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Correct bug EDF#8655 PAL22677
[modules/med.git] / src / MEDLoader / MEDFileFieldOverView.cxx
index d531e4dd7b1ae416c82b65baef55de4d0337f6e2..bd1ac3fa1f5d5a5943d55b8146c8c81bdc66294d 100644 (file)
@@ -1,9 +1,9 @@
-// Copyright (C) 2007-2013  CEA/DEN, EDF R&D
+// Copyright (C) 2007-2014  CEA/DEN, EDF R&D
 //
 // This library is free software; you can redistribute it and/or
 // modify it under the terms of the GNU Lesser General Public
 // License as published by the Free Software Foundation; either
-// version 2.1 of the License.
+// version 2.1 of the License, or (at your option) any later version.
 //
 // This library is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of
 
 using namespace ParaMEDMEM;
 
+const unsigned char MEDMeshMultiLev::PARAMEDMEM_2_VTKTYPE[MEDMeshMultiLev::PARAMEDMEM_2_VTKTYPE_LGTH]=
+{1,3,21,5,9,7,22,34,23,28,255,255,255,255,10,14,13,255,12,255,24,255,16,27,255,26,255,29,255,255,25,42,36,4};
+
+const unsigned char MEDMeshMultiLev::HEXA27_PERM_ARRAY[27]={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,24,22,21,23,20,25,26};
+
+const char MEDFileField1TSStructItem2::NEWLY_CREATED_PFL_NAME[]="???";
+
 MEDFileMeshStruct *MEDFileMeshStruct::New(const MEDFileMesh *mesh)
 {
   return new MEDFileMeshStruct(mesh);
 }
 
-std::size_t MEDFileMeshStruct::getHeapMemorySize() const
+std::size_t MEDFileMeshStruct::getHeapMemorySizeWithoutChildren() const
 {
-  return 0;
+  std::size_t ret(0);
+  for(std::vector< std::vector<int> >::const_iterator it0=_geo_types_distrib.begin();it0!=_geo_types_distrib.end();it0++)
+    ret+=(*it0).capacity()*sizeof(int);
+  ret+=_geo_types_distrib.capacity()*sizeof(std::vector<int>);
+  return ret;
+}
+
+std::vector<const BigMemoryObject *> MEDFileMeshStruct::getDirectChildrenWithNull() const
+{
+  return std::vector<const BigMemoryObject *>();
 }
 
 MEDFileMeshStruct::MEDFileMeshStruct(const MEDFileMesh *mesh):_mesh(mesh)
 {
-  std::vector<int> levs=mesh->getNonEmptyLevels();
+  std::vector<int> levs(mesh->getNonEmptyLevels());
   _name=mesh->getName();
   _nb_nodes=mesh->getNumberOfNodes();
-  _geo_types_distrib.resize(levs.size());
-  for(std::vector<int>::const_iterator lev=levs.begin();lev!=levs.end();lev++)
+  if(!levs.empty())
     {
-      MEDCouplingAutoRefCountObjectPtr<MEDCouplingMesh> mLev=mesh->getGenMeshAtLevel(*lev);
-      _geo_types_distrib[-(*lev)]=mLev->getDistributionOfTypes();
+      _geo_types_distrib.resize(-(*std::min_element(levs.begin(),levs.end()))+1);
+      for(std::vector<int>::const_iterator lev=levs.begin();lev!=levs.end();lev++)
+        _geo_types_distrib[-(*lev)]=mesh->getDistributionOfTypes(*lev);
     }
 }
 
-int MEDFileMeshStruct::getLevelOfGeoType(INTERP_KERNEL::NormalizedCellType t) const throw(INTERP_KERNEL::Exception)
+int MEDFileMeshStruct::getLevelOfGeoType(INTERP_KERNEL::NormalizedCellType t) const
 {
   int j=0;
   for(std::vector< std::vector<int> >::const_iterator it1=_geo_types_distrib.begin();it1!=_geo_types_distrib.end();it1++,j--)
@@ -65,7 +81,10 @@ int MEDFileMeshStruct::getLevelOfGeoType(INTERP_KERNEL::NormalizedCellType t) co
   throw INTERP_KERNEL::Exception("MEDFileMeshStruct::getLevelOfGeoType : The specified geometric type is not present in the mesh structure !");
 }
 
-int MEDFileMeshStruct::getNumberOfElemsOfGeoType(INTERP_KERNEL::NormalizedCellType t) const throw(INTERP_KERNEL::Exception)
+/*!
+ * \sa MEDFileMeshStruct::doesManageGeoType
+ */
+int MEDFileMeshStruct::getNumberOfElemsOfGeoType(INTERP_KERNEL::NormalizedCellType t) const
 {
   for(std::vector< std::vector<int> >::const_iterator it1=_geo_types_distrib.begin();it1!=_geo_types_distrib.end();it1++)
     {
@@ -77,23 +96,1488 @@ int MEDFileMeshStruct::getNumberOfElemsOfGeoType(INTERP_KERNEL::NormalizedCellTy
         if((*it1)[3*i]==(int)t)
           return (*it1)[3*i+1];
     }
-  throw INTERP_KERNEL::Exception("The specified geometric type is not present in the mesh structure !");
-}
-
-int MEDFileMeshStruct::getNumberOfLevs() const
-{
-  return (int)_geo_types_distrib.size();
+  throw INTERP_KERNEL::Exception("The specified geometric type is not present in the mesh structure !");
+}
+
+/*!
+ * \sa MEDFileMeshStruct::getNumberOfElemsOfGeoType
+ */
+bool MEDFileMeshStruct::doesManageGeoType(INTERP_KERNEL::NormalizedCellType t) const
+{
+  for(std::vector< std::vector<int> >::const_iterator it1=_geo_types_distrib.begin();it1!=_geo_types_distrib.end();it1++)
+    {
+      std::size_t sz=(*it1).size();
+      if(sz%3!=0)
+        throw INTERP_KERNEL::Exception("MEDFileMeshStruct::doesManageGeoType : internal error in code !");
+      std::size_t nbGeo=sz/3;
+      for(std::size_t i=0;i<nbGeo;i++)
+        if((*it1)[3*i]==(int)t)
+          return true;
+    }
+  return false;
+}
+
+void MEDFileMeshStruct::appendIfImplicitType(INTERP_KERNEL::NormalizedCellType t)
+{
+  if(!_mesh->hasImplicitPart())
+    throw INTERP_KERNEL::Exception("MEDFileMeshStruct::appendIfImplicitType : by default no implicit geo type can be appended !");
+  static const char MSG[]="MEDFileMeshStruct::appendIfImplicitType : the distribution does not looks like structured standard !";
+  if(_geo_types_distrib.size()!=1)
+    throw INTERP_KERNEL::Exception(MSG);
+  std::size_t sz(_geo_types_distrib[0].size());
+  if(sz%3!=0)
+    throw INTERP_KERNEL::Exception("MEDFileMeshStruct::appendIfImplicitType : internal error in code !");
+  std::size_t nbGeo(sz/3);
+  if(nbGeo!=1)
+    throw INTERP_KERNEL::Exception(MSG);
+  std::vector<int> arr(3); arr[0]=(int)t; arr[1]=_mesh->buildImplicitPartIfAny(t); arr[2]=-1;
+  _geo_types_distrib.push_back(arr);
+}
+
+
+int MEDFileMeshStruct::getNumberOfLevs() const
+{
+  return (int)_geo_types_distrib.size();
+}
+
+int MEDFileMeshStruct::getNumberOfGeoTypesInLev(int relativeLev) const
+{
+  int pos(-relativeLev);
+  if(pos<0 || pos>=(int)_geo_types_distrib.size())
+    throw INTERP_KERNEL::Exception("MEDFileMeshStruct::getNumberOfGeoTypesInLev : invalid level specified !");
+  std::size_t sz=_geo_types_distrib[pos].size();
+  if(sz%3!=0)
+    throw INTERP_KERNEL::Exception("MEDFileMeshStruct::getNumberOfGeoTypesInLev : internal error in code !");
+  return (int)(sz/3);
+}
+
+//=
+
+std::size_t MEDMeshMultiLev::getHeapMemorySizeWithoutChildren() const
+{
+  return 0;
+}
+
+std::vector<const BigMemoryObject *> MEDMeshMultiLev::getDirectChildrenWithNull() const
+{
+  return std::vector<const BigMemoryObject *>();
+}
+
+MEDMeshMultiLev *MEDMeshMultiLev::New(const MEDFileMesh *m, const std::vector<int>& levs)
+{
+  if(!m)
+    throw INTERP_KERNEL::Exception("MEDMeshMultiLev::New : null input pointer !");
+  const MEDFileUMesh *um(dynamic_cast<const MEDFileUMesh *>(m));
+  if(um)
+    return MEDUMeshMultiLev::New(um,levs);
+  const MEDFileCMesh *cm(dynamic_cast<const MEDFileCMesh *>(m));
+  if(cm)
+    return MEDCMeshMultiLev::New(cm,levs);
+  const MEDFileCurveLinearMesh *clm(dynamic_cast<const MEDFileCurveLinearMesh *>(m));
+  if(clm)
+    return MEDCurveLinearMeshMultiLev::New(clm,levs);
+  throw INTERP_KERNEL::Exception("MEDMeshMultiLev::New : unrecognized type of mesh ! Must be in [MEDFileUMesh,MEDFileCMesh,MEDFileCurveLinearMesh] !");
+}
+
+MEDMeshMultiLev *MEDMeshMultiLev::New(const MEDFileMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities)
+{
+  if(!m)
+    throw INTERP_KERNEL::Exception("MEDMeshMultiLev::New 2 : null input pointer !");
+  const MEDFileUMesh *um(dynamic_cast<const MEDFileUMesh *>(m));
+  if(um)
+    return MEDUMeshMultiLev::New(um,gts,pfls,nbEntities);
+  const MEDFileCMesh *cm(dynamic_cast<const MEDFileCMesh *>(m));
+  if(cm)
+    return MEDCMeshMultiLev::New(cm,gts,pfls,nbEntities);
+  const MEDFileCurveLinearMesh *clm(dynamic_cast<const MEDFileCurveLinearMesh *>(m));
+  if(clm)
+    return MEDCurveLinearMeshMultiLev::New(clm,gts,pfls,nbEntities);
+  throw INTERP_KERNEL::Exception("MEDMeshMultiLev::New 2 : unrecognized type of mesh ! Must be in [MEDFileUMesh,MEDFileCMesh,MEDFileCurveLinearMesh] !");
+}
+
+MEDMeshMultiLev *MEDMeshMultiLev::NewOnlyOnNode(const MEDFileMesh *m, const DataArrayInt *pflOnNode)
+{
+  MEDCouplingAutoRefCountObjectPtr<MEDMeshMultiLev> ret(MEDMeshMultiLev::New(m,m->getNonEmptyLevels()));
+  ret->selectPartOfNodes(pflOnNode);
+  return ret.retn();
+}
+
+void MEDMeshMultiLev::setNodeReduction(const DataArrayInt *nr)
+{
+  if(nr)
+    nr->incrRef();
+  _node_reduction=const_cast<DataArrayInt*>(nr);
+}
+
+void MEDMeshMultiLev::setCellReduction(const DataArrayInt *cr)
+{
+  if(_pfls.size()!=1)
+    throw INTERP_KERNEL::Exception("MEDMeshMultiLev::setCellReduction : can be used only for single geo type mesh !");
+  _pfls[0]=const_cast<DataArrayInt*>(cr);
+  if(cr)
+    cr->incrRef();
+}
+
+bool MEDMeshMultiLev::isFastlyTheSameStruct(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs) const
+{
+  if(fst.getType()==ON_NODES)
+    {
+      if(fst.getNumberOfItems()!=1)
+        throw INTERP_KERNEL::Exception("MEDMeshMultiLev::isFastlyTheSameStruct : unexpected situation for nodes !");
+      const MEDFileField1TSStructItem2& p(fst[0]);
+      std::string pflName(p.getPflName());
+      const DataArrayInt *nr(_node_reduction);
+      if(pflName.empty() && !nr)
+        return true;
+      if(!pflName.empty() && !nr)
+        return false;
+      if(pflName==nr->getName())
+        return true;
+      return false;
+    }
+  else
+    {
+      std::size_t sz(fst.getNumberOfItems());
+      if(sz!=_geo_types.size())
+        return false;
+      int strt(0);
+      for(std::size_t i=0;i<sz;i++)
+        {
+          const MEDFileField1TSStructItem2& p(fst[i]);
+          if(!p.isFastlyEqual(strt,_geo_types[i],getPflNameOfId(i).c_str()))
+            return false;
+        }
+      return true;
+    }
+}
+
+DataArray *MEDMeshMultiLev::buildDataArray(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs, const DataArray *vals) const
+{
+  MEDCouplingAutoRefCountObjectPtr<DataArray> ret(const_cast<DataArray *>(vals)); ret->incrRef();
+  if(isFastlyTheSameStruct(fst,globs))
+    return ret.retn();
+  else
+    return constructDataArray(fst,globs,vals);
+}
+
+/*!
+ * \param [out] famIds - Can be null. If not null the instance has to be dealt by the caller (decrRef).
+ * \param [out] isWithoutCopy - When true the returned instance \a famIds if not null is directly those in the data structure.
+ */
+void MEDMeshMultiLev::retrieveFamilyIdsOnCells(DataArrayInt *& famIds, bool& isWithoutCopy) const
+{
+  const DataArrayInt *fids(_cell_fam_ids);
+  if(!fids)
+    { famIds=0; isWithoutCopy=true; return ; }
+  std::size_t sz(_geo_types.size());
+  bool presenceOfPfls(false);
+  for(std::size_t i=0;i<sz && !presenceOfPfls;i++)
+    {
+      const DataArrayInt *pfl(_pfls[i]);
+      if(pfl)
+        presenceOfPfls=true;
+    }
+  if(!presenceOfPfls)
+    { famIds=const_cast<DataArrayInt *>(fids); famIds->incrRef(); isWithoutCopy=_mesh->isObjectInTheProgeny(famIds); return ; }
+  //bad luck the slowest part
+  isWithoutCopy=false;
+  std::vector< MEDCouplingAutoRefCountObjectPtr<DataArrayInt> > retSafe(sz);
+  std::vector< const DataArrayInt *> ret(sz);
+  int start(0);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      const DataArrayInt *pfl(_pfls[i]);
+      int lgth(_nb_entities[i]);
+      if(pfl)
+        {
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp(fids->selectByTupleId2(start,start+lgth,1));
+          retSafe[i]=tmp->selectByTupleIdSafe(pfl->begin(),pfl->end());
+        }
+      else
+        {
+          retSafe[i]=fids->selectByTupleId2(start,start+lgth,1);
+        }
+      ret[i]=retSafe[i];
+      start+=lgth;
+    }
+  famIds=DataArrayInt::Aggregate(ret);
+}
+
+/*!
+ * \param [out] numIds - Can be null. If not null the instance has to be dealt by the caller (decrRef).
+ * \param [out] isWithoutCopy - When true the returned instance \a numIds if not null is directly those in the data structure.
+ */
+void MEDMeshMultiLev::retrieveNumberIdsOnCells(DataArrayInt *& numIds, bool& isWithoutCopy) const
+{
+  const DataArrayInt *nids(_cell_num_ids);
+  if(!nids)
+    { numIds=0; isWithoutCopy=true; return ; }
+  std::size_t sz(_geo_types.size());
+  bool presenceOfPfls(false);
+  for(std::size_t i=0;i<sz && !presenceOfPfls;i++)
+    {
+      const DataArrayInt *pfl(_pfls[i]);
+      if(pfl)
+        presenceOfPfls=true;
+    }
+  if(!presenceOfPfls)
+    { numIds=const_cast<DataArrayInt *>(nids); numIds->incrRef(); isWithoutCopy=_mesh->isObjectInTheProgeny(numIds); return ; }
+  //bad luck the slowest part
+  isWithoutCopy=false;
+  std::vector< MEDCouplingAutoRefCountObjectPtr<DataArrayInt> > retSafe(sz);
+  std::vector< const DataArrayInt *> ret(sz);
+  int start(0);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      const DataArrayInt *pfl(_pfls[i]);
+      int lgth(_nb_entities[i]);
+      if(pfl)
+        {
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp(nids->selectByTupleId2(start,start+lgth,1));
+          retSafe[i]=tmp->selectByTupleIdSafe(pfl->begin(),pfl->end());
+        }
+      else
+        {
+          retSafe[i]=nids->selectByTupleId2(start,start+lgth,1);
+        }
+      ret[i]=retSafe[i];
+      start+=lgth;
+    }
+  numIds=DataArrayInt::Aggregate(ret);
+}
+
+/*!
+ * \param [out] famIds - Can be null. If not null the instance has to be dealt by the caller (decrRef).
+ * \param [out] isWithoutCopy - When true the returned instance \a famIds if not null is directly those in the data structure.
+ */
+void MEDMeshMultiLev::retrieveFamilyIdsOnNodes(DataArrayInt *& famIds, bool& isWithoutCopy) const
+{
+  const DataArrayInt *fids(_node_fam_ids);
+  if(!fids)
+    { famIds=0; isWithoutCopy=true; return ; }
+  const DataArrayInt *nr(_node_reduction);
+  if(nr)
+    {
+      isWithoutCopy=false;
+      famIds=fids->selectByTupleIdSafe(nr->begin(),nr->end());
+    }
+  else
+    {
+      famIds=const_cast<DataArrayInt *>(fids); famIds->incrRef();
+      isWithoutCopy=_mesh->isObjectInTheProgeny(famIds);
+    }
+}
+
+/*!
+ * \param [out] numIds - Can be null. If not null the instance has to be dealt by the caller (decrRef).
+ * \param [out] isWithoutCopy - When true the returned instance \a numIds if not null is directly those in the data structure.
+ */
+void MEDMeshMultiLev::retrieveNumberIdsOnNodes(DataArrayInt *& numIds, bool& isWithoutCopy) const
+{
+  const DataArrayInt *fids(_node_num_ids);
+  if(!fids)
+    { numIds=0; isWithoutCopy=true; return ; }
+  const DataArrayInt *nr(_node_reduction);
+  if(nr)
+    {
+      isWithoutCopy=false;
+      numIds=fids->selectByTupleIdSafe(nr->begin(),nr->end());
+    }
+  else
+    {
+      numIds=const_cast<DataArrayInt *>(fids); numIds->incrRef();
+      isWithoutCopy=_mesh->isObjectInTheProgeny(numIds);
+    }
+}
+
+std::vector< INTERP_KERNEL::NormalizedCellType > MEDMeshMultiLev::getGeoTypes() const
+{
+  return _geo_types;
+}
+
+void MEDMeshMultiLev::setFamilyIdsOnCells(DataArrayInt *famIds)
+{
+  _cell_fam_ids=famIds;
+  if(famIds)
+    famIds->incrRef();
+}
+
+void MEDMeshMultiLev::setNumberIdsOnCells(DataArrayInt *numIds)
+{
+  _cell_num_ids=numIds;
+  if(numIds)
+    numIds->incrRef();
+}
+
+void MEDMeshMultiLev::setFamilyIdsOnNodes(DataArrayInt *famIds)
+{
+  _node_fam_ids=famIds;
+  if(famIds)
+    famIds->incrRef();
+}
+
+void MEDMeshMultiLev::setNumberIdsOnNodes(DataArrayInt *numIds)
+{
+  _node_num_ids=numIds;
+  if(numIds)
+    numIds->incrRef();
+}
+
+std::string MEDMeshMultiLev::getPflNameOfId(int id) const
+{
+  std::size_t sz(_pfls.size());
+  if(id<0 || id>=(int)sz)
+    throw INTERP_KERNEL::Exception("MEDMeshMultiLev::getPflNameOfId : invalid input id !");
+  const DataArrayInt *pfl(_pfls[id]);
+  if(!pfl)
+    return std::string("");
+  return pfl->getName();
+}
+
+/*!
+ * Returns the number of cells having geometric type \a t.
+ * The profiles are **NOT** taken into account here.
+ */
+int MEDMeshMultiLev::getNumberOfCells(INTERP_KERNEL::NormalizedCellType t) const
+{
+  std::size_t sz(_nb_entities.size());
+  for(std::size_t i=0;i<sz;i++)
+    if(_geo_types[i]==t)
+      return _nb_entities[i];
+  throw INTERP_KERNEL::Exception("MEDMeshMultiLev::getNumberOfCells : not existing geometric type in this !");
+}
+
+int MEDMeshMultiLev::getNumberOfNodes() const
+{
+  return _nb_nodes;
+}
+
+DataArray *MEDMeshMultiLev::constructDataArray(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs, const DataArray *vals) const
+{
+  if(fst.getType()==ON_NODES)
+    {
+      if(fst.getNumberOfItems()!=1)
+        throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for nodes !");
+      const MEDFileField1TSStructItem2& p(fst[0]);
+      std::string pflName(p.getPflName());
+      const DataArrayInt *nr(_node_reduction);
+      if(pflName.empty() && !nr)
+        return vals->deepCpy();
+      if(pflName.empty() && nr)
+        throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for nodes 2 !");
+      if(!pflName.empty() && nr)
+        {
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(globs->getProfile(pflName.c_str())->deepCpy());
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p2(nr->deepCpy());
+          p1->sort(true); p2->sort(true);
+          if(!p1->isEqualWithoutConsideringStr(*p2))
+            throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : it appears that a profile on nodes does not cover the cells correctly !");
+          p1=DataArrayInt::FindPermutationFromFirstToSecond(globs->getProfile(pflName.c_str()),nr);
+          MEDCouplingAutoRefCountObjectPtr<DataArray> ret(vals->deepCpy());
+          ret->renumberInPlace(p1->begin());
+          return ret.retn();
+        }
+      if(!pflName.empty() && !nr)
+        {
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(globs->getProfile(pflName.c_str())->deepCpy());
+          p1->sort(true);
+          if(!p1->isIdentity() || p1->getNumberOfTuples()!=getNumberOfNodes())
+            throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for nodes 4 !");
+          MEDCouplingAutoRefCountObjectPtr<DataArray> ret(vals->deepCpy());
+          ret->renumberInPlace(globs->getProfile(pflName.c_str())->begin());
+          return ret.retn();
+        }
+      throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for nodes 5 !");
+    }
+  else
+    {
+      std::size_t sz(fst.getNumberOfItems());
+      std::set<INTERP_KERNEL::NormalizedCellType> s(_geo_types.begin(),_geo_types.end());
+      if(s.size()!=_geo_types.size())
+        throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 2 !");
+      std::vector< const DataArray *> arr(s.size());
+      std::vector< MEDCouplingAutoRefCountObjectPtr<DataArray> > arrSafe(s.size());
+      int iii(0);
+      int nc(vals->getNumberOfComponents());
+      std::vector<std::string> compInfo(vals->getInfoOnComponents());
+      for(std::vector< INTERP_KERNEL::NormalizedCellType >::const_iterator it=_geo_types.begin();it!=_geo_types.end();it++,iii++)
+        {
+          const DataArrayInt *thisP(_pfls[iii]);
+          std::vector<const MEDFileField1TSStructItem2 *> ps;
+          for(std::size_t i=0;i<sz;i++)
+            {
+              const MEDFileField1TSStructItem2& p(fst[i]);
+              if(p.getGeo()==*it)
+                ps.push_back(&p);
+            }
+          if(ps.empty())
+            throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 1 !");
+          if(ps.size()==1)
+            {
+              int nbi(ps[0]->getNbOfIntegrationPts(globs));
+              const DataArrayInt *otherP(ps[0]->getPfl(globs));
+              const std::pair<int,int>& strtStop(ps[0]->getStartStop());
+              MEDCouplingAutoRefCountObjectPtr<DataArray> ret(vals->selectByTupleId2(strtStop.first,strtStop.second,1));
+              if(!thisP && !otherP)
+                {
+                  arrSafe[iii]=ret; arr[iii]=ret;
+                  continue;
+                }
+              if(thisP && otherP)
+                {
+                  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(otherP->invertArrayN2O2O2N(getNumberOfCells(ps[0]->getGeo())));
+                  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p2(thisP->deepCpy());
+                  p2->transformWithIndArr(p1->begin(),p1->end());
+                  //p1=p2->getIdsNotEqual(-1);
+                  //p1=p2->selectByTupleIdSafe(p1->begin(),p1->end());
+                  ret->rearrange(nbi*nc); ret=ret->selectByTupleIdSafe(p2->begin(),p2->end()); ret->rearrange(nc); ret->setInfoOnComponents(compInfo);
+                  arrSafe[iii]=ret; arr[iii]=ret;
+                  continue;
+                }
+              if(!thisP && otherP)
+                {
+                  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(otherP->deepCpy());
+                  p1->sort(true);
+                  p1->checkAllIdsInRange(0,getNumberOfCells(ps[0]->getGeo()));
+                  p1=DataArrayInt::FindPermutationFromFirstToSecond(otherP,p1);
+                  ret->rearrange(nbi*nc); ret->renumberInPlace(p1->begin()); ret->rearrange(nc); ret->setInfoOnComponents(compInfo);
+                  arrSafe[iii]=ret; arr[iii]=ret;
+                  continue;
+                }
+              throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 3 !");
+            }
+          else
+            {
+              std::vector< const DataArrayInt * >otherPS(ps.size());
+              std::vector< const DataArray * > arr2(ps.size());
+              std::vector< MEDCouplingAutoRefCountObjectPtr<DataArray> > arr2Safe(ps.size());
+              std::vector< const DataArrayInt * > nbis(ps.size());
+              std::vector< MEDCouplingAutoRefCountObjectPtr<DataArrayInt> > nbisSafe(ps.size());
+              int jj(0);
+              for(std::vector<const MEDFileField1TSStructItem2 *>::const_iterator it2=ps.begin();it2!=ps.end();it2++,jj++)
+                {
+                  int nbi((*it2)->getNbOfIntegrationPts(globs));
+                  const DataArrayInt *otherPfl((*it2)->getPfl(globs));
+                  const std::pair<int,int>& strtStop((*it2)->getStartStop());
+                  MEDCouplingAutoRefCountObjectPtr<DataArray> ret2(vals->selectByTupleId2(strtStop.first,strtStop.second,1));
+                  if(!otherPfl)
+                    throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 4 !");
+                  arr2[jj]=ret2; arr2Safe[jj]=ret2; otherPS[jj]=otherPfl;
+                  nbisSafe[jj]=DataArrayInt::New(); nbisSafe[jj]->alloc(otherPfl->getNumberOfTuples(),1); nbisSafe[jj]->fillWithValue(nbi);
+                  nbis[jj]=nbisSafe[jj];
+                }
+              MEDCouplingAutoRefCountObjectPtr<DataArray> arr3(DataArray::Aggregate(arr2));
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> otherP(DataArrayInt::Aggregate(otherPS));
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> zenbis(DataArrayInt::Aggregate(nbis));
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> otherPN(otherP->invertArrayN2O2O2N(getNumberOfCells(*it)));
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1;
+              if(thisP)
+                p1=DataArrayInt::FindPermutationFromFirstToSecond(otherP,thisP);
+              else
+                p1=otherP->deepCpy();
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> zenbisN(zenbis->renumber(p1->begin()));
+              zenbisN->computeOffsets2();
+              jj=0;
+              for(std::vector<const MEDFileField1TSStructItem2 *>::const_iterator it2=ps.begin();it2!=ps.end();it2++,jj++)
+                {
+                  //int nbi((*it2)->getNbOfIntegrationPts(globs));
+                  const DataArrayInt *otherPfl((*it2)->getPfl(globs));
+                  const std::pair<int,int>& strtStop((*it2)->getStartStop());
+                  MEDCouplingAutoRefCountObjectPtr<DataArray> ret2(vals->selectByTupleId2(strtStop.first,strtStop.second,1));
+                  //
+                  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p2(otherPfl->deepCpy());
+                  p2->transformWithIndArr(otherPN->begin(),otherPN->end());
+                  p2->transformWithIndArr(p1->begin(),p1->end());
+                  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> idsN(p2->buildExplicitArrByRanges(zenbisN));
+                  arr3->setPartOfValuesBase3(ret2,idsN->begin(),idsN->end(),0,nc,1);
+                }
+              arrSafe[iii]=arr3; arr[iii]=arr3;
+              continue;
+            }
+        }
+      return DataArray::Aggregate(arr);
+    }
+}
+
+/*!
+ * This method is called to add NORM_POINT1 cells in \a this so that orphan nodes in \a verticesToAdd will be fetched.
+ */
+void MEDMeshMultiLev::appendVertices(const DataArrayInt *verticesToAdd, DataArrayInt *nr)
+{
+  int nbOfVertices(verticesToAdd->getNumberOfTuples());
+  std::size_t sz(_pfls.size());
+  _pfls.resize(sz+1);
+  _geo_types.resize(sz+1,INTERP_KERNEL::NORM_POINT1);
+  _nb_entities.resize(sz+1,nbOfVertices);
+  _node_reduction=nr; nr->incrRef();
+  _nb_nodes+=nbOfVertices;
+  const DataArrayInt *cf(_cell_fam_ids),*cn(_cell_num_ids),*nf(_node_fam_ids),*nn(_node_num_ids);
+  if(cf)
+    {
+      MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp;
+      std::vector<const DataArrayInt *> a(2);
+      a[0]=cf;
+      if(nf)
+        tmp=nf->selectByTupleIdSafe(verticesToAdd->begin(),verticesToAdd->end());
+      else
+        {
+          tmp=DataArrayInt::New(); tmp->alloc(nbOfVertices,1); tmp->fillWithZero();
+        }
+      a[1]=tmp;
+      _cell_fam_ids=DataArrayInt::Aggregate(a);
+    }
+  if(cn)
+    {
+      MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp;
+      std::vector<const DataArrayInt *> a(2);
+      a[0]=cn;
+      if(nn)
+        tmp=nn->selectByTupleIdSafe(verticesToAdd->begin(),verticesToAdd->end());
+      else
+        {
+          tmp=DataArrayInt::New(); tmp->alloc(nbOfVertices,1); tmp->fillWithZero();
+        }
+      a[1]=tmp;
+      _cell_num_ids=DataArrayInt::Aggregate(a);
+    }
+}
+
+MEDMeshMultiLev::MEDMeshMultiLev(const MEDFileMesh *mesh):_mesh(mesh),_nb_nodes(0)
+{
+}
+
+MEDMeshMultiLev::MEDMeshMultiLev(const MEDFileMesh *mesh, int nbNodes, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):_mesh(mesh),_geo_types(gts),_nb_entities(nbEntities),_nb_nodes(nbNodes)
+{
+  std::size_t sz(_geo_types.size());
+  if(sz!=pfls.size() || sz!=nbEntities.size())
+    throw INTERP_KERNEL::Exception("MEDMeshMultiLev::MEDMeshMultiLev : input vector must have the same size !");
+  _pfls.resize(sz);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      if(pfls[i])
+        pfls[i]->incrRef();
+      _pfls[i]=const_cast<DataArrayInt *>(pfls[i]);
+    }
+}
+
+MEDMeshMultiLev::MEDMeshMultiLev(const MEDMeshMultiLev& other):RefCountObject(other),_mesh(other._mesh),_pfls(other._pfls),_geo_types(other._geo_types),_nb_entities(other._nb_entities),_node_reduction(other._node_reduction),_nb_nodes(other._nb_nodes),_cell_fam_ids(other._cell_fam_ids),_cell_num_ids(other._cell_num_ids),_node_fam_ids(other._node_fam_ids),_node_num_ids(other._node_num_ids)
+{
+}
+
+//=
+
+MEDUMeshMultiLev *MEDUMeshMultiLev::New(const MEDFileUMesh *m, const std::vector<int>& levs)
+{
+  return new MEDUMeshMultiLev(m,levs);
+}
+
+MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDFileUMesh *m, const std::vector<int>& levs):MEDMeshMultiLev(m)
+{
+  if(!m)
+    throw INTERP_KERNEL::Exception("MEDUMeshMultiLev constructor : null input pointer !");
+  std::vector<MEDCoupling1GTUMesh *> v;
+  for(std::vector<int>::const_iterator it=levs.begin();it!=levs.end();it++)
+    {
+      std::vector<MEDCoupling1GTUMesh *> vTmp(m->getDirectUndergroundSingleGeoTypeMeshes(*it));
+      v.insert(v.end(),vTmp.begin(),vTmp.end());
+    }
+  std::size_t sz(v.size());
+  if(v.empty())
+    {
+      _coords=m->getCoords(); _coords->incrRef();
+    }
+  _parts.resize(sz);
+  _pfls.resize(sz);
+  _geo_types.resize(sz);
+  _nb_entities.resize(sz);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      MEDCoupling1GTUMesh *obj(v[i]);
+      if(obj)
+        obj->incrRef();
+      else
+        throw INTERP_KERNEL::Exception("MEDUMeshMultiLev constructor : presence of a null pointer !");
+      _parts[i]=obj;
+      _geo_types[i]=obj->getCellModelEnum();
+      _nb_entities[i]=obj->getNumberOfCells();
+    }
+  // ids fields management
+  bool cellFamIdsNoCpy(levs.size()==1);
+  if(cellFamIdsNoCpy)
+    {
+      const DataArrayInt *tmp(m->getFamilyFieldAtLevel(levs[0]));
+      if(tmp)
+        {
+          tmp->incrRef();
+          _cell_fam_ids=(const_cast<DataArrayInt *>(tmp));
+        }
+    }
+  else
+    {
+      std::vector<const DataArrayInt *> tmps(levs.size());
+      bool f(true);
+      for(std::size_t i=0;i<levs.size();i++)
+        {
+          tmps[i]=m->getFamilyFieldAtLevel(levs[i]);
+          if(!tmps[i])
+            f=false;
+        }
+      if(f && !tmps.empty())
+        _cell_fam_ids=DataArrayInt::Aggregate(tmps);
+    }
+  bool cellNumIdsNoCpy(levs.size()==1);
+  if(cellNumIdsNoCpy)
+    {
+      const DataArrayInt *tmp(m->getNumberFieldAtLevel(levs[0]));
+      if(tmp)
+        {
+          tmp->incrRef();
+          _cell_num_ids=(const_cast<DataArrayInt *>(tmp));
+        }
+    }
+  else
+    {
+      std::vector<const DataArrayInt *> tmps(levs.size());
+      bool n(true);
+      for(std::size_t i=0;i<levs.size();i++)
+        {
+          tmps[i]=m->getNumberFieldAtLevel(levs[i]);
+          if(!tmps[i])
+            n=false;
+        }
+      if(n && !tmps.empty())
+        _cell_num_ids=DataArrayInt::Aggregate(tmps);
+    }
+  // node part
+  {
+    const DataArrayInt *tmp(m->getFamilyFieldAtLevel(1));
+    if(tmp)
+      {
+        tmp->incrRef();
+        _node_fam_ids=(const_cast<DataArrayInt *>(tmp));
+      }
+  }
+  {
+    const DataArrayInt *tmp(m->getNumberFieldAtLevel(1));
+    if(tmp)
+      {
+        tmp->incrRef();
+        _node_num_ids=(const_cast<DataArrayInt *>(tmp));
+      }
+  }
+}
+
+MEDUMeshMultiLev *MEDUMeshMultiLev::New(const MEDFileUMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities)
+{
+  return new MEDUMeshMultiLev(m,gts,pfls,nbEntities);
+}
+
+MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDFileUMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDMeshMultiLev(m,m->getNumberOfNodes(),gts,pfls,nbEntities)
+{
+  std::size_t sz(gts.size());
+  if(sz<1)
+    throw INTERP_KERNEL::Exception("constructor of MEDUMeshMultiLev : number of different geo type must be >= 1 !");
+  unsigned dim(INTERP_KERNEL::CellModel::GetCellModel(gts[0]).getDimension());
+  _parts.resize(sz);
+  bool isSameDim(true),isNoPfl(true);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      MEDCoupling1GTUMesh *elt(m->getDirectUndergroundSingleGeoTypeMesh(gts[i]));
+      if(INTERP_KERNEL::CellModel::GetCellModel(gts[i]).getDimension()!=dim)
+        isSameDim=false;
+      if(pfls[i])
+        isNoPfl=false;
+      if(elt)
+        elt->incrRef();
+      _parts[i]=elt;
+    }
+  // ids fields management
+  int lev((int)dim-m->getMeshDimension());
+  if(isSameDim && isNoPfl && m->getGeoTypesAtLevel(lev)==gts)//optimized part
+    {
+      const DataArrayInt *famIds(m->getFamilyFieldAtLevel(lev));
+      if(famIds)
+        { _cell_fam_ids=const_cast<DataArrayInt*>(famIds); famIds->incrRef(); }
+      const DataArrayInt *numIds(m->getNumberFieldAtLevel(lev));
+      if(numIds)
+        { _cell_num_ids=const_cast<DataArrayInt*>(numIds); numIds->incrRef(); }
+      famIds=m->getFamilyFieldAtLevel(1);
+      if(famIds)
+        { _node_fam_ids=const_cast<DataArrayInt*>(famIds); famIds->incrRef(); }
+      numIds=m->getNumberFieldAtLevel(1);
+      if(numIds)
+        { _node_num_ids=const_cast<DataArrayInt*>(numIds); numIds->incrRef(); }
+      return ;
+    }
+  //
+  std::vector< MEDCouplingAutoRefCountObjectPtr<DataArrayInt> > famIdsSafe(sz);
+  std::vector<const DataArrayInt *> famIds(sz);
+  bool f(true);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      famIdsSafe[i]=m->extractFamilyFieldOnGeoType(gts[i]);
+      famIds[i]=famIdsSafe[i];
+      if(!famIds[i])
+        f=false;
+    }
+  if(f)
+    _cell_fam_ids=DataArrayInt::Aggregate(famIds);
+  std::vector< MEDCouplingAutoRefCountObjectPtr<DataArrayInt> > numIdsSafe(sz);
+  std::vector<const DataArrayInt *> numIds(sz);
+  bool n(true);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      numIdsSafe[i]=m->extractNumberFieldOnGeoType(gts[i]);
+      numIds[i]=numIdsSafe[i];
+      if(!numIds[i])
+        n=false;
+    }
+  if(n)
+    _cell_num_ids=DataArrayInt::Aggregate(numIds);
+  // node ids management
+  const DataArrayInt *nodeFamIds(m->getFamilyFieldAtLevel(1));
+  if(nodeFamIds)
+    { _node_fam_ids=const_cast<DataArrayInt*>(nodeFamIds); nodeFamIds->incrRef(); }
+  const DataArrayInt *nodeNumIds(m->getNumberFieldAtLevel(1));
+  if(nodeNumIds)
+    { _node_num_ids=const_cast<DataArrayInt*>(nodeNumIds); nodeNumIds->incrRef(); }
+}
+
+void MEDUMeshMultiLev::selectPartOfNodes(const DataArrayInt *pflNodes)
+{
+  if(!pflNodes || !pflNodes->isAllocated())
+    return ;
+  std::size_t sz(_parts.size());
+  std::vector< MEDCouplingAutoRefCountObjectPtr<DataArrayInt> > a(sz);
+  std::vector< const DataArrayInt *> aa(sz);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      const DataArrayInt *pfl(_pfls[i]);
+      MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> m(_parts[i]);
+      if(pfl)
+        m=dynamic_cast<MEDCoupling1GTUMesh *>(_parts[i]->buildPartOfMySelfKeepCoords(pfl->begin(),pfl->end()));
+      DataArrayInt *cellIds=0;
+      m->fillCellIdsToKeepFromNodeIds(pflNodes->begin(),pflNodes->end(),true,cellIds);
+      MEDCouplingAutoRefCountObjectPtr<DataArrayInt> cellIdsSafe(cellIds);
+      MEDCouplingAutoRefCountObjectPtr<MEDCouplingPointSet> m2(m->buildPartOfMySelfKeepCoords(cellIds->begin(),cellIds->end()));
+      int tmp=-1;
+      MEDCouplingAutoRefCountObjectPtr<DataArrayInt> o2n(m2->getNodeIdsInUse(tmp));
+      a[i]=o2n->invertArrayO2N2N2O(tmp); aa[i]=a[i];
+      if(pfl)
+        _pfls[i]=pfl->selectByTupleIdSafe(cellIds->begin(),cellIds->end());
+      else
+        _pfls[i]=cellIdsSafe;
+    }
+  if(!aa.empty())
+    _node_reduction=DataArrayInt::Aggregate(aa);//general case
+  else
+    _node_reduction=pflNodes->deepCpy();//case where no cells in read mesh.
+  _node_reduction->sort(true);
+  _node_reduction=_node_reduction->buildUnique();
+  if(_node_reduction->getNumberOfTuples()==pflNodes->getNumberOfTuples())
+    return ;//This is the classical case where the input node profile corresponds perfectly to a subset of cells in _parts
+  if(_node_reduction->getNumberOfTuples()>pflNodes->getNumberOfTuples())
+    throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::selectPartOfNodes : internal error in MEDCoupling during cell select from a list of nodes !");
+  // Here the cells available in _parts is not enough to cover all the nodes in pflNodes. So adding vertices cells in _parts...
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> pflNodes2(pflNodes->deepCpy());
+  pflNodes2->sort(true);
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> diff(pflNodes2->buildSubstractionOptimized(_node_reduction));
+  appendVertices(diff,pflNodes2);
+}
+
+MEDMeshMultiLev *MEDUMeshMultiLev::prepare() const
+{
+  return new MEDUMeshMultiLev(*this);
+}
+
+MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDUMeshMultiLev& other):MEDMeshMultiLev(other),_parts(other._parts),_coords(other._coords)
+{
+}
+
+MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDStructuredMeshMultiLev& other, const MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh>& part):MEDMeshMultiLev(other)
+{
+  _parts.resize(1);
+  _parts[0]=part;
+  _geo_types.resize(1); _geo_types[0]=part->getCellModelEnum();
+  _nb_entities.resize(1); _nb_entities[0]=part->getNumberOfCells();
+  _pfls.resize(1); _pfls[0]=0;
+}
+
+/*! 
+ * To be called only once ! Because due to some optimizations (sometimes aggressive) the internal state can be changed...
+ * If returned value is false output pointer \a coords is not the internal pointer. If returned value is true output pointer \a coords is directly the internal pointer.
+ * If true is returned, the \a coords output parameter should be used with care (non const method call) to avoid to change the internal state of MEDFileUMesh instance.
+ */
+bool MEDUMeshMultiLev::buildVTUArrays(DataArrayDouble *& coords, DataArrayByte *&types, DataArrayInt *&cellLocations, DataArrayInt *& cells, DataArrayInt *&faceLocations, DataArrayInt *&faces) const
+{
+  const DataArrayDouble *tmp(0);
+  if(_parts.empty())
+    tmp=_coords;
+  else
+    tmp=_parts[0]->getCoords();
+  if(!tmp)
+    throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : the coordinates are null !");
+  MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> a(const_cast<DataArrayDouble *>(tmp)); tmp->incrRef();
+  int szBCE(0),szD(0),szF(0);
+  bool isPolyh(false);
+  int iii(0);
+  for(std::vector< MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> >::const_iterator it=_parts.begin();it!=_parts.end();it++,iii++)
+    {
+      const MEDCoupling1GTUMesh *cur(*it);
+      if(!cur)
+        throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : a part is null !");
+      //
+      const DataArrayInt *pfl(_pfls[iii]);
+      MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> cur2;
+      if(!pfl)
+        { cur2=const_cast<MEDCoupling1GTUMesh *>(cur); cur2->incrRef(); }
+      else
+        { cur2=dynamic_cast<MEDCoupling1GTUMesh *>(cur->buildPartOfMySelfKeepCoords(pfl->begin(),pfl->end())); cur=cur2; }
+      //
+      int curNbCells(cur->getNumberOfCells());
+      szBCE+=curNbCells;
+      if((*it)->getCellModelEnum()!=INTERP_KERNEL::NORM_POLYHED)
+        szD+=cur->getNodalConnectivity()->getNumberOfTuples()+curNbCells;
+      else
+        {
+          isPolyh=true;
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp2(cur->computeEffectiveNbOfNodesPerCell());
+          szD+=tmp2->accumulate(0)+curNbCells;
+          szF+=2*curNbCells+cur->getNodalConnectivity()->getNumberOfTuples();
+        }
+    }
+  MEDCouplingAutoRefCountObjectPtr<DataArrayByte> b(DataArrayByte::New()); b->alloc(szBCE,1); char *bPtr(b->getPointer());
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> c(DataArrayInt::New()); c->alloc(szBCE,1); int *cPtr(c->getPointer());
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> d(DataArrayInt::New()); d->alloc(szD,1); int *dPtr(d->getPointer());
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> e(DataArrayInt::New()),f(DataArrayInt::New()); int *ePtr(0),*fPtr(0);
+  if(isPolyh)
+    { e->alloc(szBCE,1); ePtr=e->getPointer(); f->alloc(szF,1); fPtr=f->getPointer(); }
+  int k(0);
+  iii=0;
+  for(std::vector< MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> >::const_iterator it=_parts.begin();it!=_parts.end();it++,iii++)
+    {
+      const MEDCoupling1GTUMesh *cur(*it);
+      //
+      const DataArrayInt *pfl(_pfls[iii]);
+      MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> cur2;
+      if(!pfl)
+        { cur2=const_cast<MEDCoupling1GTUMesh *>(cur); cur2->incrRef(); }
+      else
+        { cur2=dynamic_cast<MEDCoupling1GTUMesh *>(cur->buildPartOfMySelfKeepCoords(pfl->begin(),pfl->end())); cur=cur2; }
+      //
+      int curNbCells(cur->getNumberOfCells());
+      int gt((int)cur->getCellModelEnum());
+      if(gt<0 || gt>=PARAMEDMEM_2_VTKTYPE_LGTH)
+        throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : invalid geometric type !");
+      unsigned char gtvtk(PARAMEDMEM_2_VTKTYPE[gt]);
+      if(gtvtk==255)
+        throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : no VTK type for the requested INTERP_KERNEL geometric type !");
+      std::fill(bPtr,bPtr+curNbCells,gtvtk); bPtr+=curNbCells;
+      const MEDCoupling1SGTUMesh *scur(dynamic_cast<const MEDCoupling1SGTUMesh *>(cur));
+      const MEDCoupling1DGTUMesh *dcur(dynamic_cast<const MEDCoupling1DGTUMesh *>(cur));
+      const int *connPtr(cur->getNodalConnectivity()->begin());
+      if(!scur && !dcur)
+        throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : internal error !");
+      if(scur)
+        {
+          if(cur->getCellModelEnum()!=INTERP_KERNEL::NORM_HEXA27)
+            {
+              int nnpc(scur->getNumberOfNodesPerCell());
+              for(int i=0;i<curNbCells;i++,connPtr+=nnpc)
+                {
+                  *dPtr++=nnpc;
+                  dPtr=std::copy(connPtr,connPtr+nnpc,dPtr);
+                  *cPtr++=k; k+=nnpc+1;
+                }
+            }
+          else
+            {
+              for(int i=0;i<curNbCells;i++,connPtr+=27)
+                {
+                  *dPtr++=27;
+                  for(int j=0;j<27;j++,dPtr++)
+                    *dPtr=connPtr[HEXA27_PERM_ARRAY[j]];
+                  *cPtr++=k; k+=28;
+                }
+            }
+          if(isPolyh)
+            { std::fill(ePtr,ePtr+curNbCells,-1); ePtr+=curNbCells; }
+        }
+      else
+        {
+          const int *connIPtr(dcur->getNodalConnectivityIndex()->begin());
+          if(cur->getCellModelEnum()!=INTERP_KERNEL::NORM_POLYHED)
+            {
+              for(int i=0;i<curNbCells;i++,connIPtr++)
+                {
+                  *dPtr++=connIPtr[1]-connIPtr[0];
+                  dPtr=std::copy(connPtr+connIPtr[0],connPtr+connIPtr[1],dPtr);
+                  *cPtr++=k; k+=connIPtr[1]-connIPtr[0]+1;
+                }
+            }
+          else
+            {
+              for(int i=0;i<curNbCells;i++,connIPtr++)
+                {
+                  std::set<int> s(connPtr+connIPtr[0],connPtr+connIPtr[1]); s.erase(-1);
+                  *dPtr++=(int)s.size();
+                  dPtr=std::copy(s.begin(),s.end(),dPtr);
+                  *cPtr++=k; k+=(int)s.size()+1;
+                }
+            }
+          if(isPolyh)
+            {
+              connIPtr=dcur->getNodalConnectivityIndex()->begin();
+              if(cur->getCellModelEnum()!=INTERP_KERNEL::NORM_POLYHED)
+                { std::fill(ePtr,ePtr+curNbCells,-1); ePtr+=curNbCells; }
+              else
+                {
+                  int kk(0);
+                  for(int i=0;i<curNbCells;i++,connIPtr++)
+                    {
+                      int nbFace(std::count(connPtr+connIPtr[0],connPtr+connIPtr[1],-1)+1);
+                      *fPtr++=nbFace;
+                      const int *work(connPtr+connIPtr[0]);
+                      for(int j=0;j<nbFace;j++)
+                        {
+                          const int *work2=std::find(work,connPtr+connIPtr[1],-1);
+                          *fPtr++=std::distance(work,work2);
+                          fPtr=std::copy(work,work2,fPtr);
+                          work=work2+1;
+                        }
+                      *ePtr++=kk; kk+=connIPtr[1]-connIPtr[0]+2;
+                    }
+                }
+            }
+        }
+    }
+  if(!isPolyh)
+    reorderNodesIfNecessary(a,d,0);
+  else
+    reorderNodesIfNecessary(a,d,f);
+  if(a->getNumberOfComponents()!=3)
+    a=a->changeNbOfComponents(3,0.);
+  coords=a.retn(); types=b.retn(); cellLocations=c.retn(); cells=d.retn();
+  if(!isPolyh)
+    { faceLocations=0; faces=0; }
+  else
+    { faceLocations=e.retn(); faces=f.retn(); }
+  return _mesh->isObjectInTheProgeny(coords);
+}
+
+void MEDUMeshMultiLev::reorderNodesIfNecessary(MEDCouplingAutoRefCountObjectPtr<DataArrayDouble>& coords, DataArrayInt *nodalConnVTK, DataArrayInt *polyhedNodalConnVTK) const
+{
+  const DataArrayInt *nr(_node_reduction);
+  if(!nr)
+    return ;
+  if(nodalConnVTK->empty() && !polyhedNodalConnVTK)
+    {
+      coords=(coords->selectByTupleIdSafe(nr->begin(),nr->end()));
+      return ;
+    }
+  int sz(coords->getNumberOfTuples());
+  std::vector<bool> b(sz,false);
+  const int *work(nodalConnVTK->begin()),*endW(nodalConnVTK->end());
+  while(work!=endW)
+    {
+      int nb(*work++);
+      for(int i=0;i<nb && work!=endW;i++,work++)
+        {
+          if(*work>=0 && *work<sz)
+            b[*work]=true;
+          else
+            throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::reorderNodesIfNecessary : internal error !");
+        }
+    }
+  if(polyhedNodalConnVTK)
+    {
+      work=polyhedNodalConnVTK->begin(); endW=polyhedNodalConnVTK->end();
+      while(work!=endW)
+        {
+          int nb(*work++);
+          for(int i=0;i<nb && work!=endW;i++)
+            {
+              int nb2(*work++);
+              for(int j=0;j<nb2 && work!=endW;j++,work++)
+                {
+                  if(*work>=0 && *work<sz)
+                    b[*work]=true;
+                  else
+                    throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::reorderNodesIfNecessary : internal error #2 !");
+                }
+            }
+        }
+    }
+  int szExp(std::count(b.begin(),b.end(),true));
+  if(szExp!=nr->getNumberOfTuples())
+    throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::reorderNodesIfNecessary : internal error #3 !");
+  // Go renumbering !
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> o2n(DataArrayInt::New()); o2n->alloc(sz,1);
+  int *o2nPtr(o2n->getPointer());
+  int newId(0);
+  for(int i=0;i<sz;i++,o2nPtr++)
+    if(b[i]) *o2nPtr=newId++; else *o2nPtr=-1;
+  const int *o2nPtrc(o2n->begin());
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> n2o(o2n->invertArrayO2N2N2O(nr->getNumberOfTuples()));
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> perm(DataArrayInt::FindPermutationFromFirstToSecond(n2o,nr));
+  const int *permPtr(perm->begin());
+  int *work2(nodalConnVTK->getPointer()),*endW2(nodalConnVTK->getPointer()+nodalConnVTK->getNumberOfTuples());
+  while(work2!=endW2)
+    {
+      int nb(*work2++);
+      for(int i=0;i<nb && work2!=endW2;i++,work2++)
+        *work2=permPtr[o2nPtrc[*work2]];
+    }
+  if(polyhedNodalConnVTK)
+    {
+      work2=polyhedNodalConnVTK->getPointer(); endW2=polyhedNodalConnVTK->getPointer()+polyhedNodalConnVTK->getNumberOfTuples();
+      while(work2!=endW2)
+        {
+          int nb(*work2++);
+          for(int i=0;i<nb && work2!=endW2;i++)
+            {
+              int nb2(*work2++);
+              for(int j=0;j<nb2 && work2!=endW2;j++,work2++)
+                *work2=permPtr[o2nPtrc[*work2]];
+            }
+        }
+    }
+  coords=(coords->selectByTupleIdSafe(nr->begin(),nr->end()));
+}
+
+
+void MEDUMeshMultiLev::appendVertices(const DataArrayInt *verticesToAdd, DataArrayInt *nr)
+{
+  int nbOfCells(verticesToAdd->getNumberOfTuples());//it is not a bug cells are NORM_POINT1
+  MEDMeshMultiLev::appendVertices(verticesToAdd,nr);
+  MEDCouplingAutoRefCountObjectPtr<MEDCoupling1SGTUMesh> elt(MEDCoupling1SGTUMesh::New("",INTERP_KERNEL::NORM_POINT1));
+  elt->allocateCells(nbOfCells);
+  for(int i=0;i<nbOfCells;i++)
+    {
+      int pt(verticesToAdd->getIJ(i,0));
+      elt->insertNextCell(&pt,&pt+1);
+    }
+  if(_parts.empty())
+    throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::appendVertices : parts are empty !");
+  elt->setCoords(_parts[0]->getCoords());
+  MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> elt2((MEDCoupling1SGTUMesh *)elt); elt2->incrRef();
+  _parts.push_back(elt2);
+}
+
+//=
+
+MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const MEDFileStructuredMesh *m, const std::vector<int>& lev):MEDMeshMultiLev(m),_is_internal(true)
+{
+  initStdFieldOfIntegers(m);
+}
+
+MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const MEDFileStructuredMesh *m, int nbOfNodes, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDMeshMultiLev(m,nbOfNodes,gts,pfls,nbEntities),_is_internal(true)
+{
+  initStdFieldOfIntegers(m);
+}
+
+MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const MEDStructuredMeshMultiLev& other):MEDMeshMultiLev(other),_is_internal(true),_face_fam_ids(other._face_fam_ids),_face_num_ids(other._face_num_ids)
+{
+}
+
+void MEDStructuredMeshMultiLev::initStdFieldOfIntegers(const MEDFileStructuredMesh *m)
+{
+  // ids fields management
+  const DataArrayInt *tmp(0);
+  tmp=m->getFamilyFieldAtLevel(0);
+  if(tmp)
+    {
+      tmp->incrRef();
+      _cell_fam_ids=const_cast<DataArrayInt *>(tmp);
+    }
+  tmp=m->getNumberFieldAtLevel(0);
+  if(tmp)
+    {
+      tmp->incrRef();
+      _cell_num_ids=const_cast<DataArrayInt *>(tmp);
+    }
+  //
+  tmp=0;
+  tmp=m->getFamilyFieldAtLevel(1);
+  if(tmp)
+    {
+      tmp->incrRef();
+      _node_fam_ids=const_cast<DataArrayInt *>(tmp);
+    }
+  tmp=m->getNumberFieldAtLevel(1);
+  if(tmp)
+    {
+      tmp->incrRef();
+      _node_num_ids=const_cast<DataArrayInt *>(tmp);
+    }
+  // faces (if any)
+  tmp=m->getFamilyFieldAtLevel(-1);
+  if(tmp)
+    {
+      tmp->incrRef();
+      _face_fam_ids=const_cast<DataArrayInt *>(tmp);
+    }
+  tmp=m->getNumberFieldAtLevel(-1);
+  if(tmp)
+    {
+      tmp->incrRef();
+      _face_num_ids=const_cast<DataArrayInt *>(tmp);
+    }
+}
+
+void MEDStructuredMeshMultiLev::moveFaceToCell() const
+{
+  const_cast<MEDStructuredMeshMultiLev *>(this)->_cell_fam_ids=_face_fam_ids; const_cast<MEDStructuredMeshMultiLev *>(this)->_face_fam_ids=0;
+  const_cast<MEDStructuredMeshMultiLev *>(this)->_cell_num_ids=_face_num_ids; const_cast<MEDStructuredMeshMultiLev *>(this)->_face_num_ids=0;
+}
+
+bool MEDStructuredMeshMultiLev::prepareForImplicitUnstructuredMeshCase(MEDMeshMultiLev *&ret) const
+{
+  ret=0;
+  if(_geo_types.empty())
+    return false;
+  if(_geo_types.size()!=1)
+    throw INTERP_KERNEL::Exception("MEDStructuredMeshMultiLev::prepareForImplicitUnstructuredMeshCase only one geo types supported at most supported for the moment !");
+  INTERP_KERNEL::NormalizedCellType gt(MEDCouplingStructuredMesh::GetGeoTypeGivenMeshDimension(_mesh->getMeshDimension()));
+  if(_geo_types[0]==gt)
+    return false;
+  MEDCoupling1GTUMesh *facesIfPresent((static_cast<const MEDFileStructuredMesh *>(_mesh))->getImplicitFaceMesh());
+  if(!facesIfPresent)
+    return false;
+  const DataArrayInt *pfl(0),*nr(_node_reduction);
+  if(!_pfls.empty())
+    pfl=_pfls[0];
+  MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> facesIfPresent2(facesIfPresent); facesIfPresent->incrRef();
+  moveFaceToCell();
+  MEDCouplingAutoRefCountObjectPtr<MEDUMeshMultiLev> ret2(new MEDUMeshMultiLev(*this,facesIfPresent2));
+  if(pfl)
+    ret2->setCellReduction(pfl);
+  if(nr)
+    throw INTERP_KERNEL::Exception("MEDStructuredMeshMultiLev::prepareForImplicitUnstructuredMeshCase : case is not treated yet for node reduction on implicit unstructured mesh.");
+  ret=ret2.retn();
+  return true;
+}
+
+void MEDStructuredMeshMultiLev::dealWithImplicitUnstructuredMesh(const MEDFileMesh *m)
+{
+  const DataArrayInt *tmp(0);
+  tmp=m->getFamilyFieldAtLevel(-1);
+  if(tmp)
+    {
+      tmp->incrRef();
+      _cell_fam_ids=const_cast<DataArrayInt *>(tmp);
+    }
+  tmp=m->getNumberFieldAtLevel(-1);
+  if(tmp)
+    {
+      tmp->incrRef();
+      _cell_num_ids=const_cast<DataArrayInt *>(tmp);
+    }
+}
+
+void MEDStructuredMeshMultiLev::selectPartOfNodes(const DataArrayInt *pflNodes)
+{
+  if(!pflNodes || !pflNodes->isAllocated())
+    return ;
+  std::vector<int> ngs(getNodeGridStructure());
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> conn(MEDCouplingStructuredMesh::Build1GTNodalConnectivity(&ngs[0],&ngs[0]+ngs.size()));
+  MEDCouplingAutoRefCountObjectPtr<MEDCoupling1SGTUMesh> m(MEDCoupling1SGTUMesh::New("",MEDCouplingStructuredMesh::GetGeoTypeGivenMeshDimension(ngs.size())));
+  m->setNodalConnectivity(conn);
+  const DataArrayInt *pfl(_pfls[0]);
+  if(pfl)
+    {
+      m=dynamic_cast<MEDCoupling1SGTUMesh *>(m->buildPartOfMySelfKeepCoords(pfl->begin(),pfl->end()));
+    }
+  DataArrayInt *cellIds=0;
+  m->fillCellIdsToKeepFromNodeIds(pflNodes->begin(),pflNodes->end(),true,cellIds);
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> cellIdsSafe(cellIds);
+  MEDCouplingAutoRefCountObjectPtr<MEDCouplingPointSet> m2(m->buildPartOfMySelfKeepCoords(cellIds->begin(),cellIds->end()));
+  int tmp=-1;
+  _node_reduction=m2->getNodeIdsInUse(tmp);
+  if(pfl)
+    _pfls[0]=pfl->selectByTupleIdSafe(cellIds->begin(),cellIds->end());
+  else
+    _pfls[0]=cellIdsSafe;
+}
+
+//=
+
+MEDCMeshMultiLev *MEDCMeshMultiLev::New(const MEDFileCMesh *m, const std::vector<int>& levs)
+{
+  return new MEDCMeshMultiLev(m,levs);
+}
+
+MEDCMeshMultiLev *MEDCMeshMultiLev::New(const MEDFileCMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities)
+{
+  return new MEDCMeshMultiLev(m,gts,pfls,nbEntities);
+}
+
+MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDFileCMesh *m, const std::vector<int>& levs):MEDStructuredMeshMultiLev(m,levs)
+{
+  if(!m)
+    throw INTERP_KERNEL::Exception("MEDCMeshMultiLev constructor : null input pointer !");
+  if(levs.size()!=1 || levs[0]!=0)
+    throw INTERP_KERNEL::Exception("MEDCMeshMultiLev constructor : levels supported is 0 only !");
+  int sdim(m->getSpaceDimension());
+  _coords.resize(sdim);
+  for(int i=0;i<sdim;i++)
+    {
+      DataArrayDouble *elt(const_cast<DataArrayDouble *>(m->getMesh()->getCoordsAt(i)));
+      if(!elt)
+        throw INTERP_KERNEL::Exception("MEDCMeshMultiLev constructor 2 : presence of null pointer for an vector of double along an axis !");
+      elt->incrRef();
+      _coords[i]=elt;
+    }
+}
+
+MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDFileCMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDStructuredMeshMultiLev(m,m->getNumberOfNodes(),gts,pfls,nbEntities)
+{
+  if(!m)
+    throw INTERP_KERNEL::Exception("MEDCMeshMultiLev constructor 2 : null input pointer !");
+  if(gts.size()!=1 || pfls.size()!=1)
+    throw INTERP_KERNEL::Exception("MEDCMeshMultiLev constructor 2 : lengthes of gts and pfls must be equal to one !");
+  int mdim(m->getMeshDimension());
+  INTERP_KERNEL::NormalizedCellType gt(MEDCouplingStructuredMesh::GetGeoTypeGivenMeshDimension(mdim));
+  if(gt==gts[0])
+    {
+      _coords.resize(mdim);
+      for(int i=0;i<mdim;i++)
+        {
+          DataArrayDouble *elt(const_cast<DataArrayDouble *>(m->getMesh()->getCoordsAt(i)));
+          if(!elt)
+            throw INTERP_KERNEL::Exception("MEDCMeshMultiLev constructor 2 : presence of null pointer for an vector of double along an axis !");
+          _coords[i]=elt; _coords[i]->incrRef();
+        }
+    }
+  else
+    dealWithImplicitUnstructuredMesh(m);
+}
+
+MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDCMeshMultiLev& other):MEDStructuredMeshMultiLev(other),_coords(other._coords)
+{
+}
+
+std::vector<int> MEDCMeshMultiLev::getNodeGridStructure() const
+{
+  std::vector<int> ret(_coords.size());
+  for(std::size_t i=0;i<_coords.size();i++)
+    ret[i]=_coords[i]->getNumberOfTuples();
+  return ret;
+}
+
+MEDMeshMultiLev *MEDCMeshMultiLev::prepare() const
+{
+  MEDMeshMultiLev *retSpecific(0);
+  if(prepareForImplicitUnstructuredMeshCase(retSpecific))
+    return retSpecific;
+  const DataArrayInt *pfl(0),*nr(_node_reduction);
+  if(!_pfls.empty())
+    pfl=_pfls[0];
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> nnr;
+  std::vector<int> cgs,ngs(getNodeGridStructure());
+  cgs.resize(ngs.size());
+  std::transform(ngs.begin(),ngs.end(),cgs.begin(),std::bind2nd(std::plus<int>(),-1));
+  if(pfl)
+    {
+      std::vector< std::pair<int,int> > cellParts;
+      MEDCouplingAutoRefCountObjectPtr<MEDMeshMultiLev> ret2;
+      if(MEDCouplingStructuredMesh::IsPartStructured(pfl->begin(),pfl->end(),cgs,cellParts))
+        {
+          MEDCouplingAutoRefCountObjectPtr<MEDCMeshMultiLev> ret(new MEDCMeshMultiLev(*this));
+          ret->_is_internal=false;
+          if(nr)
+            { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+          ret->_nb_entities[0]=pfl->getNumberOfTuples();
+          ret->_pfls[0]=0;
+          std::vector< MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> > coords(_coords.size());
+          for(std::size_t i=0;i<_coords.size();i++)
+            coords[i]=_coords[i]->selectByTupleId2(cellParts[i].first,cellParts[i].second+1,1);
+          ret->_coords=coords;
+          ret2=(MEDCMeshMultiLev *)ret; ret2->incrRef();
+        }
+      else
+        {
+          MEDCouplingAutoRefCountObjectPtr<MEDCouplingCMesh> m(MEDCouplingCMesh::New());
+          for(std::size_t i=0;i<ngs.size();i++)
+            m->setCoordsAt(i,_coords[i]);
+          MEDCouplingAutoRefCountObjectPtr<MEDCoupling1SGTUMesh> m2(m->build1SGTUnstructured());
+          MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> m3=dynamic_cast<MEDCoupling1GTUMesh *>(m2->buildPartOfMySelfKeepCoords(pfl->begin(),pfl->end()));
+          MEDCouplingAutoRefCountObjectPtr<MEDUMeshMultiLev> ret(new MEDUMeshMultiLev(*this,m3));
+          if(nr)
+            { m3->zipCoords(); nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+          ret2=(MEDUMeshMultiLev *)ret; ret2->incrRef();
+        }
+      const DataArrayInt *famIds(_cell_fam_ids),*numIds(_cell_num_ids);
+      if(famIds)
+        {
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp(famIds->selectByTupleIdSafe(pfl->begin(),pfl->end()));
+          ret2->setFamilyIdsOnCells(tmp);
+        }
+      if(numIds)
+        {
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp(numIds->selectByTupleIdSafe(pfl->begin(),pfl->end()));
+          ret2->setNumberIdsOnCells(tmp);
+        }
+      return ret2.retn();
+
+    }
+  else
+    {
+      MEDCouplingAutoRefCountObjectPtr<MEDCMeshMultiLev> ret(new MEDCMeshMultiLev(*this));
+      if(nr)
+        { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+      return ret.retn();
+    }
+}
+
+/*!
+ * \a param [out] isInternal if true the returned pointers are those in main data structure. If false those pointers have been built espacially for that method.
+ */
+std::vector< DataArrayDouble * > MEDCMeshMultiLev::buildVTUArrays(bool& isInternal) const
+{
+  isInternal=_is_internal;
+  std::size_t sz(_coords.size());
+  std::vector< DataArrayDouble * > ret(sz);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      ret[i]=const_cast<DataArrayDouble *>((const DataArrayDouble *)_coords[i]);
+      ret[i]->incrRef();
+    }
+  return ret;
+}
+
+//=
+
+MEDCurveLinearMeshMultiLev *MEDCurveLinearMeshMultiLev::New(const MEDFileCurveLinearMesh *m, const std::vector<int>& levs)
+{
+  return new MEDCurveLinearMeshMultiLev(m,levs);
+}
+
+MEDCurveLinearMeshMultiLev *MEDCurveLinearMeshMultiLev::New(const MEDFileCurveLinearMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities)
+{
+  return new MEDCurveLinearMeshMultiLev(m,gts,pfls,nbEntities);
+}
+
+MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDFileCurveLinearMesh *m, const std::vector<int>& levs):MEDStructuredMeshMultiLev(m,levs)
+{
+  if(!m)
+    throw INTERP_KERNEL::Exception("MEDCurveLinearMeshMultiLev constructor : null input pointer !");
+  if(levs.size()!=1 || levs[0]!=0)
+    throw INTERP_KERNEL::Exception("MEDCurveLinearMeshMultiLev constructor : levels supported is 0 only !");
+  DataArrayDouble *coords(const_cast<DataArrayDouble *>(m->getMesh()->getCoords()));
+  if(!coords)
+    throw INTERP_KERNEL::Exception("MEDCurveLinearMeshMultiLev constructor 2 : no coords set !");
+  coords->incrRef();
+  _coords=coords;
+  _structure=m->getMesh()->getNodeGridStructure();
+}
+
+MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDFileCurveLinearMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDStructuredMeshMultiLev(m,m->getNumberOfNodes(),gts,pfls,nbEntities)
+{
+  if(!m)
+    throw INTERP_KERNEL::Exception("MEDCurveLinearMeshMultiLev constructor 2 : null input pointer !");
+  if(gts.size()!=1 || pfls.size()!=1)
+    throw INTERP_KERNEL::Exception("MEDCurveLinearMeshMultiLev constructor 2 : lengthes of gts and pfls must be equal to one !");
+  INTERP_KERNEL::NormalizedCellType gt(MEDCouplingStructuredMesh::GetGeoTypeGivenMeshDimension(m->getMeshDimension()));
+  if(gt==gts[0])
+    {
+      DataArrayDouble *coords(const_cast<DataArrayDouble *>(m->getMesh()->getCoords()));
+      if(!coords)
+        throw INTERP_KERNEL::Exception("MEDCurveLinearMeshMultiLev constructor 2 : no coords set !");
+      coords->incrRef();
+      _coords=coords;
+      _structure=m->getMesh()->getNodeGridStructure();
+    }
+  else
+    dealWithImplicitUnstructuredMesh(m);
+}
+
+MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDCurveLinearMeshMultiLev& other):MEDStructuredMeshMultiLev(other),_coords(other._coords),_structure(other._structure)
+{
+}
+
+std::vector<int> MEDCurveLinearMeshMultiLev::getNodeGridStructure() const
+{
+  return _structure;
+}
+
+MEDMeshMultiLev *MEDCurveLinearMeshMultiLev::prepare() const
+{
+  MEDMeshMultiLev *retSpecific(0);
+  if(prepareForImplicitUnstructuredMeshCase(retSpecific))
+    return retSpecific;
+  const DataArrayInt *pfl(0),*nr(_node_reduction);
+  if(!_pfls.empty())
+    pfl=_pfls[0];
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> nnr;
+  std::vector<int> cgs,ngs(getNodeGridStructure());
+  cgs.resize(ngs.size());
+  std::transform(ngs.begin(),ngs.end(),cgs.begin(),std::bind2nd(std::plus<int>(),-1));
+  if(pfl)
+    {
+      std::vector< std::pair<int,int> > cellParts,nodeParts;
+      MEDCouplingAutoRefCountObjectPtr<MEDMeshMultiLev> ret2;
+      if(MEDCouplingStructuredMesh::IsPartStructured(pfl->begin(),pfl->end(),cgs,cellParts))
+        {
+          nodeParts=cellParts;
+          std::vector<int> st(ngs.size());
+          for(std::size_t i=0;i<ngs.size();i++)
+            {
+              nodeParts[i].second++;
+              st[i]=nodeParts[i].second-nodeParts[i].first;
+            }
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p(MEDCouplingStructuredMesh::BuildExplicitIdsFrom(ngs,nodeParts));
+          MEDCouplingAutoRefCountObjectPtr<MEDCurveLinearMeshMultiLev> ret(new MEDCurveLinearMeshMultiLev(*this));
+          ret->_is_internal=false;
+          if(nr)
+            { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+          ret->_nb_entities[0]=pfl->getNumberOfTuples();
+          ret->_pfls[0]=0;
+          ret->_coords=_coords->selectByTupleIdSafe(p->begin(),p->end());
+          ret->_structure=st;
+          ret2=(MEDCurveLinearMeshMultiLev *)ret; ret2->incrRef();
+        }
+      else
+        {
+          MEDCouplingAutoRefCountObjectPtr<MEDCouplingCurveLinearMesh> m(MEDCouplingCurveLinearMesh::New());
+          m->setCoords(_coords); m->setNodeGridStructure(&_structure[0],&_structure[0]+_structure.size());
+          MEDCouplingAutoRefCountObjectPtr<MEDCoupling1SGTUMesh> m2(m->build1SGTUnstructured());
+          MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> m3=dynamic_cast<MEDCoupling1GTUMesh *>(m2->buildPartOfMySelfKeepCoords(pfl->begin(),pfl->end()));
+          MEDCouplingAutoRefCountObjectPtr<MEDUMeshMultiLev> ret(new MEDUMeshMultiLev(*this,m3));
+          if(nr)
+            { m3->zipCoords(); nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+          ret2=(MEDUMeshMultiLev *)ret; ret2->incrRef();
+        }
+      const DataArrayInt *famIds(_cell_fam_ids),*numIds(_cell_num_ids);
+      if(famIds)
+        {
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp(famIds->selectByTupleIdSafe(pfl->begin(),pfl->end()));
+          ret2->setFamilyIdsOnCells(tmp);
+        }
+      if(numIds)
+        {
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp(numIds->selectByTupleIdSafe(pfl->begin(),pfl->end()));
+          ret2->setNumberIdsOnCells(tmp);
+        }
+      return ret2.retn();
+    }
+  else
+    {
+      MEDCouplingAutoRefCountObjectPtr<MEDCurveLinearMeshMultiLev> ret(new MEDCurveLinearMeshMultiLev(*this));
+      if(nr)
+        { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+      return ret.retn();
+    }
 }
 
-int MEDFileMeshStruct::getNumberOfGeoTypesInLev(int relativeLev) const throw(INTERP_KERNEL::Exception)
+void MEDCurveLinearMeshMultiLev::buildVTUArrays(DataArrayDouble *&coords, std::vector<int>& nodeStrct, bool& isInternal) const
 {
-  int pos(-relativeLev);
-  if(pos<0 || pos>=_geo_types_distrib.size())
-    throw INTERP_KERNEL::Exception("MEDFileMeshStruct::getNumberOfGeoTypesInLev : invalid level specified !");
-  std::size_t sz=_geo_types_distrib[pos].size();
-  if(sz%3!=0)
-    throw INTERP_KERNEL::Exception("MEDFileMeshStruct::getNumberOfGeoTypesInLev : internal error in code !");
-  return (int)(sz/3);
+  isInternal=_is_internal;
+  nodeStrct=_structure;
+  const DataArrayDouble *coo(_coords);
+  if(!coo)
+    throw INTERP_KERNEL::Exception("MEDCurveLinearMeshMultiLev::buildVTUArrays : null pointer on coordinates !");
+  coords=const_cast<DataArrayDouble *>(coo); coords->incrRef();
 }
 
 //=
@@ -107,20 +1591,25 @@ MEDFileField1TSStructItem2::MEDFileField1TSStructItem2(INTERP_KERNEL::Normalized
   _pfl->setName(c.c_str());
 }
 
-void MEDFileField1TSStructItem2::checkWithMeshStructForCells(MEDFileMeshStruct *mst, const MEDFileFieldGlobs *globs) throw(INTERP_KERNEL::Exception)
+void MEDFileField1TSStructItem2::checkWithMeshStructForCells(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs)
 {
+  if(!mst->doesManageGeoType(_geo_type))
+    {
+      MEDFileMeshStruct *mstUnConstCasted(const_cast<MEDFileMeshStruct *>(mst));
+      mstUnConstCasted->appendIfImplicitType(_geo_type);
+    }
   int nbOfEnt=mst->getNumberOfElemsOfGeoType(_geo_type);
   checkInRange(nbOfEnt,1,globs);
 }
 
-void MEDFileField1TSStructItem2::checkWithMeshStructForGaussNE(MEDFileMeshStruct *mst, const MEDFileFieldGlobs *globs) throw(INTERP_KERNEL::Exception)
+void MEDFileField1TSStructItem2::checkWithMeshStructForGaussNE(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs)
 {
   int nbOfEnt=mst->getNumberOfElemsOfGeoType(_geo_type);
   const INTERP_KERNEL::CellModel& cm=INTERP_KERNEL::CellModel::GetCellModel(_geo_type);
   checkInRange(nbOfEnt,(int)cm.getNumberOfNodes(),globs);
 }
 
-void MEDFileField1TSStructItem2::checkWithMeshStructForGaussPT(MEDFileMeshStruct *mst, const MEDFileFieldGlobs *globs) throw(INTERP_KERNEL::Exception)
+void MEDFileField1TSStructItem2::checkWithMeshStructForGaussPT(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs)
 {
   if(!globs)
     throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::checkWithMeshStructForGaussPT : no globals specified !");
@@ -131,16 +1620,45 @@ void MEDFileField1TSStructItem2::checkWithMeshStructForGaussPT(MEDFileMeshStruct
   checkInRange(nbOfEnt,loc.getNumberOfGaussPoints(),globs);
 }
 
+int MEDFileField1TSStructItem2::getNbOfIntegrationPts(const MEDFileFieldGlobsReal *globs) const
+{
+  if(_loc.empty())
+    {
+      if(getPflName().empty())
+        return (_start_end.second-_start_end.first)/_nb_of_entity;
+      else
+        return (_start_end.second-_start_end.first)/getPfl(globs)->getNumberOfTuples();
+    }
+  else
+    {
+      const MEDFileFieldLoc& loc(globs->getLocalization(_loc.c_str()));
+      return loc.getNumberOfGaussPoints();
+    }
+}
+
 std::string MEDFileField1TSStructItem2::getPflName() const
 {
   return _pfl->getName();
 }
 
+const DataArrayInt *MEDFileField1TSStructItem2::getPfl(const MEDFileFieldGlobsReal *globs) const
+{
+  if(!_pfl->isAllocated())
+    {
+      if(_pfl->getName().empty())
+        return 0;
+      else
+        return globs->getProfile(_pfl->getName().c_str());
+    }
+  else
+    return _pfl;
+}
+
 /*!
  * \param [in] nbOfEntity - number of entity that can be either cells or nodes. Not other possiblity.
  * \param [in] nip - number of integration points. 1 for ON_CELLS and NO_NODES
  */
-void MEDFileField1TSStructItem2::checkInRange(int nbOfEntity, int nip, const MEDFileFieldGlobs *globs) throw(INTERP_KERNEL::Exception)
+void MEDFileField1TSStructItem2::checkInRange(int nbOfEntity, int nip, const MEDFileFieldGlobsReal *globs)
 {
   _nb_of_entity=nbOfEntity;
   if(_pfl->getName().empty())
@@ -156,17 +1674,30 @@ void MEDFileField1TSStructItem2::checkInRange(int nbOfEntity, int nip, const MED
       const DataArrayInt *pfl=globs->getProfile(_pfl->getName().c_str());
       if(!pfl)
         throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::checkInRange : Presence of a profile on field whereas no such profile found in file !");
-      if(!pfl->checkAllIdsInRange(0,nbOfEntity))
-        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::checkInRange : The profile specified is invalid !");
+      pfl->checkAllIdsInRange(0,nbOfEntity);
     }
 }
 
-bool MEDFileField1TSStructItem2::operator==(const MEDFileField1TSStructItem2& other) const throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStructItem2::isFastlyEqual(int& startExp, INTERP_KERNEL::NormalizedCellType gt, const std::string& pflName) const
+{
+  if(startExp!=_start_end.first)
+    return false;
+  if(gt!=_geo_type)
+    return false;
+  if(getPflName()!=pflName)
+    return false;
+  startExp=_start_end.second;
+  return true;
+}
+
+bool MEDFileField1TSStructItem2::operator==(const MEDFileField1TSStructItem2& other) const
 {
+  //_nb_of_entity is not taken into account here. It is not a bug, because no mesh consideration needed here to perform fast compare.
+  //idem for _loc. It is not an effective attribute for support comparison.
   return _geo_type==other._geo_type && _start_end==other._start_end && _pfl->getName()==other._pfl->getName();
 }
 
-bool MEDFileField1TSStructItem2::isCellSupportEqual(const MEDFileField1TSStructItem2& other) const throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStructItem2::isCellSupportEqual(const MEDFileField1TSStructItem2& other, const MEDFileFieldGlobsReal *globs) const
 {
   if(_geo_type!=other._geo_type)
     return false;
@@ -176,13 +1707,19 @@ bool MEDFileField1TSStructItem2::isCellSupportEqual(const MEDFileField1TSStructI
     return false;
   if(_pfl->getName().empty() && other._pfl->getName().empty())
     return true;
-  return _pfl->isEqualWithoutConsideringStr(*other._pfl);
+  const DataArrayInt *pfl1(getPfl(globs)),*pfl2(other.getPfl(globs));
+  return pfl1->isEqualWithoutConsideringStr(*pfl2);
+}
+
+bool MEDFileField1TSStructItem2::isNodeSupportEqual(const MEDFileField1TSStructItem2& other, const MEDFileFieldGlobsReal *globs) const
+{
+  return isCellSupportEqual(other,globs);
 }
 
 /*!
  * \a objs must be non empty. \a objs should contain items having same geometric type.
  */
-MEDFileField1TSStructItem2 MEDFileField1TSStructItem2::BuildAggregationOf(const std::vector<const MEDFileField1TSStructItem2 *>& objs, const MEDFileFieldGlobs *globs) throw(INTERP_KERNEL::Exception)
+MEDFileField1TSStructItem2 MEDFileField1TSStructItem2::BuildAggregationOf(const std::vector<const MEDFileField1TSStructItem2 *>& objs, const MEDFileFieldGlobsReal *globs)
 {
   if(objs.empty())
     throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::BuildAggregationOf : empty input !");
@@ -202,31 +1739,44 @@ MEDFileField1TSStructItem2 MEDFileField1TSStructItem2::BuildAggregationOf(const
       if(obj->_pfl->getName().empty())
         throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::BuildAggregationOf : invalid situation ! Several same geo type chunk must all lie on profiles !");
       arrs[i]=globs->getProfile(obj->_pfl->getName().c_str());
-      MEDCouplingAutoRefCountObjectPtr<DataArrayInt> arr(DataArrayInt::Aggregate(arrs));
-      arr->sort();
-      int oldNbTuples(arr->getNumberOfTuples());
-      arr=arr->buildUnique();
-      if(oldNbTuples!=arr->getNumberOfTuples())
-        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::BuildAggregationOf : some entities are present several times !");
-      if(arr->isIdentity() && oldNbTuples==nbEntityRef)
-        {
-          std::pair<int,int> p(0,nbEntityRef);
-          std::string a,b;
-          MEDFileField1TSStructItem2 ret(gt,p,a,b);
-          ret._nb_of_entity=nbEntityRef;
-          return ret;
-        }
-      else
-        {
-          arr->setName("???");
-          std::pair<int,int> p(0,oldNbTuples);
-          std::string a,b;
-          MEDFileField1TSStructItem2 ret(gt,p,a,b);
-          ret._nb_of_entity=nbEntityRef;
-          ret._pfl=arr;
-          return ret;
-        }
     }
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> arr(DataArrayInt::Aggregate(arrs));
+  arr->sort();
+  int oldNbTuples(arr->getNumberOfTuples());
+  arr=arr->buildUnique();
+  if(oldNbTuples!=arr->getNumberOfTuples())
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::BuildAggregationOf : some entities are present several times !");
+  if(arr->isIdentity() && oldNbTuples==nbEntityRef)
+    {
+      std::pair<int,int> p(0,nbEntityRef);
+      std::string a,b;
+      MEDFileField1TSStructItem2 ret(gt,p,a,b);
+      ret._nb_of_entity=nbEntityRef;
+      return ret;
+    }
+  else
+    {
+      arr->setName(arrs[0]->getName());
+      std::pair<int,int> p(0,oldNbTuples);
+      std::string a,b;
+      MEDFileField1TSStructItem2 ret(gt,p,a,b);
+      ret._nb_of_entity=nbEntityRef;
+      ret._pfl=arr;
+      return ret;
+    }
+}
+
+std::size_t MEDFileField1TSStructItem2::getHeapMemorySizeWithoutChildren() const
+{
+  std::size_t ret(_loc.capacity());
+  return ret;
+}
+
+std::vector<const BigMemoryObject *> MEDFileField1TSStructItem2::getDirectChildrenWithNull() const
+{
+  std::vector<const BigMemoryObject *> ret;
+  ret.push_back((const DataArrayInt *)_pfl);
+  return ret;
 }
 
 //=
@@ -235,10 +1785,10 @@ MEDFileField1TSStructItem::MEDFileField1TSStructItem(TypeOfField a, const std::v
 {
 }
 
-void MEDFileField1TSStructItem::checkWithMeshStruct(MEDFileMeshStruct *mst, const MEDFileFieldGlobs *globs) throw(INTERP_KERNEL::Exception)
+void MEDFileField1TSStructItem::checkWithMeshStruct(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs)
 {
   switch(_type)
-    {
+  {
     case ON_NODES:
       {
         int nbOfEnt=mst->getNumberOfNodes();
@@ -267,10 +1817,10 @@ void MEDFileField1TSStructItem::checkWithMeshStruct(MEDFileMeshStruct *mst, cons
       }
     default:
       throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::checkWithMeshStruct : not managed field type !");
-    }
+  }
 }
 
-bool MEDFileField1TSStructItem::operator==(const MEDFileField1TSStructItem& other) const throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStructItem::operator==(const MEDFileField1TSStructItem& other) const
 {
   if(_type!=other._type)
     return false;
@@ -282,14 +1832,26 @@ bool MEDFileField1TSStructItem::operator==(const MEDFileField1TSStructItem& othe
   return true;
 }
 
-bool MEDFileField1TSStructItem::isCellSupportEqual(const MEDFileField1TSStructItem& other) const throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStructItem::isCellSupportEqual(const MEDFileField1TSStructItem& other, const MEDFileFieldGlobsReal *globs) const
+{
+  if(_type!=other._type)
+    return false;
+  if(_items.size()!=other._items.size())
+    return false;
+  for(std::size_t i=0;i<_items.size();i++)
+    if(!(_items[i].isCellSupportEqual(other._items[i],globs)))
+      return false;
+  return true;
+}
+
+bool MEDFileField1TSStructItem::isNodeSupportEqual(const MEDFileField1TSStructItem& other, const MEDFileFieldGlobsReal *globs) const
 {
   if(_type!=other._type)
     return false;
   if(_items.size()!=other._items.size())
     return false;
   for(std::size_t i=0;i<_items.size();i++)
-    if(!(_items[i].isCellSupportEqual(other._items[i])))
+    if(!(_items[i].isNodeSupportEqual(other._items[i],globs)))
       return false;
   return true;
 }
@@ -311,7 +1873,7 @@ private:
   INTERP_KERNEL::NormalizedCellType _geo_type;
 };
 
-MEDFileField1TSStructItem MEDFileField1TSStructItem::simplifyMeOnCellEntity(const MEDFileFieldGlobs *globs) const throw(INTERP_KERNEL::Exception)
+MEDFileField1TSStructItem MEDFileField1TSStructItem::simplifyMeOnCellEntity(const MEDFileFieldGlobsReal *globs) const
 {
   if(!isEntityCell())
     throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::simplifyMeOnCellEntity : must be on ON_CELLS, ON_GAUSS_NE or ON_GAUSS_PT !");
@@ -322,7 +1884,8 @@ MEDFileField1TSStructItem MEDFileField1TSStructItem::simplifyMeOnCellEntity(cons
       std::vector< std::pair< INTERP_KERNEL::NormalizedCellType, std::vector<std::size_t> > >::iterator it0(std::find_if(m.begin(),m.end(),CmpGeo((*it).getGeo())));
       if(it0==m.end())
         m.push_back(std::pair< INTERP_KERNEL::NormalizedCellType, std::vector<std::size_t> >((*it).getGeo(),std::vector<std::size_t>(1,i)));
-      (*it0).second.push_back(i);
+      else
+        (*it0).second.push_back(i);
     }
   if(m.size()==_items.size())
     {
@@ -337,7 +1900,7 @@ MEDFileField1TSStructItem MEDFileField1TSStructItem::simplifyMeOnCellEntity(cons
       const std::vector<std::size_t>& ids=m[i].second;
       std::vector<const MEDFileField1TSStructItem2 *>objs(ids.size());
       for(std::size_t j=0;j<ids.size();j++)
-        objs[j]=&_items[j];
+        objs[j]=&_items[ids[j]];
       items[i]=MEDFileField1TSStructItem2::BuildAggregationOf(objs,globs);
     }
   MEDFileField1TSStructItem ret(ON_CELLS,items);
@@ -348,14 +1911,14 @@ MEDFileField1TSStructItem MEDFileField1TSStructItem::simplifyMeOnCellEntity(cons
 /*!
  * \a this is expected to be ON_CELLS and simplified.
  */
-bool MEDFileField1TSStructItem::isCompatibleWithNodesDiscr(const MEDFileField1TSStructItem& other, const MEDFileMeshStruct *meshSt, const MEDFileFieldGlobs *globs) const throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStructItem::isCompatibleWithNodesDiscr(const MEDFileField1TSStructItem& other, const MEDFileMeshStruct *meshSt, const MEDFileFieldGlobsReal *globs) const
 {
   if(other._type!=ON_NODES)
     throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isCompatibleWithNodesDiscr : other must be on nodes !");
   if(other._items.size()!=1)
     throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isCompatibleWithNodesDiscr : other is on nodes but number of subparts !");
   int theFirstLevFull;
-  bool ret0=isFullyOnExactlyOneLev(meshSt,theFirstLevFull);
+  bool ret0=isFullyOnOneLev(meshSt,theFirstLevFull);
   const MEDFileField1TSStructItem2& otherNodeIt(other._items[0]);
   if(otherNodeIt.getPflName().empty())
     {//on all nodes
@@ -381,68 +1944,155 @@ bool MEDFileField1TSStructItem::isCompatibleWithNodesDiscr(const MEDFileField1TS
     }
 }
 
-bool MEDFileField1TSStructItem::isFullyOnExactlyOneLev(const MEDFileMeshStruct *meshSt, int& theFirstLevFull) const throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStructItem::isFullyOnOneLev(const MEDFileMeshStruct *meshSt, int& theFirstLevFull) const
 {
   if(_type!=ON_CELLS)
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnExactlyOneLev : works only for ON_CELLS discretization !");
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnOneLev : works only for ON_CELLS discretization !");
   if(_items.empty())
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnExactlyOneLev : items vector is empty !");
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnOneLev : items vector is empty !");
   int nbOfLevs(meshSt->getNumberOfLevs());
   if(nbOfLevs==0)
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnExactlyOneLev : no levels in input mesh structure !");
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnOneLev : no levels in input mesh structure !");
+  std::vector<int> levs(nbOfLevs);
   theFirstLevFull=1;
-  int nbOfGT=0;
-  bool firstShot(true);
   std::set<INTERP_KERNEL::NormalizedCellType> gts;
   for(std::vector< MEDFileField1TSStructItem2 >::const_iterator it=_items.begin();it!=_items.end();it++)
     {
       if(!(*it).getPflName().empty())
         return false;
-      INTERP_KERNEL::NormalizedCellType gt;
+      INTERP_KERNEL::NormalizedCellType gt((*it).getGeo());
       if(gts.find(gt)!=gts.end())
-        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnExactlyOneLev : internal error !");
+        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnOneLev : internal error !");
       gts.insert(gt);
       int pos(meshSt->getLevelOfGeoType((*it).getGeo()));
-      if(firstShot)
-        theFirstLevFull=pos;
-      else
-        if(theFirstLevFull!=pos)
-          return false;
-      firstShot=false;
-      nbOfGT++;
+      levs[-pos]++;
     }
-  return nbOfGT==meshSt->getNumberOfGeoTypesInLev(theFirstLevFull);
+  for(int i=0;i<nbOfLevs;i++)
+    if(meshSt->getNumberOfGeoTypesInLev(-i)==levs[i])
+      { theFirstLevFull=-i; return true; }
+  return false;
 }
 
-const MEDFileField1TSStructItem2& MEDFileField1TSStructItem::operator[](std::size_t i) const throw(INTERP_KERNEL::Exception)
+const MEDFileField1TSStructItem2& MEDFileField1TSStructItem::operator[](std::size_t i) const
 {
-  if(i<0 || i>=_items.size())
+  if(i>=_items.size())
     throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::operator[] : input is not in valid range !");
   return _items[i];
 }
 
+std::size_t MEDFileField1TSStructItem::getHeapMemorySizeWithoutChildren() const
+{
+  std::size_t ret(_items.size()*sizeof(MEDFileField1TSStructItem2));
+  return ret;
+}
+
+std::vector<const BigMemoryObject *> MEDFileField1TSStructItem::getDirectChildrenWithNull() const
+{
+  std::vector<const BigMemoryObject *> ret;
+  for(std::vector< MEDFileField1TSStructItem2 >::const_iterator it=_items.begin();it!=_items.end();it++)
+    ret.push_back(&(*it));
+  return ret;
+}
+
+MEDMeshMultiLev *MEDFileField1TSStructItem::buildFromScratchDataSetSupportOnCells(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) const
+{
+  std::size_t sz(_items.size());
+  std::vector<INTERP_KERNEL::NormalizedCellType> a0(sz);
+  std::vector<const DataArrayInt *> a1(sz);
+  std::vector<int> a2(sz);
+  std::size_t i(0);
+  for(std::vector< MEDFileField1TSStructItem2 >::const_iterator it=_items.begin();it!=_items.end();it++,i++)
+    {
+      a0[i]=(*it).getGeo();
+      a1[i]=(*it).getPfl(globs);
+      a2[i]=mst->getNumberOfElemsOfGeoType((*it).getGeo());
+    }
+  return MEDMeshMultiLev::New(mst->getTheMesh(),a0,a1,a2);
+}
+
+std::vector<INTERP_KERNEL::NormalizedCellType> MEDFileField1TSStructItem::getGeoTypes(const MEDFileMesh *m) const
+{
+  std::vector<INTERP_KERNEL::NormalizedCellType> ret;
+  if(_type==ON_NODES)
+    {
+      if(!_items.empty() && _items[0].getPflName().empty())
+        {
+          if(m)
+            return m->getAllGeoTypes();
+          else
+            return ret;
+        }
+      else
+        return ret;
+    }
+  for(std::vector< MEDFileField1TSStructItem2 >::const_iterator it=_items.begin();it!=_items.end();it++)
+    {
+      INTERP_KERNEL::NormalizedCellType elt((*it).getGeo());
+      std::vector<INTERP_KERNEL::NormalizedCellType>::iterator it2(std::find(ret.begin(),ret.end(),elt));
+      if(it2==ret.end())
+        ret.push_back(elt);
+    }
+  return ret;
+}
+
+MEDFileField1TSStructItem MEDFileField1TSStructItem::BuildItemFrom(const MEDFileAnyTypeField1TS *ref, const MEDFileMeshStruct *meshSt)
+{
+  TypeOfField atype;
+  std::vector< MEDFileField1TSStructItem2 > anItems;
+  //
+  std::vector< std::vector<std::string> > pfls,locs;
+  std::vector< std::vector<TypeOfField> > typesF;
+  std::vector<INTERP_KERNEL::NormalizedCellType> geoTypes;
+  std::vector< std::vector<std::pair<int,int> > > strtEnds=ref->getFieldSplitedByType(std::string(),geoTypes,typesF,pfls,locs);
+  std::size_t nbOfGeoTypes(geoTypes.size());
+  if(nbOfGeoTypes==0)
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct : not null by empty ref  !");
+  bool isFirst=true;
+  for(std::size_t i=0;i<nbOfGeoTypes;i++)
+    {
+      std::size_t sz=typesF[i].size();
+      if(strtEnds[i].size()<1 || sz<1 || pfls[i].size()<1)
+        throw INTERP_KERNEL::Exception("MEDFileField1TSStruct : internal error #1 !");
+      //
+      if(isFirst)
+        atype=typesF[i][0];
+      isFirst=false;
+      //
+      for(std::size_t j=0;j<sz;j++)
+        {
+          if(atype==typesF[i][j])
+            anItems.push_back(MEDFileField1TSStructItem2(geoTypes[i],strtEnds[i][j],pfls[i][j],locs[i][j]));
+          else
+            throw INTERP_KERNEL::Exception("MEDFileField1TSStruct : can be applied only on single spatial discretization fields ! Call SplitPerDiscretization method !");
+        }
+    }
+  MEDFileField1TSStructItem ret(atype,anItems);
+  ret.checkWithMeshStruct(meshSt,ref);
+  return ret;
+}
+
 //=
 
-MEDFileField1TSStruct *MEDFileField1TSStruct::New(const MEDFileAnyTypeField1TS *ref) throw(INTERP_KERNEL::Exception)
+MEDFileField1TSStruct *MEDFileField1TSStruct::New(const MEDFileAnyTypeField1TS *ref, MEDFileMeshStruct *mst)
 {
-  return new MEDFileField1TSStruct(ref);
+  return new MEDFileField1TSStruct(ref,mst);
 }
 
-MEDFileField1TSStruct::MEDFileField1TSStruct(const MEDFileAnyTypeField1TS *ref)
+MEDFileField1TSStruct::MEDFileField1TSStruct(const MEDFileAnyTypeField1TS *ref, MEDFileMeshStruct *mst)
 {
-  _already_checked.push_back(BuildItemFrom(ref));
+  _already_checked.push_back(MEDFileField1TSStructItem::BuildItemFrom(ref,mst));
 }
 
-void MEDFileField1TSStruct::checkWithMeshStruct(MEDFileMeshStruct *mst, const MEDFileFieldGlobs *globs) throw(INTERP_KERNEL::Exception)
+void MEDFileField1TSStruct::checkWithMeshStruct(MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs)
 {
   if(_already_checked.empty())
     throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::checkWithMeshStruct : not correctly initialized !");
   _already_checked.back().checkWithMeshStruct(mst,globs);
 }
 
-bool MEDFileField1TSStruct::isEqualConsideringThePast(const MEDFileAnyTypeField1TS *other) const throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStruct::isEqualConsideringThePast(const MEDFileAnyTypeField1TS *other, const MEDFileMeshStruct *mst) const
 {
-  MEDFileField1TSStructItem b(BuildItemFrom(other));
+  MEDFileField1TSStructItem b(MEDFileField1TSStructItem::BuildItemFrom(other,mst));
   for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++)
     {
       if((*it)==b)
@@ -454,14 +2104,14 @@ bool MEDFileField1TSStruct::isEqualConsideringThePast(const MEDFileAnyTypeField1
 /*!
  * Not const because \a other structure will be added to the \c _already_checked attribute in case of success.
  */
-bool MEDFileField1TSStruct::isSupportSameAs(const MEDFileAnyTypeField1TS *other) throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStruct::isSupportSameAs(const MEDFileAnyTypeField1TS *other, const MEDFileMeshStruct *meshSt)
 {
   if(_already_checked.empty())
     throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::isSupportSameAs : no ref !");
-  MEDFileField1TSStructItem b(BuildItemFrom(other));
+  MEDFileField1TSStructItem b(MEDFileField1TSStructItem::BuildItemFrom(other,meshSt));
   if(!_already_checked[0].isEntityCell() || !b.isEntityCell())
     throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::isSupportSameAs : only available on cell entities !");
-  MEDFileField1TSStructItem other1(b.simplifyMeOnCellEntity(other->contentNotNull()));
+  MEDFileField1TSStructItem other1(b.simplifyMeOnCellEntity(other));
   int found=-1,i=0;
   for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++,i++)
     if((*it).isComputed())
@@ -469,117 +2119,210 @@ bool MEDFileField1TSStruct::isSupportSameAs(const MEDFileAnyTypeField1TS *other)
   bool ret(false);
   if(found==-1)
     {
-      MEDFileField1TSStructItem this1(_already_checked[0].simplifyMeOnCellEntity(other->contentNotNull()));
-      ret=this1.isCellSupportEqual(other1);
+      MEDFileField1TSStructItem this1(_already_checked[0].simplifyMeOnCellEntity(other));
+      ret=this1.isCellSupportEqual(other1,other);
       if(ret)
         _already_checked.push_back(this1);
     }
   else
-    ret=_already_checked[found].isCellSupportEqual(other1);
+    ret=_already_checked[found].isCellSupportEqual(other1,other);
   if(ret)
     _already_checked.push_back(b);
   return ret;
 }
 
-bool MEDFileField1TSStruct::isCompatibleWithNodesDiscr(const MEDFileAnyTypeField1TS *other, const MEDFileMeshStruct *meshSt) throw(INTERP_KERNEL::Exception)
+/*!
+ * \param [in] other - a field with only one spatial discretization : ON_NODES.
+ */
+bool MEDFileField1TSStruct::isCompatibleWithNodesDiscr(const MEDFileAnyTypeField1TS *other, const MEDFileMeshStruct *meshSt)
 {
   if(_already_checked.empty())
     throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::isCompatibleWithNodesDiscr : no ref !");
-  if(!_already_checked[0].isEntityCell())
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::isCompatibleWithNodesDiscr : only available on cell entities !");
-  MEDFileField1TSStructItem other1(BuildItemFrom(other));
-  //
-  int found=-1,i=0;
-  for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++,i++)
-    if((*it).isComputed())
-      { found=i; break; }
-  bool ret(false);
-  if(found==-1)
+  MEDFileField1TSStructItem other1(MEDFileField1TSStructItem::BuildItemFrom(other,meshSt));
+  if(_already_checked[0].isEntityCell())
     {
-      MEDFileField1TSStructItem this1(_already_checked[0].simplifyMeOnCellEntity(other->contentNotNull()));
-      ret=this1.isCompatibleWithNodesDiscr(other1,meshSt,other->contentNotNull());
+      int found=-1,i=0;
+      for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++,i++)
+        if((*it).isComputed())
+          { found=i; break; }
+      bool ret(false);
+      if(found==-1)
+        {
+          MEDFileField1TSStructItem this1(_already_checked[0].simplifyMeOnCellEntity(other));
+          ret=this1.isCompatibleWithNodesDiscr(other1,meshSt,other);
+          if(ret)
+            _already_checked.push_back(this1);
+        }
+      else
+        ret=_already_checked[found].isCompatibleWithNodesDiscr(other1,meshSt,other);
       if(ret)
-        _already_checked.push_back(this1);
+        _already_checked.push_back(other1);
+      return ret;
     }
   else
-    ret=_already_checked[found].isCompatibleWithNodesDiscr(other1,meshSt,other->contentNotNull());
-  if(ret)
-    _already_checked.push_back(other1);
+    return _already_checked[0].isNodeSupportEqual(other1,other);
+}
+
+std::size_t MEDFileField1TSStruct::getHeapMemorySizeWithoutChildren() const
+{
+  std::size_t ret(_already_checked.capacity()*sizeof(MEDFileField1TSStructItem));
   return ret;
 }
 
-std::size_t MEDFileField1TSStruct::getHeapMemorySize() const
+std::vector<const BigMemoryObject *> MEDFileField1TSStruct::getDirectChildrenWithNull() const
 {
-  return 0;
+  std::vector<const BigMemoryObject *> ret;
+  for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++)
+    ret.push_back(&(*it));
+  return ret;
 }
 
-MEDFileField1TSStructItem MEDFileField1TSStruct::BuildItemFrom(const MEDFileAnyTypeField1TS *ref)
+MEDMeshMultiLev *MEDFileField1TSStruct::buildFromScratchDataSetSupport(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) const
 {
-  TypeOfField atype;
-  std::vector< MEDFileField1TSStructItem2 > anItems;
-  //
-  std::vector< std::vector<std::string> > pfls,locs;
-  std::vector< std::vector<TypeOfField> > typesF;
-  std::vector<INTERP_KERNEL::NormalizedCellType> geoTypes;
-  std::vector< std::vector<std::pair<int,int> > > strtEnds=ref->getFieldSplitedByType(0,geoTypes,typesF,pfls,locs);
-  std::size_t nbOfGeoTypes(geoTypes.size());
-  if(nbOfGeoTypes==0)
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct : not null by empty ref  !");
-  bool isFirst=true;
-  for(std::size_t i=0;i<nbOfGeoTypes;i++)
+  if(_already_checked.empty())
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::buildFromScratchDataSetSupport : No outline structure in this !");
+  int pos0(-1),pos1(-1);
+  if(presenceOfCellDiscr(pos0))
     {
-      std::size_t sz=typesF.size();
-      if(strtEnds[i].size()<1 || sz<1 || pfls[i].size()<1)
-        throw INTERP_KERNEL::Exception("MEDFileField1TSStruct : internal error #1 !");
-      //
-      if(isFirst)
-        atype=typesF[i][0];
-      isFirst=false;
-      //
-      for(std::size_t j=0;j<sz;j++)
+      MEDCouplingAutoRefCountObjectPtr<MEDMeshMultiLev> ret(_already_checked[pos0].buildFromScratchDataSetSupportOnCells(mst,globs));
+      if(presenceOfPartialNodeDiscr(pos1))
+        ret->setNodeReduction(_already_checked[pos1][0].getPfl(globs));
+      return ret.retn();
+    }
+  else
+    {
+      if(!presenceOfPartialNodeDiscr(pos1))
+        {//we have only all nodes, no cell definition info -> all existing levels !;
+          return MEDMeshMultiLev::New(mst->getTheMesh(),mst->getTheMesh()->getNonEmptyLevels());
+        }
+      else
+        return MEDMeshMultiLev::NewOnlyOnNode(mst->getTheMesh(),_already_checked[pos1][0].getPfl(globs));
+    }
+}
+
+bool MEDFileField1TSStruct::isDataSetSupportFastlyEqualTo(const MEDFileField1TSStruct& other, const MEDFileFieldGlobsReal *globs) const
+{
+  int b0,b1;
+  bool a0(presenceOfCellDiscr(b0)),a1(presenceOfPartialNodeDiscr(b1));
+  int d0,d1;
+  bool c0(other.presenceOfCellDiscr(d0)),c1(other.presenceOfPartialNodeDiscr(d1)); 
+  if(a0!=c0 || a1!=c1)
+    return false;
+  if(a0)
+    if(!_already_checked[b0].isCellSupportEqual(other._already_checked[d0],globs))
+      return false;
+  if(a1)
+    if(!_already_checked[b1].isNodeSupportEqual(other._already_checked[d1],globs))
+      return false;
+  return true;
+}
+
+std::vector<INTERP_KERNEL::NormalizedCellType> MEDFileField1TSStruct::getGeoTypes(const MEDFileMesh *m) const
+{
+  std::vector<INTERP_KERNEL::NormalizedCellType> ret;
+  for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++)
+    {
+      std::vector<INTERP_KERNEL::NormalizedCellType> ret2((*it).getGeoTypes(m));
+      for(std::vector<INTERP_KERNEL::NormalizedCellType>::const_iterator it2=ret2.begin();it2!=ret2.end();it2++)
         {
-          if(atype!=typesF[i][j])
-            anItems.push_back(MEDFileField1TSStructItem2(geoTypes[i],strtEnds[i][j],pfls[i][j],locs[i][j]));
+          if(*it2==INTERP_KERNEL::NORM_ERROR)
+            continue;
+          std::vector<INTERP_KERNEL::NormalizedCellType>::iterator it3(std::find(ret.begin(),ret.end(),*it2));
+          if(it3==ret.end())
+            ret.push_back(*it2);
+        }
+    }
+  return ret;
+}
+
+/*!
+ * Returns true if presence in \a this of discretization ON_CELLS, ON_GAUSS_PT, ON_GAUSS_NE.
+ * If true is returned the pos of the easiest is returned. The easiest is the first element in \a this having the less splitted subparts.
+ */
+bool MEDFileField1TSStruct::presenceOfCellDiscr(int& pos) const
+{
+  std::size_t refSz(std::numeric_limits<std::size_t>::max());
+  bool ret(false);
+  int i(0);
+  for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++,i++)
+    {
+      if((*it).getType()!=ON_NODES)
+        {
+          ret=true;
+          std::size_t sz((*it).getNumberOfItems());
+          if(refSz>sz)
+            { pos=i; refSz=sz; }
+        }
+    }
+  if(refSz==0)
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::presenceOfCellDiscr : an element in this on entity CELL is empty !");
+  return ret;
+}
+
+/*!
+ * Returns true if presence in \a this of discretization ON_NODES.
+ * If true is returned the pos of the first element containing the single subpart.
+ */
+bool MEDFileField1TSStruct::presenceOfPartialNodeDiscr(int& pos) const
+{
+  int i(0);
+  for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++,i++)
+    {
+      if((*it).getType()==ON_NODES)
+        {
+          std::size_t sz((*it).getNumberOfItems());
+          if(sz==1)
+            {
+              if(!(*it)[0].getPflName().empty())
+                { pos=i; return true; }
+            }
           else
-            throw INTERP_KERNEL::Exception("MEDFileField1TSStruct : can be applied only on single spatial discretization fields ! Call SplitPerDiscretization method !");
+            throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::presenceOfPartialNodeDiscr : an element in this on entity NODE is split into several parts !");
         }
     }
-  return MEDFileField1TSStructItem(atype,anItems);
+  return false;
 }
 
 //=
 
-MEDFileFastCellSupportComparator *MEDFileFastCellSupportComparator::New(const MEDFileMesh *m, const MEDFileAnyTypeFieldMultiTS *ref) throw(INTERP_KERNEL::Exception)
+MEDFileFastCellSupportComparator *MEDFileFastCellSupportComparator::New(const MEDFileMeshStruct *m, const MEDFileAnyTypeFieldMultiTS *ref)
 {
   return new MEDFileFastCellSupportComparator(m,ref);
 }
 
-MEDFileFastCellSupportComparator::MEDFileFastCellSupportComparator(const MEDFileMesh *m, const MEDFileAnyTypeFieldMultiTS *ref)
+MEDFileFastCellSupportComparator::MEDFileFastCellSupportComparator(const MEDFileMeshStruct *m, const MEDFileAnyTypeFieldMultiTS *ref)
 {
-  _mesh_comp=MEDFileMeshStruct::New(m);
+  if(!m)
+    throw INTERP_KERNEL::Exception("MEDFileFastCellSupportComparator constructor : null input mesh struct !");
+  _mesh_comp=const_cast<MEDFileMeshStruct *>(m); _mesh_comp->incrRef();
   int nbPts=ref->getNumberOfTS();
   _f1ts_cmps.resize(nbPts);
   for(int i=0;i<nbPts;i++)
     {
       MEDCouplingAutoRefCountObjectPtr<MEDFileAnyTypeField1TS> elt=ref->getTimeStepAtPos(i);
-      _f1ts_cmps[i]=MEDFileField1TSStruct::New(elt);
-      _f1ts_cmps[i]->checkWithMeshStruct(_mesh_comp,elt->contentNotNull());
+      _f1ts_cmps[i]=MEDFileField1TSStruct::New(elt,_mesh_comp);
+      _f1ts_cmps[i]->checkWithMeshStruct(_mesh_comp,elt);
     }
 }
 
-std::size_t MEDFileFastCellSupportComparator::getHeapMemorySize() const
+std::size_t MEDFileFastCellSupportComparator::getHeapMemorySizeWithoutChildren() const
 {
-  /*std::size_t part1=sizeof(MEDFileFastCellSupportComparator)+_mesh_name.capacity()+_already_passed_code1.capacity()*sizeof(std::vector<int>)+_already_passed_code2.capacity()*sizeof(void*)+_m_geo_types_distrib.capacity()*sizeof(std::vector<int>);
-  std::size_t part2=0;
-  for(std::vector< std::vector<int> >::const_iterator it=_already_passed_code1.begin();it!=_already_passed_code1.end();it++)
-    part2+=(*it).capacity()*(sizeof(int)+sizeof(const DataArrayInt *));
-  for(std::vector< std::vector<int> >::const_iterator it2=_m_geo_types_distrib.begin();it2!=_m_geo_types_distrib.end();it2++)
-    part2+=(*it2).capacity()*sizeof(int);
-    return part1+part2;*/
-  return 0;
+  std::size_t ret(_f1ts_cmps.capacity()*sizeof(MEDCouplingAutoRefCountObjectPtr<MEDFileField1TSStruct>));
+  return ret;
+}
+
+std::vector<const BigMemoryObject *> MEDFileFastCellSupportComparator::getDirectChildrenWithNull() const
+{
+  std::vector<const BigMemoryObject *> ret;
+  const MEDFileMeshStruct *mst(_mesh_comp);
+  if(mst)
+    ret.push_back(mst);
+  for(std::vector< MEDCouplingAutoRefCountObjectPtr<MEDFileField1TSStruct> >::const_iterator it=_f1ts_cmps.begin();it!=_f1ts_cmps.end();it++)
+    ret.push_back((const MEDFileField1TSStruct *)*it);
+  return ret;
 }
 
-bool MEDFileFastCellSupportComparator::isEqual(const MEDFileAnyTypeFieldMultiTS *other) throw(INTERP_KERNEL::Exception)
+bool MEDFileFastCellSupportComparator::isEqual(const MEDFileAnyTypeFieldMultiTS *other)
 {
   int nbPts=other->getNumberOfTS();
   if(nbPts!=(int)_f1ts_cmps.size())
@@ -590,14 +2333,14 @@ bool MEDFileFastCellSupportComparator::isEqual(const MEDFileAnyTypeFieldMultiTS
   for(int i=0;i<nbPts;i++)
     {
       MEDCouplingAutoRefCountObjectPtr<MEDFileAnyTypeField1TS> elt=other->getTimeStepAtPos(i);
-      if(!_f1ts_cmps[i]->isEqualConsideringThePast(elt))
-        if(!_f1ts_cmps[i]->isSupportSameAs(elt))
+      if(!_f1ts_cmps[i]->isEqualConsideringThePast(elt,_mesh_comp))
+        if(!_f1ts_cmps[i]->isSupportSameAs(elt,_mesh_comp))
           return false;
     }
   return true;
 }
 
-bool MEDFileFastCellSupportComparator::isCompatibleWithNodesDiscr(const MEDFileAnyTypeFieldMultiTS *other) throw(INTERP_KERNEL::Exception)
+bool MEDFileFastCellSupportComparator::isCompatibleWithNodesDiscr(const MEDFileAnyTypeFieldMultiTS *other)
 {
   int nbPts=other->getNumberOfTS();
   if(nbPts!=(int)_f1ts_cmps.size())
@@ -613,3 +2356,52 @@ bool MEDFileFastCellSupportComparator::isCompatibleWithNodesDiscr(const MEDFileA
     }
   return true;
 }
+
+MEDMeshMultiLev *MEDFileFastCellSupportComparator::buildFromScratchDataSetSupport(int timeStepId, const MEDFileFieldGlobsReal *globs) const
+{
+  if(timeStepId<0 || timeStepId>=(int)_f1ts_cmps.size())
+    {
+      std::ostringstream oss; oss << "MEDFileFastCellSupportComparator::buildFromScratchDataSetSupport : requested time step id #" << timeStepId << " is not in [0," << _f1ts_cmps.size() << ") !";
+      throw INTERP_KERNEL::Exception(oss.str().c_str());
+    }
+  const MEDFileField1TSStruct *obj(_f1ts_cmps[timeStepId]);
+  if(!obj)
+    {
+      std::ostringstream oss; oss << "MEDFileFastCellSupportComparator::buildFromScratchDataSetSupport : at time step id #" << timeStepId << " no field structure overview defined !";
+      throw INTERP_KERNEL::Exception(oss.str().c_str());
+    }
+  return obj->buildFromScratchDataSetSupport(_mesh_comp,globs);
+}
+
+bool MEDFileFastCellSupportComparator::isDataSetSupportEqualToThePreviousOne(int timeStepId, const MEDFileFieldGlobsReal *globs) const
+{
+  if(timeStepId<=0 || timeStepId>=(int)_f1ts_cmps.size())
+    {
+      std::ostringstream oss; oss << "MEDFileFastCellSupportComparator::isDataSetSupportEqualToThePreviousOne : requested time step id #" << timeStepId << " is not in [1," << _f1ts_cmps.size() << ") !";
+      throw INTERP_KERNEL::Exception(oss.str().c_str());
+    }
+  const MEDFileField1TSStruct *obj(_f1ts_cmps[timeStepId]);
+  const MEDFileField1TSStruct *objRef(_f1ts_cmps[timeStepId-1]);
+  return objRef->isDataSetSupportFastlyEqualTo(*obj,globs);
+}
+
+int MEDFileFastCellSupportComparator::getNumberOfTS() const
+{
+  return _f1ts_cmps.size();
+}
+
+std::vector<INTERP_KERNEL::NormalizedCellType> MEDFileFastCellSupportComparator::getGeoTypesAt(int timeStepId, const MEDFileMesh *m) const
+{
+  if(timeStepId<0 || timeStepId>=(int)_f1ts_cmps.size())
+    {
+      std::ostringstream oss; oss << "MEDFileFastCellSupportComparator::getGeoTypesAt : requested time step id #" << timeStepId << " is not in [0," << _f1ts_cmps.size() << ") !";
+      throw INTERP_KERNEL::Exception(oss.str().c_str());
+    }
+  const MEDFileField1TSStruct *elt(_f1ts_cmps[timeStepId]);
+  if(!elt)
+    {
+      std::ostringstream oss; oss << "MEDFileFastCellSupportComparator::getGeoTypesAt : requested time step id #" << timeStepId << " points to a NULL pointer !";
+      throw INTERP_KERNEL::Exception(oss.str().c_str());
+    }
+  return elt->getGeoTypes(m);
+}