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[modules/smesh.git] / src / SMESH / SMESH_MeshEditor.hxx
index 78457ef..544a7dd 100644 (file)
-//  SMESH SMESH_I : idl implementation based on 'SMESH' unit's calsses
+// Copyright (C) 2007-2014  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
+//
+
 // File      : SMESH_MeshEditor.hxx
 // Created   : Mon Apr 12 14:56:19 2004
 // Author    : Edward AGAPOV (eap)
 // Module    : SMESH
-
-
+//
 #ifndef SMESH_MeshEditor_HeaderFile
 #define SMESH_MeshEditor_HeaderFile
 
-#include "SMESH_Mesh.hxx"
+#include "SMESH_SMESH.hxx"
+
+#include "SMDS_MeshElement.hxx"
 #include "SMESH_Controls.hxx"
-#include "SMESH_SequenceOfNode.hxx"
-#include "gp_Dir.hxx"
-#include "TColStd_HSequenceOfReal.hxx"
+#include "SMESH_Mesh.hxx"
+#include "SMESH_TypeDefs.hxx"
+#include "SMESH_ComputeError.hxx"
+
+#include <utilities.h>
+
+#include <TColStd_HSequenceOfReal.hxx>
+#include <gp_Dir.hxx>
 
 #include <list>
 #include <map>
+#include <set>
 
-typedef map<const SMDS_MeshElement*,
-            list<const SMDS_MeshElement*> > TElemOfElemListMap;
-
-class SMDS_MeshElement;
 class SMDS_MeshFace;
 class SMDS_MeshNode;
 class gp_Ax1;
 class gp_Vec;
 class gp_Pnt;
+class SMESH_MesherHelper;
+class SMESH_NodeSearcher;
+
+// ============================================================
+/*!
+ * \brief Editor of a mesh
+ */
+// ============================================================
 
-class SMESH_MeshEditor {
- public:
+class SMESH_EXPORT SMESH_MeshEditor
+{
+public:
 
   SMESH_MeshEditor( SMESH_Mesh* theMesh );
 
-  bool Remove (const std::list< int >& theElemIDs, const bool isNodes);
+  SMESH_Mesh   *                 GetMesh()   { return myMesh; }
+  SMESHDS_Mesh *                 GetMeshDS() { return myMesh->GetMeshDS(); }
+
+  const SMESH_SequenceOfElemPtr& GetLastCreatedNodes() const { return myLastCreatedNodes; }
+  const SMESH_SequenceOfElemPtr& GetLastCreatedElems() const { return myLastCreatedElems; }
+  void                           CrearLastCreated();
+  SMESH_ComputeErrorPtr &        GetError() { return myError; }
+
+  /*!
+   * \brief Add element
+   */
+  SMDS_MeshElement* AddElement(const std::vector<const SMDS_MeshNode*> & nodes,
+                               const SMDSAbs_ElementType                 type,
+                               const bool                                isPoly,
+                               const int                                 ID = -1,
+                               const double                              ballDiameter=0.);
+  /*!
+   * \brief Add element
+   */
+  SMDS_MeshElement* AddElement(const std::vector<int>  & nodeIDs,
+                               const SMDSAbs_ElementType type,
+                               const bool                isPoly,
+                               const int                 ID = -1);
+
+  int Remove (const std::list< int >& theElemIDs, const bool isNodes);
   // Remove a node or an element.
   // Modify a compute state of sub-meshes which become empty
 
+  void Create0DElementsOnAllNodes( const TIDSortedElemSet& elements,
+                                   TIDSortedElemSet&       all0DElems);
+  // Create 0D elements on all nodes of the given object except those
+  // nodes on which a 0D element already exists. \a all0DElems returns
+  // all 0D elements found or created on nodes of \a elements
+
   bool InverseDiag (const SMDS_MeshElement * theTria1,
                     const SMDS_MeshElement * theTria2 );
   // Replace two neighbour triangles with ones built on the same 4 nodes
@@ -79,6 +120,17 @@ class SMESH_MeshEditor {
   bool Reorient (const SMDS_MeshElement * theElement);
   // Reverse theElement orientation
 
+  int Reorient2D (TIDSortedElemSet &       theFaces,
+                  const gp_Dir&            theDirection,
+                  const SMDS_MeshElement * theFace);
+  // Reverse theFaces whose orientation to be same as that of theFace
+  // oriented according to theDirection. Return nb of reoriented faces
+
+  int Reorient2DBy3D (TIDSortedElemSet & theFaces,
+                      TIDSortedElemSet & theVolumes,
+                      const bool         theOutsideNormal);
+  // Reorient faces basing on orientation of adjacent volumes.
+  // Return nb of reoriented faces
 
   /*!
    * \brief Fuse neighbour triangles into quadrangles.
@@ -86,48 +138,79 @@ class SMESH_MeshEditor {
    * \param theCriterion - Is used to choose a neighbour to fuse with.
    * \param theMaxAngle  - Is a max angle between element normals at which fusion
    *                       is still performed; theMaxAngle is mesured in radians.
-   * \retval bool - Success or not.
+   * \return bool - Success or not.
    */
-  bool TriToQuad (std::set<const SMDS_MeshElement*> &  theElems,
+  bool TriToQuad (TIDSortedElemSet &                   theElems,
                   SMESH::Controls::NumericalFunctorPtr theCriterion,
                   const double                         theMaxAngle);
-
   /*!
    * \brief Split quadrangles into triangles.
    * \param theElems     - The faces to be splitted.
    * \param theCriterion - Is used to choose a diagonal for splitting.
-   * \retval bool - Success or not.
+   * \return bool - Success or not.
    */
-  bool QuadToTri (std::set<const SMDS_MeshElement*> &  theElems,
+  bool QuadToTri (TIDSortedElemSet &                   theElems,
                   SMESH::Controls::NumericalFunctorPtr theCriterion);
-
   /*!
    * \brief Split quadrangles into triangles.
    * \param theElems  - The faces to be splitted.
    * \param the13Diag - Is used to choose a diagonal for splitting.
-   * \retval bool - Success or not.
+   * \return bool - Success or not.
    */
-  bool QuadToTri (std::set<const SMDS_MeshElement*> & theElems,
-                  const bool                          the13Diag);
+  bool QuadToTri (TIDSortedElemSet & theElems,
+                  const bool         the13Diag);
+  /*!
+   * \brief Split each of given quadrangles into 4 triangles.
+   * \param theElems - The faces to be splitted. If empty all faces are split.
+   */
+  void QuadTo4Tri (TIDSortedElemSet & theElems);
 
   /*!
    * \brief Find better diagonal for splitting.
    * \param theQuad      - The face to find better splitting of.
    * \param theCriterion - Is used to choose a diagonal for splitting.
-   * \retval int - 1 for 1-3 diagonal, 2 for 2-4, -1 - for errors.
+   * \return int - 1 for 1-3 diagonal, 2 for 2-4, -1 - for errors.
    */
   int BestSplit (const SMDS_MeshElement*              theQuad,
                  SMESH::Controls::NumericalFunctorPtr theCriterion);
 
 
+  typedef std::map < const SMDS_MeshElement*, int, TIDCompare > TFacetOfElem;
+
+    //!<2nd arg of SplitVolumes()
+  enum SplitVolumToTetraFlags { HEXA_TO_5 = 1, // split into tetrahedra
+                                HEXA_TO_6,
+                                HEXA_TO_24,
+                                HEXA_TO_2_PRISMS, // split into prisms
+                                HEXA_TO_4_PRISMS };
+  /*!
+   * \brief Split volumic elements into tetrahedra or prisms.
+   *        If facet ID < 0, element is split into tetrahedra,
+   *        else a hexahedron is split into prisms so that the given facet is
+   *        split into triangles
+   */
+  void SplitVolumes (const TFacetOfElem & theElems, const int theMethodFlags);
+
+  /*!
+   * \brief For hexahedra that will be split into prisms, finds facets to
+   *        split into triangles 
+   *  \param [in,out] theHexas - the hexahedra
+   *  \param [in]     theFacetNormal - facet normal
+   *  \param [out]    theFacets - the hexahedra and found facet IDs
+   */
+  void GetHexaFacetsToSplit( TIDSortedElemSet& theHexas,
+                             const gp_Ax1&     theFacetNormal,
+                             TFacetOfElem &    theFacets);
+
+
   enum SmoothMethod { LAPLACIAN = 0, CENTROIDAL };
 
-  void Smooth (std::set<const SMDS_MeshElement*> & theElements,
-               std::set<const SMDS_MeshNode*> &    theFixedNodes,
-               const SmoothMethod                  theSmoothMethod,
-               const int                           theNbIterations,
-               double                              theTgtAspectRatio = 1.0,
-               const bool                          the2D = true);
+  void Smooth (TIDSortedElemSet &               theElements,
+               std::set<const SMDS_MeshNode*> & theFixedNodes,
+               const SmoothMethod               theSmoothMethod,
+               const int                        theNbIterations,
+               double                           theTgtAspectRatio = 1.0,
+               const bool                       the2D = true);
   // Smooth theElements using theSmoothMethod during theNbIterations
   // or until a worst element has aspect ratio <= theTgtAspectRatio.
   // Aspect Ratio varies in range [1.0, inf].
@@ -137,79 +220,151 @@ class SMESH_MeshEditor {
   // If the2D, smoothing is performed using UV parameters of nodes
   // on geometrical faces
 
-
-  void RotationSweep (std::set<const SMDS_MeshElement*> & theElements,
-                      const gp_Ax1&                       theAxis,
-                      const double                        theAngle,
-                      const int                           theNbSteps,
-                      const double                        theToler);
+  typedef TIDTypeCompare TElemSort;
+  typedef std::map < const SMDS_MeshElement*,
+    std::list<const SMDS_MeshElement*>, TElemSort >                        TTElemOfElemListMap;
+  typedef std::map<const SMDS_MeshNode*, std::list<const SMDS_MeshNode*> > TNodeOfNodeListMap;
+  typedef TNodeOfNodeListMap::iterator                                     TNodeOfNodeListMapItr;
+  typedef std::vector<TNodeOfNodeListMapItr>                               TVecOfNnlmiMap;
+  typedef std::map<const SMDS_MeshElement*, TVecOfNnlmiMap, TElemSort >    TElemOfVecOfNnlmiMap;
+  typedef std::auto_ptr< std::list<int> > PGroupIDs;
+
+  PGroupIDs RotationSweep (TIDSortedElemSet & theElements,
+                           const gp_Ax1&      theAxis,
+                           const double       theAngle,
+                           const int          theNbSteps,
+                           const double       theToler,
+                           const bool         theMakeGroups,
+                           const bool         theMakeWalls=true);
   // Generate new elements by rotation of theElements around theAxis
   // by theAngle by theNbSteps
 
   /*!
-   * Auxilary flag for advanced extrusion.
+   * Flags of extrusion.
    * BOUNDARY: create or not boundary for result of extrusion
    * SEW:      try to use existing nodes or create new nodes in any case
+   * GROUPS:   to create groups
+   * BY_AVG_NORMAL: step size is measured along average normal to elements,
+   *                else step size is measured along average normal of any element
+   * USE_INPUT_ELEMS_ONLY: to use only input elements to compute extrusion direction
+   *                       for ExtrusionByNormal()
    */
   enum ExtrusionFlags {
     EXTRUSION_FLAG_BOUNDARY = 0x01,
-    EXTRUSION_FLAG_SEW = 0x02
+    EXTRUSION_FLAG_SEW = 0x02,
+    EXTRUSION_FLAG_GROUPS = 0x04,
+    EXTRUSION_FLAG_BY_AVG_NORMAL = 0x08,
+    EXTRUSION_FLAG_USE_INPUT_ELEMS_ONLY = 0x10
   };
-  
+
   /*!
-   * special structire for control of extrusion functionality
+   * Generator of nodes for extrusion functionality
    */
-  struct ExtrusParam {
-    gp_Dir myDir; // direction of extrusion
+  class SMESH_EXPORT ExtrusParam {
+    gp_Dir                          myDir;   // direction of extrusion
     Handle(TColStd_HSequenceOfReal) mySteps; // magnitudes for each step
-    SMESH_SequenceOfNode myNodes; // nodes for using in sewing
+    SMESH_SequenceOfNode            myNodes; // nodes for using in sewing
+    int                             myFlags; // see ExtrusionFlags
+    double                          myTolerance; // tolerance for sewing nodes
+    const TIDSortedElemSet*         myElemsToUse; // elements to use for extrusion by normal
+
+    int (ExtrusParam::*myMakeNodesFun)(SMESHDS_Mesh*                     mesh,
+                                       const SMDS_MeshNode*              srcNode,
+                                       std::list<const SMDS_MeshNode*> & newNodes,
+                                       const bool                        makeMediumNodes);
+
+  public:
+    ExtrusParam( const gp_Vec&  theStep,
+                 const int      theNbSteps,
+                 const int      theFlags = 0,
+                 const double   theTolerance = 1e-6);
+    ExtrusParam( const gp_Dir&                   theDir,
+                 Handle(TColStd_HSequenceOfReal) theSteps,
+                 const int                       theFlags = 0,
+                 const double                    theTolerance = 1e-6);
+    ExtrusParam( const double theStep,
+                 const int    theNbSteps,
+                 const int    theFlags,
+                 const int    theDim); // for extrusion by normal
+
+    SMESH_SequenceOfNode& ChangeNodes() { return myNodes; }
+    int& Flags()                   { return myFlags; }
+    bool ToMakeBoundary()    const { return myFlags & EXTRUSION_FLAG_BOUNDARY; }
+    bool ToMakeGroups()      const { return myFlags & EXTRUSION_FLAG_GROUPS; }
+    bool ToUseInpElemsOnly() const { return myFlags & EXTRUSION_FLAG_USE_INPUT_ELEMS_ONLY; }
+    int  NbSteps()           const { return mySteps->Length(); }
+
+    // stores elements to use for extrusion by normal, depending on
+    // state of EXTRUSION_FLAG_USE_INPUT_ELEMS_ONLY flag
+    void SetElementsToUse( const TIDSortedElemSet& elems );
+
+    // creates nodes and returns number of nodes added in \a newNodes
+    int MakeNodes( SMESHDS_Mesh*                     mesh,
+                   const SMDS_MeshNode*              srcNode,
+                   std::list<const SMDS_MeshNode*> & newNodes,
+                   const bool                        makeMediumNodes)
+    {
+      return (this->*myMakeNodesFun)( mesh, srcNode, newNodes, makeMediumNodes );
+    }
+  private:
+
+    int makeNodesByDir( SMESHDS_Mesh*                     mesh,
+                        const SMDS_MeshNode*              srcNode,
+                        std::list<const SMDS_MeshNode*> & newNodes,
+                        const bool                        makeMediumNodes);
+    int makeNodesByDirAndSew( SMESHDS_Mesh*                     mesh,
+                              const SMDS_MeshNode*              srcNode,
+                              std::list<const SMDS_MeshNode*> & newNodes,
+                              const bool                        makeMediumNodes);
+    int makeNodesByNormal2D( SMESHDS_Mesh*                     mesh,
+                             const SMDS_MeshNode*              srcNode,
+                             std::list<const SMDS_MeshNode*> & newNodes,
+                             const bool                        makeMediumNodes);
+    int makeNodesByNormal1D( SMESHDS_Mesh*                     mesh,
+                             const SMDS_MeshNode*              srcNode,
+                             std::list<const SMDS_MeshNode*> & newNodes,
+                             const bool                        makeMediumNodes);
+    // step iteration
+    void   beginStepIter( bool withMediumNodes );
+    bool   moreSteps();
+    double nextStep();
+    std::vector< double > myCurSteps;
+    bool                  myWithMediumNodes;
+    int                   myNextStep;
   };
 
   /*!
-   * Create new node in the mesh with given coordinates
-   * (auxilary for advanced extrusion)
-   */
-  const SMDS_MeshNode* CreateNode(const double x,
-                                  const double y,
-                                  const double z,
-                                  const double tolnode,
-                                  SMESH_SequenceOfNode& aNodes);
-
-  /*!
    * Generate new elements by extrusion of theElements
    * It is a method used in .idl file. All functionality
    * is implemented in the next method (see below) which
-   * is used in the cuurent method.
-   * param theElems - list of elements for extrusion
-   * param newElemsMap returns history of extrusion
-   * param theFlags set flags for performing extrusion (see description
+   * is used in the current method.
+   * @param theElems - list of elements for extrusion
+   * @param newElemsMap returns history of extrusion
+   * @param theFlags set flags for performing extrusion (see description
    *   of enum ExtrusionFlags for additional information)
-   * param theTolerance - uses for comparing locations of nodes if flag
+   * @param theTolerance - uses for comparing locations of nodes if flag
    *   EXTRUSION_FLAG_SEW is set
    */
-  void ExtrusionSweep
-           (set<const SMDS_MeshElement*> & theElems,
-            const gp_Vec&                  theStep,
-            const int                      theNbSteps,
-            TElemOfElemListMap&            newElemsMap,
-            const int                      theFlags = EXTRUSION_FLAG_BOUNDARY,
-            const double                   theTolerance = 1.e-6);
+  PGroupIDs ExtrusionSweep (TIDSortedElemSet &   theElems,
+                            const gp_Vec&        theStep,
+                            const int            theNbSteps,
+                            TTElemOfElemListMap& newElemsMap,
+                            const int            theFlags,
+                            const double         theTolerance = 1.e-6);
   
   /*!
    * Generate new elements by extrusion of theElements
-   * param theElems - list of elements for extrusion
-   * param newElemsMap returns history of extrusion
-   * param theFlags set flags for performing extrusion (see description
+   * @param theElems - list of elements for extrusion
+   * @param newElemsMap returns history of extrusion
+   * @param theFlags set flags for performing extrusion (see description
    *   of enum ExtrusionFlags for additional information)
-   * param theTolerance - uses for comparing locations of nodes if flag
+   * @param theTolerance - uses for comparing locations of nodes if flag
    *   EXTRUSION_FLAG_SEW is set
-   * param theParams - special structure for manage of extrusion
+   * @param theParams - special structure for manage of extrusion
    */
-  void ExtrusionSweep (set<const SMDS_MeshElement*> & theElems,
-                       ExtrusParam&                   theParams,
-                       TElemOfElemListMap&            newElemsMap,
-                       const int                      theFlags,
-                       const double                   theTolerance);
+  PGroupIDs ExtrusionSweep (TIDSortedElemSet &   theElems,
+                            ExtrusParam&         theParams,
+                            TTElemOfElemListMap& newElemsMap);
 
 
   // Generate new elements by extrusion of theElements 
@@ -225,48 +380,78 @@ class SMESH_MeshEditor {
     EXTR_CANT_GET_TANGENT
     };
   
-  Extrusion_Error ExtrusionAlongTrack (std::set<const SMDS_MeshElement*> & theElements,
-                                       SMESH_subMesh*                      theTrackPattern,
-                                       const SMDS_MeshNode*                theNodeStart,
-                                       const bool                          theHasAngles,
-                                       std::list<double>&                  theAngles,
-                                       const bool                          theHasRefPoint,
-                                       const gp_Pnt&                       theRefPoint);
+  Extrusion_Error ExtrusionAlongTrack (TIDSortedElemSet &   theElements,
+                                       SMESH_subMesh*       theTrackPattern,
+                                       const SMDS_MeshNode* theNodeStart,
+                                       const bool           theHasAngles,
+                                       std::list<double>&   theAngles,
+                                       const bool           theLinearVariation,
+                                       const bool           theHasRefPoint,
+                                       const gp_Pnt&        theRefPoint,
+                                       const bool           theMakeGroups);
+  Extrusion_Error ExtrusionAlongTrack (TIDSortedElemSet &   theElements,
+                                       SMESH_Mesh*          theTrackPattern,
+                                       const SMDS_MeshNode* theNodeStart,
+                                       const bool           theHasAngles,
+                                       std::list<double>&   theAngles,
+                                       const bool           theLinearVariation,
+                                       const bool           theHasRefPoint,
+                                       const gp_Pnt&        theRefPoint,
+                                       const bool           theMakeGroups);
   // Generate new elements by extrusion of theElements along path given by theTrackPattern,
   // theHasAngles are the rotation angles, base point can be given by theRefPoint
 
-  void Transform (std::set<const SMDS_MeshElement*> & theElements,
-                  const gp_Trsf&                      theTrsf,
-                  const bool                          theCopy);
+  PGroupIDs Transform (TIDSortedElemSet & theElements,
+                       const gp_Trsf&     theTrsf,
+                       const bool         theCopy,
+                       const bool         theMakeGroups,
+                       SMESH_Mesh*        theTargetMesh=0);
   // Move or copy theElements applying theTrsf to their nodes
 
   typedef std::list< std::list< const SMDS_MeshNode* > > TListOfListOfNodes;
 
-  void FindCoincidentNodes (std::set<const SMDS_MeshNode*> & theNodes,
-                            const double                     theTolerance,
-                            TListOfListOfNodes &             theGroupsOfNodes);
+  void FindCoincidentNodes (TIDSortedNodeSet &   theNodes,
+                            const double         theTolerance,
+                            TListOfListOfNodes & theGroupsOfNodes);
   // Return list of group of nodes close to each other within theTolerance.
   // Search among theNodes or in the whole mesh if theNodes is empty.
 
-  int SimplifyFace (const vector<const SMDS_MeshNode *> faceNodes,
-                    vector<const SMDS_MeshNode *>&      poly_nodes,
-                    vector<int>&                        quantities) const;
-  // Split face, defined by <faceNodes>, into several faces by repeating nodes.
-  // Is used by MergeNodes()
-
   void MergeNodes (TListOfListOfNodes & theNodeGroups);
   // In each group, the cdr of nodes are substituted by the first one
   // in all elements.
 
+  typedef std::list< std::list< int > > TListOfListOfElementsID;
+
+  void FindEqualElements(TIDSortedElemSet &        theElements,
+                         TListOfListOfElementsID & theGroupsOfElementsID);
+  // Return list of group of elements build on the same nodes.
+  // Search among theElements or in the whole mesh if theElements is empty.
+
+  void MergeElements(TListOfListOfElementsID & theGroupsOfElementsID);
+  // In each group remove all but first of elements.
+
   void MergeEqualElements();
   // Remove all but one of elements built on the same nodes.
   // Return nb of successfully merged groups.
 
+  int SimplifyFace (const std::vector<const SMDS_MeshNode *>& faceNodes,
+                    std::vector<const SMDS_MeshNode *>&       poly_nodes,
+                    std::vector<int>&                         quantities) const;
+  // Split face, defined by <faceNodes>, into several faces by repeating nodes.
+  // Is used by MergeNodes()
+
   static bool CheckFreeBorderNodes(const SMDS_MeshNode* theNode1,
                                    const SMDS_MeshNode* theNode2,
                                    const SMDS_MeshNode* theNode3 = 0);
   // Return true if the three nodes are on a free border
 
+  static bool FindFreeBorder (const SMDS_MeshNode*                  theFirstNode,
+                              const SMDS_MeshNode*                  theSecondNode,
+                              const SMDS_MeshNode*                  theLastNode,
+                              std::list< const SMDS_MeshNode* > &   theNodes,
+                              std::list< const SMDS_MeshElement* >& theFaces);
+  // Return nodes and faces of a free border if found 
+
   enum Sew_Error {
     SEW_OK,
     // for SewFreeBorder()
@@ -279,7 +464,8 @@ class SMESH_MeshEditor {
     SEW_DIFF_NB_OF_ELEMENTS,
     SEW_TOPO_DIFF_SETS_OF_ELEMENTS,
     SEW_BAD_SIDE1_NODES,
-    SEW_BAD_SIDE2_NODES
+    SEW_BAD_SIDE2_NODES,
+    SEW_INTERNAL_ERROR
     };
     
 
@@ -312,12 +498,12 @@ class SMESH_MeshEditor {
   // nodes are inserted.
   // Return false, if sewing failed.
 
-  Sew_Error SewSideElements (std::set<const SMDS_MeshElement*>& theSide1,
-                             std::set<const SMDS_MeshElement*>& theSide2,
-                             const SMDS_MeshNode*               theFirstNode1ToMerge,
-                             const SMDS_MeshNode*               theFirstNode2ToMerge,
-                             const SMDS_MeshNode*               theSecondNode1ToMerge,
-                             const SMDS_MeshNode*               theSecondNode2ToMerge);
+  Sew_Error SewSideElements (TIDSortedElemSet&    theSide1,
+                             TIDSortedElemSet&    theSide2,
+                             const SMDS_MeshNode* theFirstNode1ToMerge,
+                             const SMDS_MeshNode* theFirstNode2ToMerge,
+                             const SMDS_MeshNode* theSecondNode1ToMerge,
+                             const SMDS_MeshNode* theSecondNode2ToMerge);
   // Sew two sides of a mesh. Nodes belonging to theSide1 are
   // merged with nodes of elements of theSide2.
   // Number of elements in theSide1 and in theSide2 must be
@@ -339,44 +525,240 @@ class SMESH_MeshEditor {
   // insert theNodesToInsert into all volumes, containing link
   // theBetweenNode1 - theBetweenNode2, between theBetweenNode1 and theBetweenNode2.
 
-//  static int SortQuadNodes (const SMDS_Mesh * theMesh,
-//                            int               theNodeIds[] );
-//  // Set 4 nodes of a quadrangle face in a good order.
-//  // Swap 1<->2 or 2<->3 nodes and correspondingly return
-//  // 1 or 2 else 0.
-//
-//  static bool SortHexaNodes (const SMDS_Mesh * theMesh,
-//                             int               theNodeIds[] );
-//  // Set 8 nodes of a hexahedron in a good order.
-//  // Return success status
+  void ConvertToQuadratic(const bool theForce3d, const bool theToBiQuad);
+  void ConvertToQuadratic(const bool theForce3d,
+                          TIDSortedElemSet& theElements, const bool theToBiQuad);
+  // Converts all mesh to quadratic or bi-quadratic one, deletes old elements, 
+  // replacing them with quadratic or bi-quadratic ones with the same id.
+  // If theForce3d = 1; this results in the medium node lying at the 
+  // middle of the line segments connecting start and end node of a mesh element.
+  // If theForce3d = 0; this results in the medium node lying at the 
+  // geometrical edge from which the mesh element is built.
+
+  bool ConvertFromQuadratic();
+  void ConvertFromQuadratic(TIDSortedElemSet& theElements);
+  // Converts all mesh from quadratic to ordinary ones, deletes old quadratic elements, replacing 
+  // them with ordinary mesh elements with the same id.
+  // Returns true in case of success, false otherwise.
 
   static void AddToSameGroups (const SMDS_MeshElement* elemToAdd,
                                const SMDS_MeshElement* elemInGroups,
                                SMESHDS_Mesh *          aMesh);
-  // Add elemToAdd to the groups the elemInGroups belongs to
+  // Add elemToAdd to the all groups the elemInGroups belongs to
+
+  static void RemoveElemFromGroups (const SMDS_MeshElement* element,
+                                    SMESHDS_Mesh *          aMesh);
+  // remove element from the all groups
+
+  static void ReplaceElemInGroups (const SMDS_MeshElement* elemToRm,
+                                   const SMDS_MeshElement* elemToAdd,
+                                   SMESHDS_Mesh *          aMesh);
+  // replace elemToRm by elemToAdd in the all groups
 
-  static const SMDS_MeshElement*
-    FindFaceInSet(const SMDS_MeshNode*                     n1,
-                  const SMDS_MeshNode*                     n2,
-                  const std::set<const SMDS_MeshElement*>& elemSet,
-                  const std::set<const SMDS_MeshElement*>& avoidSet);
-  // Return a face having linked nodes n1 and n2 and which is
-  // - not in avoidSet,
-  // - in elemSet provided that !elemSet.empty()
+  static void ReplaceElemInGroups (const SMDS_MeshElement*                     elemToRm,
+                                   const std::vector<const SMDS_MeshElement*>& elemToAdd,
+                                   SMESHDS_Mesh *                              aMesh);
+  // replace elemToRm by elemToAdd in the all groups
+
+  /*!
+   * \brief Return nodes linked to the given one in elements of the type
+   */
+  static void GetLinkedNodes( const SMDS_MeshNode* node,
+                              TIDSortedElemSet &   linkedNodes,
+                              SMDSAbs_ElementType  type = SMDSAbs_All );
+
+  /*!
+   * \brief Find corresponding nodes in two sets of faces 
+    * \param theSide1 - first face set
+    * \param theSide2 - second first face
+    * \param theFirstNode1 - a boundary node of set 1
+    * \param theFirstNode2 - a node of set 2 corresponding to theFirstNode1
+    * \param theSecondNode1 - a boundary node of set 1 linked with theFirstNode1
+    * \param theSecondNode2 - a node of set 2 corresponding to theSecondNode1
+    * \param nReplaceMap - output map of corresponding nodes
+    * \return Sew_Error  - is a success or not
+   */
+  static Sew_Error FindMatchingNodes(std::set<const SMDS_MeshElement*>& theSide1,
+                                     std::set<const SMDS_MeshElement*>& theSide2,
+                                     const SMDS_MeshNode*               theFirstNode1,
+                                     const SMDS_MeshNode*               theFirstNode2,
+                                     const SMDS_MeshNode*               theSecondNode1,
+                                     const SMDS_MeshNode*               theSecondNode2,
+                                     TNodeNodeMap &                     theNodeReplaceMap);
+
+  /*!
+   * \brief Returns true if given node is medium
+    * \param n - node to check
+    * \param typeToCheck - type of elements containing the node to ask about node status
+    * \return bool - check result
+   */
+  static bool IsMedium(const SMDS_MeshNode*      node,
+                       const SMDSAbs_ElementType typeToCheck = SMDSAbs_All);
 
   int FindShape (const SMDS_MeshElement * theElem);
   // Return an index of the shape theElem is on
   // or zero if a shape not found
 
+  void DoubleElements( const TIDSortedElemSet& theElements );
 
-  SMESH_Mesh * GetMesh() { return myMesh; }
+  bool DoubleNodes( const std::list< int >& theListOfNodes, 
+                    const std::list< int >& theListOfModifiedElems );
+  
+  bool DoubleNodes( const TIDSortedElemSet& theElems, 
+                    const TIDSortedElemSet& theNodesNot,
+                    const TIDSortedElemSet& theAffectedElems );
+
+  bool AffectedElemGroupsInRegion( const TIDSortedElemSet& theElems,
+                                   const TIDSortedElemSet& theNodesNot,
+                                   const TopoDS_Shape&     theShape,
+                                   TIDSortedElemSet& theAffectedElems);
+
+  bool DoubleNodesInRegion( const TIDSortedElemSet& theElems, 
+                            const TIDSortedElemSet& theNodesNot,
+                            const TopoDS_Shape&     theShape );
+  
+  double OrientedAngle(const gp_Pnt& p0, const gp_Pnt& p1, const gp_Pnt& g1, const gp_Pnt& g2);
+
+  bool DoubleNodesOnGroupBoundaries( const std::vector<TIDSortedElemSet>& theElems,
+                                     bool                                 createJointElems,
+                                     bool                                 onAllBoundaries);
+
+  bool CreateFlatElementsOnFacesGroups( const std::vector<TIDSortedElemSet>& theElems );
+
+  void CreateHoleSkin(double radius,
+                      const TopoDS_Shape& theShape,
+                      SMESH_NodeSearcher* theNodeSearcher,
+                      const char* groupName,
+                      std::vector<double>&   nodesCoords,
+                      std::vector<std::vector<int> >& listOfListOfNodes);
+
+  /*!
+   * \brief Generated skin mesh (containing 2D cells) from 3D mesh
+   * The created 2D mesh elements based on nodes of free faces of boundary volumes
+   * \return TRUE if operation has been completed successfully, FALSE otherwise
+   */
+  bool Make2DMeshFrom3D();
+
+  enum Bnd_Dimension { BND_2DFROM3D, BND_1DFROM3D, BND_1DFROM2D };
 
-  SMESHDS_Mesh * GetMeshDS() { return myMesh->GetMeshDS(); }
+  int MakeBoundaryMesh(const TIDSortedElemSet& elements,
+                       Bnd_Dimension           dimension,
+                       SMESH_Group*            group = 0,
+                       SMESH_Mesh*             targetMesh = 0,
+                       bool                    toCopyElements = false,
+                       bool                    toCopyExistingBondary = false,
+                       bool                    toAddExistingBondary = false,
+                       bool                    aroundElements = false);
 
  private:
 
-  SMESH_Mesh * myMesh;
+  /*!
+   * \brief Convert elements contained in a submesh to quadratic
+   * \return int - nb of checked elements
+   */
+  int convertElemToQuadratic(SMESHDS_SubMesh *   theSm,
+                             SMESH_MesherHelper& theHelper,
+                             const bool          theForce3d);
+
+  /*!
+   * \brief Convert quadratic elements to linear ones and remove quadratic nodes
+   * \return nb of checked elements
+   */
+  int removeQuadElem( SMESHDS_SubMesh *    theSm,
+                      SMDS_ElemIteratorPtr theItr,
+                      const int            theShapeID);
+  /*!
+   * \brief Create groups of elements made during transformation
+   * \param nodeGens - nodes making corresponding myLastCreatedNodes
+   * \param elemGens - elements making corresponding myLastCreatedElems
+   * \param postfix - to append to names of new groups
+   * \param targetMesh - mesh to create groups in
+   * \param topPresent - is there "top" elements that are created by sweeping
+   */
+  PGroupIDs generateGroups(const SMESH_SequenceOfElemPtr& nodeGens,
+                           const SMESH_SequenceOfElemPtr& elemGens,
+                           const std::string&             postfix,
+                           SMESH_Mesh*                    targetMesh=0,
+                           const bool                     topPresent=true);
+  /*!
+   * \brief Create elements by sweeping an element
+   * \param elem - element to sweep
+   * \param newNodesItVec - nodes generated from each node of the element
+   * \param newElems - generated elements
+   * \param nbSteps - number of sweeping steps
+   * \param srcElements - to append elem for each generated element
+   */
+  void sweepElement(const SMDS_MeshElement*                    elem,
+                    const std::vector<TNodeOfNodeListMapItr> & newNodesItVec,
+                    std::list<const SMDS_MeshElement*>&        newElems,
+                    const int                                  nbSteps,
+                    SMESH_SequenceOfElemPtr&                   srcElements);
 
+  /*!
+   * \brief Create 1D and 2D elements around swept elements
+   * \param mapNewNodes - source nodes and ones generated from them
+   * \param newElemsMap - source elements and ones generated from them
+   * \param elemNewNodesMap - nodes generated from each node of each element
+   * \param elemSet - all swept elements
+   * \param nbSteps - number of sweeping steps
+   * \param srcElements - to append elem for each generated element
+   */
+  void makeWalls (TNodeOfNodeListMap &     mapNewNodes,
+                  TTElemOfElemListMap &    newElemsMap,
+                  TElemOfVecOfNnlmiMap &   elemNewNodesMap,
+                  TIDSortedElemSet&        elemSet,
+                  const int                nbSteps,
+                  SMESH_SequenceOfElemPtr& srcElements);
+
+  struct SMESH_MeshEditor_PathPoint
+  {
+    gp_Pnt myPnt;
+    gp_Dir myTgt;
+    double myAngle, myPrm;
+
+    SMESH_MeshEditor_PathPoint(): myPnt(99., 99., 99.), myTgt(1.,0.,0.), myAngle(0), myPrm(0) {}
+    void          SetPnt      (const gp_Pnt& aP3D)  { myPnt  =aP3D; }
+    void          SetTangent  (const gp_Dir& aTgt)  { myTgt  =aTgt; }
+    void          SetAngle    (const double& aBeta) { myAngle=aBeta; }
+    void          SetParameter(const double& aPrm)  { myPrm  =aPrm; }
+    const gp_Pnt& Pnt         ()const               { return myPnt; }
+    const gp_Dir& Tangent     ()const               { return myTgt; }
+    double        Angle       ()const               { return myAngle; }
+    double        Parameter   ()const               { return myPrm; }
+  };
+  Extrusion_Error MakeEdgePathPoints(std::list<double>&                     aPrms,
+                                     const TopoDS_Edge&                     aTrackEdge,
+                                     bool                                   aFirstIsStart,
+                                     std::list<SMESH_MeshEditor_PathPoint>& aLPP);
+  Extrusion_Error MakeExtrElements(TIDSortedElemSet&                      theElements,
+                                   std::list<SMESH_MeshEditor_PathPoint>& theFullList,
+                                   const bool                             theHasAngles,
+                                   std::list<double>&                     theAngles,
+                                   const bool                             theLinearVariation,
+                                   const bool                             theHasRefPoint,
+                                   const gp_Pnt&                          theRefPoint,
+                                   const bool                             theMakeGroups);
+  void LinearAngleVariation(const int     NbSteps,
+                            list<double>& theAngles);
+
+  bool doubleNodes( SMESHDS_Mesh*                                           theMeshDS,
+                    const TIDSortedElemSet&                                 theElems,
+                    const TIDSortedElemSet&                                 theNodesNot,
+                    std::map< const SMDS_MeshNode*, const SMDS_MeshNode* >& theNodeNodeMap,
+                    const bool                                              theIsDoubleElem );
+
+  void copyPosition( const SMDS_MeshNode* from,
+                     const SMDS_MeshNode* to );
+
+private:
+
+  SMESH_Mesh *            myMesh;
+
+  // Nodes and elements created during last operation
+  SMESH_SequenceOfElemPtr myLastCreatedNodes, myLastCreatedElems;
+
+  // Description of error/warning occured during last operation
+  SMESH_ComputeErrorPtr   myError;
 };
 
 #endif