X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=src%2FMEDLoader%2FMEDFileFieldOverView.cxx;h=825a780e57708903c583d795b7d5dbf975257f4c;hb=96bc4e98b56b27856dced632cdb6767afb411179;hp=98fbbf48ce44f4e76fd30714a493cc8ee0b7803d;hpb=d96c5ff5118cac84a092e1e08e66da6d0bc6c143;p=tools%2Fmedcoupling.git

diff --git a/src/MEDLoader/MEDFileFieldOverView.cxx b/src/MEDLoader/MEDFileFieldOverView.cxx
index 98fbbf48c..825a780e5 100644
--- a/src/MEDLoader/MEDFileFieldOverView.cxx
+++ b/src/MEDLoader/MEDFileFieldOverView.cxx
@@ -26,6 +26,9 @@
 
 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 char MEDFileField1TSStructItem2::NEWLY_CREATED_PFL_NAME[]="???";
 
 MEDFileMeshStruct *MEDFileMeshStruct::New(const MEDFileMesh *mesh)
@@ -33,7 +36,7 @@ MEDFileMeshStruct *MEDFileMeshStruct::New(const MEDFileMesh *mesh)
   return new MEDFileMeshStruct(mesh);
 }
 
-std::size_t MEDFileMeshStruct::getHeapMemorySize() const
+std::size_t MEDFileMeshStruct::getHeapMemorySizeWithoutChildren() const
 {
   std::size_t ret(0);
   for(std::vector< std::vector<int> >::const_iterator it0=_geo_types_distrib.begin();it0!=_geo_types_distrib.end();it0++)
@@ -42,20 +45,22 @@ std::size_t MEDFileMeshStruct::getHeapMemorySize() const
   return ret;
 }
 
+std::vector<const BigMemoryObject *> MEDFileMeshStruct::getDirectChildren() 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++)
-    {
-      MEDCouplingAutoRefCountObjectPtr<MEDCouplingMesh> mLev=mesh->getGenMeshAtLevel(*lev);
-      _geo_types_distrib[-(*lev)]=mLev->getDistributionOfTypes();
-    }
+    _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--)
@@ -71,7 +76,7 @@ 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)
+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++)
     {
@@ -91,10 +96,10 @@ int MEDFileMeshStruct::getNumberOfLevs() const
   return (int)_geo_types_distrib.size();
 }
 
-int MEDFileMeshStruct::getNumberOfGeoTypesInLev(int relativeLev) const throw(INTERP_KERNEL::Exception)
+int MEDFileMeshStruct::getNumberOfGeoTypesInLev(int relativeLev) const
 {
   int pos(-relativeLev);
-  if(pos<0 || pos>=_geo_types_distrib.size())
+  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)
@@ -104,1129 +109,2049 @@ int MEDFileMeshStruct::getNumberOfGeoTypesInLev(int relativeLev) const throw(INT
 
 //=
 
-MEDFileField1TSStructItem2::MEDFileField1TSStructItem2()
+std::size_t MEDMeshMultiLev::getHeapMemorySizeWithoutChildren() const
 {
+  return 0;
 }
 
-MEDFileField1TSStructItem2::MEDFileField1TSStructItem2(INTERP_KERNEL::NormalizedCellType a, const std::pair<int,int>& b, const std::string& c, const std::string& d):_geo_type(a),_start_end(b),_pfl(DataArrayInt::New()),_loc(d),_nb_of_entity(-1)
+std::vector<const BigMemoryObject *> MEDMeshMultiLev::getDirectChildren() const
 {
-  _pfl->setName(c.c_str());
+  return std::vector<const BigMemoryObject *>();
 }
 
-void MEDFileField1TSStructItem2::checkWithMeshStructForCells(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
+MEDMeshMultiLev *MEDMeshMultiLev::New(const MEDFileMesh *m, const std::vector<int>& levs)
 {
-  int nbOfEnt=mst->getNumberOfElemsOfGeoType(_geo_type);
-  checkInRange(nbOfEnt,1,globs);
+  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] !");
 }
 
-void MEDFileField1TSStructItem2::checkWithMeshStructForGaussNE(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
+MEDMeshMultiLev *MEDMeshMultiLev::New(const MEDFileMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities)
 {
-  int nbOfEnt=mst->getNumberOfElemsOfGeoType(_geo_type);
-  const INTERP_KERNEL::CellModel& cm=INTERP_KERNEL::CellModel::GetCellModel(_geo_type);
-  checkInRange(nbOfEnt,(int)cm.getNumberOfNodes(),globs);
+  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] !");
 }
 
-void MEDFileField1TSStructItem2::checkWithMeshStructForGaussPT(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
+MEDMeshMultiLev *MEDMeshMultiLev::NewOnlyOnNode(const MEDFileMesh *m, const DataArrayInt *pflOnNode)
 {
-  if(!globs)
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::checkWithMeshStructForGaussPT : no globals specified !");
-  if(_loc.empty())
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::checkWithMeshStructForGaussPT : no localization specified !");
-  const MEDFileFieldLoc& loc=globs->getLocalization(_loc.c_str());
-  int nbOfEnt=mst->getNumberOfElemsOfGeoType(_geo_type);
-  checkInRange(nbOfEnt,loc.getNumberOfGaussPoints(),globs);
+  MEDCouplingAutoRefCountObjectPtr<MEDMeshMultiLev> ret(MEDMeshMultiLev::New(m,m->getNonEmptyLevels()));
+  ret->selectPartOfNodes(pflOnNode);
+  return ret.retn();
 }
 
-std::string MEDFileField1TSStructItem2::getPflName() const
+void MEDMeshMultiLev::setNodeReduction(const DataArrayInt *nr)
 {
-  return _pfl->getName();
+  if(nr)
+    nr->incrRef();
+  _node_reduction=const_cast<DataArrayInt*>(nr);
 }
 
-const DataArrayInt *MEDFileField1TSStructItem2::getPfl(const MEDFileFieldGlobsReal *globs) const
+bool MEDMeshMultiLev::isFastlyTheSameStruct(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs) const
 {
-  if(!_pfl->isAllocated())
+  if(fst.getType()==ON_NODES)
     {
-      if(_pfl->getName().empty())
-        return 0;
-      else
-        return globs->getProfile(_pfl->getName().c_str());
+      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==nr->getName())
+        return true;
+      return false;
     }
   else
-    return _pfl;
+    {
+      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 [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
+ * \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 MEDFileField1TSStructItem2::checkInRange(int nbOfEntity, int nip, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
+void MEDMeshMultiLev::retrieveFamilyIdsOnCells(DataArrayInt *& famIds, bool& isWithoutCopy) const
 {
-  _nb_of_entity=nbOfEntity;
-  if(_pfl->getName().empty())
+  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++)
     {
-      if(nbOfEntity!=(_start_end.second-_start_end.first)/nip)
-        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::checkInRange : Mismatch between number of entities and size of node field !");
-      return ;
+      const DataArrayInt *pfl(_pfls[i]);
+      if(pfl)
+        presenceOfPfls=true;
     }
-  else
+  if(!presenceOfPfls)
+    { famIds=const_cast<DataArrayInt *>(fids); famIds->incrRef(); isWithoutCopy=_cell_fam_ids_nocpy; 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++)
     {
-      if(!globs)
-        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::checkInRange : Presence of a profile on field whereas no globals found in file !");
-      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 !");
-      pfl->checkAllIdsInRange(0,nbOfEntity);
+      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);
 }
 
-bool MEDFileField1TSStructItem2::operator==(const MEDFileField1TSStructItem2& other) const throw(INTERP_KERNEL::Exception)
-{
-  //_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 MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+/*!
+ * \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
 {
-  if(_geo_type!=other._geo_type)
-    return false;
-  if(_nb_of_entity!=other._nb_of_entity)
-    return false;
-  if((_pfl->getName().empty() && !other._pfl->getName().empty()) || (!_pfl->getName().empty() && other._pfl->getName().empty()))
-    return false;
-  if(_pfl->getName().empty() && other._pfl->getName().empty())
-    return true;
-  const DataArrayInt *pfl1(getPfl(globs)),*pfl2(other.getPfl(globs));
-  return pfl1->isEqualWithoutConsideringStr(*pfl2);
+  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=_cell_num_ids_nocpy; 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);
 }
 
-bool MEDFileField1TSStructItem2::isNodeSupportEqual(const MEDFileField1TSStructItem2& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+/*!
+ * \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
 {
-  return isCellSupportEqual(other,globs);
+  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
+    {
+      isWithoutCopy=_node_fam_ids_nocpy;
+      famIds=const_cast<DataArrayInt *>(fids); famIds->incrRef();
+    }
 }
 
 /*!
- * \a objs must be non empty. \a objs should contain items having same geometric type.
+ * \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.
  */
-MEDFileField1TSStructItem2 MEDFileField1TSStructItem2::BuildAggregationOf(const std::vector<const MEDFileField1TSStructItem2 *>& objs, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
+void MEDMeshMultiLev::retrieveNumberIdsOnNodes(DataArrayInt *& numIds, bool& isWithoutCopy) const
 {
-  if(objs.empty())
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::BuildAggregationOf : empty input !");
-  if(objs.size()==1)
-    return MEDFileField1TSStructItem2(*objs[0]);
-  INTERP_KERNEL::NormalizedCellType gt(objs[0]->_geo_type);
-  int nbEntityRef(objs[0]->_nb_of_entity);
-  std::size_t sz(objs.size());
-  std::vector<const DataArrayInt *> arrs(sz);
-  for(std::size_t i=0;i<sz;i++)
-    {
-      const MEDFileField1TSStructItem2 *obj(objs[i]);
-      if(gt!=obj->_geo_type)
-        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::BuildAggregationOf : invalid situation ! All input must have the same geo type !");
-      if(nbEntityRef!=obj->_nb_of_entity)
-        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::BuildAggregationOf : invalid situation ! All input must have the global nb of entity !");
-      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)
+  const DataArrayInt *fids(_node_num_ids);
+  if(!fids)
+    { numIds=0; isWithoutCopy=true; return ; }
+  const DataArrayInt *nr(_node_reduction);
+  if(nr)
     {
-      std::pair<int,int> p(0,nbEntityRef);
-      std::string a,b;
-      MEDFileField1TSStructItem2 ret(gt,p,a,b);
-      ret._nb_of_entity=nbEntityRef;
-      return ret;
+      isWithoutCopy=false;
+      numIds=fids->selectByTupleIdSafe(nr->begin(),nr->end());
     }
   else
     {
-      arr->setName(NEWLY_CREATED_PFL_NAME);
-      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;
+      isWithoutCopy=_node_num_ids_nocpy;
+      numIds=const_cast<DataArrayInt *>(fids); numIds->incrRef();
     }
 }
 
-std::size_t MEDFileField1TSStructItem2::getHeapMemorySize() const
+void MEDMeshMultiLev::setFamilyIdsOnCells(DataArrayInt *famIds, bool isNoCopy)
 {
-  std::size_t ret(0);
-  const DataArrayInt *pfl(_pfl);
-  if(pfl)
-    ret+=pfl->getHeapMemorySize();
-  ret+=_loc.capacity();
-  return ret;
+  _cell_fam_ids=famIds;
+  if(famIds)
+    famIds->incrRef();
+  _cell_fam_ids_nocpy=isNoCopy;
 }
 
-//=
-
-MEDFileField1TSStructItem::MEDFileField1TSStructItem(TypeOfField a, const std::vector< MEDFileField1TSStructItem2 >& b):_computed(false),_type(a),_items(b)
+void MEDMeshMultiLev::setNumberIdsOnCells(DataArrayInt *numIds, bool isNoCopy)
 {
+  _cell_num_ids=numIds;
+  if(numIds)
+    numIds->incrRef();
+  _cell_num_ids_nocpy=isNoCopy;
 }
 
-void MEDFileField1TSStructItem::checkWithMeshStruct(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
+void MEDMeshMultiLev::setFamilyIdsOnNodes(DataArrayInt *famIds, bool isNoCopy)
 {
-  switch(_type)
-    {
-    case ON_NODES:
-      {
-        int nbOfEnt=mst->getNumberOfNodes();
-        if(_items.size()!=1)
-          throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::checkWithMeshStruct : for nodes field only one subdivision supported !");
-        _items[0].checkInRange(nbOfEnt,1,globs);
-        break ;
-      }
-    case ON_CELLS:
-      {
-        for(std::vector< MEDFileField1TSStructItem2 >::iterator it=_items.begin();it!=_items.end();it++)
-          (*it).checkWithMeshStructForCells(mst,globs);
-        break;
-      }
-    case ON_GAUSS_NE:
-      {
-        for(std::vector< MEDFileField1TSStructItem2 >::iterator it=_items.begin();it!=_items.end();it++)
-          (*it).checkWithMeshStructForGaussNE(mst,globs);
-        break;
-      }
-    case ON_GAUSS_PT:
-      {
-        for(std::vector< MEDFileField1TSStructItem2 >::iterator it=_items.begin();it!=_items.end();it++)
-          (*it).checkWithMeshStructForGaussPT(mst,globs);
-        break;
-      }
-    default:
-      throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::checkWithMeshStruct : not managed field type !");
-    }
+  _node_fam_ids=famIds;
+  if(famIds)
+    famIds->incrRef();
+  _node_fam_ids_nocpy=isNoCopy;
 }
 
-bool MEDFileField1TSStructItem::operator==(const MEDFileField1TSStructItem& other) const throw(INTERP_KERNEL::Exception)
+void MEDMeshMultiLev::setNumberIdsOnNodes(DataArrayInt *numIds, bool isNoCopy)
 {
-  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]==other._items[i]))
-      return false;
-  return true;
+  _node_num_ids=numIds;
+  if(numIds)
+    numIds->incrRef();
+  _node_num_ids_nocpy=isNoCopy;
 }
 
-bool MEDFileField1TSStructItem::isCellSupportEqual(const MEDFileField1TSStructItem& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+std::string MEDMeshMultiLev::getPflNameOfId(int id) 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;
+  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();
 }
 
-bool MEDFileField1TSStructItem::isNodeSupportEqual(const MEDFileField1TSStructItem& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+/*!
+ * 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
 {
-  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].isNodeSupportEqual(other._items[i],globs)))
-      return false;
-  return true;
+  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 !");
 }
 
-bool MEDFileField1TSStructItem::isEntityCell() const
+int MEDMeshMultiLev::getNumberOfNodes() const
 {
-  if(_type==ON_NODES)
-    return false;
-  else
-    return true;
+  return _nb_nodes;
 }
 
-class CmpGeo
-{
-public:
-  CmpGeo(INTERP_KERNEL::NormalizedCellType geoTyp):_geo_type(geoTyp) { }
-  bool operator()(const std::pair< INTERP_KERNEL::NormalizedCellType, std::vector<std::size_t> > & v) const { return _geo_type==v.first; }
-private:
-  INTERP_KERNEL::NormalizedCellType _geo_type;
-};
-
-MEDFileField1TSStructItem MEDFileField1TSStructItem::simplifyMeOnCellEntity(const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+DataArray *MEDMeshMultiLev::constructDataArray(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs, const DataArray *vals) const
 {
-  if(!isEntityCell())
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::simplifyMeOnCellEntity : must be on ON_CELLS, ON_GAUSS_NE or ON_GAUSS_PT !");
-  std::vector< std::pair< INTERP_KERNEL::NormalizedCellType, std::vector<std::size_t> > > m;
-  std::size_t i=0;
-  for(std::vector< MEDFileField1TSStructItem2 >::const_iterator it=_items.begin();it!=_items.end();it++,i++)
+  if(fst.getType()==ON_NODES)
     {
-      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)));
+      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);
+    }
+}
+
+MEDMeshMultiLev::MEDMeshMultiLev():_nb_nodes(0),_cell_fam_ids_nocpy(false)
+{
+}
+
+MEDMeshMultiLev::MEDMeshMultiLev(int nbNodes, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):_geo_types(gts),_nb_entities(nbEntities),_nb_nodes(nbNodes),_cell_fam_ids_nocpy(false),_cell_num_ids_nocpy(false),_node_fam_ids_nocpy(false),_node_num_ids_nocpy(false)
+{
+  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),_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_fam_ids_nocpy(other._cell_fam_ids_nocpy),_cell_num_ids(other._cell_num_ids),_cell_num_ids_nocpy(other._cell_num_ids_nocpy),_node_fam_ids(other._node_fam_ids),_node_fam_ids_nocpy(other._node_fam_ids_nocpy),_node_num_ids(other._node_num_ids),_node_num_ids_nocpy(other._node_num_ids_nocpy)
+{
+}
+
+//=
+
+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)
+{
+  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());
+  _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
-        (*it0).second.push_back(i);
+        throw INTERP_KERNEL::Exception("MEDUMeshMultiLev constructor : presence of a null pointer !");
+      _parts[i]=obj;
+      _geo_types[i]=obj->getCellModelEnum();
+      _nb_entities[i]=obj->getNumberOfCells();
     }
-  if(m.size()==_items.size())
+  // ids fields management
+  _cell_fam_ids_nocpy=(levs.size()==1);
+  if(_cell_fam_ids_nocpy)
     {
-      MEDFileField1TSStructItem ret(*this);
-      ret._type=ON_CELLS;
-      return ret;
+      const DataArrayInt *tmp(m->getFamilyFieldAtLevel(levs[0]));
+      if(tmp)
+        {
+          tmp->incrRef();
+          _cell_fam_ids=(const_cast<DataArrayInt *>(tmp));
+        }
     }
-  std::size_t sz(m.size());
-  std::vector< MEDFileField1TSStructItem2 > items(sz);
-  for(i=0;i<sz;i++)
+  else
     {
-      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[ids[j]];
-      items[i]=MEDFileField1TSStructItem2::BuildAggregationOf(objs,globs);
+      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)
+        _cell_fam_ids=DataArrayInt::Aggregate(tmps);
     }
-  MEDFileField1TSStructItem ret(ON_CELLS,items);
-  ret._computed=true;
-  return ret;
+  _cell_num_ids_nocpy=(levs.size()==1);
+  if(_cell_num_ids_nocpy)
+    {
+      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)
+        _cell_num_ids=DataArrayInt::Aggregate(tmps);
+    }
+  // node part
+  _node_fam_ids_nocpy=true;
+  {
+    const DataArrayInt *tmp(m->getFamilyFieldAtLevel(1));
+    if(tmp)
+      {
+        tmp->incrRef();
+        _node_fam_ids=(const_cast<DataArrayInt *>(tmp));
+      }
+  }
+  _node_num_ids_nocpy=true;
+  {
+    const DataArrayInt *tmp(m->getNumberFieldAtLevel(1));
+    if(tmp)
+      {
+        tmp->incrRef();
+        _node_num_ids=(const_cast<DataArrayInt *>(tmp));
+      }
+  }
 }
 
-/*!
- * \a this is expected to be ON_CELLS and simplified.
- */
-bool MEDFileField1TSStructItem::isCompatibleWithNodesDiscr(const MEDFileField1TSStructItem& other, const MEDFileMeshStruct *meshSt, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+MEDUMeshMultiLev *MEDUMeshMultiLev::New(const MEDFileUMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities)
 {
-  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=isFullyOnOneLev(meshSt,theFirstLevFull);
-  const MEDFileField1TSStructItem2& otherNodeIt(other._items[0]);
-  if(otherNodeIt.getPflName().empty())
-    {//on all nodes
-      if(!ret0)
-        return false;
-      return theFirstLevFull==0;
+  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->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
+    {
+      _cell_fam_ids_nocpy=true;
+      const DataArrayInt *famIds(m->getFamilyFieldAtLevel(lev));
+      if(famIds)
+        { _cell_fam_ids=const_cast<DataArrayInt*>(famIds); famIds->incrRef(); }
+      _cell_num_ids_nocpy=true;
+      const DataArrayInt *numIds(m->getNumberFieldAtLevel(lev));
+      if(numIds)
+        { _cell_num_ids=const_cast<DataArrayInt*>(numIds); numIds->incrRef(); }
+      _node_fam_ids_nocpy=true;
+      famIds=m->getFamilyFieldAtLevel(1);
+      if(famIds)
+        { _node_fam_ids=const_cast<DataArrayInt*>(famIds); famIds->incrRef(); }
+      _node_num_ids_nocpy=true;
+      numIds=m->getNumberFieldAtLevel(1);
+      if(numIds)
+        { _node_num_ids=const_cast<DataArrayInt*>(numIds); numIds->incrRef(); }
+      return ;
+    }
+  //
+  _cell_fam_ids_nocpy=false;
+  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);
+  _cell_num_ids_nocpy=false;
+  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
+  _node_fam_ids_nocpy=true;
+  const DataArrayInt *nodeFamIds(m->getFamilyFieldAtLevel(1));
+  if(nodeFamIds)
+    { _node_fam_ids=const_cast<DataArrayInt*>(nodeFamIds); nodeFamIds->incrRef(); }
+  _node_num_ids_nocpy=true;
+  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;
+     }
+   _node_reduction=DataArrayInt::Aggregate(aa);
+   _node_reduction->sort(true);
+   _node_reduction=_node_reduction->buildUnique();
+}
+
+MEDMeshMultiLev *MEDUMeshMultiLev::prepare() const
+{
+  return new MEDUMeshMultiLev(*this);
+}
+
+MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDUMeshMultiLev& other):MEDMeshMultiLev(other),_parts(other._parts)
+{
+}
+
+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;
+}
+
+/*! 
+ * 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
+{
+  if(_parts.empty())
+    throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : empty array !");
+  if(!(const MEDCoupling1GTUMesh *)_parts[0])
+    throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : first part is null !");
+  const DataArrayDouble *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)
+        {
+          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;
+            }
+          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];
+                }
+            }
+          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 tmp==((DataArrayDouble *)a);
+}
+
+void MEDUMeshMultiLev::reorderNodesIfNecessary(MEDCouplingAutoRefCountObjectPtr<DataArrayDouble>& coords, DataArrayInt *nodalConnVTK, DataArrayInt *polyhedNodalConnVTK) const
+{
+  const DataArrayInt *nr(_node_reduction);
+  if(!nr)
+    return ;
+  int sz(coords->getNumberOfTuples());
+  std::vector<bool> b(sz,false);
+  const int *work(nodalConnVTK->begin()),*endW(nodalConnVTK->end());
+  while(work!=endW)
     {
-      const DataArrayInt *pfl=globs->getProfile(otherNodeIt.getPflName().c_str());
-      MEDCouplingAutoRefCountObjectPtr<DataArrayInt> cpyPfl(pfl->deepCpy());
-      cpyPfl->sort();
-      int nbOfNodes(meshSt->getNumberOfNodes());
-      if(cpyPfl->isIdentity() && cpyPfl->getNumberOfTuples()==nbOfNodes)
-        {//on all nodes also !
-          if(!ret0)
-            return false;
-          return theFirstLevFull==0;
+      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 !");
         }
-      std::vector<bool> nodesFetched(nbOfNodes,false);
-      meshSt->getTheMesh()->whichAreNodesFetched(*this,globs,nodesFetched);
-      return cpyPfl->isFittingWith(nodesFetched);
     }
+  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()));
 }
 
-bool MEDFileField1TSStructItem::isFullyOnOneLev(const MEDFileMeshStruct *meshSt, int& theFirstLevFull) const throw(INTERP_KERNEL::Exception)
+//=
+
+MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev():_is_internal(true)
 {
-  if(_type!=ON_CELLS)
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnOneLev : works only for ON_CELLS discretization !");
-  if(_items.empty())
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnOneLev : items vector is empty !");
-  int nbOfLevs(meshSt->getNumberOfLevs());
-  if(nbOfLevs==0)
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnOneLev : no levels in input mesh structure !");
-  std::vector<int> levs(nbOfLevs);
-  theFirstLevFull=1;
-  int nbOfGT=0;
-  std::set<INTERP_KERNEL::NormalizedCellType> gts;
-  for(std::vector< MEDFileField1TSStructItem2 >::const_iterator it=_items.begin();it!=_items.end();it++)
+}
+
+MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const MEDFileStructuredMesh *m, const std::vector<int>& lev):_is_internal(true)
+{
+  // ids fields management
+  _cell_fam_ids_nocpy=true; _cell_num_ids_nocpy=true;
+  const DataArrayInt *tmp(0);
+  tmp=m->getFamilyFieldAtLevel(0);
+  if(tmp)
     {
-      if(!(*it).getPflName().empty())
-        return false;
-      INTERP_KERNEL::NormalizedCellType gt((*it).getGeo());
-      if(gts.find(gt)!=gts.end())
-        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnOneLev : internal error !");
-      gts.insert(gt);
-      int pos(meshSt->getLevelOfGeoType((*it).getGeo()));
-      levs[-pos]++;
+      tmp->incrRef();
+      _cell_fam_ids=const_cast<DataArrayInt *>(tmp);
+    }
+  tmp=m->getNumberFieldAtLevel(0);
+  if(tmp)
+    {
+      tmp->incrRef();
+      _cell_num_ids=const_cast<DataArrayInt *>(tmp);
+    }
+  //
+  _node_fam_ids_nocpy=true; _node_num_ids_nocpy=true;
+  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);
     }
-  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)
+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(nbOfNodes,gts,pfls,nbEntities),_is_internal(true)
 {
-  if(i<0 || i>=_items.size())
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::operator[] : input is not in valid range !");
-  return _items[i];
+  // ids fields management
+  _cell_fam_ids_nocpy=true; _cell_num_ids_nocpy=true;
+  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);
+    }
+  //
+  _node_fam_ids_nocpy=true; _node_num_ids_nocpy=true;
+  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);
+    }
 }
 
-std::size_t MEDFileField1TSStructItem::getHeapMemorySize() const
+MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const MEDStructuredMeshMultiLev& other):MEDMeshMultiLev(other),_is_internal(true)
 {
-  std::size_t ret(0);
-  for(std::vector< MEDFileField1TSStructItem2 >::const_iterator it=_items.begin();it!=_items.end();it++)
-    ret+=(*it).getHeapMemorySize();
-  ret+=_items.size()*sizeof(MEDFileField1TSStructItem2);
-  return ret;
 }
 
-MEDMeshMultiLev *MEDFileField1TSStructItem::buildFromScratchDataSetSupportOnCells(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+void MEDStructuredMeshMultiLev::selectPartOfNodes(const DataArrayInt *pflNodes)
 {
-  std::vector<INTERP_KERNEL::NormalizedCellType> a0;
-  std::vector<const DataArrayInt *> a1;
-  std::vector<int> a2;
-  std::size_t i(0);
-  for(std::vector< MEDFileField1TSStructItem2 >::const_iterator it=_items.begin();it!=_items.end();it++,i++)
+  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)
     {
-      a0[i]=(*it).getGeo();
-      a1[i]=(*it).getPfl(globs);
-      a2[i]=mst->getNumberOfElemsOfGeoType((*it).getGeo());
+      m=dynamic_cast<MEDCoupling1SGTUMesh *>(m->buildPartOfMySelfKeepCoords(pfl->begin(),pfl->end()));
     }
-  return MEDMeshMultiLev::New(mst->getTheMesh(),a0,a1,a2);
+  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;
 }
 
 //=
 
-MEDFileField1TSStruct *MEDFileField1TSStruct::New(const MEDFileAnyTypeField1TS *ref, MEDFileMeshStruct *mst) throw(INTERP_KERNEL::Exception)
+MEDCMeshMultiLev *MEDCMeshMultiLev::New(const MEDFileCMesh *m, const std::vector<int>& levs)
 {
-  return new MEDFileField1TSStruct(ref,mst);
+  return new MEDCMeshMultiLev(m,levs);
 }
 
-MEDFileField1TSStruct::MEDFileField1TSStruct(const MEDFileAnyTypeField1TS *ref, MEDFileMeshStruct *mst)
+MEDCMeshMultiLev *MEDCMeshMultiLev::New(const MEDFileCMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities)
 {
-  _already_checked.push_back(BuildItemFrom(ref,mst));
+  return new MEDCMeshMultiLev(m,gts,pfls,nbEntities);
 }
 
-void MEDFileField1TSStruct::checkWithMeshStruct(MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
+MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDFileCMesh *m, const std::vector<int>& levs):MEDStructuredMeshMultiLev(m,levs)
 {
-  if(_already_checked.empty())
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::checkWithMeshStruct : not correctly initialized !");
-  _already_checked.back().checkWithMeshStruct(mst,globs);
+  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;
+    }
 }
 
-bool MEDFileField1TSStruct::isEqualConsideringThePast(const MEDFileAnyTypeField1TS *other, const MEDFileMeshStruct *mst) const throw(INTERP_KERNEL::Exception)
+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)
 {
-  MEDFileField1TSStructItem b(BuildItemFrom(other,mst));
-  for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++)
+  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])
+    throw INTERP_KERNEL::Exception("MEDCMeshMultiLev constructor 2 : the unique geo type is invalid regarding meshdim !");
+  _coords.resize(mdim);
+  for(int i=0;i<mdim;i++)
     {
-      if((*it)==b)
-        return true;
+      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();
     }
-  return false;
 }
 
-/*!
- * 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, const MEDFileMeshStruct *meshSt) throw(INTERP_KERNEL::Exception)
+MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDCMeshMultiLev& other):MEDStructuredMeshMultiLev(other),_coords(other._coords)
 {
-  if(_already_checked.empty())
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::isSupportSameAs : no ref !");
-  MEDFileField1TSStructItem b(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));
-  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)
+}
+
+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
+{
+  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)
     {
-      MEDFileField1TSStructItem this1(_already_checked[0].simplifyMeOnCellEntity(other));
-      ret=this1.isCellSupportEqual(other1,other);
-      if(ret)
-        _already_checked.push_back(this1);
+      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,false);
+        }
+      if(numIds)
+        {
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp(numIds->selectByTupleIdSafe(pfl->begin(),pfl->end()));
+          ret2->setNumberIdsOnCells(tmp,false);
+        }
+      return ret2.retn();
+      
+    }
+  else
+    {
+      MEDCouplingAutoRefCountObjectPtr<MEDCMeshMultiLev> ret(new MEDCMeshMultiLev(*this));
+      if(nr)
+        { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+      return ret.retn();
     }
-  else
-    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)
+/*!
+ * \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
 {
-  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,meshSt));
-  //
-  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)
+  isInternal=_is_internal;
+  std::size_t sz(_coords.size());
+  std::vector< DataArrayDouble * > ret(sz);
+  for(std::size_t i=0;i<sz;i++)
     {
-      MEDFileField1TSStructItem this1(_already_checked[0].simplifyMeOnCellEntity(other));
-      ret=this1.isCompatibleWithNodesDiscr(other1,meshSt,other);
-      if(ret)
-        _already_checked.push_back(this1);
+      ret[i]=const_cast<DataArrayDouble *>((const DataArrayDouble *)_coords[i]);
+      ret[i]->incrRef();
     }
-  else
-    ret=_already_checked[found].isCompatibleWithNodesDiscr(other1,meshSt,other);
-  if(ret)
-    _already_checked.push_back(other1);
   return ret;
 }
 
-std::size_t MEDFileField1TSStruct::getHeapMemorySize() const
+//=
+
+MEDCurveLinearMeshMultiLev *MEDCurveLinearMeshMultiLev::New(const MEDFileCurveLinearMesh *m, const std::vector<int>& levs)
 {
-  std::size_t ret(0);
-  for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++)
-    ret+=(*it).getHeapMemorySize();
-  ret+=_already_checked.capacity()*sizeof(MEDFileField1TSStructItem);
-  return ret;
+  return new MEDCurveLinearMeshMultiLev(m,levs);
 }
 
-MEDFileField1TSStructItem MEDFileField1TSStruct::BuildItemFrom(const MEDFileAnyTypeField1TS *ref, const MEDFileMeshStruct *meshSt)
+MEDCurveLinearMeshMultiLev *MEDCurveLinearMeshMultiLev::New(const MEDFileCurveLinearMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities)
 {
-  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++)
-    {
-      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;
+  return new MEDCurveLinearMeshMultiLev(m,gts,pfls,nbEntities);
 }
 
-MEDMeshMultiLev *MEDFileField1TSStruct::buildFromScratchDataSetSupport(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDFileCurveLinearMesh *m, const std::vector<int>& levs):MEDStructuredMeshMultiLev(m,levs)
 {
-  if(_already_checked.empty())
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::buildFromScratchDataSetSupport : No outline structure in this !");
-  int pos0(-1),pos1(-1);
-  if(presenceOfCellDiscr(pos0))
-    {
-      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 -> level 0;
-          std::vector<int> levs(1,0);
-          return MEDMeshMultiLev::New(mst->getTheMesh(),levs);
-        }
-      else
-        return MEDMeshMultiLev::NewOnlyOnNode(mst->getTheMesh(),_already_checked[pos1][0].getPfl(globs));
-    }
+  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();
 }
 
-bool MEDFileField1TSStruct::isDataSetSupportFastlyEqualTo(const MEDFileField1TSStruct& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+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)
 {
-  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;
+  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 !");
+  int mdim(MEDCouplingStructuredMesh::GetGeoTypeGivenMeshDimension(m->getMeshDimension()));
+  if(mdim!=gts[0])
+    throw INTERP_KERNEL::Exception("MEDCurveLinearMeshMultiLev constructor 2 : the unique geo type is invalid regarding meshdim !");
+  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();
 }
 
-/*!
- * 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 throw(INTERP_KERNEL::Exception)
+MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDCurveLinearMeshMultiLev& other):MEDStructuredMeshMultiLev(other),_coords(other._coords),_structure(other._structure)
 {
-  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 throw(INTERP_KERNEL::Exception)
+std::vector<int> MEDCurveLinearMeshMultiLev::getNodeGridStructure() const
 {
-  int i(0);
-  for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++,i++)
+  return _structure;
+}
+
+MEDMeshMultiLev *MEDCurveLinearMeshMultiLev::prepare() const
+{
+  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)
     {
-      if((*it).getType()==ON_NODES)
+      std::vector< std::pair<int,int> > cellParts,nodeParts;
+      MEDCouplingAutoRefCountObjectPtr<MEDMeshMultiLev> ret2;
+      if(MEDCouplingStructuredMesh::IsPartStructured(pfl->begin(),pfl->end(),cgs,cellParts))
         {
-          std::size_t sz((*it).getNumberOfItems());
-          if(sz==1)
+          nodeParts=cellParts;
+          std::vector<int> st(ngs.size());
+          for(std::size_t i=0;i<ngs.size();i++)
             {
-              if(!(*it)[0].getPflName().empty())
-                { pos=i; return true; }
+              nodeParts[i].second++;
+              st[i]=nodeParts[i].second-nodeParts[i].first;
             }
-          else
-            throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::presenceOfPartialNodeDiscr : an element in this on entity NODE is split into several parts !");
+          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,false);
         }
+      if(numIds)
+        {
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp(numIds->selectByTupleIdSafe(pfl->begin(),pfl->end()));
+          ret2->setNumberIdsOnCells(tmp,false);
+        }
+      return ret2.retn();
     }
-  return false;
+  else
+    {
+      MEDCouplingAutoRefCountObjectPtr<MEDCurveLinearMeshMultiLev> ret(new MEDCurveLinearMeshMultiLev(*this));
+      if(nr)
+        { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+      return ret.retn();
+    }
+}
+
+void MEDCurveLinearMeshMultiLev::buildVTUArrays(DataArrayDouble *&coords, std::vector<int>& nodeStrct, bool& isInternal) const
+{
+  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();
 }
 
 //=
 
-MEDFileFastCellSupportComparator *MEDFileFastCellSupportComparator::New(const MEDFileMeshStruct *m, const MEDFileAnyTypeFieldMultiTS *ref) throw(INTERP_KERNEL::Exception)
+MEDFileField1TSStructItem2::MEDFileField1TSStructItem2()
 {
-  return new MEDFileFastCellSupportComparator(m,ref);
 }
 
-MEDFileFastCellSupportComparator::MEDFileFastCellSupportComparator(const MEDFileMeshStruct *m, const MEDFileAnyTypeFieldMultiTS *ref)
+MEDFileField1TSStructItem2::MEDFileField1TSStructItem2(INTERP_KERNEL::NormalizedCellType a, const std::pair<int,int>& b, const std::string& c, const std::string& d):_geo_type(a),_start_end(b),_pfl(DataArrayInt::New()),_loc(d),_nb_of_entity(-1)
 {
-  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,_mesh_comp);
-      _f1ts_cmps[i]->checkWithMeshStruct(_mesh_comp,elt);
-    }
+  _pfl->setName(c.c_str());
 }
 
-std::size_t MEDFileFastCellSupportComparator::getHeapMemorySize() const
+void MEDFileField1TSStructItem2::checkWithMeshStructForCells(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs)
 {
-  std::size_t ret(0);
-  const MEDFileMeshStruct *mst(_mesh_comp);
-  if(mst)
-    ret+=mst->getHeapMemorySize();
-  for(std::vector< MEDCouplingAutoRefCountObjectPtr<MEDFileField1TSStruct> >::const_iterator it=_f1ts_cmps.begin();it!=_f1ts_cmps.end();it++)
-    {
-      const MEDFileField1TSStruct *cur(*it);
-      if(cur)
-        ret+=cur->getHeapMemorySize()+sizeof(MEDFileField1TSStruct);
-    }
-  ret+=_f1ts_cmps.capacity()*sizeof(MEDCouplingAutoRefCountObjectPtr<MEDFileField1TSStruct>);
-  return ret;
+  int nbOfEnt=mst->getNumberOfElemsOfGeoType(_geo_type);
+  checkInRange(nbOfEnt,1,globs);
 }
 
-bool MEDFileFastCellSupportComparator::isEqual(const MEDFileAnyTypeFieldMultiTS *other) throw(INTERP_KERNEL::Exception)
+void MEDFileField1TSStructItem2::checkWithMeshStructForGaussNE(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs)
 {
-  int nbPts=other->getNumberOfTS();
-  if(nbPts!=(int)_f1ts_cmps.size())
+  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(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs)
+{
+  if(!globs)
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::checkWithMeshStructForGaussPT : no globals specified !");
+  if(_loc.empty())
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::checkWithMeshStructForGaussPT : no localization specified !");
+  const MEDFileFieldLoc& loc=globs->getLocalization(_loc.c_str());
+  int nbOfEnt=mst->getNumberOfElemsOfGeoType(_geo_type);
+  checkInRange(nbOfEnt,loc.getNumberOfGaussPoints(),globs);
+}
+
+int MEDFileField1TSStructItem2::getNbOfIntegrationPts(const MEDFileFieldGlobsReal *globs) const
+{
+  if(_loc.empty())
     {
-      std::ostringstream oss; oss << "MEDFileFastCellSupportComparator::isEqual : unexpected nb of time steps in  input ! Should be " << _f1ts_cmps.size() << " it is in reality " << nbPts << " !";
-      throw INTERP_KERNEL::Exception(oss.str().c_str());
+      if(getPflName().empty())
+        return (_start_end.second-_start_end.first)/_nb_of_entity;
+      else
+        return (_start_end.second-_start_end.first)/getPfl(globs)->getNumberOfTuples();
     }
-  for(int i=0;i<nbPts;i++)
+  else
     {
-      MEDCouplingAutoRefCountObjectPtr<MEDFileAnyTypeField1TS> elt=other->getTimeStepAtPos(i);
-      if(!_f1ts_cmps[i]->isEqualConsideringThePast(elt,_mesh_comp))
-        if(!_f1ts_cmps[i]->isSupportSameAs(elt,_mesh_comp))
-          return false;
+      const MEDFileFieldLoc& loc(globs->getLocalization(_loc.c_str()));
+      return loc.getNumberOfGaussPoints();
     }
-  return true;
 }
 
-bool MEDFileFastCellSupportComparator::isCompatibleWithNodesDiscr(const MEDFileAnyTypeFieldMultiTS *other) throw(INTERP_KERNEL::Exception)
+std::string MEDFileField1TSStructItem2::getPflName() const
+{
+  return _pfl->getName();
+}
+
+const DataArrayInt *MEDFileField1TSStructItem2::getPfl(const MEDFileFieldGlobsReal *globs) const
 {
-  int nbPts=other->getNumberOfTS();
-  if(nbPts!=(int)_f1ts_cmps.size())
-    {
-      std::ostringstream oss; oss << "MEDFileFastCellSupportComparator::isCompatibleWithNodesDiscr : unexpected nb of time steps in  input ! Should be " << _f1ts_cmps.size() << " it is in reality " << nbPts << " !";
-      throw INTERP_KERNEL::Exception(oss.str().c_str());
-    }
-  for(int i=0;i<nbPts;i++)
+  if(!_pfl->isAllocated())
     {
-      MEDCouplingAutoRefCountObjectPtr<MEDFileAnyTypeField1TS> elt=other->getTimeStepAtPos(i);
-      if(!_f1ts_cmps[i]->isCompatibleWithNodesDiscr(elt,_mesh_comp))
-        return false;
+      if(_pfl->getName().empty())
+        return 0;
+      else
+        return globs->getProfile(_pfl->getName().c_str());
     }
-  return true;
+  else
+    return _pfl;
 }
 
-MEDMeshMultiLev *MEDFileFastCellSupportComparator::buildFromScratchDataSetSupport(int timeStepId, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+/*!
+ * \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 MEDFileFieldGlobsReal *globs)
 {
-  if(timeStepId<0 || timeStepId>=(int)_f1ts_cmps.size())
+  _nb_of_entity=nbOfEntity;
+  if(_pfl->getName().empty())
     {
-      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());
+      if(nbOfEntity!=(_start_end.second-_start_end.first)/nip)
+        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::checkInRange : Mismatch between number of entities and size of node field !");
+      return ;
     }
-  const MEDFileField1TSStruct *obj(_f1ts_cmps[timeStepId]);
-  if(!obj)
+  else
     {
-      std::ostringstream oss; oss << "MEDFileFastCellSupportComparator::buildFromScratchDataSetSupport : at time step id #" << timeStepId << " no field structure overview defined !";
-      throw INTERP_KERNEL::Exception(oss.str().c_str());
+      if(!globs)
+        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::checkInRange : Presence of a profile on field whereas no globals found in file !");
+      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 !");
+      pfl->checkAllIdsInRange(0,nbOfEntity);
     }
-  return obj->buildFromScratchDataSetSupport(_mesh_comp,globs);
 }
 
-bool MEDFileFastCellSupportComparator::isDataSetSupportEqualToThePreviousOne(int timeStepId, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStructItem2::isFastlyEqual(int& startExp, INTERP_KERNEL::NormalizedCellType gt, const std::string& pflName) 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);
+  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 throw(INTERP_KERNEL::Exception)
+{
+  //_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();
+}
 
-std::size_t MEDMeshMultiLev::getHeapMemorySize() const
+bool MEDFileField1TSStructItem2::isCellSupportEqual(const MEDFileField1TSStructItem2& other, const MEDFileFieldGlobsReal *globs) const
 {
-  return 0;
+  if(_geo_type!=other._geo_type)
+    return false;
+  if(_nb_of_entity!=other._nb_of_entity)
+    return false;
+  if((_pfl->getName().empty() && !other._pfl->getName().empty()) || (!_pfl->getName().empty() && other._pfl->getName().empty()))
+    return false;
+  if(_pfl->getName().empty() && other._pfl->getName().empty())
+    return true;
+  const DataArrayInt *pfl1(getPfl(globs)),*pfl2(other.getPfl(globs));
+  return pfl1->isEqualWithoutConsideringStr(*pfl2);
 }
 
-MEDMeshMultiLev *MEDMeshMultiLev::New(const MEDFileMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStructItem2::isNodeSupportEqual(const MEDFileField1TSStructItem2& other, const MEDFileFieldGlobsReal *globs) const
 {
-  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] !");
+  return isCellSupportEqual(other,globs);
 }
 
-MEDMeshMultiLev *MEDMeshMultiLev::New(const MEDFileMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities) throw(INTERP_KERNEL::Exception)
+/*!
+ * \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 MEDFileFieldGlobsReal *globs)
 {
-  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] !");
+  if(objs.empty())
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::BuildAggregationOf : empty input !");
+  if(objs.size()==1)
+    return MEDFileField1TSStructItem2(*objs[0]);
+  INTERP_KERNEL::NormalizedCellType gt(objs[0]->_geo_type);
+  int nbEntityRef(objs[0]->_nb_of_entity);
+  std::size_t sz(objs.size());
+  std::vector<const DataArrayInt *> arrs(sz);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      const MEDFileField1TSStructItem2 *obj(objs[i]);
+      if(gt!=obj->_geo_type)
+        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::BuildAggregationOf : invalid situation ! All input must have the same geo type !");
+      if(nbEntityRef!=obj->_nb_of_entity)
+        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem2::BuildAggregationOf : invalid situation ! All input must have the global nb of entity !");
+      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(NEWLY_CREATED_PFL_NAME);
+      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;
+    }
 }
 
-MEDMeshMultiLev *MEDMeshMultiLev::NewOnlyOnNode(const MEDFileMesh *m, const DataArrayInt *pflOnNode) throw(INTERP_KERNEL::Exception)
+std::size_t MEDFileField1TSStructItem2::getHeapMemorySizeWithoutChildren() const
 {
-  std::vector<int> levs(1,0);
-  MEDCouplingAutoRefCountObjectPtr<MEDMeshMultiLev> ret(MEDMeshMultiLev::New(m,levs));
-  ret->selectPartOfNodes(pflOnNode);
-  return ret.retn();
+  std::size_t ret(_loc.capacity());
+  return ret;
 }
 
-void MEDMeshMultiLev::setNodeReduction(const DataArrayInt *nr)
+std::vector<const BigMemoryObject *> MEDFileField1TSStructItem2::getDirectChildren() const
 {
-  if(nr)
-    nr->incrRef();
-  _node_reduction=const_cast<DataArrayInt*>(nr);
+  std::vector<const BigMemoryObject *> ret;
+  const DataArrayInt *pfl(_pfl);
+  if(pfl)
+    ret.push_back(pfl);
+  return ret;
 }
 
-MEDMeshMultiLev::MEDMeshMultiLev()
+//=
+
+MEDFileField1TSStructItem::MEDFileField1TSStructItem(TypeOfField a, const std::vector< MEDFileField1TSStructItem2 >& b):_computed(false),_type(a),_items(b)
 {
 }
 
-MEDMeshMultiLev::MEDMeshMultiLev(const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):_geo_types(gts),_nb_entities(nbEntities)
+void MEDFileField1TSStructItem::checkWithMeshStruct(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs)
 {
-  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++)
+  switch(_type)
     {
-      if(pfls[i])
-        pfls[i]->incrRef();
-      _pfls[i]=const_cast<DataArrayInt *>(pfls[i]);
+    case ON_NODES:
+      {
+        int nbOfEnt=mst->getNumberOfNodes();
+        if(_items.size()!=1)
+          throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::checkWithMeshStruct : for nodes field only one subdivision supported !");
+        _items[0].checkInRange(nbOfEnt,1,globs);
+        break ;
+      }
+    case ON_CELLS:
+      {
+        for(std::vector< MEDFileField1TSStructItem2 >::iterator it=_items.begin();it!=_items.end();it++)
+          (*it).checkWithMeshStructForCells(mst,globs);
+        break;
+      }
+    case ON_GAUSS_NE:
+      {
+        for(std::vector< MEDFileField1TSStructItem2 >::iterator it=_items.begin();it!=_items.end();it++)
+          (*it).checkWithMeshStructForGaussNE(mst,globs);
+        break;
+      }
+    case ON_GAUSS_PT:
+      {
+        for(std::vector< MEDFileField1TSStructItem2 >::iterator it=_items.begin();it!=_items.end();it++)
+          (*it).checkWithMeshStructForGaussPT(mst,globs);
+        break;
+      }
+    default:
+      throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::checkWithMeshStruct : not managed field type !");
     }
 }
 
-MEDMeshMultiLev::MEDMeshMultiLev(const MEDMeshMultiLev& other):_pfls(other._pfls),_geo_types(other._geo_types),_nb_entities(other._nb_entities),_node_reduction(other._node_reduction)
+bool MEDFileField1TSStructItem::operator==(const MEDFileField1TSStructItem& other) const throw(INTERP_KERNEL::Exception)
 {
+  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]==other._items[i]))
+      return false;
+  return true;
 }
 
-//=
+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;
+}
 
-MEDUMeshMultiLev *MEDUMeshMultiLev::New(const MEDFileUMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStructItem::isNodeSupportEqual(const MEDFileField1TSStructItem& other, const MEDFileFieldGlobsReal *globs) const
 {
-  return new MEDUMeshMultiLev(m,levs);
+  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].isNodeSupportEqual(other._items[i],globs)))
+      return false;
+  return true;
 }
 
-MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDFileUMesh *m, const std::vector<int>& levs)
+bool MEDFileField1TSStructItem::isEntityCell() const
 {
-  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++)
+  if(_type==ON_NODES)
+    return false;
+  else
+    return true;
+}
+
+class CmpGeo
+{
+public:
+  CmpGeo(INTERP_KERNEL::NormalizedCellType geoTyp):_geo_type(geoTyp) { }
+  bool operator()(const std::pair< INTERP_KERNEL::NormalizedCellType, std::vector<std::size_t> > & v) const { return _geo_type==v.first; }
+private:
+  INTERP_KERNEL::NormalizedCellType _geo_type;
+};
+
+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 !");
+  std::vector< std::pair< INTERP_KERNEL::NormalizedCellType, std::vector<std::size_t> > > m;
+  std::size_t i=0;
+  for(std::vector< MEDFileField1TSStructItem2 >::const_iterator it=_items.begin();it!=_items.end();it++,i++)
+    {
+      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)));
+      else
+        (*it0).second.push_back(i);
+    }
+  if(m.size()==_items.size())
     {
-      std::vector<MEDCoupling1GTUMesh *> vTmp(m->getDirectUndergroundSingleGeoTypeMeshes(*it));
-      v.insert(v.end(),vTmp.begin(),vTmp.end());
+      MEDFileField1TSStructItem ret(*this);
+      ret._type=ON_CELLS;
+      return ret;
     }
-  std::size_t sz(v.size());
-  _parts.resize(sz);
-  _pfls.resize(sz);
-  _geo_types.resize(sz);
-  for(std::size_t i=0;i<sz;i++)
+  std::size_t sz(m.size());
+  std::vector< MEDFileField1TSStructItem2 > items(sz);
+  for(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();
+      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[ids[j]];
+      items[i]=MEDFileField1TSStructItem2::BuildAggregationOf(objs,globs);
     }
+  MEDFileField1TSStructItem ret(ON_CELLS,items);
+  ret._computed=true;
+  return ret;
 }
 
-MEDUMeshMultiLev *MEDUMeshMultiLev::New(const MEDFileUMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities) throw(INTERP_KERNEL::Exception)
+/*!
+ * \a this is expected to be ON_CELLS and simplified.
+ */
+bool MEDFileField1TSStructItem::isCompatibleWithNodesDiscr(const MEDFileField1TSStructItem& other, const MEDFileMeshStruct *meshSt, const MEDFileFieldGlobsReal *globs) const
 {
-  return new MEDUMeshMultiLev(m,gts,pfls,nbEntities);
+  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=isFullyOnOneLev(meshSt,theFirstLevFull);
+  const MEDFileField1TSStructItem2& otherNodeIt(other._items[0]);
+  if(otherNodeIt.getPflName().empty())
+    {//on all nodes
+      if(!ret0)
+        return false;
+      return theFirstLevFull==0;
+    }
+  else
+    {
+      const DataArrayInt *pfl=globs->getProfile(otherNodeIt.getPflName().c_str());
+      MEDCouplingAutoRefCountObjectPtr<DataArrayInt> cpyPfl(pfl->deepCpy());
+      cpyPfl->sort();
+      int nbOfNodes(meshSt->getNumberOfNodes());
+      if(cpyPfl->isIdentity() && cpyPfl->getNumberOfTuples()==nbOfNodes)
+        {//on all nodes also !
+          if(!ret0)
+            return false;
+          return theFirstLevFull==0;
+        }
+      std::vector<bool> nodesFetched(nbOfNodes,false);
+      meshSt->getTheMesh()->whichAreNodesFetched(*this,globs,nodesFetched);
+      return cpyPfl->isFittingWith(nodesFetched);
+    }
 }
 
-MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDFileUMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDMeshMultiLev(gts,pfls,nbEntities)
+bool MEDFileField1TSStructItem::isFullyOnOneLev(const MEDFileMeshStruct *meshSt, int& theFirstLevFull) const
 {
-  std::size_t sz(gts.size());
-  _parts.resize(sz);
-  for(std::size_t i=0;i<sz;i++)
+  if(_type!=ON_CELLS)
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnOneLev : works only for ON_CELLS discretization !");
+  if(_items.empty())
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnOneLev : items vector is empty !");
+  int nbOfLevs(meshSt->getNumberOfLevs());
+  if(nbOfLevs==0)
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnOneLev : no levels in input mesh structure !");
+  std::vector<int> levs(nbOfLevs);
+  theFirstLevFull=1;
+  std::set<INTERP_KERNEL::NormalizedCellType> gts;
+  for(std::vector< MEDFileField1TSStructItem2 >::const_iterator it=_items.begin();it!=_items.end();it++)
     {
-      MEDCoupling1GTUMesh *elt(m->getDirectUndergroundSingleGeoTypeMesh(gts[i]));
-      if(elt)
-        elt->incrRef();
-      _parts[i]=elt;
+      if(!(*it).getPflName().empty())
+        return false;
+      INTERP_KERNEL::NormalizedCellType gt((*it).getGeo());
+      if(gts.find(gt)!=gts.end())
+        throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::isFullyOnOneLev : internal error !");
+      gts.insert(gt);
+      int pos(meshSt->getLevelOfGeoType((*it).getGeo()));
+      levs[-pos]++;
     }
+  for(int i=0;i<nbOfLevs;i++)
+    if(meshSt->getNumberOfGeoTypesInLev(-i)==levs[i])
+      { theFirstLevFull=-i; return true; }
+  return false;
 }
 
-void MEDUMeshMultiLev::selectPartOfNodes(const DataArrayInt *pflNodes) throw(INTERP_KERNEL::Exception)
+const MEDFileField1TSStructItem2& MEDFileField1TSStructItem::operator[](std::size_t i) const throw(INTERP_KERNEL::Exception)
 {
-   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;
-       a[i]=m2->getNodeIdsInUse(tmp); aa[i]=a[i];
-       if(pfl)
-         _pfls[i]=pfl->selectByTupleIdSafe(cellIds->begin(),cellIds->end());
-       else
-         _pfls[i]=cellIdsSafe;
-     }
-   _node_reduction=DataArrayInt::Aggregate(aa);
-   _node_reduction->sort(true);
-   _node_reduction=_node_reduction->buildUnique();
+  if(i>=_items.size())
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::operator[] : input is not in valid range !");
+  return _items[i];
 }
 
-MEDMeshMultiLev *MEDUMeshMultiLev::prepare() const throw(INTERP_KERNEL::Exception)
+std::size_t MEDFileField1TSStructItem::getHeapMemorySizeWithoutChildren() const
 {
-  return new MEDUMeshMultiLev(*this);
+  std::size_t ret(_items.size()*sizeof(MEDFileField1TSStructItem2));
+  return ret;
 }
 
-MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDUMeshMultiLev& other):MEDMeshMultiLev(other),_parts(other._parts)
+std::vector<const BigMemoryObject *> MEDFileField1TSStructItem::getDirectChildren() 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;
 }
 
-MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDStructuredMeshMultiLev& other, const MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh>& part):MEDMeshMultiLev(other)
+MEDMeshMultiLev *MEDFileField1TSStructItem::buildFromScratchDataSetSupportOnCells(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) const
 {
-  _parts.resize(1);
-  _parts[0]=part;
+  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);
 }
 
-//=
-
-MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev()
+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;
 }
 
-MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDMeshMultiLev(gts,pfls,nbEntities)
-{
-}
+//=
 
-void MEDStructuredMeshMultiLev::selectPartOfNodes(const DataArrayInt *pflNodes) throw(INTERP_KERNEL::Exception)
+MEDFileField1TSStruct *MEDFileField1TSStruct::New(const MEDFileAnyTypeField1TS *ref, MEDFileMeshStruct *mst)
 {
-  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;
+  return new MEDFileField1TSStruct(ref,mst);
 }
 
-MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const MEDStructuredMeshMultiLev& other):MEDMeshMultiLev(other)
+MEDFileField1TSStruct::MEDFileField1TSStruct(const MEDFileAnyTypeField1TS *ref, MEDFileMeshStruct *mst)
 {
+  _already_checked.push_back(MEDFileField1TSStructItem::BuildItemFrom(ref,mst));
 }
 
-//=
-
-MEDCMeshMultiLev *MEDCMeshMultiLev::New(const MEDFileCMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
+void MEDFileField1TSStruct::checkWithMeshStruct(MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs)
 {
-  return new MEDCMeshMultiLev(m,levs);
+  if(_already_checked.empty())
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::checkWithMeshStruct : not correctly initialized !");
+  _already_checked.back().checkWithMeshStruct(mst,globs);
 }
 
-MEDCMeshMultiLev *MEDCMeshMultiLev::New(const MEDFileCMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities) throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStruct::isEqualConsideringThePast(const MEDFileAnyTypeField1TS *other, const MEDFileMeshStruct *mst) const
 {
-  return new MEDCMeshMultiLev(m,gts,pfls,nbEntities);
+  MEDFileField1TSStructItem b(MEDFileField1TSStructItem::BuildItemFrom(other,mst));
+  for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++)
+    {
+      if((*it)==b)
+        return true;
+    }
+  return false;
 }
 
-MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDFileCMesh *m, const std::vector<int>& levs)
+/*!
+ * 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, const MEDFileMeshStruct *meshSt)
 {
-  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 mdim(MEDCouplingStructuredMesh::GetGeoTypeGivenMeshDimension(m->getMeshDimension()));
-  _coords.resize(mdim);
-  for(int i=0;i<mdim;i++)
+  if(_already_checked.empty())
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::isSupportSameAs : no ref !");
+  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));
+  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)
     {
-      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;
+      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,other);
+  if(ret)
+    _already_checked.push_back(b);
+  return ret;
 }
 
-MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDFileCMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDStructuredMeshMultiLev(gts,pfls,nbEntities)
+/*!
+ * \param [in] other - a field with only one spatial discretization : ON_NODES.
+ */
+bool MEDFileField1TSStruct::isCompatibleWithNodesDiscr(const MEDFileAnyTypeField1TS *other, const MEDFileMeshStruct *meshSt)
 {
-  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(MEDCouplingStructuredMesh::GetGeoTypeGivenMeshDimension(m->getMeshDimension()));
-  if(mdim!=gts[0])
-    throw INTERP_KERNEL::Exception("MEDCMeshMultiLev constructor 2 : the unique geo type is invalid regarding meshdim !");
-  _coords.resize(mdim);
-  for(int i=0;i<mdim;i++)
+  if(_already_checked.empty())
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::isCompatibleWithNodesDiscr : no ref !");
+  MEDFileField1TSStructItem other1(MEDFileField1TSStructItem::BuildItemFrom(other,meshSt));
+  if(_already_checked[0].isEntityCell())
     {
-      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;
+      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(other1);
+      return ret;
     }
+  else
+    return _already_checked[0].isNodeSupportEqual(other1,other);
 }
 
-MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDCMeshMultiLev& other):MEDStructuredMeshMultiLev(other)
+std::size_t MEDFileField1TSStruct::getHeapMemorySizeWithoutChildren() const
 {
+  std::size_t ret(_already_checked.capacity()*sizeof(MEDFileField1TSStructItem));
+  return ret;
 }
 
-std::vector<int> MEDCMeshMultiLev::getNodeGridStructure() const throw(INTERP_KERNEL::Exception)
+std::vector<const BigMemoryObject *> MEDFileField1TSStruct::getDirectChildren() const
 {
-  std::vector<int> ret(_coords.size());
-  for(std::size_t i=0;i<_coords.size();i++)
-    ret[i]=_coords[i]->getNumberOfTuples();
+  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;
 }
 
-MEDMeshMultiLev *MEDCMeshMultiLev::prepare() const throw(INTERP_KERNEL::Exception)
+MEDMeshMultiLev *MEDFileField1TSStruct::buildFromScratchDataSetSupport(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) const
 {
-  const DataArrayInt *pfl(_pfls[0]),*nr(_node_reduction);
-  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)
+  if(_already_checked.empty())
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::buildFromScratchDataSetSupport : No outline structure in this !");
+  int pos0(-1),pos1(-1);
+  if(presenceOfCellDiscr(pos0))
     {
-      std::vector< std::pair<int,int> > cellParts;
-      if(MEDCouplingStructuredMesh::IsPartStructured(pfl->begin(),pfl->end(),cgs,cellParts))
-        {
-          MEDCouplingAutoRefCountObjectPtr<MEDCMeshMultiLev> ret(new MEDCMeshMultiLev(*this));
-          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;
-          return ret.retn();
+      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;
+}
+
+/*!
+ * 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)
         {
-          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); }
-          return ret.retn();
+          ret=true;
+          std::size_t sz((*it).getNumberOfItems());
+          if(refSz>sz)
+            { pos=i; refSz=sz; }
         }
     }
-  else
+  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++)
     {
-      MEDCouplingAutoRefCountObjectPtr<MEDCMeshMultiLev> ret(new MEDCMeshMultiLev(*this));
-      if(nr)
-        { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
-      return ret.retn();
+      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::presenceOfPartialNodeDiscr : an element in this on entity NODE is split into several parts !");
+        }
     }
+  return false;
 }
 
 //=
 
-MEDCurveLinearMeshMultiLev *MEDCurveLinearMeshMultiLev::New(const MEDFileCurveLinearMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
+MEDFileFastCellSupportComparator *MEDFileFastCellSupportComparator::New(const MEDFileMeshStruct *m, const MEDFileAnyTypeFieldMultiTS *ref)
 {
-  return new MEDCurveLinearMeshMultiLev(m,levs);
+  return new MEDFileFastCellSupportComparator(m,ref);
 }
 
-MEDCurveLinearMeshMultiLev *MEDCurveLinearMeshMultiLev::New(const MEDFileCurveLinearMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities) throw(INTERP_KERNEL::Exception)
+MEDFileFastCellSupportComparator::MEDFileFastCellSupportComparator(const MEDFileMeshStruct *m, const MEDFileAnyTypeFieldMultiTS *ref)
 {
-  return new MEDCurveLinearMeshMultiLev(m,gts,pfls,nbEntities);
+  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,_mesh_comp);
+      _f1ts_cmps[i]->checkWithMeshStruct(_mesh_comp,elt);
+    }
 }
 
-MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDFileCurveLinearMesh *m, const std::vector<int>& levs)
+std::size_t MEDFileFastCellSupportComparator::getHeapMemorySizeWithoutChildren() const
 {
-  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();
+  std::size_t ret(_f1ts_cmps.capacity()*sizeof(MEDCouplingAutoRefCountObjectPtr<MEDFileField1TSStruct>));
+  return ret;
 }
 
-MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDFileCurveLinearMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDStructuredMeshMultiLev(gts,pfls,nbEntities)
+std::vector<const BigMemoryObject *> MEDFileFastCellSupportComparator::getDirectChildren() const
 {
-  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 !");
-  int mdim(MEDCouplingStructuredMesh::GetGeoTypeGivenMeshDimension(m->getMeshDimension()));
-  if(mdim!=gts[0])
-    throw INTERP_KERNEL::Exception("MEDCurveLinearMeshMultiLev constructor 2 : the unique geo type is invalid regarding meshdim !");
-  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();
+  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++)
+    {
+      const MEDFileField1TSStruct *cur(*it);
+      if(cur)
+        ret.push_back(cur);
+    }
+  return ret;
 }
 
-MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDCurveLinearMeshMultiLev& other):MEDStructuredMeshMultiLev(other),_coords(other._coords),_structure(other._structure)
+bool MEDFileFastCellSupportComparator::isEqual(const MEDFileAnyTypeFieldMultiTS *other)
 {
+  int nbPts=other->getNumberOfTS();
+  if(nbPts!=(int)_f1ts_cmps.size())
+    {
+      std::ostringstream oss; oss << "MEDFileFastCellSupportComparator::isEqual : unexpected nb of time steps in  input ! Should be " << _f1ts_cmps.size() << " it is in reality " << nbPts << " !";
+      throw INTERP_KERNEL::Exception(oss.str().c_str());
+    }
+  for(int i=0;i<nbPts;i++)
+    {
+      MEDCouplingAutoRefCountObjectPtr<MEDFileAnyTypeField1TS> elt=other->getTimeStepAtPos(i);
+      if(!_f1ts_cmps[i]->isEqualConsideringThePast(elt,_mesh_comp))
+        if(!_f1ts_cmps[i]->isSupportSameAs(elt,_mesh_comp))
+          return false;
+    }
+  return true;
 }
 
-std::vector<int> MEDCurveLinearMeshMultiLev::getNodeGridStructure() const throw(INTERP_KERNEL::Exception)
+bool MEDFileFastCellSupportComparator::isCompatibleWithNodesDiscr(const MEDFileAnyTypeFieldMultiTS *other)
 {
-  return _structure;
+  int nbPts=other->getNumberOfTS();
+  if(nbPts!=(int)_f1ts_cmps.size())
+    {
+      std::ostringstream oss; oss << "MEDFileFastCellSupportComparator::isCompatibleWithNodesDiscr : unexpected nb of time steps in  input ! Should be " << _f1ts_cmps.size() << " it is in reality " << nbPts << " !";
+      throw INTERP_KERNEL::Exception(oss.str().c_str());
+    }
+  for(int i=0;i<nbPts;i++)
+    {
+      MEDCouplingAutoRefCountObjectPtr<MEDFileAnyTypeField1TS> elt=other->getTimeStepAtPos(i);
+      if(!_f1ts_cmps[i]->isCompatibleWithNodesDiscr(elt,_mesh_comp))
+        return false;
+    }
+  return true;
 }
 
-MEDMeshMultiLev *MEDCurveLinearMeshMultiLev::prepare() const throw(INTERP_KERNEL::Exception)
+MEDMeshMultiLev *MEDFileFastCellSupportComparator::buildFromScratchDataSetSupport(int timeStepId, const MEDFileFieldGlobsReal *globs) const
 {
-  const DataArrayInt *pfl(_pfls[0]),*nr(_node_reduction);
-  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)
+  if(timeStepId<0 || timeStepId>=(int)_f1ts_cmps.size())
     {
-      std::vector< std::pair<int,int> > cellParts,nodeParts;
-      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));
-          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;
-          return ret.retn();
-        }
-      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); }
-          return ret.retn();
-        }
+      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());
     }
-  else
+  const MEDFileField1TSStruct *obj(_f1ts_cmps[timeStepId]);
+  if(!obj)
     {
-      MEDCouplingAutoRefCountObjectPtr<MEDCurveLinearMeshMultiLev> ret(new MEDCurveLinearMeshMultiLev(*this));
-      if(nr)
-        { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
-      return ret.retn();
+      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);
 }