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Merge from PortingMED3 07Apr11
[modules/smesh.git] / src / SMESH_I / SMESH_Gen_i.cxx
index 52bf0094880be4c14facda3ff1264f1406ad9980..8ff2c08ff45c5cb5d0faae23099ae3208cb5f38b 100644 (file)
@@ -1,4 +1,4 @@
-//  Copyright (C) 2007-2008  CEA/DEN, EDF R&D, OPEN CASCADE
+//  Copyright (C) 2007-2010  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
@@ -23,7 +23,7 @@
 //  File   : SMESH_Gen_i.cxx
 //  Author : Paul RASCLE, EDF
 //  Module : SMESH
-//
+
 #include <TopExp.hxx>
 #include <TopExp_Explorer.hxx>
 #include <TopoDS.hxx>
@@ -54,6 +54,7 @@
 
 #ifdef WNT
  #include <windows.h>
+ #include <process.h>
 #else
  #include <dlfcn.h>
 #endif
 
 #include "SMDS_EdgePosition.hxx"
 #include "SMDS_FacePosition.hxx"
-#include "SMDS_VertexPosition.hxx"
-#include "SMDS_SpacePosition.hxx"
 #include "SMDS_PolyhedralVolumeOfNodes.hxx"
+#include "SMDS_SetIterator.hxx"
+#include "SMDS_SpacePosition.hxx"
+#include "SMDS_VertexPosition.hxx"
 
 #include CORBA_SERVER_HEADER(SMESH_Group)
 #include CORBA_SERVER_HEADER(SMESH_Filter)
 
 #include "GEOM_Client.hxx"
 #include "Utils_ExceptHandlers.hxx"
+#include "memoire.h"
 #include "Basics_Utils.hxx"
 
 #include <map>
@@ -152,9 +155,9 @@ PortableServer::ServantBase_var SMESH_Gen_i::GetServant( CORBA::Object_ptr theOb
   try {
     PortableServer::Servant aServant = GetPOA()->reference_to_servant( theObject );
     return aServant;
-  } 
+  }
   catch (...) {
-    INFOS( "GetServant - Unknown exception was caught!!!" ); 
+    INFOS( "GetServant - Unknown exception was caught!!!" );
     return NULL;
   }
 }
@@ -191,7 +194,7 @@ CORBA::Object_var SMESH_Gen_i::SObjectToObject( SALOMEDS::SObject_ptr theSObject
 /*!
  *  GetNS [ static ]
  *
- *  Get SALOME_NamingService object 
+ *  Get SALOME_NamingService object
  */
 //=============================================================================
 
@@ -211,7 +214,7 @@ SALOME_NamingService* SMESH_Gen_i::GetNS()
  *
  *  Get SALOME_LifeCycleCORBA object
  */
-//=============================================================================     
+//=============================================================================
 SALOME_LifeCycleCORBA*  SMESH_Gen_i::GetLCC() {
   if ( myLCC == NULL ) {
     myLCC = new SALOME_LifeCycleCORBA( GetNS() );
@@ -226,14 +229,14 @@ SALOME_LifeCycleCORBA*  SMESH_Gen_i::GetLCC() {
  *
  *  Get GEOM::GEOM_Gen reference
  */
-//=============================================================================     
+//=============================================================================
 GEOM::GEOM_Gen_ptr SMESH_Gen_i::GetGeomEngine() {
   //CCRT GEOM::GEOM_Gen_var aGeomEngine =
   //CCRT   GEOM::GEOM_Gen::_narrow( GetLCC()->FindOrLoad_Component("FactoryServer","GEOM") );
   //CCRT return aGeomEngine._retn();
   if(CORBA::is_nil(myGeomGen))
   {
-    Engines::Component_ptr temp=GetLCC()->FindOrLoad_Component("FactoryServer","GEOM");
+    Engines::EngineComponent_ptr temp=GetLCC()->FindOrLoad_Component("FactoryServer","GEOM");
     myGeomGen=GEOM::GEOM_Gen::_narrow(temp);
   }
   return myGeomGen;
@@ -254,7 +257,7 @@ SMESH_Gen_i::SMESH_Gen_i()
 
 //=============================================================================
 /*!
- *  SMESH_Gen_i::SMESH_Gen_i 
+ *  SMESH_Gen_i::SMESH_Gen_i
  *
  *  Standard constructor, used with Container
  */
@@ -262,8 +265,8 @@ SMESH_Gen_i::SMESH_Gen_i()
 
 SMESH_Gen_i::SMESH_Gen_i( CORBA::ORB_ptr            orb,
                           PortableServer::POA_ptr   poa,
-                          PortableServer::ObjectId* contId, 
-                          const char*               instanceName, 
+                          PortableServer::ObjectId* contId,
+                          const char*               instanceName,
                           const char*               interfaceName )
      : Engines_Component_i( orb, poa, contId, instanceName, interfaceName )
 {
@@ -271,10 +274,10 @@ SMESH_Gen_i::SMESH_Gen_i( CORBA::ORB_ptr            orb,
 
   myOrb = CORBA::ORB::_duplicate(orb);
   myPoa = PortableServer::POA::_duplicate(poa);
-  
+
   _thisObj = this ;
   _id = myPoa->activate_object( _thisObj );
-  
+
   myIsEmbeddedMode = false;
   myShapeReader = NULL;  // shape reader
   mySMESHGen = this;
@@ -332,10 +335,10 @@ SMESH_Gen_i::~SMESH_Gen_i()
   }
   myStudyContextMap.clear();
   // delete shape reader
-  if ( !myShapeReader ) 
+  if ( !myShapeReader )
     delete myShapeReader;
 }
-  
+
 //=============================================================================
 /*!
  *  SMESH_Gen_i::createHypothesis
@@ -373,7 +376,7 @@ SMESH::SMESH_Hypothesis_ptr SMESH_Gen_i::createHypothesis(const char* theHypName
     }
     else
     {
-      //try to use new format 
+      //try to use new format
 #ifdef WNT
       aPlatformLibName = new char[ libNameLen + 5 ];
       aPlatformLibName[0] = '\0';
@@ -459,7 +462,7 @@ SMESH::SMESH_Hypothesis_ptr SMESH_Gen_i::createHypothesis(const char* theHypName
   // activate the CORBA servant of hypothesis
   hypothesis_i = SMESH::SMESH_Hypothesis::_narrow( myHypothesis_i->_this() );
   int nextId = RegisterObject( hypothesis_i );
-  if(MYDEBUG) MESSAGE( "Add hypo to map with id = "<< nextId );  
+  if(MYDEBUG) MESSAGE( "Add hypo to map with id = "<< nextId );
 
   return hypothesis_i._retn();
 }
@@ -482,6 +485,7 @@ SMESH::SMESH_Mesh_ptr SMESH_Gen_i::createMesh()
     // create a new mesh object servant, store it in a map in study context
     SMESH_Mesh_i* meshServant = new SMESH_Mesh_i( GetPOA(), this, GetCurrentStudyID() );
     // create a new mesh object
+    MESSAGE("myIsEmbeddedMode " << myIsEmbeddedMode);
     meshServant->SetImpl( myGen.CreateMesh( GetCurrentStudyID(), myIsEmbeddedMode ));
 
     // activate the CORBA servant of Mesh
@@ -506,7 +510,7 @@ SMESH::SMESH_Mesh_ptr SMESH_Gen_i::createMesh()
 GEOM_Client* SMESH_Gen_i::GetShapeReader()
 {
   // create shape reader if necessary
-  if ( !myShapeReader ) 
+  if ( !myShapeReader )
     myShapeReader = new GEOM_Client(GetContainerRef());
   ASSERT( myShapeReader );
   return myShapeReader;
@@ -539,6 +543,7 @@ void SMESH_Gen_i::SetGeomEngine( GEOM::GEOM_Gen_ptr geomcompo )
 void SMESH_Gen_i::SetEmbeddedMode( CORBA::Boolean theMode )
 {
   myIsEmbeddedMode = theMode;
+  MESSAGE("myIsEmbeddedMode " << myIsEmbeddedMode);
 
   if ( !myIsEmbeddedMode ) {
     //PAL10867: disable signals catching with "noexcepthandler" option
@@ -588,12 +593,12 @@ void SMESH_Gen_i::SetCurrentStudy( SALOMEDS::Study_ptr theStudy )
   // create study context, if it doesn't exist and set current study
   int studyId = GetCurrentStudyID();
   if ( myStudyContextMap.find( studyId ) == myStudyContextMap.end() ) {
-    myStudyContextMap[ studyId ] = new StudyContext;      
+    myStudyContextMap[ studyId ] = new StudyContext;
   }
 
   // myCurrentStudy may be nil
   if ( !CORBA::is_nil( myCurrentStudy ) ) {
-    SALOMEDS::StudyBuilder_var aStudyBuilder = myCurrentStudy->NewBuilder(); 
+    SALOMEDS::StudyBuilder_var aStudyBuilder = myCurrentStudy->NewBuilder();
     if( !myCurrentStudy->FindComponent( "GEOM" )->_is_nil() )
       aStudyBuilder->LoadWith( myCurrentStudy->FindComponent( "GEOM" ), GetGeomEngine() );
 
@@ -633,7 +638,7 @@ SALOMEDS::Study_ptr SMESH_Gen_i::GetCurrentStudy()
 
 //=============================================================================
 /*!
- *  SMESH_Gen_i::GetCurrentStudyContext 
+ *  SMESH_Gen_i::GetCurrentStudyContext
  *
  *  Get current study context
  */
@@ -649,7 +654,7 @@ StudyContext* SMESH_Gen_i::GetCurrentStudyContext()
 
 //=============================================================================
 /*!
- *  SMESH_Gen_i::CreateHypothesis 
+ *  SMESH_Gen_i::CreateHypothesis
  *
  *  Create hypothesis/algorothm of given type and publish it in the study
  */
@@ -791,7 +796,7 @@ void SMESH_Gen_i::SetBoundaryBoxSegmentation( CORBA::Long theNbSegments )
 void SMESH_Gen_i::SetDefaultNbSegments(CORBA::Long theNbSegments)
   throw ( SALOME::SALOME_Exception )
 {
-  if ( theNbSegments )
+  if ( theNbSegments > 0 )
     myGen.SetDefaultNbSegments( int(theNbSegments) );
   else
     THROW_SALOME_CORBA_EXCEPTION( "non-positive number of segments", SALOME::BAD_PARAM );
@@ -887,7 +892,7 @@ SMESH::SMESH_Mesh_ptr SMESH_Gen_i::CreateMeshesFromUNV( const char* theFileName
     aStudyBuilder->CommitCommand();
     if ( !aSO->_is_nil() ) {
       // Update Python script
-      TPythonDump() << aSO << " = smeshgen.CreateMeshesFromUNV('" << theFileName << "')";
+      TPythonDump() << aSO << " = smeshgen.CreateMeshesFromUNV(r'" << theFileName << "')";
     }
   }
 
@@ -896,8 +901,9 @@ SMESH::SMESH_Mesh_ptr SMESH_Gen_i::CreateMeshesFromUNV( const char* theFileName
   aServant->ImportUNVFile( theFileName );
 
   // Dump creation of groups
-  aServant->GetGroups();
+  SMESH::ListOfGroups_var groups = aServant->GetGroups();
 
+  aServant->GetImpl().GetMeshDS()->Modified();
   return aMesh._retn();
 }
 
@@ -930,23 +936,21 @@ SMESH::mesh_array* SMESH_Gen_i::CreateMeshesFromMED( const char* theFileName,
   // Python Dump
   TPythonDump aPythonDump;
   aPythonDump << "([";
-  //TCollection_AsciiString aStr ("([");
 
   if (theStatus == SMESH::DRS_OK) {
     SALOMEDS::StudyBuilder_var aStudyBuilder = myCurrentStudy->NewBuilder();
     aStudyBuilder->NewCommand();  // There is a transaction
     aResult->length( aNames.size() );
     int i = 0;
-    
+
     // Iterate through all meshes and create mesh objects
     for ( list<string>::iterator it = aNames.begin(); it != aNames.end(); it++ ) {
       // Python Dump
-      //if (i > 0) aStr += ", ";
       if (i > 0) aPythonDump << ", ";
 
       // create mesh
       SMESH::SMESH_Mesh_var mesh = createMesh();
-      
+
       // publish mesh in the study
       SALOMEDS::SObject_var aSO;
       if ( CanPublishInStudy( mesh ) )
@@ -954,12 +958,9 @@ SMESH::mesh_array* SMESH_Gen_i::CreateMeshesFromMED( const char* theFileName,
       if ( !aSO->_is_nil() ) {
         // Python Dump
         aPythonDump << aSO;
-        //aStr += aSO->GetID();
       } else {
         // Python Dump
         aPythonDump << "mesh_" << i;
-//         aStr += "mesh_";
-//         aStr += TCollection_AsciiString(i);
       }
 
       // Read mesh data (groups are published automatically by ImportMEDFile())
@@ -971,16 +972,17 @@ SMESH::mesh_array* SMESH_Gen_i::CreateMeshesFromMED( const char* theFileName,
         theStatus = status1;
 
       aResult[i++] = SMESH::SMESH_Mesh::_duplicate( mesh );
+      meshServant->GetImpl().GetMeshDS()->Modified();
     }
     aStudyBuilder->CommitCommand();
   }
 
   // Update Python script
-  aPythonDump << "], status) = " << this << ".CreateMeshesFromMED('" << theFileName << "')";
+  aPythonDump << "], status) = " << this << ".CreateMeshesFromMED(r'" << theFileName << "')";
   }
   // Dump creation of groups
   for ( int i = 0; i < aResult->length(); ++i )
-    aResult[ i ]->GetGroups();
+    SMESH::ListOfGroups_var groups = aResult[ i ]->GetGroups();
 
   return aResult._retn();
 }
@@ -1010,13 +1012,14 @@ SMESH::SMESH_Mesh_ptr SMESH_Gen_i::CreateMeshesFromSTL( const char* theFileName
     aStudyBuilder->CommitCommand();
     if ( !aSO->_is_nil() ) {
       // Update Python script
-      TPythonDump() << aSO << " = " << this << ".CreateMeshesFromSTL('" << theFileName << "')";
+      TPythonDump() << aSO << " = " << this << ".CreateMeshesFromSTL(r'" << theFileName << "')";
     }
   }
 
   SMESH_Mesh_i* aServant = dynamic_cast<SMESH_Mesh_i*>( GetServant( aMesh ).in() );
   ASSERT( aServant );
   aServant->ImportSTLFile( theFileName );
+  aServant->GetImpl().GetMeshDS()->Modified();
   return aMesh._retn();
 }
 
@@ -1036,7 +1039,7 @@ CORBA::Boolean SMESH_Gen_i::IsReadyToCompute( SMESH::SMESH_Mesh_ptr theMesh,
   if(MYDEBUG) MESSAGE( "SMESH_Gen_i::IsReadyToCompute" );
 
   if ( CORBA::is_nil( theShapeObject ) )
-    THROW_SALOME_CORBA_EXCEPTION( "bad shape object reference", 
+    THROW_SALOME_CORBA_EXCEPTION( "bad shape object reference",
                                   SALOME::BAD_PARAM );
 
   if ( CORBA::is_nil( theMesh ) )
@@ -1104,7 +1107,7 @@ SALOMEDS::SObject_ptr SMESH_Gen_i::GetAlgoSO(const ::SMESH_Algo* algo)
  */
 //================================================================================
 
-SMESH::compute_error_array* SMESH_Gen_i::GetComputeErrors( SMESH::SMESH_Mesh_ptr theMesh, 
+SMESH::compute_error_array* SMESH_Gen_i::GetComputeErrors( SMESH::SMESH_Mesh_ptr theMesh,
                                                            GEOM::GEOM_Object_ptr theSubObject )
   throw ( SALOME::SALOME_Exception )
 {
@@ -1126,7 +1129,7 @@ SMESH::compute_error_array* SMESH_Gen_i::GetComputeErrors( SMESH::SMESH_Mesh_ptr
         shape = GeomObjectToShape( theSubObject );
       else
         shape = SMESH_Mesh::PseudoShape();
-      
+
       ::SMESH_Mesh& mesh = meshServant->GetImpl();
 
       error_array->length( mesh.GetMeshDS()->MaxShapeIndex() );
@@ -1166,7 +1169,7 @@ SMESH::compute_error_array* SMESH_Gen_i::GetComputeErrors( SMESH::SMESH_Mesh_ptr
   return error_array._retn();
 }
 
-// 
+//
 //================================================================================
 /*!
  * \brief Return mesh elements preventing computation of a subshape
@@ -1261,7 +1264,7 @@ SMESH_Gen_i::GetBadInputElements( SMESH::SMESH_Mesh_ptr theMesh,
  */
 //================================================================================
 
-SMESH::algo_error_array* SMESH_Gen_i::GetAlgoState( SMESH::SMESH_Mesh_ptr theMesh, 
+SMESH::algo_error_array* SMESH_Gen_i::GetAlgoState( SMESH::SMESH_Mesh_ptr theMesh,
                                                     GEOM::GEOM_Object_ptr theSubObject )
       throw ( SALOME::SALOME_Exception )
 {
@@ -1284,7 +1287,7 @@ SMESH::algo_error_array* SMESH_Gen_i::GetAlgoState( SMESH::SMESH_Mesh_ptr theMes
         myLocShape = GeomObjectToShape( theSubObject );
       else
         myLocShape = SMESH_Mesh::PseudoShape();
-      
+
       ::SMESH_Mesh& myLocMesh = meshServant->GetImpl();
       list< ::SMESH_Gen::TAlgoStateError > error_list;
       list< ::SMESH_Gen::TAlgoStateError >::iterator error;
@@ -1337,7 +1340,7 @@ SMESH::long_array* SMESH_Gen_i::GetSubShapesId( GEOM::GEOM_Object_ptr theMainSha
   try
     {
       TopoDS_Shape myMainShape = GeomObjectToShape(theMainShapeObject);
-      TopTools_IndexedMapOfShape myIndexToShape;      
+      TopTools_IndexedMapOfShape myIndexToShape;
       TopExp::MapShapes(myMainShape,myIndexToShape);
 
       for ( int i = 0; i < theListOfSubShapeObject.length(); i++ )
@@ -1399,11 +1402,12 @@ CORBA::Boolean SMESH_Gen_i::Compute( SMESH::SMESH_Mesh_ptr theMesh,
                                      GEOM::GEOM_Object_ptr theShapeObject )
      throw ( SALOME::SALOME_Exception )
 {
+  MEMOSTAT;
   Unexpect aCatch(SALOME_SalomeException);
   if(MYDEBUG) MESSAGE( "SMESH_Gen_i::Compute" );
 
   if ( CORBA::is_nil( theShapeObject ) && theMesh->HasShapeToMesh())
-    THROW_SALOME_CORBA_EXCEPTION( "bad shape object reference", 
+    THROW_SALOME_CORBA_EXCEPTION( "bad shape object reference",
                                   SALOME::BAD_PARAM );
 
   if ( CORBA::is_nil( theMesh ) )
@@ -1429,7 +1433,13 @@ CORBA::Boolean SMESH_Gen_i::Compute( SMESH::SMESH_Mesh_ptr theMesh,
         myLocShape = SMESH_Mesh::PseudoShape();
       // call implementation compute
       ::SMESH_Mesh& myLocMesh = meshServant->GetImpl();
-      return myGen.Compute( myLocMesh, myLocShape);
+#ifdef WITH_SMESH_CANCEL_COMPUTE
+      myGen.PrepareCompute( myLocMesh, myLocShape);
+#endif
+      bool ok = myGen.Compute( myLocMesh, myLocShape);
+      meshServant->CreateGroupServants(); // algos can create groups (issue 0020918)
+      myLocMesh.GetMeshDS()->Modified();
+      return ok;
     }
   }
   catch ( std::bad_alloc ) {
@@ -1444,6 +1454,29 @@ CORBA::Boolean SMESH_Gen_i::Compute( SMESH::SMESH_Mesh_ptr theMesh,
   return false;
 }
 
+//=============================================================================
+/*!
+ *  SMESH_Gen_i::CancelCompute
+ *
+ *  Cancel Compute mesh on a shape
+ */
+//=============================================================================
+
+void SMESH_Gen_i::CancelCompute( SMESH::SMESH_Mesh_ptr theMesh,
+                                 GEOM::GEOM_Object_ptr theShapeObject )
+{
+#ifdef WITH_SMESH_CANCEL_COMPUTE
+  SMESH_Mesh_i* meshServant = dynamic_cast<SMESH_Mesh_i*>( GetServant( theMesh ).in() );
+  ::SMESH_Mesh& myLocMesh = meshServant->GetImpl();
+  TopoDS_Shape myLocShape;
+  if(theMesh->HasShapeToMesh())
+    myLocShape = GeomObjectToShape( theShapeObject );
+  else
+    myLocShape = SMESH_Mesh::PseudoShape();
+  myGen.CancelCompute( myLocMesh, myLocShape);
+#endif
+}
+
 //=============================================================================
 /*!
  *  SMESH_Gen_i::Precompute
@@ -1462,7 +1495,7 @@ SMESH::MeshPreviewStruct* SMESH_Gen_i::Precompute( SMESH::SMESH_Mesh_ptr theMesh
   if(MYDEBUG) MESSAGE( "SMESH_Gen_i::Precompute" );
 
   if ( CORBA::is_nil( theShapeObject ) && theMesh->HasShapeToMesh())
-    THROW_SALOME_CORBA_EXCEPTION( "bad shape object reference", 
+    THROW_SALOME_CORBA_EXCEPTION( "bad shape object reference",
                                   SALOME::BAD_PARAM );
 
   if ( CORBA::is_nil( theMesh ) )
@@ -1512,7 +1545,7 @@ SMESH::MeshPreviewStruct* SMESH_Gen_i::Precompute( SMESH::SMESH_Mesh_ptr theMesh
           SMESH_subMesh* sm = myLocMesh.GetSubMeshContaining(*idIt);
           if ( !sm || !sm->IsMeshComputed() )
             continue;
-          
+
           const TopoDS_Shape& aSh = sm->GetSubShape();
           const int shDim = myGen.GetShapeDim( aSh );
           if ( shDim < 1 || shDim > theDimension )
@@ -1649,7 +1682,7 @@ SMESH::long_array* SMESH_Gen_i::Evaluate(SMESH::SMESH_Mesh_ptr theMesh,
   if(MYDEBUG) MESSAGE( "SMESH_Gen_i::Evaluate" );
 
   if ( CORBA::is_nil( theShapeObject ) && theMesh->HasShapeToMesh())
-    THROW_SALOME_CORBA_EXCEPTION( "bad shape object reference", 
+    THROW_SALOME_CORBA_EXCEPTION( "bad shape object reference",
                                   SALOME::BAD_PARAM );
 
   if ( CORBA::is_nil( theMesh ) )
@@ -1686,13 +1719,22 @@ SMESH::long_array* SMESH_Gen_i::Evaluate(SMESH::SMESH_Mesh_ptr theMesh,
       MapShapeNbElemsItr anIt = aResMap.begin();
       for(; anIt!=aResMap.end(); anIt++) {
         const vector<int>& aVec = (*anIt).second;
-        for(i = SMESH::Entity_Node; i < SMESH::Entity_Last; i++) {
-          nbels[i] += aVec[i];
+        for(i = SMESH::Entity_Node; i < aVec.size(); i++) {
+          int nbElem = aVec[i];
+          if ( nbElem < 0 ) // algo failed, check that it has reported a message
+          {
+            SMESH_subMesh* sm = anIt->first;
+            SMESH_ComputeErrorPtr& error = sm->GetComputeError();
+            const SMESH_Algo* algo = myGen.GetAlgo( myLocMesh, sm->GetSubShape());
+            if ( (algo && !error.get()) || error->IsOK() )
+              error.reset( new SMESH_ComputeError( COMPERR_ALGO_FAILED,"Failed to evaluate",algo));
+          }
+          else
+          {
+            nbels[i] += aVec[i];
+          }
         }
       }
-#ifdef _DEBUG_
-      cout<<endl;
-#endif
       return nbels._retn();
     }
   }
@@ -1726,7 +1768,7 @@ SMESH_Gen_i::GetGeometryByMeshElement( SMESH::SMESH_Mesh_ptr  theMesh,
   throw ( SALOME::SALOME_Exception )
 {
   Unexpect aCatch(SALOME_SalomeException);
+
   GEOM::GEOM_Object_var geom = FindGeometryByMeshElement(theMesh, theElementID);
   if ( !geom->_is_nil() ) {
     GEOM::GEOM_Object_var mainShape = theMesh->GetShapeToMesh();
@@ -1847,8 +1889,8 @@ SMESH_Gen_i::FindGeometryByMeshElement( SMESH::SMESH_Mesh_ptr  theMesh,
 //================================================================================
 
 SMESH::SMESH_Mesh_ptr SMESH_Gen_i::Concatenate(const SMESH::mesh_array& theMeshesArray,
-                                               CORBA::Boolean           theUniteIdenticalGroups, 
-                                               CORBA::Boolean           theMergeNodesAndElements, 
+                                               CORBA::Boolean           theUniteIdenticalGroups,
+                                               CORBA::Boolean           theMergeNodesAndElements,
                                                CORBA::Double            theMergeTolerance)
   throw ( SALOME::SALOME_Exception )
 {
@@ -1870,8 +1912,8 @@ SMESH::SMESH_Mesh_ptr SMESH_Gen_i::Concatenate(const SMESH::mesh_array& theMeshe
 
 SMESH::SMESH_Mesh_ptr
 SMESH_Gen_i::ConcatenateWithGroups(const SMESH::mesh_array& theMeshesArray,
-                                   CORBA::Boolean           theUniteIdenticalGroups, 
-                                   CORBA::Boolean           theMergeNodesAndElements, 
+                                   CORBA::Boolean           theUniteIdenticalGroups,
+                                   CORBA::Boolean           theMergeNodesAndElements,
                                    CORBA::Double            theMergeTolerance)
   throw ( SALOME::SALOME_Exception )
 {
@@ -1892,8 +1934,8 @@ SMESH_Gen_i::ConcatenateWithGroups(const SMESH::mesh_array& theMeshesArray,
 
 SMESH::SMESH_Mesh_ptr
 SMESH_Gen_i::ConcatenateCommon(const SMESH::mesh_array& theMeshesArray,
-                               CORBA::Boolean           theUniteIdenticalGroups, 
-                               CORBA::Boolean           theMergeNodesAndElements, 
+                               CORBA::Boolean           theUniteIdenticalGroups,
+                               CORBA::Boolean           theMergeNodesAndElements,
                                CORBA::Double            theMergeTolerance,
                                CORBA::Boolean           theCommonGroups)
   throw ( SALOME::SALOME_Exception )
@@ -1908,12 +1950,13 @@ SMESH_Gen_i::ConcatenateCommon(const SMESH::mesh_array& theMeshesArray,
 
   // create mesh
   SMESH::SMESH_Mesh_var aNewMesh = CreateEmptyMesh();
-  
+
+  SMESHDS_Mesh* aNewMeshDS = 0;
   if ( !aNewMesh->_is_nil() ) {
     SMESH_Mesh_i* aNewImpl = dynamic_cast<SMESH_Mesh_i*>( GetServant( aNewMesh ).in() );
     if ( aNewImpl ) {
       ::SMESH_Mesh& aLocMesh = aNewImpl->GetImpl();
-      SMESHDS_Mesh* aNewMeshDS = aLocMesh.GetMeshDS();
+      aNewMeshDS = aLocMesh.GetMeshDS();
 
       TGroupsMap aGroupsMap;
       TListOfNewGroups aListOfNewGroups;
@@ -1982,18 +2025,18 @@ SMESH_Gen_i::ConcatenateCommon(const SMESH::mesh_array& theMeshesArray,
               // creates a corresponding element on existent nodes in new mesh
               if ( anElem->IsPoly() && anElemType == SMDSAbs_Volume )
                 {
-                  const SMDS_PolyhedralVolumeOfNodes* aVolume =
-                    dynamic_cast<const SMDS_PolyhedralVolumeOfNodes*> (anElem);
+                  const SMDS_VtkVolume* aVolume =
+                    dynamic_cast<const SMDS_VtkVolume*> (anElem);
                   if ( aVolume ) {
-                    aNewElem = aNewMeshDS->AddPolyhedralVolume(aNodesArray, 
-                                                               aVolume->GetQuanities());
+                    aNewElem = aNewMeshDS->AddPolyhedralVolume(aNodesArray,
+                                                               aVolume->GetQuantities());
                     elemsMap.insert(make_pair(anElem->GetID(), aNewElem->GetID()));
                     if( theCommonGroups )
                       anIDsVolumes[anNbVolumes++] = aNewElem->GetID();
                   }
                 }
               else {
-                
+
                 aNewElem = aNewEditor.AddElement(aNodesArray,
                                                  anElemType,
                                                  anElem->IsPoly());
@@ -2006,9 +2049,25 @@ SMESH_Gen_i::ConcatenateCommon(const SMESH::mesh_array& theMeshesArray,
                   else if( anElemType == SMDSAbs_Volume )
                     anIDsVolumes[anNbVolumes++] = aNewElem->GetID();
                 }
-              } 
+              }
             }//elems loop
-            
+
+            // copy orphan nodes
+            SMDS_NodeIteratorPtr  itNodes = anInitMeshDS->nodesIterator();
+            while ( itNodes->more() )
+            {
+              const SMDS_MeshNode* aNode = itNodes->next();
+              if ( aNode->NbInverseElements() == 0 )
+              {
+                const SMDS_MeshNode* aNewNode =
+                  aNewMeshDS->AddNode(aNode->X(), aNode->Y(), aNode->Z());
+                nodesMap.insert( make_pair(aNode->GetID(), aNewNode->GetID()) );
+                if( theCommonGroups )
+                  anIDsNodes[anNbNodes++] = aNewNode->GetID();
+              }
+            }
+
+
             aListOfGroups = anInitImpl->GetGroups();
             SMESH::SMESH_GroupBase_ptr aGroup;
 
@@ -2076,7 +2135,7 @@ SMESH_Gen_i::ConcatenateCommon(const SMESH::mesh_array& theMeshesArray,
                   default:
                     break;
                   }
-                
+
                   aListOfNewGroups.clear();
                   aListOfNewGroups.push_back(aNewGroup);
                   aGroupsMap.insert(make_pair( make_pair(aGroupName, aGroupType), aListOfNewGroups ));
@@ -2104,14 +2163,14 @@ SMESH_Gen_i::ConcatenateCommon(const SMESH::mesh_array& theMeshesArray,
                 for (int j = 0; j < anInitIDs->length(); j++) {
                   anNewIDs[j] = elemsMap.find(anInitIDs[j])->second;
                 }
-              
+
               // check that current group name and type don't have identical ones in union mesh
               if ( anIter == aGroupsMap.end() ) {
                 // add a new group in the mesh
                 aNewGroup = aNewImpl->CreateGroup(aGroupType, aGroupName);
                 // add elements into new group
                 aNewGroup->Add( anNewIDs );
-                
+
                 aListOfNewGroups.push_back(aNewGroup);
                 aGroupsMap.insert(make_pair( make_pair(aGroupName, aGroupType), aListOfNewGroups ));
               }
@@ -2126,7 +2185,7 @@ SMESH_Gen_i::ConcatenateCommon(const SMESH::mesh_array& theMeshesArray,
                 // rename identical groups
                 aNewGroup = aNewImpl->CreateGroup(aGroupType, aGroupName);
                 aNewGroup->Add( anNewIDs );
-                
+
                 TListOfNewGroups& aNewGroups = anIter->second;
                 string aNewGroupName;
                 if (aNewGroups.size() == 1) {
@@ -2146,7 +2205,7 @@ SMESH_Gen_i::ConcatenateCommon(const SMESH::mesh_array& theMeshesArray,
 
       if (theMergeNodesAndElements) {
         // merge nodes
-        set<const SMDS_MeshNode*> aMeshNodes; // no input nodes
+        TIDSortedNodeSet aMeshNodes; // no input nodes
         SMESH_MeshEditor::TListOfListOfNodes aGroupsOfNodes;
         aNewEditor.FindCoincidentNodes( aMeshNodes, theMergeTolerance, aGroupsOfNodes );
         aNewEditor.MergeNodes( aGroupsOfNodes );
@@ -2155,7 +2214,7 @@ SMESH_Gen_i::ConcatenateCommon(const SMESH::mesh_array& theMeshesArray,
       }
     }
   }
-  
+
   // Update Python script
   aPythonDump << aNewMesh << " = " << this;
   if( !theCommonGroups )
@@ -2189,10 +2248,217 @@ SMESH_Gen_i::ConcatenateCommon(const SMESH::mesh_array& theMeshesArray,
     SALOMEDS::AttributePixMap_var aPixmap = SALOMEDS::AttributePixMap::_narrow(anAttr);
     aPixmap->SetPixMap("ICON_SMESH_TREE_MESH");
   }
-
+  if (aNewMeshDS)
+    aNewMeshDS->Modified();
   return aNewMesh._retn();
 }
 
+//================================================================================
+/*!
+ * \brief Create a mesh by copying a part of another mesh
+ *  \param meshPart - a part of mesh to copy
+ *  \param toCopyGroups - to create in the new mesh groups
+ *                        the copied elements belongs to
+ *  \param toKeepIDs - to preserve IDs of the copied elements or not
+ *  \retval SMESH::SMESH_Mesh_ptr - the new mesh
+ */
+//================================================================================
+
+SMESH::SMESH_Mesh_ptr SMESH_Gen_i::CopyMesh(SMESH::SMESH_IDSource_ptr meshPart,
+                                            const char*               meshName,
+                                            CORBA::Boolean            toCopyGroups,
+                                            CORBA::Boolean            toKeepIDs)
+{
+  Unexpect aCatch(SALOME_SalomeException);
+
+  TPythonDump* pyDump = new TPythonDump; // prevent dump from CreateMesh()
+
+  // 1. Get source mesh
+
+  if ( CORBA::is_nil( meshPart ))
+    THROW_SALOME_CORBA_EXCEPTION( "bad IDSource", SALOME::BAD_PARAM );
+
+  SMESH::SMESH_Mesh_var srcMesh = meshPart->GetMesh();
+  SMESH_Mesh_i*       srcMesh_i = SMESH::DownCast<SMESH_Mesh_i*>( srcMesh );
+  if ( !srcMesh_i )
+    THROW_SALOME_CORBA_EXCEPTION( "bad mesh of IDSource", SALOME::BAD_PARAM );
+
+  SMESHDS_Mesh* srcMeshDS = srcMesh_i->GetImpl().GetMeshDS();
+
+  // 2. Make a new mesh
+
+  SMESH::SMESH_Mesh_var newMesh = CreateMesh(GEOM::GEOM_Object::_nil());
+  SMESH_Mesh_i*       newMesh_i = SMESH::DownCast<SMESH_Mesh_i*>( newMesh );
+  if ( !newMesh_i )
+    THROW_SALOME_CORBA_EXCEPTION( "can't create a mesh", SALOME::INTERNAL_ERROR );
+  SALOMEDS::SObject_var meshSO = ObjectToSObject(myCurrentStudy, newMesh );
+  if ( !meshSO->_is_nil() )
+  {
+    SetName( meshSO, meshName, "Mesh" );
+    SetPixMap( meshSO, "ICON_SMESH_TREE_MESH_IMPORTED");
+  }
+  SMESHDS_Mesh* newMeshDS = newMesh_i->GetImpl().GetMeshDS();
+  ::SMESH_MeshEditor editor( &newMesh_i->GetImpl() );
+
+  // 3. Get elements to copy
+
+  SMDS_ElemIteratorPtr srcElemIt;
+  TIDSortedElemSet srcElems;
+  SMESH::array_of_ElementType_var srcElemTypes = meshPart->GetTypes();
+  if ( SMESH::DownCast<SMESH_Mesh_i*>( meshPart ))
+  {
+    srcElemIt = srcMeshDS->elementsIterator();
+  }
+  else
+  {
+    SMESH::long_array_var ids = meshPart->GetIDs();
+    if ( srcElemTypes->length() == 1 && srcElemTypes[0] == SMESH::NODE ) // group of nodes
+    {
+      for (int i=0; i < ids->length(); i++)
+        if ( const SMDS_MeshElement * elem = srcMeshDS->FindNode( ids[i] ))
+          srcElems.insert( elem );
+    }
+    else
+    {
+      for (int i=0; i < ids->length(); i++)
+        if ( const SMDS_MeshElement * elem = srcMeshDS->FindElement( ids[i] ))
+          srcElems.insert( elem );
+    }
+    if ( srcElems.empty() )
+      return newMesh._retn();
+
+    typedef SMDS_SetIterator< SMDS_pElement, TIDSortedElemSet::const_iterator > ElIter;
+    srcElemIt = SMDS_ElemIteratorPtr( new ElIter( srcElems.begin(), srcElems.end() ));
+  }
+
+  // 4. Copy elements
+
+  typedef map<SMDS_pElement, SMDS_pElement, TIDCompare> TE2EMap;
+  TE2EMap e2eMapByType[ SMDSAbs_NbElementTypes ];
+  TE2EMap& n2nMap = e2eMapByType[ SMDSAbs_Node ];
+  int iN;
+  const SMDS_MeshNode *nSrc, *nTgt;
+  vector< const SMDS_MeshNode* > nodes;
+  while ( srcElemIt->more() )
+  {
+    const SMDS_MeshElement * elem = srcElemIt->next();
+    nodes.resize( elem->NbNodes());
+    SMDS_ElemIteratorPtr nIt = elem->nodesIterator();
+    if ( toKeepIDs ) {
+      for ( iN = 0; nIt->more(); ++iN )
+      {
+        nSrc = static_cast<const SMDS_MeshNode*>( nIt->next() );
+        nTgt = newMeshDS->FindNode( nSrc->GetID());
+        if ( !nTgt )
+          nTgt = newMeshDS->AddNodeWithID( nSrc->X(), nSrc->Y(), nSrc->Z(), nSrc->GetID());
+        nodes[ iN ] = nTgt;
+      }
+    }
+    else {
+      for ( iN = 0; nIt->more(); ++iN )
+      {
+        nSrc = static_cast<const SMDS_MeshNode*>( nIt->next() );
+        TE2EMap::iterator n2n = n2nMap.insert( make_pair( nSrc, SMDS_pNode(0) )).first;
+        if ( !n2n->second )
+          n2n->second = newMeshDS->AddNode( nSrc->X(), nSrc->Y(), nSrc->Z() );
+        nodes[ iN ] = (const SMDS_MeshNode*) n2n->second;
+      }
+    }
+    if ( elem->GetType() != SMDSAbs_Node )
+    {
+      int ID = toKeepIDs ? elem->GetID() : 0;
+      const SMDS_MeshElement * newElem = editor.AddElement( nodes,
+                                                            elem->GetType(),
+                                                            elem->IsPoly(),
+                                                            ID);
+      if ( toCopyGroups && !toKeepIDs )
+        e2eMapByType[ elem->GetType() ].insert( make_pair( elem, newElem ));
+    }
+  }
+
+  // 5. Copy groups
+
+  int nbNewGroups = 0;
+  if ( toCopyGroups )
+  {
+    SMESH_Mesh::GroupIteratorPtr gIt = srcMesh_i->GetImpl().GetGroups();
+    while ( gIt->more() )
+    {
+      SMESH_Group* group = gIt->next();
+      const SMESHDS_GroupBase* groupDS = group->GetGroupDS();
+
+      // Check group type. We copy nodal groups containing nodes of copied element
+      SMDSAbs_ElementType groupType = groupDS->GetType();
+      if ( groupType != SMDSAbs_Node &&
+           newMeshDS->GetMeshInfo().NbElements( groupType ) == 0 )
+        continue; // group type differs from types of meshPart
+
+      // Find copied elements in the group
+      vector< const SMDS_MeshElement* > groupElems;
+      SMDS_ElemIteratorPtr eIt = groupDS->GetElements();
+      if ( toKeepIDs )
+      {
+        const SMDS_MeshElement* foundElem;
+        if ( groupType == SMDSAbs_Node )
+        {
+          while ( eIt->more() )
+            if (( foundElem = newMeshDS->FindNode( eIt->next()->GetID() )))
+              groupElems.push_back( foundElem );
+        }
+        else
+        {
+          while ( eIt->more() )
+            if (( foundElem = newMeshDS->FindElement( eIt->next()->GetID() )))
+              groupElems.push_back( foundElem );
+        }
+      }
+      else
+      {
+        TE2EMap & e2eMap = e2eMapByType[ groupDS->GetType() ];
+        if ( e2eMap.empty() ) continue;
+        int minID = e2eMap.begin()->first->GetID();
+        int maxID = e2eMap.rbegin()->first->GetID();
+        TE2EMap::iterator e2e;
+        while ( eIt->more() && groupElems.size() < e2eMap.size())
+        {
+          const SMDS_MeshElement* e = eIt->next();
+          if ( e->GetID() < minID || e->GetID() > maxID ) continue;
+          if ((e2e = e2eMap.find( e )) != e2eMap.end())
+            groupElems.push_back( e2e->second );
+        }
+      }
+      // Make a new group
+      if ( !groupElems.empty() )
+      {
+        SMESH::SMESH_Group_var newGroupObj =
+          newMesh->CreateGroup( SMESH::ElementType(groupType), group->GetName() );
+        if ( SMESH_GroupBase_i* newGroup_i = SMESH::DownCast<SMESH_GroupBase_i*>( newGroupObj))
+        {
+          SMESHDS_GroupBase * newGroupDS = newGroup_i->GetGroupDS();
+          SMDS_MeshGroup& smdsGroup = ((SMESHDS_Group*)newGroupDS)->SMDSGroup();
+          for ( unsigned i = 0; i < groupElems.size(); ++i )
+            smdsGroup.Add( groupElems[i] );
+
+          nbNewGroups++;
+        }
+      }
+    }
+  }
+
+  *pyDump << newMesh << " = " << this
+          << ".CopyMesh( " << meshPart << ", "
+          << "'" << meshName << "', "
+          << toCopyGroups << ", "
+          << toKeepIDs << ")";
+
+  delete pyDump; pyDump = 0; // allow dump in GetGroups()
+
+  if ( nbNewGroups > 0 ) // dump created groups
+    SMESH::ListOfGroups_var groups = newMesh->GetGroups();
+
+  return newMesh._retn();
+}
+
 //================================================================================
 /*!
  *  SMESH_Gen_i::GetMEDVersion
@@ -2252,7 +2518,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
   //  ASSERT( theComponent->GetStudy()->StudyId() == myCurrentStudy->StudyId() )
   // san -- in case <myCurrentStudy> differs from theComponent's study,
   // use that of the component
-  if ( myCurrentStudy->_is_nil() || 
+  if ( myCurrentStudy->_is_nil() ||
     theComponent->GetStudy()->StudyId() != myCurrentStudy->StudyId() )
     SetCurrentStudy( theComponent->GetStudy() );
 
@@ -2273,7 +2539,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
   aFileSeq->length( NUM_TMP_FILES );
 
   TCollection_AsciiString aStudyName( "" );
-  if ( isMultiFile ) 
+  if ( isMultiFile )
     aStudyName = ( (char*)SALOMEDS_Tool::GetNameFromPath( myCurrentStudy->URL() ).c_str() );
 
   // Set names of temporary files
@@ -2312,6 +2578,38 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
   DriverMED_W_SMESHDS_Mesh myWriter;
   myWriter.SetFile( meshfile.ToCString() );
 
+  // IMP issue 20918
+  // SetStoreName() to groups before storing hypotheses to let them refer to
+  // groups using "store name", which is "Group <group_persistent_id>"
+  {
+    SALOMEDS::ChildIterator_var itBig = myCurrentStudy->NewChildIterator( theComponent );
+    for ( ; itBig->More(); itBig->Next() ) {
+      SALOMEDS::SObject_var gotBranch = itBig->Value();
+      if ( gotBranch->Tag() > GetAlgorithmsRootTag() ) {
+        CORBA::Object_var anObject = SObjectToObject( gotBranch );
+        if ( !CORBA::is_nil( anObject ) ) {
+          SMESH::SMESH_Mesh_var myMesh = SMESH::SMESH_Mesh::_narrow( anObject ) ;
+          if ( !myMesh->_is_nil() ) {
+            SMESH::ListOfGroups_var groups = myMesh->GetGroups();
+            for ( int i = 0; i < groups->length(); ++i )
+            {
+              SMESH_GroupBase_i* grImpl = SMESH::DownCast<SMESH_GroupBase_i*>( groups[i]);
+              if ( grImpl )
+              {
+                CORBA::String_var objStr = GetORB()->object_to_string( grImpl->_this() );
+                int anId = myStudyContext->findId( string( objStr.in() ) );
+                char grpName[ 30 ];
+                sprintf( grpName, "Group %d", anId );
+                SMESHDS_GroupBase* aGrpBaseDS = grImpl->GetGroupDS();
+                aGrpBaseDS->SetStoreName( grpName );
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+
   // Write data
   // ---> create HDF file
   aFile = new HDFfile( (char*) filename.ToCString() );
@@ -2507,6 +2805,22 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
             aDataset->WriteOnDisk( anAutoColor );
             aDataset->CloseOnDisk();
 
+            // issue 0020693. Store _isModified flag
+            int isModified = myLocMesh.GetIsModified();
+            aSize[ 0 ] = 1;
+            aDataset = new HDFdataset( "_isModified", aTopGroup, HDF_INT32, aSize, 1 );
+            aDataset->CreateOnDisk();
+            aDataset->WriteOnDisk( &isModified );
+            aDataset->CloseOnDisk();
+
+            // issue 20918. Store Persistent Id of SMESHDS_Mesh
+            int meshPersistentId = mySMESHDSMesh->GetPersistentId();
+            aSize[ 0 ] = 1;
+            aDataset = new HDFdataset( "meshPersistentId", aTopGroup, HDF_INT32, aSize, 1 );
+            aDataset->CreateOnDisk();
+            aDataset->WriteOnDisk( &meshPersistentId );
+            aDataset->CloseOnDisk();
+
             // write reference on a shape if exists
             SALOMEDS::SObject_var myRef;
             bool shapeRefFound = false;
@@ -2546,7 +2860,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                 if ( ok ) {
                   // san - it is impossible to recover applied hypotheses
                   //       using their entries within Load() method,
-                  // for there are no AttributeIORs in the study when Load() is working. 
+                  // for there are no AttributeIORs in the study when Load() is working.
                   // Hence, it is better to store persistent IDs of hypotheses as references to them
 
                   //string myRefOnObject = myRefOnHyp->GetID();
@@ -2589,7 +2903,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                 if ( ok ) {
                   // san - it is impossible to recover applied algorithms
                   //       using their entries within Load() method,
-                  // for there are no AttributeIORs in the study when Load() is working. 
+                  // for there are no AttributeIORs in the study when Load() is working.
                   // Hence, it is better to store persistent IDs of algorithms as references to them
 
                   //string myRefOnObject = myRefOnAlgo->GetID();
@@ -2850,17 +3164,19 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                       dynamic_cast<SMESH_GroupBase_i*>( GetServant( aSubObject ).in() );
                     if ( !myGroupImpl )
                       continue;
-                    
+                    SMESHDS_GroupBase* aGrpBaseDS = myGroupImpl->GetGroupDS();
+                    if ( !aGrpBaseDS )
+                      continue;
+
                     CORBA::String_var objStr = GetORB()->object_to_string( aSubObject );
                     int anId = myStudyContext->findId( string( objStr.in() ) );
-                    
+
                     // For each group, create a dataset named "Group <group_persistent_id>"
                     // and store the group's user name into it
-                    char grpName[ 30 ];
-                    sprintf( grpName, "Group %d", anId );
+                    const char* grpName = aGrpBaseDS->GetStoreName();
                     char* aUserName = myGroupImpl->GetName();
                     aSize[ 0 ] = strlen( aUserName ) + 1;
-                    
+
                     aDataset = new HDFdataset( grpName, aGroup, HDF_STRING, aSize, 1 );
                     aDataset->CreateOnDisk();
                     aDataset->WriteOnDisk( aUserName );
@@ -2882,74 +3198,64 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                     aDataset->WriteOnDisk( anRGB );
                     aDataset->CloseOnDisk();
 
-                    // Store the group contents into MED file
-                    if ( myLocMesh.GetGroup( myGroupImpl->GetLocalID() ) ) {
-                      
-                      if(MYDEBUG) MESSAGE( "VSR - SMESH_Gen_i::Save(): saving group with StoreName = "
-                                          << grpName << " to MED file" );
-                      SMESHDS_GroupBase* aGrpBaseDS =
-                        myLocMesh.GetGroup( myGroupImpl->GetLocalID() )->GetGroupDS();
-                      aGrpBaseDS->SetStoreName( grpName );
-
-                      // Pass SMESHDS_Group to MED writer 
-                      SMESHDS_Group* aGrpDS = dynamic_cast<SMESHDS_Group*>( aGrpBaseDS );
-                      if ( aGrpDS )
-                        myWriter.AddGroup( aGrpDS );
-                      
-                      // write reference on a shape if exists
-                      SMESHDS_GroupOnGeom* aGeomGrp =
-                        dynamic_cast<SMESHDS_GroupOnGeom*>( aGrpBaseDS );
-                      if ( aGeomGrp ) {
-                        SALOMEDS::SObject_var mySubRef, myShape;
-                        if (mySObject->FindSubObject( GetRefOnShapeTag(), mySubRef ) &&
-                            mySubRef->ReferencedObject( myShape ) &&
-                            !CORBA::is_nil( myShape->GetObject() ))
-                        {
-                          string myRefOnObject = myShape->GetID();
-                          if ( myRefOnObject.length() > 0 ) {
-                            char aRefName[ 30 ];
-                            sprintf( aRefName, "Ref on shape %d", anId);
-                            aSize[ 0 ] = myRefOnObject.length() + 1;
-                            aDataset = new HDFdataset(aRefName, aGroup, HDF_STRING, aSize, 1);
-                            aDataset->CreateOnDisk();
-                            aDataset->WriteOnDisk( ( char* )( myRefOnObject.c_str() ) );
-                            aDataset->CloseOnDisk();
-                          }
-                        }
-                        else // shape ref is invalid:
-                        {
-                          // save a group on geometry as ordinary group
-                          myWriter.AddGroup( aGeomGrp );
+                    // Pass SMESHDS_Group to MED writer
+                    SMESHDS_Group* aGrpDS = dynamic_cast<SMESHDS_Group*>( aGrpBaseDS );
+                    if ( aGrpDS )
+                      myWriter.AddGroup( aGrpDS );
+
+                    // write reference on a shape if exists
+                    SMESHDS_GroupOnGeom* aGeomGrp =
+                      dynamic_cast<SMESHDS_GroupOnGeom*>( aGrpBaseDS );
+                    if ( aGeomGrp ) {
+                      SALOMEDS::SObject_var mySubRef, myShape;
+                      if (mySObject->FindSubObject( GetRefOnShapeTag(), mySubRef ) &&
+                          mySubRef->ReferencedObject( myShape ) &&
+                          !CORBA::is_nil( myShape->GetObject() ))
+                      {
+                        string myRefOnObject = myShape->GetID();
+                        if ( myRefOnObject.length() > 0 ) {
+                          char aRefName[ 30 ];
+                          sprintf( aRefName, "Ref on shape %d", anId);
+                          aSize[ 0 ] = myRefOnObject.length() + 1;
+                          aDataset = new HDFdataset(aRefName, aGroup, HDF_STRING, aSize, 1);
+                          aDataset->CreateOnDisk();
+                          aDataset->WriteOnDisk( ( char* )( myRefOnObject.c_str() ) );
+                          aDataset->CloseOnDisk();
                         }
                       }
+                      else // shape ref is invalid:
+                      {
+                        // save a group on geometry as ordinary group
+                        myWriter.AddGroup( aGeomGrp );
+                      }
                     }
                   }
                 }
                 aGroup->CloseOnDisk();
               }
-            } // loop on groups 
-            
+            } // loop on groups
+
             if ( strcmp( strHasData.c_str(), "1" ) == 0 )
             {
               // Flush current mesh information into MED file
               myWriter.Perform();
-              
+
               // maybe a shape was deleted in the study
               if ( !shapeRefFound && !mySMESHDSMesh->ShapeToMesh().IsNull() && hasShape) {
                 TopoDS_Shape nullShape;
                 myLocMesh.ShapeToMesh( nullShape ); // remove shape referring data
               }
-              
+
               if ( !mySMESHDSMesh->SubMeshes().empty() )
               {
                 // Store submeshes
                 // ----------------
                 aGroup = new HDFgroup( "Submeshes", aTopGroup );
                 aGroup->CreateOnDisk();
-                
+
                 // each element belongs to one or none submesh,
                 // so for each node/element, we store a submesh ID
-                
+
                 // Make maps of submesh IDs of elements sorted by element IDs
                 typedef int TElemID;
                 typedef int TSubMID;
@@ -2974,7 +3280,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                   for ( itElem = aSubMesh->GetElements(); itElem->more(); ++hint)
                     hint = eId2smId.insert( hint, make_pair( itElem->next()->GetID(), aSubMeID ));
                 }
-                
+
                 // Care of elements that are not on submeshes
                 if ( mySMESHDSMesh->NbNodes() != nId2smId.size() ) {
                   for ( itNode = mySMESHDSMesh->nodesIterator(); itNode->more(); )
@@ -2988,7 +3294,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                   for ( itElem = mySMESHDSMesh->elementsIterator(); itElem->more(); )
                     eId2smId.insert( make_pair( itElem->next()->GetID(), 0 ));
                 }
-                
+
                 // Store submesh IDs
                 for ( int isNode = 0; isNode < 2; ++isNode )
                 {
@@ -3009,20 +3315,20 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                   //
                   delete[] smIDs;
                 }
-                
+
                 // Store node positions on sub-shapes (SMDS_Position):
                 // ----------------------------------------------------
-                
+
                 aGroup = new HDFgroup( "Node Positions", aTopGroup );
                 aGroup->CreateOnDisk();
-                
+
                 // in aGroup, create 5 datasets to contain:
                 // "Nodes on Edges" - ID of node on edge
                 // "Edge positions" - U parameter on node on edge
                 // "Nodes on Faces" - ID of node on face
                 // "Face U positions" - U parameter of node on face
                 // "Face V positions" - V parameter of node on face
-                
+
                 // Find out nb of nodes on edges and faces
                 // Collect corresponing sub-meshes
                 int nbEdgeNodes = 0, nbFaceNodes = 0;
@@ -3035,8 +3341,10 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                     continue; // submesh containing other submeshs
                   int nbNodes = aSubMesh->NbNodes();
                   if ( nbNodes == 0 ) continue;
-                  
+
                   int aShapeID = (*itSubM).first;
+                  if ( aShapeID < 1 || aShapeID > mySMESHDSMesh->MaxShapeIndex() )
+                    continue;
                   int aShapeType = mySMESHDSMesh->IndexToShape( aShapeID ).ShapeType();
                   // write only SMDS_FacePosition and SMDS_EdgePosition
                   switch ( aShapeType ) {
@@ -3061,7 +3369,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                   int* aNodeIDs = new int [ nbNodes ];
                   double* aUPos = new double [ nbNodes ];
                   double* aVPos = ( onFace ? new double[ nbNodes ] : 0 );
-                  
+
                   // Fill arrays
                   // loop on sub-meshes
                   list<SMESHDS_SubMesh*> * pListSM = ( onFace ? &aFaceSM : &aEdgeSM );
@@ -3069,7 +3377,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                   for ( ; itSM != pListSM->end(); itSM++ )
                   {
                     SMESHDS_SubMesh* aSubMesh = (*itSM);
-                    
+
                     SMDS_NodeIteratorPtr itNode = aSubMesh->GetNodes();
                     // loop on nodes in aSubMesh
                     while ( itNode->more() )
@@ -3077,12 +3385,12 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                       //node ID
                       const SMDS_MeshNode* node = itNode->next();
                       aNodeIDs [ iNode ] = node->GetID();
-                      
+
                       // Position
                       const SMDS_PositionPtr pos = node->GetPosition();
                       if ( onFace ) { // on FACE
                         const SMDS_FacePosition* fPos =
-                          dynamic_cast<const SMDS_FacePosition*>( pos.get() );
+                          dynamic_cast<const SMDS_FacePosition*>( pos );
                         if ( fPos ) {
                           aUPos[ iNode ] = fPos->GetUParameter();
                           aVPos[ iNode ] = fPos->GetVParameter();
@@ -3093,7 +3401,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                       }
                       else { // on EDGE
                         const SMDS_EdgePosition* ePos =
-                          dynamic_cast<const SMDS_EdgePosition*>( pos.get() );
+                          dynamic_cast<const SMDS_EdgePosition*>( pos );
                         if ( ePos ) {
                           aUPos[ iNode ] = ePos->GetUParameter();
                           iNode++;
@@ -3103,7 +3411,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                       }
                     } // loop on nodes in aSubMesh
                   } // loop on sub-meshes
-                  
+
                   // Write datasets
                   if ( nbNodes )
                   {
@@ -3114,7 +3422,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                     aDataset->CreateOnDisk();
                     aDataset->WriteOnDisk( aNodeIDs );
                     aDataset->CloseOnDisk();
-                
+
                     // U Positions
                     aDSName = ( onFace ? "Face U positions" : "Edge positions");
                     aDataset = new HDFdataset( (char*)aDSName.c_str(), aGroup, HDF_FLOAT64, aSize, 1);
@@ -3132,15 +3440,15 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
                   delete [] aNodeIDs;
                   delete [] aUPos;
                   if ( aVPos ) delete [] aVPos;
-                  
+
                 } // treat positions on edges or faces
-                
+
                 // close "Node Positions" group
-                aGroup->CloseOnDisk(); 
-                
+                aGroup->CloseOnDisk();
+
               } // if ( there are submeshes in SMESHDS_Mesh )
             } // if ( hasData )
-            
+
             // close mesh HDF group
             aTopGroup->CloseOnDisk();
           }
@@ -3148,7 +3456,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
       }
     }
   }
-  
+
   // close HDF file
   aFile->CloseOnDisk();
   delete aFile;
@@ -3157,7 +3465,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::Save( SALOMEDS::SComponent_ptr theComponent,
   aStreamFile = SALOMEDS_Tool::PutFilesToStream( tmpDir.ToCString(), aFileSeq.in(), isMultiFile );
 
   // Remove temporary files and directory
-  if ( !isMultiFile ) 
+  if ( !isMultiFile )
     SALOMEDS_Tool::RemoveTemporaryFiles( tmpDir.ToCString(), aFileSeq.in(), true );
 
   INFOS( "SMESH_Gen_i::Save() completed" );
@@ -3189,7 +3497,7 @@ SALOMEDS::TMPFile* SMESH_Gen_i::SaveASCII( SALOMEDS::SComponent_ptr theComponent
   buffer[size * 3] = '\0';
 
   SALOMEDS::TMPFile_var anAsciiStreamFile = new SALOMEDS::TMPFile(size*3, size*3, buffer, 1);
-  
+
   return anAsciiStreamFile._retn();
 }
 
@@ -3210,7 +3518,7 @@ void SMESH_Gen_i::loadGeomData( SALOMEDS::SComponent_ptr theCompRoot )
   if ( aStudy->_is_nil() )
     return;
 
-  SALOMEDS::StudyBuilder_var aStudyBuilder = aStudy->NewBuilder(); 
+  SALOMEDS::StudyBuilder_var aStudyBuilder = aStudy->NewBuilder();
   aStudyBuilder->LoadWith( theCompRoot, GetGeomEngine() );
 }
 //=============================================================================
@@ -3226,13 +3534,15 @@ public:
   }
   PositionCreator() {
     myFuncTable.resize( (size_t) TopAbs_SHAPE, & PositionCreator::defaultPosition );
-    myFuncTable[ TopAbs_FACE ] = & PositionCreator::facePosition;
-    myFuncTable[ TopAbs_EDGE ] = & PositionCreator::edgePosition;
+    myFuncTable[ TopAbs_SOLID  ] = & PositionCreator::volumePosition;
+    myFuncTable[ TopAbs_FACE   ] = & PositionCreator::facePosition;
+    myFuncTable[ TopAbs_EDGE   ] = & PositionCreator::edgePosition;
     myFuncTable[ TopAbs_VERTEX ] = & PositionCreator::vertexPosition;
   }
 private:
   SMDS_PositionPtr edgePosition()    const { return SMDS_PositionPtr( new SMDS_EdgePosition  ); }
   SMDS_PositionPtr facePosition()    const { return SMDS_PositionPtr( new SMDS_FacePosition  ); }
+  SMDS_PositionPtr volumePosition()  const { return SMDS_PositionPtr( new SMDS_SpacePosition ); }
   SMDS_PositionPtr vertexPosition()  const { return SMDS_PositionPtr( new SMDS_VertexPosition); }
   SMDS_PositionPtr defaultPosition() const { return SMDS_SpacePosition::originSpacePosition();  }
   typedef SMDS_PositionPtr (PositionCreator:: * FmakePos)() const;
@@ -3254,7 +3564,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
 {
   INFOS( "SMESH_Gen_i::Load" );
 
-  if ( myCurrentStudy->_is_nil() || 
+  if ( myCurrentStudy->_is_nil() ||
        theComponent->GetStudy()->StudyId() != myCurrentStudy->StudyId() )
     SetCurrentStudy( theComponent->GetStudy() );
 
@@ -3270,7 +3580,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
   // Get temporary files location
   TCollection_AsciiString tmpDir =
     isMultiFile ? TCollection_AsciiString( ( char* )theURL ) : ( char* )SALOMEDS_Tool::GetTmpDir().c_str();
-    
+
     INFOS( "THE URL++++++++++++++" )
     INFOS( theURL );
     INFOS( "THE TMP PATH+++++++++" );
@@ -3281,7 +3591,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
                                                                             tmpDir.ToCString(),
                                                                             isMultiFile );
   TCollection_AsciiString aStudyName( "" );
-  if ( isMultiFile ) 
+  if ( isMultiFile )
     aStudyName = ( (char*)SALOMEDS_Tool::GetNameFromPath( myCurrentStudy->URL() ).c_str() );
 
   // Set names of temporary files
@@ -3324,16 +3634,16 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
   list< pair< SMESH_Mesh_i*,       HDFgroup* > > meshGroupList;
 
   // get total number of top-level groups
-  int aNbGroups = aFile->nInternalObjects(); 
+  int aNbGroups = aFile->nInternalObjects();
   if ( aNbGroups > 0 ) {
     // --> in first turn we should read&create hypotheses
     if ( aFile->ExistInternalObject( "Hypotheses" ) ) {
       // open hypotheses root HDF group
-      aTopGroup = new HDFgroup( "Hypotheses", aFile ); 
+      aTopGroup = new HDFgroup( "Hypotheses", aFile );
       aTopGroup->OpenOnDisk();
 
       // get number of hypotheses
-      int aNbObjects = aTopGroup->nInternalObjects(); 
+      int aNbObjects = aTopGroup->nInternalObjects();
       for ( int j = 0; j < aNbObjects; j++ ) {
         // try to identify hypothesis
         char hypGrpName[ HDF_NAME_MAX_LEN+1 ];
@@ -3341,7 +3651,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
 
         if ( string( hypGrpName ).substr( 0, 10 ) == string( "Hypothesis" ) ) {
           // open hypothesis group
-          aGroup = new HDFgroup( hypGrpName, aTopGroup ); 
+          aGroup = new HDFgroup( hypGrpName, aTopGroup );
           aGroup->OpenOnDisk();
 
           // --> get hypothesis id
@@ -3428,11 +3738,11 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
     // --> then we should read&create algorithms
     if ( aFile->ExistInternalObject( "Algorithms" ) ) {
       // open algorithms root HDF group
-      aTopGroup = new HDFgroup( "Algorithms", aFile ); 
+      aTopGroup = new HDFgroup( "Algorithms", aFile );
       aTopGroup->OpenOnDisk();
 
       // get number of algorithms
-      int aNbObjects = aTopGroup->nInternalObjects(); 
+      int aNbObjects = aTopGroup->nInternalObjects();
       for ( int j = 0; j < aNbObjects; j++ ) {
         // try to identify algorithm
         char hypGrpName[ HDF_NAME_MAX_LEN+1 ];
@@ -3440,7 +3750,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
 
         if ( string( hypGrpName ).substr( 0, 9 ) == string( "Algorithm" ) ) {
           // open algorithm group
-          aGroup = new HDFgroup( hypGrpName, aTopGroup ); 
+          aGroup = new HDFgroup( hypGrpName, aTopGroup );
           aGroup->OpenOnDisk();
 
           // --> get algorithm id
@@ -3538,11 +3848,11 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
           continue;
 
         // open mesh HDF group
-        aTopGroup = new HDFgroup( meshName, aFile ); 
+        aTopGroup = new HDFgroup( meshName, aFile );
         aTopGroup->OpenOnDisk();
 
         // get number of child HDF objects
-        int aNbObjects = aTopGroup->nInternalObjects(); 
+        int aNbObjects = aTopGroup->nInternalObjects();
         if ( aNbObjects > 0 ) {
           // create mesh
           if(MYDEBUG) MESSAGE( "VSR - load mesh : id = " << id );
@@ -3595,6 +3905,30 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
               }
             }
           }
+
+          // issue 0020693. Restore _isModified flag
+          if( aTopGroup->ExistInternalObject( "_isModified" ) )
+          {
+            aDataset = new HDFdataset( "_isModified", aTopGroup );
+            aDataset->OpenOnDisk();
+            size = aDataset->GetSize();
+            int* isModified = new int[ size ];
+            aDataset->ReadFromDisk( isModified );
+            aDataset->CloseOnDisk();
+            myNewMeshImpl->GetImpl().SetIsModified( bool(*isModified));
+          }
+
+          // issue 20918. Restore Persistent Id of SMESHDS_Mesh
+          if( aTopGroup->ExistInternalObject( "meshPersistentId" ) )
+          {
+            aDataset = new HDFdataset( "meshPersistentId", aTopGroup );
+            aDataset->OpenOnDisk();
+            size = aDataset->GetSize();
+            int* meshPersistentId = new int[ size ];
+            aDataset->ReadFromDisk( meshPersistentId );
+            aDataset->CloseOnDisk();
+            myNewMeshImpl->GetImpl().GetMeshDS()->SetPersistentId( *meshPersistentId );
+          }
         }
       }
     }
@@ -3651,7 +3985,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
         aGroup = new HDFgroup( "Applied Algorithms", aTopGroup );
         aGroup->OpenOnDisk();
         // get number of applied algorithms
-        int aNbSubObjects = aGroup->nInternalObjects(); 
+        int aNbSubObjects = aGroup->nInternalObjects();
         if(MYDEBUG) MESSAGE( "VSR - number of applied algos " << aNbSubObjects );
         for ( int j = 0; j < aNbSubObjects; j++ ) {
           char name_dataset[ HDF_NAME_MAX_LEN+1 ];
@@ -3690,7 +4024,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
         aGroup = new HDFgroup( "Applied Hypotheses", aTopGroup );
         aGroup->OpenOnDisk();
         // get number of applied hypotheses
-        int aNbSubObjects = aGroup->nInternalObjects(); 
+        int aNbSubObjects = aGroup->nInternalObjects();
         for ( int j = 0; j < aNbSubObjects; j++ ) {
           char name_dataset[ HDF_NAME_MAX_LEN+1 ];
           aGroup->InternalObjectIndentify( j, name_dataset );
@@ -3748,7 +4082,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
           aGroup->OpenOnDisk();
 
           // get number of submeshes
-          int aNbSubMeshes = aGroup->nInternalObjects(); 
+          int aNbSubMeshes = aGroup->nInternalObjects();
           for ( int k = 0; k < aNbSubMeshes; k++ ) {
             // identify submesh
             char name_submeshgroup[ HDF_NAME_MAX_LEN+1 ];
@@ -3815,7 +4149,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
                 aSubSubGroup = new HDFgroup( "Applied Algorithms", aSubGroup );
                 aSubSubGroup->OpenOnDisk();
                 // get number of applied algorithms
-                int aNbSubObjects = aSubSubGroup->nInternalObjects(); 
+                int aNbSubObjects = aSubSubGroup->nInternalObjects();
                 for ( int l = 0; l < aNbSubObjects; l++ ) {
                   char name_dataset[ HDF_NAME_MAX_LEN+1 ];
                   aSubSubGroup->InternalObjectIndentify( l, name_dataset );
@@ -3852,7 +4186,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
                 aSubSubGroup = new HDFgroup( "Applied Hypotheses", aSubGroup );
                 aSubSubGroup->OpenOnDisk();
                 // get number of applied hypotheses
-                int aNbSubObjects = aSubSubGroup->nInternalObjects(); 
+                int aNbSubObjects = aSubSubGroup->nInternalObjects();
                 for ( int l = 0; l < aNbSubObjects; l++ ) {
                   char name_dataset[ HDF_NAME_MAX_LEN+1 ];
                   aSubSubGroup->InternalObjectIndentify( l, name_dataset );
@@ -3906,12 +4240,12 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
         else
         {
           // open a group
-          aGroup = new HDFgroup( "Submeshes", aTopGroup ); 
+          aGroup = new HDFgroup( "Submeshes", aTopGroup );
           aGroup->OpenOnDisk();
 
-          int maxID = mySMESHDSMesh->MaxShapeIndex();
+          int maxID = Max( mySMESHDSMesh->MaxSubMeshIndex(), mySMESHDSMesh->MaxShapeIndex() );
           vector< SMESHDS_SubMesh * > subMeshes( maxID + 1, (SMESHDS_SubMesh*) 0 );
-          vector< TopAbs_ShapeEnum  > smType   ( maxID + 1, TopAbs_SHAPE ); 
+          vector< TopAbs_ShapeEnum  > smType   ( maxID + 1, TopAbs_SHAPE );
 
           PositionCreator aPositionCreator;
 
@@ -3967,7 +4301,6 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
                 // add
                 if ( isNode ) {
                   SMDS_PositionPtr pos = aPositionCreator.MakePosition( smType[ smID ]);
-                  pos->SetShapeId( smID );
                   SMDS_MeshNode* node = const_cast<SMDS_MeshNode*>( static_cast<const SMDS_MeshNode*>( elem ));
                   node->SetPosition( pos );
                   sm->AddNode( node );
@@ -4002,7 +4335,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
           double *aEpos = 0, *aFupos = 0, *aFvpos = 0;
 
           // open a group
-          aGroup = new HDFgroup( "Node Positions", aTopGroup ); 
+          aGroup = new HDFgroup( "Node Positions", aTopGroup );
           aGroup->OpenOnDisk();
 
           // loop on 5 data sets
@@ -4071,7 +4404,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
                 // not fixed bugs in SMDS_MeshInfo
                 if ( aPos->GetTypeOfPosition() == SMDS_TOP_FACE ) {
                   SMDS_FacePosition* fPos = const_cast<SMDS_FacePosition*>
-                    ( static_cast<const SMDS_FacePosition*>( aPos.get() ));
+                    ( static_cast<const SMDS_FacePosition*>( aPos ));
                   fPos->SetUParameter( aUPos[ iNode ]);
                   fPos->SetVParameter( aVPos[ iNode ]);
                 }
@@ -4080,7 +4413,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
                 // ASSERT( aPos->GetTypeOfPosition() == SMDS_TOP_EDGE );-- issue 20182
                 if ( aPos->GetTypeOfPosition() == SMDS_TOP_EDGE ) {
                   SMDS_EdgePosition* fPos = const_cast<SMDS_EdgePosition*>
-                    ( static_cast<const SMDS_EdgePosition*>( aPos.get() ));
+                    ( static_cast<const SMDS_EdgePosition*>( aPos ));
                   fPos->SetUParameter( aUPos[ iNode ]);
                 }
               }
@@ -4097,20 +4430,6 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
         } // if ( aTopGroup->ExistInternalObject( "Node Positions" ) )
       } // if ( hasData )
 
-      // Recompute State (as computed sub-meshes are restored from MED)
-      if ( !aShapeObject->_is_nil() || !myNewMeshImpl->HasShapeToMesh()) {
-        MESSAGE("Compute State Engine ...");
-        TopoDS_Shape myLocShape;
-        if(myNewMeshImpl->HasShapeToMesh())
-          myLocShape = GeomObjectToShape( aShapeObject );
-        else
-          myLocShape = SMESH_Mesh::PseudoShape();
-        
-        myNewMeshImpl->GetImpl().GetSubMesh(myLocShape)->ComputeStateEngine
-          (SMESH_subMesh::SUBMESH_RESTORED);
-        MESSAGE("Compute State Engine finished");
-      }
-
       // try to get groups
       for ( int ii = GetNodeGroupsTag(); ii <= GetVolumeGroupsTag(); ii++ ) {
         char name_group[ 30 ];
@@ -4127,7 +4446,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
           aGroup = new HDFgroup( name_group, aTopGroup );
           aGroup->OpenOnDisk();
           // get number of groups
-          int aNbSubObjects = aGroup->nInternalObjects(); 
+          int aNbSubObjects = aGroup->nInternalObjects();
           for ( int j = 0; j < aNbSubObjects; j++ ) {
             char name_dataset[ HDF_NAME_MAX_LEN+1 ];
             aGroup->InternalObjectIndentify( j, name_dataset );
@@ -4172,7 +4491,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
               SMESH::ElementType type = (SMESH::ElementType)(ii - GetNodeGroupsTag() + 1);
               SMESH::SMESH_GroupBase_var aNewGroup = SMESH::SMESH_GroupBase::_duplicate
                 ( myNewMeshImpl->createGroup( type, nameFromFile, aShape ) );
-              // Obtain a SMESHDS_Group object 
+              // Obtain a SMESHDS_Group object
               if ( aNewGroup->_is_nil() )
                 continue;
 
@@ -4217,6 +4536,7 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
           aGroup->CloseOnDisk();
         }
       }
+
       // read submeh order if any
       if( aTopGroup->ExistInternalObject( "Mesh Order" ) ) {
         aDataset = new HDFdataset( "Mesh Order", aTopGroup );
@@ -4232,20 +4552,43 @@ bool SMESH_Gen_i::Load( SALOMEDS::SComponent_ptr theComponent,
             anOrderIds.push_back( TListOfInt() );
           else
             anOrderIds.back().push_back(smIDs[ i ]);
-        
+
         myNewMeshImpl->GetImpl().SetMeshOrder( anOrderIds );
       }
+    } // loop on meshes
+
+    // notify algos on completed restoration
+    for ( meshi_group = meshGroupList.begin(); meshi_group != meshGroupList.end(); ++meshi_group )
+    {
+      SMESH_Mesh_i* myNewMeshImpl = meshi_group->first;
+      ::SMESH_Mesh& myLocMesh     = myNewMeshImpl->GetImpl();
+
+      TopoDS_Shape myLocShape;
+      if(myLocMesh.HasShapeToMesh())
+        myLocShape = myLocMesh.GetShapeToMesh();
+      else
+        myLocShape = SMESH_Mesh::PseudoShape();
+
+      myLocMesh.GetSubMesh(myLocShape)->
+        ComputeStateEngine (SMESH_subMesh::SUBMESH_RESTORED);
+    }
+
+    for ( hyp_data = hypDataList.begin(); hyp_data != hypDataList.end(); ++hyp_data )
+    {
+      SMESH_Hypothesis_i* hyp  = hyp_data->first;
+      hyp->UpdateAsMeshesRestored(); // for hyps needing full mesh data restored (issue 20918)
     }
+
     // close mesh group
     if(aTopGroup)
-      aTopGroup->CloseOnDisk();   
+      aTopGroup->CloseOnDisk();
   }
   // close HDF file
   aFile->CloseOnDisk();
   delete aFile;
 
   // Remove temporary files created from the stream
-  if ( !isMultiFile ) 
+  if ( !isMultiFile )
     SALOMEDS_Tool::RemoveTemporaryFiles( tmpDir.ToCString(), aFileSeq.in(), true );
 
   INFOS( "SMESH_Gen_i::Load completed" );
@@ -4287,7 +4630,7 @@ bool SMESH_Gen_i::LoadASCII( SALOMEDS::SComponent_ptr theComponent,
   }
 
   SALOMEDS::TMPFile_var aRealStreamFile = new SALOMEDS::TMPFile(real_size, real_size, buffer, 1);
-  
+
   return Load( theComponent, *(aRealStreamFile._retn()), theURL, isMultiFile );
 }
 
@@ -4323,7 +4666,7 @@ void SMESH_Gen_i::Close( SALOMEDS::SComponent_ptr theComponent )
 //     printf( "--------------------------- SMESH_Gen_i::Close, delete aGroup = %p \n", i_mesh->second );
 //     delete i_mesh->second;
 //   }
-  
+
 
   // delete SMESHDS_Mesh's
   // it's too long on big meshes
@@ -4331,7 +4674,7 @@ void SMESH_Gen_i::Close( SALOMEDS::SComponent_ptr theComponent )
 //     delete context->myDocument;
 //     context->myDocument = 0;
 //   }
-  
+
   myCurrentStudy = SALOMEDS::Study::_nil();
   return;
 }
@@ -4339,7 +4682,7 @@ void SMESH_Gen_i::Close( SALOMEDS::SComponent_ptr theComponent )
 //=============================================================================
 /*!
  *  SMESH_Gen_i::ComponentDataType
- * 
+ *
  *  Get component data type
  */
 //=============================================================================
@@ -4350,11 +4693,11 @@ char* SMESH_Gen_i::ComponentDataType()
   return CORBA::string_dup( "SMESH" );
 }
 
-    
+
 //=============================================================================
 /*!
  *  SMESH_Gen_i::IORToLocalPersistentID
- *  
+ *
  *  Transform data from transient form to persistent
  */
 //=============================================================================
@@ -4366,7 +4709,7 @@ char* SMESH_Gen_i::IORToLocalPersistentID( SALOMEDS::SObject_ptr /*theSObject*/,
 {
   if(MYDEBUG) MESSAGE( "SMESH_Gen_i::IORToLocalPersistentID" );
   StudyContext* myStudyContext = GetCurrentStudyContext();
-  
+
   if ( myStudyContext && strcmp( IORString, "" ) != 0 ) {
     int anId = myStudyContext->findId( IORString );
     if ( anId ) {
@@ -4404,7 +4747,7 @@ char* SMESH_Gen_i::LocalPersistentIDToIOR( SALOMEDS::SObject_ptr /*theSObject*/,
 
 //=======================================================================
 //function : RegisterObject
-//purpose  : 
+//purpose  :
 //=======================================================================
 
 int SMESH_Gen_i::RegisterObject(CORBA::Object_ptr theObject)
@@ -4458,21 +4801,21 @@ int SMESH_Gen_i::GetCurrentStudyID()
 {
   return myCurrentStudy->_is_nil() || myCurrentStudy->_non_existent() ? -1 : myCurrentStudy->StudyId();
 }
-    
+
 //=============================================================================
-/*! 
+/*!
  *  SMESHEngine_factory
  *
- *  C factory, accessible with dlsym, after dlopen  
+ *  C factory, accessible with dlsym, after dlopen
  */
 //=============================================================================
 
 extern "C"
 { SMESH_I_EXPORT
   PortableServer::ObjectId* SMESHEngine_factory( CORBA::ORB_ptr            orb,
-                                                 PortableServer::POA_ptr   poa, 
+                                                 PortableServer::POA_ptr   poa,
                                                  PortableServer::ObjectId* contId,
-                                                 const char*               instanceName, 
+                                                 const char*               instanceName,
                                                  const char*               interfaceName )
   {
     if(MYDEBUG) MESSAGE( "PortableServer::ObjectId* SMESHEngine_factory()" );