bool ChangePolyhedronNodes(const SMDS_MeshElement * elem,
const std::vector<const SMDS_MeshNode*>& nodes,
- const std::vector<int> & quantities);
+ const std::vector<int>& quantities);
- virtual void Renumber (const bool isNodes, const int startID = 1, const int deltaID = 1);
+ //virtual void Renumber (const bool isNodes, const int startID = 1, const int deltaID = 1);
// Renumber all nodes or elements.
- virtual void compactMesh();
+
+ virtual void CompactMesh();
+ virtual bool IsCompacted();
+ virtual bool HasNumerationHoles();
+
+ 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_MeshNode *FindNodeVtk(int idnode) const;
- const SMDS_Mesh0DElement* Find0DElement(int idnode) const;
- const SMDS_BallElement* FindBall(int idnode) const;
- const SMDS_MeshEdge *FindEdge(int idnode1, int idnode2) const;
- const SMDS_MeshEdge *FindEdge(int idnode1, int idnode2, int idnode3) 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_MeshFace *FindFace(int idnode1, int idnode2, int idnode3,
- int idnode4, int idnode5, int idnode6) const;
- const SMDS_MeshFace *FindFace(int idnode1, int idnode2, int idnode3, int idnode4,
- int idnode5, int idnode6, int idnode7, int idnode8) const;
- const SMDS_MeshElement *FindElement(int IDelem) 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 *n7,
const SMDS_MeshNode *n8);
- const SMDS_MeshFace *FindFace(const std::vector<int>& nodes_ids) const;
- static const SMDS_MeshFace* FindFace(const std::vector<const SMDS_MeshNode *>& nodes);
+ 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;
/*!
* \brief Raise an exception if free memory (ram+swap) too low
- * \param doNotRaise - if true, suppres exception, just return free memory size
+ * \param doNotRaise - if true, suppress exception, just return free memory size
* \retval int - amount of available memory in MB or negative number in failure case
*/
- static int CheckMemory(const bool doNotRaise=false) throw (std::bad_alloc);
+ static int CheckMemory(const bool doNotRaise=false);
- int MaxNodeID() const;
- int MinNodeID() const;
- int MaxElementID() const;
- int MinElementID() const;
+ virtual int MaxNodeID() const;
+ virtual int MinNodeID() const;
+ virtual int MaxElementID() const;
+ virtual int MinElementID() const;
const SMDS_MeshInfo& GetMeshInfo() const { return myInfo; }
virtual int NbNodes() const;
+ virtual int NbElements() const;
virtual int Nb0DElements() const;
virtual int NbBalls() const;
virtual int NbEdges() const;
virtual int NbVolumes() const;
virtual int NbSubMesh() const;
- void DumpNodes() const;
- void Dump0DElements() const;
- void DumpEdges() const;
- void DumpFaces() const;
- void DumpVolumes() const;
- void DebugStats() const;
-
virtual ~SMDS_Mesh();
- bool hasConstructionEdges();
- bool hasConstructionFaces();
- bool hasInverseElements();
- void setConstructionEdges(bool);
- void setConstructionFaces(bool);
- void setInverseElements(bool);
-
- /*!
- * 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
- */
- bool Contains (const SMDS_MeshElement* elem) const;
-
- typedef std::vector<SMDS_MeshNode *> SetOfNodes;
- typedef std::vector<SMDS_MeshCell *> SetOfCells;
-
- void updateNodeMinMax();
- void updateBoundingBox();
double getMaxDim();
- int fromVtkToSmds(int vtkid);
+ int FromVtkToSmds(int vtkid) const;
- void incrementNodesCapacity(int nbNodes);
- void incrementCellsCapacity(int nbCells);
- void adjustStructure();
- void dumpGrid(string ficdump="dumpGrid");
+ void dumpGrid(std::string ficdump="dumpGrid");
static int chunkSize;
//! low level modification: add, change or remove node or element
inline void setMyModified() { this->myModified = true; }
void Modified();
- unsigned long GetMTime() const;
- bool isCompacted();
+ vtkMTimeType GetMTime() const;
-protected:
+ protected:
SMDS_Mesh(SMDS_Mesh * parent);
- SMDS_MeshFace * createTriangle(const SMDS_MeshNode * node1,
- const SMDS_MeshNode * node2,
- const SMDS_MeshNode * node3,
- int ID);
- SMDS_MeshFace * createQuadrangle(const SMDS_MeshNode * node1,
- const SMDS_MeshNode * node2,
- const SMDS_MeshNode * node3,
- const SMDS_MeshNode * node4,
- int ID);
- SMDS_MeshEdge* FindEdgeOrCreate(const SMDS_MeshNode * n1,
- const SMDS_MeshNode * n2);
- SMDS_MeshFace* FindFaceOrCreate(const SMDS_MeshNode *n1,
- const SMDS_MeshNode *n2,
- const SMDS_MeshNode *n3);
- SMDS_MeshFace* FindFaceOrCreate(const SMDS_MeshNode *n1,
- const SMDS_MeshNode *n2,
- const SMDS_MeshNode *n3,
- const SMDS_MeshNode *n4);
-
- bool registerElement(int ID, SMDS_MeshElement * element);
-
void addChildrenWithNodes(std::set<const SMDS_MeshElement*>& setOfChildren,
- const SMDS_MeshElement * element,
+ const SMDS_MeshElement * element,
std::set<const SMDS_MeshElement*>& nodes);
- inline void adjustmyCellsCapacity(int ID)
- {
- assert(ID >= 0);
- myElementIDFactory->adjustMaxId(ID);
- if (ID >= myCells.size())
- myCells.resize(ID+SMDS_Mesh::chunkSize,0);
- }
-
inline void adjustBoundingBox(double x, double y, double z)
{
if (x > xmax) xmax = x;
else if (z < zmin) zmin = z;
}
- // Fields PRIVATE
-
- //! index of this SMDS_mesh in the static vector<SMDS_Mesh*> _meshList
- int myMeshId;
-
- //! 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
- ObjectPool<SMDS_MeshNode>* myNodePool;
+ void updateInverseElements( const SMDS_MeshElement * element,
+ const SMDS_MeshNode* const* nodes,
+ const int nbnodes,
+ std::set<const SMDS_MeshNode*>& oldNodes );
- //! Small objects like SMDS_VtkVolume are allocated by chunks to limit memory costs of new
- ObjectPool<SMDS_VtkVolume>* myVolumePool;
- ObjectPool<SMDS_VtkFace>* myFacePool;
- ObjectPool<SMDS_VtkEdge>* myEdgePool;
- ObjectPool<SMDS_BallElement>* myBallPool;
+ void setNbShapes( size_t nbShapes );
- //! SMDS_MeshNodes refer to vtk nodes (vtk id = index in myNodes),store reference to this mesh, and sub-shape
- SetOfNodes myNodes;
- //! SMDS_MeshCells refer to vtk cells (vtk id != index in myCells),store reference to this mesh, and sub-shape
- SetOfCells myCells;
+ // Fields PRIVATE
- //! for cells only: index = ID for SMDS users, value = ID in vtkUnstructuredGrid
- //std::vector<int> myCellIdSmdsToVtk;
+ //! actual nodes coordinates, cells definition and reverse connectivity are stored in a vtkUnstructuredGrid
+ SMDS_UnstructuredGrid* myGrid;
- //! for cells only: index = ID in vtkUnstructuredGrid, value = ID for SMDS users
- std::vector<int> myCellIdVtkToSmds;
+ //! 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_MeshNodeIDFactory *myNodeIDFactory;
- SMDS_MeshElementIDFactory *myElementIDFactory;
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;
+ unsigned long myModifTime, myCompactTime;
- int myNodeMin;
- int myNodeMax;
-
- bool myHasConstructionEdges;
- bool myHasConstructionFaces;
- bool myHasInverseElements;
-
- //! any add, remove or change of node or cell
- bool myModified;
+ friend class SMDS_ElementHolder;
+ std::set< SMDS_ElementHolder* > myElemHolders;
double xmin;
double xmax;