From: ageay <ageay>
Date: Fri, 26 Jul 2013 08:26:29 +0000 (+0000)
Subject: MEDReader ready -> let's debug
X-Git-Tag: V7_3_1b1~278
X-Git-Url: http://git.salome-platform.org/gitweb/?a=commitdiff_plain;h=86d79fbc101332e3eebd5cc765e974f38228007d;p=tools%2Fmedcoupling.git

MEDReader ready -> let's debug
---

diff --git a/src/MEDLoader/MEDFileFieldOverView.cxx b/src/MEDLoader/MEDFileFieldOverView.cxx
index 4f099caa1..2552ebd47 100644
--- a/src/MEDLoader/MEDFileFieldOverView.cxx
+++ b/src/MEDLoader/MEDFileFieldOverView.cxx
@@ -107,1483 +107,1525 @@ int MEDFileMeshStruct::getNumberOfGeoTypesInLev(int relativeLev) const throw(INT
 
 //=
 
-MEDFileField1TSStructItem2::MEDFileField1TSStructItem2()
+std::size_t MEDMeshMultiLev::getHeapMemorySize() 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)
+MEDMeshMultiLev *MEDMeshMultiLev::New(const MEDFileMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
 {
-  _pfl->setName(c.c_str());
+  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::checkWithMeshStructForCells(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) throw(INTERP_KERNEL::Exception)
 {
-  int nbOfEnt=mst->getNumberOfElemsOfGeoType(_geo_type);
-  checkInRange(nbOfEnt,1,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::checkWithMeshStructForGaussNE(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
+MEDMeshMultiLev *MEDMeshMultiLev::NewOnlyOnNode(const MEDFileMesh *m, const DataArrayInt *pflOnNode) throw(INTERP_KERNEL::Exception)
 {
-  int nbOfEnt=mst->getNumberOfElemsOfGeoType(_geo_type);
-  const INTERP_KERNEL::CellModel& cm=INTERP_KERNEL::CellModel::GetCellModel(_geo_type);
-  checkInRange(nbOfEnt,(int)cm.getNumberOfNodes(),globs);
+  std::vector<int> levs(1,0);
+  MEDCouplingAutoRefCountObjectPtr<MEDMeshMultiLev> ret(MEDMeshMultiLev::New(m,levs));
+  ret->selectPartOfNodes(pflOnNode);
+  return ret.retn();
 }
 
-void MEDFileField1TSStructItem2::checkWithMeshStructForGaussPT(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
+void MEDMeshMultiLev::setNodeReduction(const DataArrayInt *nr)
 {
-  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);
+  if(nr)
+    nr->incrRef();
+  _node_reduction=const_cast<DataArrayInt*>(nr);
 }
 
-int MEDFileField1TSStructItem2::getNbOfIntegrationPts(const MEDFileFieldGlobsReal *globs) const
+bool MEDMeshMultiLev::isFastlyTheSameStruct(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
 {
-  if(_loc.empty())
+  if(fst.getType()==ON_NODES)
     {
-      if(getPflName().empty())
-        return (_start_end.second-_start_end.first)/_nb_of_entity;
-      else
-        return (_start_end.second-_start_end.first)/getPfl(globs)->getNumberOfTuples();
+      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
     {
-      const MEDFileFieldLoc& loc(globs->getLocalization(_loc.c_str()));
-      return loc.getNumberOfGaussPoints();
+      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;
     }
 }
 
-std::string MEDFileField1TSStructItem2::getPflName() const
+DataArray *MEDMeshMultiLev::buildDataArray(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs, const DataArray *vals) const throw(INTERP_KERNEL::Exception)
 {
-  return _pfl->getName();
+  MEDCouplingAutoRefCountObjectPtr<DataArray> ret(const_cast<DataArray *>(vals)); ret->incrRef();
+  if(isFastlyTheSameStruct(fst,globs))
+    return ret.retn();
+  else
+    return constructDataArray(fst,globs,vals);
 }
 
-const DataArrayInt *MEDFileField1TSStructItem2::getPfl(const MEDFileFieldGlobsReal *globs) const
+std::string MEDMeshMultiLev::getPflNameOfId(int id) const
 {
-  if(!_pfl->isAllocated())
-    {
-      if(_pfl->getName().empty())
-        return 0;
-      else
-        return globs->getProfile(_pfl->getName().c_str());
-    }
-  else
-    return _pfl;
+  std::size_t sz(_pfls.size());
+  if(id<0 || id>=sz)
+    throw INTERP_KERNEL::Exception("MEDMeshMultiLev::getPflNameOfId : invalid input id !");
+  const DataArrayInt *pfl(_pfls[id]);
+  if(!pfl)
+    return std::string("");
+  return pfl->getName();
 }
 
-/*!
- * \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) throw(INTERP_KERNEL::Exception)
+DataArray *MEDMeshMultiLev::constructDataArray(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs, const DataArray *vals) const throw(INTERP_KERNEL::Exception)
 {
-  _nb_of_entity=nbOfEntity;
-  if(_pfl->getName().empty())
+  if(fst.getType()==ON_NODES)
     {
-      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 ;
+      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 : unexpected situation for nodes 3 !");
+          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()!=p.getNbEntity())
+            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
     {
-      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);
+      std::size_t sz(fst.getNumberOfItems());
+      std::vector< MEDCouplingAutoRefCountObjectPtr<DataArray> > arrSafe(sz);
+      std::vector< const DataArray *> arr(sz);
+      for(std::size_t i=0;i<sz;i++)
+        {
+          const MEDFileField1TSStructItem2& p(fst[i]);
+          const std::pair<int,int>& strtStop(p.getStartStop());
+          std::vector< INTERP_KERNEL::NormalizedCellType >::const_iterator it(std::find(_geo_types.begin(),_geo_types.end(),p.getGeo()));
+          if(it==_geo_types.end())
+            throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 1 !");
+          if(std::find(it+1,_geo_types.end(),p.getGeo())!=_geo_types.end())
+            throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 2 !");
+          std::size_t pos(std::distance(_geo_types.begin(),it));
+          const DataArrayInt *thisP(_pfls[pos]),*otherP(p.getPfl(globs));
+          MEDCouplingAutoRefCountObjectPtr<DataArray> ret(vals->selectByTupleId2(strtStop.first,strtStop.second,1));
+          if(!thisP && !otherP)
+            {
+              arrSafe[i]=ret; arr[i]=ret;
+              continue;
+            }
+          int nbi(p.getNbOfIntegrationPts(globs)),nc(ret->getNumberOfComponents());
+          if(!thisP && otherP)
+            {
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(otherP->deepCpy());
+              p1->sort(true);
+              if(!p1->isIdentity() || p1->getNumberOfTuples()!=p.getNbEntity())
+                throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 3 !");
+              ret->rearrange(nbi*nc); ret->renumberInPlace(otherP->begin()); ret->rearrange(nc);
+              arrSafe[i]=ret; arr[i]=ret;
+              continue;
+            }
+          if(thisP && otherP)
+            {
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(otherP->deepCpy());
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p2(thisP->deepCpy());
+              p1->sort(true); p2->sort(true);
+              if(!p1->isEqualWithoutConsideringStr(*p2))
+                throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 4 !");
+              p1=DataArrayInt::FindPermutationFromFirstToSecond(otherP,thisP);
+              ret->rearrange(nbi*nc); ret->renumberInPlace(p1->begin()); ret->rearrange(nc);
+              continue;
+            }
+          if(thisP && !otherP)
+            {
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(thisP->deepCpy());
+              p1->sort(true);
+              if(!p1->isIdentity() || p1->getNumberOfTuples()!=p.getNbEntity())
+                throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 3 !");
+              ret->rearrange(nbi*nc); ret->renumberInPlaceR(otherP->begin()); ret->rearrange(nc);
+              arrSafe[i]=ret; arr[i]=ret;
+              continue;
+            }
+          throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 6 !");
+        }
+      return DataArray::Aggregate(arr);
     }
 }
 
-bool MEDFileField1TSStructItem2::isFastlyEqual(int& startExp, INTERP_KERNEL::NormalizedCellType gt, const char *pflName) const
+MEDMeshMultiLev::MEDMeshMultiLev()
 {
-  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)
+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)
 {
-  //_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 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]);
+    }
 }
 
-bool MEDFileField1TSStructItem2::isCellSupportEqual(const MEDFileField1TSStructItem2& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+MEDMeshMultiLev::MEDMeshMultiLev(const MEDMeshMultiLev& other):_pfls(other._pfls),_geo_types(other._geo_types),_nb_entities(other._nb_entities),_node_reduction(other._node_reduction)
 {
-  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);
 }
 
-bool MEDFileField1TSStructItem2::isNodeSupportEqual(const MEDFileField1TSStructItem2& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
-{
-  return isCellSupportEqual(other,globs);
+//=
+
+MEDUMeshMultiLev *MEDUMeshMultiLev::New(const MEDFileUMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
+{
+  return new MEDUMeshMultiLev(m,levs);
 }
 
-/*!
- * \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) throw(INTERP_KERNEL::Exception)
+MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDFileUMesh *m, const std::vector<int>& levs)
 {
-  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)
+  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::pair<int,int> p(0,nbEntityRef);
-      std::string a,b;
-      MEDFileField1TSStructItem2 ret(gt,p,a,b);
-      ret._nb_of_entity=nbEntityRef;
-      return ret;
+      std::vector<MEDCoupling1GTUMesh *> vTmp(m->getDirectUndergroundSingleGeoTypeMeshes(*it));
+      v.insert(v.end(),vTmp.begin(),vTmp.end());
     }
-  else
+  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++)
     {
-      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;
+      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();
     }
 }
 
-std::size_t MEDFileField1TSStructItem2::getHeapMemorySize() const
-{
-  std::size_t ret(0);
-  const DataArrayInt *pfl(_pfl);
-  if(pfl)
-    ret+=pfl->getHeapMemorySize();
-  ret+=_loc.capacity();
-  return ret;
-}
-
-//=
-
-MEDFileField1TSStructItem::MEDFileField1TSStructItem(TypeOfField a, const std::vector< MEDFileField1TSStructItem2 >& b):_computed(false),_type(a),_items(b)
+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)
 {
+  return new MEDUMeshMultiLev(m,gts,pfls,nbEntities);
 }
 
-void MEDFileField1TSStructItem::checkWithMeshStruct(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
+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)
 {
-  switch(_type)
+  std::size_t sz(gts.size());
+  _parts.resize(sz);
+  for(std::size_t i=0;i<sz;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 !");
+      MEDCoupling1GTUMesh *elt(m->getDirectUndergroundSingleGeoTypeMesh(gts[i]));
+      if(elt)
+        elt->incrRef();
+      _parts[i]=elt;
     }
 }
 
-bool MEDFileField1TSStructItem::operator==(const MEDFileField1TSStructItem& other) const throw(INTERP_KERNEL::Exception)
+void MEDUMeshMultiLev::selectPartOfNodes(const DataArrayInt *pflNodes) 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;
+   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();
 }
 
-bool MEDFileField1TSStructItem::isCellSupportEqual(const MEDFileField1TSStructItem& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+MEDMeshMultiLev *MEDUMeshMultiLev::prepare() 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].isCellSupportEqual(other._items[i],globs)))
-      return false;
-  return true;
+  return new MEDUMeshMultiLev(*this);
 }
 
-bool MEDFileField1TSStructItem::isNodeSupportEqual(const MEDFileField1TSStructItem& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDUMeshMultiLev& other):MEDMeshMultiLev(other),_parts(other._parts)
 {
-  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;
 }
 
-bool MEDFileField1TSStructItem::isEntityCell() const
+MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDStructuredMeshMultiLev& other, const MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh>& part):MEDMeshMultiLev(other)
 {
-  if(_type==ON_NODES)
-    return false;
-  else
-    return true;
+  _parts.resize(1);
+  _parts[0]=part;
 }
 
-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)
+void MEDUMeshMultiLev::buildVTUArrays(DataArrayDouble *& coords, DataArrayByte *&types, DataArrayInt *&cellLocations, DataArrayInt *& cells, DataArrayInt *&faceLocations, DataArrayInt *&faces) const throw(INTERP_KERNEL::Exception)
 {
-  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(_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);
+  for(std::vector< MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> >::const_iterator it=_parts.begin();it!=_parts.end();it++)
     {
-      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)));
+      const MEDCoupling1GTUMesh *cur(*it);
+      if(!cur)
+        throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : a part is null !");
+      int curNbCells(cur->getNumberOfCells());
+      szBCE+=curNbCells;
+      if((*it)->getCellModelEnum()!=INTERP_KERNEL::NORM_POLYHED)
+        szD=(*it)->getNodalConnectivity()->getNumberOfTuples()+curNbCells;
       else
-        (*it0).second.push_back(i);
-    }
-  if(m.size()==_items.size())
-    {
-      MEDFileField1TSStructItem ret(*this);
-      ret._type=ON_CELLS;
-      return ret;
+        {
+          isPolyh=true;
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp((*it)->computeEffectiveNbOfNodesPerCell());
+          szD+=tmp->accumulate(0)+curNbCells;
+          szF+=2*curNbCells+(*it)->getNodalConnectivity()->getNumberOfTuples();
+        }
     }
-  std::size_t sz(m.size());
-  std::vector< MEDFileField1TSStructItem2 > items(sz);
-  for(i=0;i<sz;i++)
+  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);
+  for(std::vector< MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> >::const_iterator it=_parts.begin();it!=_parts.end();it++)
     {
-      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;
+      const MEDCoupling1GTUMesh *cur(*it);
+      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==-1)
+        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+nnpc; k=*cPtr++;
+            }
+          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+connIPtr[1]-connIPtr[0]; k=*cPtr++;
+                }
+            }
+          else
+            {
+              for(int i=0;i<curNbCells;i++,connIPtr++)
+                {
+                  std::set<int> s(connPtr+connIPtr[0],connPtr+connIPtr[1]);
+                  *dPtr++=(int)s.size();
+                  dPtr=std::copy(s.begin(),s.end(),dPtr);
+                  *cPtr=k+(int)s.size(); k=*cPtr++;
+                }
+            }
+          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);
+  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(); }
 }
 
-/*!
- * \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)
+void MEDUMeshMultiLev::reorderNodesIfNecessary(DataArrayDouble *coords, DataArrayInt *nodalConnVTK, DataArrayInt *polyhedNodalConnVTK) const throw(INTERP_KERNEL::Exception)
 {
-  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;
+  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)
+    {
+      int nb(*work++);
+      for(int i=0;i<nb && work!=endW;i++,work++)
+        {
+          if(*work>=0 && *work<sz)
+            b[sz]=true;
+          else
+            throw INTERP_KERNEL::Exception("MEDStructuredMeshMultiLev::reorderNodesIfNecessary : internal error !");
+        }
     }
-  else
+  if(polyhedNodalConnVTK)
     {
-      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;
+      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[sz]=true;
+                  else
+                    throw INTERP_KERNEL::Exception("MEDStructuredMeshMultiLev::reorderNodesIfNecessary : internal error #2 !");
+                }
+            }
         }
-      std::vector<bool> nodesFetched(nbOfNodes,false);
-      meshSt->getTheMesh()->whichAreNodesFetched(*this,globs,nodesFetched);
-      return cpyPfl->isFittingWith(nodesFetched);
     }
-}
-
-bool MEDFileField1TSStructItem::isFullyOnOneLev(const MEDFileMeshStruct *meshSt, int& theFirstLevFull) const throw(INTERP_KERNEL::Exception)
-{
-  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++)
+  int szExp(std::count(b.begin(),b.end(),true));
+  if(szExp!=nr->getNumberOfTuples())
+    throw INTERP_KERNEL::Exception("MEDStructuredMeshMultiLev::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)
     {
-      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]++;
+      int nb(*work2++);
+      for(int i=0;i<nb && work2!=endW2;i++,work2++)
+        *work2=permPtr[o2nPtrc[*work2]];
     }
-  for(int i=0;i<nbOfLevs;i++)
-    if(meshSt->getNumberOfGeoTypesInLev(-i)==levs[i])
-      { theFirstLevFull=-i; return true; }
-  return false;
+  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]];
+            }
+        }
+    }
+  MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> coo(coords->selectByTupleIdSafe(nr->begin(),nr->end()));
+  coords->cpyFrom(*coo);
 }
 
-const MEDFileField1TSStructItem2& MEDFileField1TSStructItem::operator[](std::size_t i) const throw(INTERP_KERNEL::Exception)
+//=
+
+MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev()
 {
-  if(i<0 || i>=_items.size())
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::operator[] : input is not in valid range !");
-  return _items[i];
 }
 
-std::size_t MEDFileField1TSStructItem::getHeapMemorySize() const
+MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDMeshMultiLev(gts,pfls,nbEntities)
 {
-  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) throw(INTERP_KERNEL::Exception)
 {
-  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)
+MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const MEDStructuredMeshMultiLev& other):MEDMeshMultiLev(other)
 {
-  return new MEDFileField1TSStruct(ref,mst);
 }
 
-MEDFileField1TSStruct::MEDFileField1TSStruct(const MEDFileAnyTypeField1TS *ref, MEDFileMeshStruct *mst)
+//=
+
+MEDCMeshMultiLev *MEDCMeshMultiLev::New(const MEDFileCMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
 {
-  _already_checked.push_back(BuildItemFrom(ref,mst));
+  return new MEDCMeshMultiLev(m,levs);
 }
 
-void MEDFileField1TSStruct::checkWithMeshStruct(MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
+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)
 {
-  if(_already_checked.empty())
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::checkWithMeshStruct : not correctly initialized !");
-  _already_checked.back().checkWithMeshStruct(mst,globs);
+  return new MEDCMeshMultiLev(m,gts,pfls,nbEntities);
 }
 
-bool MEDFileField1TSStruct::isEqualConsideringThePast(const MEDFileAnyTypeField1TS *other, const MEDFileMeshStruct *mst) const throw(INTERP_KERNEL::Exception)
+MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDFileCMesh *m, const std::vector<int>& levs)
 {
-  MEDFileField1TSStructItem b(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;
-}
-
-/*!
- * 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)
-{
-  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)
+  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++)
     {
-      MEDFileField1TSStructItem this1(_already_checked[0].simplifyMeOnCellEntity(other));
-      ret=this1.isCellSupportEqual(other1,other);
-      if(ret)
-        _already_checked.push_back(this1);
+      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;
     }
-  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)
+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)
 {
-  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)
+  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++)
     {
-      MEDFileField1TSStructItem this1(_already_checked[0].simplifyMeOnCellEntity(other));
-      ret=this1.isCompatibleWithNodesDiscr(other1,meshSt,other);
-      if(ret)
-        _already_checked.push_back(this1);
+      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;
     }
-  else
-    ret=_already_checked[found].isCompatibleWithNodesDiscr(other1,meshSt,other);
-  if(ret)
-    _already_checked.push_back(other1);
-  return ret;
 }
 
-std::size_t MEDFileField1TSStruct::getHeapMemorySize() const
+MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDCMeshMultiLev& other):MEDStructuredMeshMultiLev(other)
 {
-  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;
 }
 
-MEDFileField1TSStructItem MEDFileField1TSStruct::BuildItemFrom(const MEDFileAnyTypeField1TS *ref, const MEDFileMeshStruct *meshSt)
+std::vector<int> MEDCMeshMultiLev::getNodeGridStructure() const throw(INTERP_KERNEL::Exception)
 {
-  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);
+  std::vector<int> ret(_coords.size());
+  for(std::size_t i=0;i<_coords.size();i++)
+    ret[i]=_coords[i]->getNumberOfTuples();
   return ret;
 }
 
-MEDMeshMultiLev *MEDFileField1TSStruct::buildFromScratchDataSetSupport(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+MEDMeshMultiLev *MEDCMeshMultiLev::prepare() const throw(INTERP_KERNEL::Exception)
 {
-  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
+  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(!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);
+      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();
         }
       else
-        return MEDMeshMultiLev::NewOnlyOnNode(mst->getTheMesh(),_already_checked[pos1][0].getPfl(globs));
-    }
-}
-
-bool MEDFileField1TSStruct::isDataSetSupportFastlyEqualTo(const MEDFileField1TSStruct& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
-{
-  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 throw(INTERP_KERNEL::Exception)
-{
-  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; }
+          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();
         }
     }
-  if(refSz==0)
-    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::presenceOfCellDiscr : an element in this on entity CELL is empty !");
-  return ret;
+  else
+    {
+      MEDCouplingAutoRefCountObjectPtr<MEDCMeshMultiLev> ret(new MEDCMeshMultiLev(*this));
+      if(nr)
+        { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+      return ret.retn();
+    }
 }
 
-/*!
- * 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< DataArrayDouble * > MEDCMeshMultiLev::buildVTUArrays() const throw(INTERP_KERNEL::Exception)
 {
-  int i(0);
-  for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++,i++)
+  std::size_t sz(_coords.size());
+  std::vector< DataArrayDouble * > ret(sz);
+  for(std::size_t i=0;i<sz;i++)
     {
-      if((*it).getType()==ON_NODES)
-        {
-          std::size_t sz((*it).getNumberOfItems());
-          if(sz==1)
-            {
-              if(!(*it)[0].getPflName().empty())
-                { pos=i; return true; }
-            }
-          else
-            throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::presenceOfPartialNodeDiscr : an element in this on entity NODE is split into several parts !");
-        }
+      ret[i]=const_cast<DataArrayDouble *>((const DataArrayDouble *)_coords[i]);
+      ret[i]->incrRef();
     }
-  return false;
+  return ret;
 }
 
 //=
 
-MEDFileFastCellSupportComparator *MEDFileFastCellSupportComparator::New(const MEDFileMeshStruct *m, const MEDFileAnyTypeFieldMultiTS *ref) throw(INTERP_KERNEL::Exception)
+MEDCurveLinearMeshMultiLev *MEDCurveLinearMeshMultiLev::New(const MEDFileCurveLinearMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
 {
-  return new MEDFileFastCellSupportComparator(m,ref);
+  return new MEDCurveLinearMeshMultiLev(m,levs);
 }
 
-MEDFileFastCellSupportComparator::MEDFileFastCellSupportComparator(const MEDFileMeshStruct *m, const MEDFileAnyTypeFieldMultiTS *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)
 {
-  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);
-    }
+  return new MEDCurveLinearMeshMultiLev(m,gts,pfls,nbEntities);
 }
 
-std::size_t MEDFileFastCellSupportComparator::getHeapMemorySize() const
+MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDFileCurveLinearMesh *m, const std::vector<int>& levs)
 {
-  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;
+  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 MEDFileFastCellSupportComparator::isEqual(const MEDFileAnyTypeFieldMultiTS *other) 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(gts,pfls,nbEntities)
 {
-  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;
+  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();
 }
 
-bool MEDFileFastCellSupportComparator::isCompatibleWithNodesDiscr(const MEDFileAnyTypeFieldMultiTS *other) throw(INTERP_KERNEL::Exception)
+MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDCurveLinearMeshMultiLev& other):MEDStructuredMeshMultiLev(other),_coords(other._coords),_structure(other._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 *MEDFileFastCellSupportComparator::buildFromScratchDataSetSupport(int timeStepId, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+std::vector<int> MEDCurveLinearMeshMultiLev::getNodeGridStructure() const throw(INTERP_KERNEL::Exception)
 {
-  if(timeStepId<0 || timeStepId>=(int)_f1ts_cmps.size())
+  return _structure;
+}
+
+MEDMeshMultiLev *MEDCurveLinearMeshMultiLev::prepare() const throw(INTERP_KERNEL::Exception)
+{
+  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)
     {
-      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());
+      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();
+        }
     }
-  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());
+      MEDCouplingAutoRefCountObjectPtr<MEDCurveLinearMeshMultiLev> ret(new MEDCurveLinearMeshMultiLev(*this));
+      if(nr)
+        { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+      return ret.retn();
     }
-  return obj->buildFromScratchDataSetSupport(_mesh_comp,globs);
 }
 
-bool MEDFileFastCellSupportComparator::isDataSetSupportEqualToThePreviousOne(int timeStepId, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+void MEDCurveLinearMeshMultiLev::buildVTUArrays(DataArrayDouble *&coords, std::vector<int>& nodeStrct) const throw(INTERP_KERNEL::Exception)
 {
-  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);
+  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();
 }
 
 //=
 
-std::size_t MEDMeshMultiLev::getHeapMemorySize() const
+MEDFileField1TSStructItem2::MEDFileField1TSStructItem2()
 {
-  return 0;
 }
 
-MEDMeshMultiLev *MEDMeshMultiLev::New(const MEDFileMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
+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("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] !");
+  _pfl->setName(c.c_str());
 }
 
-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)
+void MEDFileField1TSStructItem2::checkWithMeshStructForCells(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
 {
-  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] !");
+  int nbOfEnt=mst->getNumberOfElemsOfGeoType(_geo_type);
+  checkInRange(nbOfEnt,1,globs);
 }
 
-MEDMeshMultiLev *MEDMeshMultiLev::NewOnlyOnNode(const MEDFileMesh *m, const DataArrayInt *pflOnNode) throw(INTERP_KERNEL::Exception)
+void MEDFileField1TSStructItem2::checkWithMeshStructForGaussNE(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
 {
-  std::vector<int> levs(1,0);
-  MEDCouplingAutoRefCountObjectPtr<MEDMeshMultiLev> ret(MEDMeshMultiLev::New(m,levs));
-  ret->selectPartOfNodes(pflOnNode);
-  return ret.retn();
+  int nbOfEnt=mst->getNumberOfElemsOfGeoType(_geo_type);
+  const INTERP_KERNEL::CellModel& cm=INTERP_KERNEL::CellModel::GetCellModel(_geo_type);
+  checkInRange(nbOfEnt,(int)cm.getNumberOfNodes(),globs);
 }
 
-void MEDMeshMultiLev::setNodeReduction(const DataArrayInt *nr)
+void MEDFileField1TSStructItem2::checkWithMeshStructForGaussPT(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
 {
-  if(nr)
-    nr->incrRef();
-  _node_reduction=const_cast<DataArrayInt*>(nr);
+  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);
 }
 
-bool MEDMeshMultiLev::isFastlyTheSameStruct(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+int MEDFileField1TSStructItem2::getNbOfIntegrationPts(const MEDFileFieldGlobsReal *globs) const
 {
-  if(fst.getType()==ON_NODES)
+  if(_loc.empty())
     {
-      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;
+      if(getPflName().empty())
+        return (_start_end.second-_start_end.first)/_nb_of_entity;
+      else
+        return (_start_end.second-_start_end.first)/getPfl(globs)->getNumberOfTuples();
     }
   else
     {
-      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;
+      const MEDFileFieldLoc& loc(globs->getLocalization(_loc.c_str()));
+      return loc.getNumberOfGaussPoints();
     }
 }
 
-DataArray *MEDMeshMultiLev::buildDataArray(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs, const DataArray *vals) const throw(INTERP_KERNEL::Exception)
+std::string MEDFileField1TSStructItem2::getPflName() const
 {
-  MEDCouplingAutoRefCountObjectPtr<DataArray> ret(const_cast<DataArray *>(vals)); ret->incrRef();
-  if(isFastlyTheSameStruct(fst,globs))
-    return ret.retn();
-  else
-    return constructDataArray(fst,globs,vals);
+  return _pfl->getName();
 }
 
-std::string MEDMeshMultiLev::getPflNameOfId(int id) const
+const DataArrayInt *MEDFileField1TSStructItem2::getPfl(const MEDFileFieldGlobsReal *globs) const
 {
-  std::size_t sz(_pfls.size());
-  if(id<0 || id>=sz)
-    throw INTERP_KERNEL::Exception("MEDMeshMultiLev::getPflNameOfId : invalid input id !");
-  const DataArrayInt *pfl(_pfls[id]);
-  if(!pfl)
-    return std::string("");
-  return pfl->getName();
+  if(!_pfl->isAllocated())
+    {
+      if(_pfl->getName().empty())
+        return 0;
+      else
+        return globs->getProfile(_pfl->getName().c_str());
+    }
+  else
+    return _pfl;
 }
 
-DataArray *MEDMeshMultiLev::constructDataArray(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs, const DataArray *vals) 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) throw(INTERP_KERNEL::Exception)
 {
-  if(fst.getType()==ON_NODES)
+  _nb_of_entity=nbOfEntity;
+  if(_pfl->getName().empty())
     {
-      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 : unexpected situation for nodes 3 !");
-          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()!=p.getNbEntity())
-            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 !");
+      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 ;
     }
   else
     {
-      std::size_t sz(fst.getNumberOfItems());
-      std::vector< MEDCouplingAutoRefCountObjectPtr<DataArray> > arrSafe(sz);
-      std::vector< const DataArray *> arr(sz);
-      for(std::size_t i=0;i<sz;i++)
-        {
-          const MEDFileField1TSStructItem2& p(fst[i]);
-          const std::pair<int,int>& strtStop(p.getStartStop());
-          std::vector< INTERP_KERNEL::NormalizedCellType >::const_iterator it(std::find(_geo_types.begin(),_geo_types.end(),p.getGeo()));
-          if(it==_geo_types.end())
-            throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 1 !");
-          if(std::find(it+1,_geo_types.end(),p.getGeo())!=_geo_types.end())
-            throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 2 !");
-          std::size_t pos(std::distance(_geo_types.begin(),it));
-          const DataArrayInt *thisP(_pfls[pos]),*otherP(p.getPfl(globs));
-          MEDCouplingAutoRefCountObjectPtr<DataArray> ret(vals->selectByTupleId2(strtStop.first,strtStop.second,1));
-          if(!thisP && !otherP)
-            {
-              arrSafe[i]=ret; arr[i]=ret;
-              continue;
-            }
-          int nbi(p.getNbOfIntegrationPts(globs)),nc(ret->getNumberOfComponents());
-          if(!thisP && otherP)
-            {
-              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(otherP->deepCpy());
-              p1->sort(true);
-              if(!p1->isIdentity() || p1->getNumberOfTuples()!=p.getNbEntity())
-                throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 3 !");
-              ret->rearrange(nbi*nc); ret->renumberInPlace(otherP->begin()); ret->rearrange(nc);
-              arrSafe[i]=ret; arr[i]=ret;
-              continue;
-            }
-          if(thisP && otherP)
-            {
-              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(otherP->deepCpy());
-              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p2(thisP->deepCpy());
-              p1->sort(true); p2->sort(true);
-              if(!p1->isEqualWithoutConsideringStr(*p2))
-                throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 4 !");
-              p1=DataArrayInt::FindPermutationFromFirstToSecond(otherP,thisP);
-              ret->rearrange(nbi*nc); ret->renumberInPlace(p1->begin()); ret->rearrange(nc);
-              continue;
-            }
-          if(thisP && !otherP)
-            {
-              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(thisP->deepCpy());
-              p1->sort(true);
-              if(!p1->isIdentity() || p1->getNumberOfTuples()!=p.getNbEntity())
-                throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 3 !");
-              ret->rearrange(nbi*nc); ret->renumberInPlaceR(otherP->begin()); ret->rearrange(nc);
-              arrSafe[i]=ret; arr[i]=ret;
-              continue;
-            }
-          throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 6 !");
-        }
-      return DataArray::Aggregate(arr);
+      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);
     }
 }
 
-MEDMeshMultiLev::MEDMeshMultiLev()
+bool MEDFileField1TSStructItem2::isFastlyEqual(int& startExp, INTERP_KERNEL::NormalizedCellType gt, const char *pflName) const
 {
+  if(startExp!=_start_end.first)
+    return false;
+  if(gt!=_geo_type)
+    return false;
+  if(getPflName()!=pflName)
+    return false;
+  startExp=_start_end.second;
+  return true;
 }
 
-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)
+bool MEDFileField1TSStructItem2::operator==(const MEDFileField1TSStructItem2& other) const throw(INTERP_KERNEL::Exception)
 {
-  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]);
-    }
+  //_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();
 }
 
-MEDMeshMultiLev::MEDMeshMultiLev(const MEDMeshMultiLev& other):_pfls(other._pfls),_geo_types(other._geo_types),_nb_entities(other._nb_entities),_node_reduction(other._node_reduction)
+bool MEDFileField1TSStructItem2::isCellSupportEqual(const MEDFileField1TSStructItem2& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
 {
+  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);
 }
 
-//=
-
-MEDUMeshMultiLev *MEDUMeshMultiLev::New(const MEDFileUMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStructItem2::isNodeSupportEqual(const MEDFileField1TSStructItem2& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
 {
-  return new MEDUMeshMultiLev(m,levs);
+  return isCellSupportEqual(other,globs);
 }
 
-MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDFileUMesh *m, const std::vector<int>& levs)
+/*!
+ * \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) throw(INTERP_KERNEL::Exception)
 {
-  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(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++)
     {
-      std::vector<MEDCoupling1GTUMesh *> vTmp(m->getDirectUndergroundSingleGeoTypeMeshes(*it));
-      v.insert(v.end(),vTmp.begin(),vTmp.end());
+      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());
     }
-  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++)
+  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)
     {
-      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();
+      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;
     }
 }
 
-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)
+std::size_t MEDFileField1TSStructItem2::getHeapMemorySize() const
 {
-  return new MEDUMeshMultiLev(m,gts,pfls,nbEntities);
+  std::size_t ret(0);
+  const DataArrayInt *pfl(_pfl);
+  if(pfl)
+    ret+=pfl->getHeapMemorySize();
+  ret+=_loc.capacity();
+  return ret;
 }
 
-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)
+//=
+
+MEDFileField1TSStructItem::MEDFileField1TSStructItem(TypeOfField a, const std::vector< MEDFileField1TSStructItem2 >& b):_computed(false),_type(a),_items(b)
 {
-  std::size_t sz(gts.size());
-  _parts.resize(sz);
-  for(std::size_t i=0;i<sz;i++)
+}
+
+void MEDFileField1TSStructItem::checkWithMeshStruct(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
+{
+  switch(_type)
     {
-      MEDCoupling1GTUMesh *elt(m->getDirectUndergroundSingleGeoTypeMesh(gts[i]));
-      if(elt)
-        elt->incrRef();
-      _parts[i]=elt;
+    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 !");
     }
 }
 
-void MEDUMeshMultiLev::selectPartOfNodes(const DataArrayInt *pflNodes) throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStructItem::operator==(const MEDFileField1TSStructItem& other) 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(_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;
 }
 
-MEDMeshMultiLev *MEDUMeshMultiLev::prepare() const throw(INTERP_KERNEL::Exception)
+bool MEDFileField1TSStructItem::isCellSupportEqual(const MEDFileField1TSStructItem& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
 {
-  return new MEDUMeshMultiLev(*this);
+  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(const MEDUMeshMultiLev& other):MEDMeshMultiLev(other),_parts(other._parts)
+bool MEDFileField1TSStructItem::isNodeSupportEqual(const MEDFileField1TSStructItem& other, const MEDFileFieldGlobsReal *globs) 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].isNodeSupportEqual(other._items[i],globs)))
+      return false;
+  return true;
 }
 
-MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDStructuredMeshMultiLev& other, const MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh>& part):MEDMeshMultiLev(other)
+bool MEDFileField1TSStructItem::isEntityCell() const
 {
-  _parts.resize(1);
-  _parts[0]=part;
+  if(_type==ON_NODES)
+    return false;
+  else
+    return true;
 }
 
-void MEDUMeshMultiLev::buildVTUArrays(DataArrayDouble *& coords, DataArrayByte *&types, DataArrayInt *&cellLocations, DataArrayInt *& cells, DataArrayInt *&faceLocations, DataArrayInt *&faces) const throw(INTERP_KERNEL::Exception)
+class CmpGeo
 {
-  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);
-  for(std::vector< MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> >::const_iterator it=_parts.begin();it!=_parts.end();it++)
+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)
+{
+  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++)
     {
-      const MEDCoupling1GTUMesh *cur(*it);
-      if(!cur)
-        throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : a part is null !");
-      int curNbCells(cur->getNumberOfCells());
-      szBCE+=curNbCells;
-      if((*it)->getCellModelEnum()!=INTERP_KERNEL::NORM_POLYHED)
-        szD=(*it)->getNodalConnectivity()->getNumberOfTuples()+curNbCells;
+      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
-        {
-          isPolyh=true;
-          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp((*it)->computeEffectiveNbOfNodesPerCell());
-          szD+=tmp->accumulate(0)+curNbCells;
-          szF+=2*curNbCells+(*it)->getNodalConnectivity()->getNumberOfTuples();
-        }
+        (*it0).second.push_back(i);
     }
-  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);
-  for(std::vector< MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> >::const_iterator it=_parts.begin();it!=_parts.end();it++)
+  if(m.size()==_items.size())
     {
-      const MEDCoupling1GTUMesh *cur(*it);
-      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==-1)
-        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+nnpc; k=*cPtr++;
-            }
-          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+connIPtr[1]-connIPtr[0]; k=*cPtr++;
-                }
-            }
-          else
-            {
-              for(int i=0;i<curNbCells;i++,connIPtr++)
-                {
-                  std::set<int> s(connPtr+connIPtr[0],connPtr+connIPtr[1]);
-                  *dPtr++=(int)s.size();
-                  dPtr=std::copy(s.begin(),s.end(),dPtr);
-                  *cPtr=k+(int)s.size(); k=*cPtr++;
-                }
-            }
-          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;
-                    }
-                }
-            }
+      MEDFileField1TSStructItem ret(*this);
+      ret._type=ON_CELLS;
+      return ret;
+    }
+  std::size_t sz(m.size());
+  std::vector< MEDFileField1TSStructItem2 > items(sz);
+  for(i=0;i<sz;i++)
+    {
+      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;
+}
+
+/*!
+ * \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)
+{
+  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);
+    }
+}
+
+bool MEDFileField1TSStructItem::isFullyOnOneLev(const MEDFileMeshStruct *meshSt, int& theFirstLevFull) const throw(INTERP_KERNEL::Exception)
+{
+  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++)
+    {
+      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]++;
     }
-  if(!isPolyh)
-    reorderNodesIfNecessary(a,d,0);
-  else
-    reorderNodesIfNecessary(a,d,f);
-  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(); }
+  for(int i=0;i<nbOfLevs;i++)
+    if(meshSt->getNumberOfGeoTypesInLev(-i)==levs[i])
+      { theFirstLevFull=-i; return true; }
+  return false;
 }
 
-void MEDUMeshMultiLev::reorderNodesIfNecessary(DataArrayDouble *coords, DataArrayInt *nodalConnVTK, DataArrayInt *polyhedNodalConnVTK) const throw(INTERP_KERNEL::Exception)
+const MEDFileField1TSStructItem2& MEDFileField1TSStructItem::operator[](std::size_t i) const throw(INTERP_KERNEL::Exception)
 {
-  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)
+  if(i<0 || i>=_items.size())
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStructItem::operator[] : input is not in valid range !");
+  return _items[i];
+}
+
+std::size_t MEDFileField1TSStructItem::getHeapMemorySize() const
+{
+  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)
+{
+  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++)
     {
-      int nb(*work++);
-      for(int i=0;i<nb && work!=endW;i++,work++)
-        {
-          if(*work>=0 && *work<sz)
-            b[sz]=true;
-          else
-            throw INTERP_KERNEL::Exception("MEDStructuredMeshMultiLev::reorderNodesIfNecessary : internal error !");
-        }
+      a0[i]=(*it).getGeo();
+      a1[i]=(*it).getPfl(globs);
+      a2[i]=mst->getNumberOfElemsOfGeoType((*it).getGeo());
     }
-  if(polyhedNodalConnVTK)
+  return MEDMeshMultiLev::New(mst->getTheMesh(),a0,a1,a2);
+}
+
+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(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++)
     {
-      work=polyhedNodalConnVTK->begin(); endW=polyhedNodalConnVTK->end();
-      while(work!=endW)
+      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++)
         {
-          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[sz]=true;
-                  else
-                    throw INTERP_KERNEL::Exception("MEDStructuredMeshMultiLev::reorderNodesIfNecessary : internal error #2 !");
-                }
-            }
+          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 !");
         }
     }
-  int szExp(std::count(b.begin(),b.end(),true));
-  if(szExp!=nr->getNumberOfTuples())
-    throw INTERP_KERNEL::Exception("MEDStructuredMeshMultiLev::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;
-  //tony you have to finish
-  /*MEDCouplingAutoRefCountObjectPtr<DataArrayInt> n2o(o2n->invertO2N2N2O(nr->getNumberOfTuples()));
-  
-  const int *o2nc(o2n->begin());
-  int *work2(nodalConnVTK->getPointer()),*endW2(nodalConnVTK->getPointer());
-  MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> coo(coords->selectByTupleIdSafe(nr->begin(),nr->end()));*/
+  MEDFileField1TSStructItem ret(atype,anItems);
+  ret.checkWithMeshStruct(meshSt,ref);
+  return ret;
 }
 
 //=
 
-MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev()
+MEDFileField1TSStruct *MEDFileField1TSStruct::New(const MEDFileAnyTypeField1TS *ref, MEDFileMeshStruct *mst) throw(INTERP_KERNEL::Exception)
 {
+  return new MEDFileField1TSStruct(ref,mst);
 }
 
-MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDMeshMultiLev(gts,pfls,nbEntities)
+MEDFileField1TSStruct::MEDFileField1TSStruct(const MEDFileAnyTypeField1TS *ref, MEDFileMeshStruct *mst)
 {
+  _already_checked.push_back(MEDFileField1TSStructItem::BuildItemFrom(ref,mst));
 }
 
-void MEDStructuredMeshMultiLev::selectPartOfNodes(const DataArrayInt *pflNodes) throw(INTERP_KERNEL::Exception)
+void MEDFileField1TSStruct::checkWithMeshStruct(MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception)
 {
-  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;
+  if(_already_checked.empty())
+    throw INTERP_KERNEL::Exception("MEDFileField1TSStruct::checkWithMeshStruct : not correctly initialized !");
+  _already_checked.back().checkWithMeshStruct(mst,globs);
 }
 
-MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const MEDStructuredMeshMultiLev& other):MEDMeshMultiLev(other)
+bool MEDFileField1TSStruct::isEqualConsideringThePast(const MEDFileAnyTypeField1TS *other, const MEDFileMeshStruct *mst) const throw(INTERP_KERNEL::Exception)
 {
+  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::New(const MEDFileCMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
+/*!
+ * 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)
 {
-  return new MEDCMeshMultiLev(m,levs);
+  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)
+    {
+      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::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::isCompatibleWithNodesDiscr(const MEDFileAnyTypeField1TS *other, const MEDFileMeshStruct *meshSt) throw(INTERP_KERNEL::Exception)
 {
-  return new MEDCMeshMultiLev(m,gts,pfls,nbEntities);
+  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(MEDFileField1TSStructItem::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)
+    {
+      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;
 }
 
-MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDFileCMesh *m, const std::vector<int>& levs)
+std::size_t MEDFileField1TSStruct::getHeapMemorySize() const
 {
-  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++)
-    {
-      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;
-    }
+  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;
 }
 
-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)
+MEDMeshMultiLev *MEDFileField1TSStruct::buildFromScratchDataSetSupport(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
 {
-  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::buildFromScratchDataSetSupport : No outline structure in this !");
+  int pos0(-1),pos1(-1);
+  if(presenceOfCellDiscr(pos0))
     {
-      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;
+      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));
     }
 }
 
-MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDCMeshMultiLev& other):MEDStructuredMeshMultiLev(other)
+bool MEDFileField1TSStruct::isDataSetSupportFastlyEqualTo(const MEDFileField1TSStruct& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
 {
+  int b0,b1;
+  bool a0(presenceOfCellDiscr(b0)),a1(presenceOfPartialNodeDiscr(b1));
+  int d0,d1;
+  bool c0(other.presenceOfCellDiscr(d0)),c1(other.presenceOfPartialNodeDiscr(d1)); 
+  if(a0!=c0 || a1!=c1)
+    return false;
+  if(a0)
+    if(!_already_checked[b0].isCellSupportEqual(other._already_checked[d0],globs))
+      return false;
+  if(a1)
+    if(!_already_checked[b1].isNodeSupportEqual(other._already_checked[d1],globs))
+      return false;
+  return true;
 }
 
-std::vector<int> MEDCMeshMultiLev::getNodeGridStructure() const throw(INTERP_KERNEL::Exception)
+/*!
+ * 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)
 {
-  std::vector<int> ret(_coords.size());
-  for(std::size_t i=0;i<_coords.size();i++)
-    ret[i]=_coords[i]->getNumberOfTuples();
+  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;
 }
 
-MEDMeshMultiLev *MEDCMeshMultiLev::prepare() const throw(INTERP_KERNEL::Exception)
+/*!
+ * 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)
 {
-  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)
+  int i(0);
+  for(std::vector<MEDFileField1TSStructItem>::const_iterator it=_already_checked.begin();it!=_already_checked.end();it++,i++)
     {
-      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();
-        }
-      else
+      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();
+          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 !");
         }
     }
-  else
-    {
-      MEDCouplingAutoRefCountObjectPtr<MEDCMeshMultiLev> ret(new MEDCMeshMultiLev(*this));
-      if(nr)
-        { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
-      return ret.retn();
-    }
+  return false;
 }
 
 //=
 
-MEDCurveLinearMeshMultiLev *MEDCurveLinearMeshMultiLev::New(const MEDFileCurveLinearMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
-{
-  return new MEDCurveLinearMeshMultiLev(m,levs);
-}
-
-MEDCurveLinearMeshMultiLev *MEDCurveLinearMeshMultiLev::New(const MEDFileCurveLinearMesh *m, const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities) throw(INTERP_KERNEL::Exception)
+MEDFileFastCellSupportComparator *MEDFileFastCellSupportComparator::New(const MEDFileMeshStruct *m, const MEDFileAnyTypeFieldMultiTS *ref) throw(INTERP_KERNEL::Exception)
 {
-  return new MEDCurveLinearMeshMultiLev(m,gts,pfls,nbEntities);
+  return new MEDFileFastCellSupportComparator(m,ref);
 }
 
-MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDFileCurveLinearMesh *m, const std::vector<int>& levs)
+MEDFileFastCellSupportComparator::MEDFileFastCellSupportComparator(const MEDFileMeshStruct *m, const MEDFileAnyTypeFieldMultiTS *ref)
 {
   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();
+    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<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDStructuredMeshMultiLev(gts,pfls,nbEntities)
+std::size_t MEDFileFastCellSupportComparator::getHeapMemorySize() 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::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;
 }
 
-MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDCurveLinearMeshMultiLev& other):MEDStructuredMeshMultiLev(other),_coords(other._coords),_structure(other._structure)
+bool MEDFileFastCellSupportComparator::isEqual(const MEDFileAnyTypeFieldMultiTS *other) throw(INTERP_KERNEL::Exception)
 {
+  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) throw(INTERP_KERNEL::Exception)
 {
-  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 throw(INTERP_KERNEL::Exception)
 {
-  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 throw(INTERP_KERNEL::Exception)
+{
+  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);
 }
diff --git a/src/MEDLoader/MEDFileFieldOverView.hxx b/src/MEDLoader/MEDFileFieldOverView.hxx
index 441d45322..1eeedd0c3 100644
--- a/src/MEDLoader/MEDFileFieldOverView.hxx
+++ b/src/MEDLoader/MEDFileFieldOverView.hxx
@@ -134,6 +134,7 @@ namespace ParaMEDMEM
     static 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);
     std::vector<int> getNodeGridStructure() const throw(INTERP_KERNEL::Exception);
     MEDMeshMultiLev *prepare() const throw(INTERP_KERNEL::Exception);
+    std::vector< DataArrayDouble * > buildVTUArrays() const throw(INTERP_KERNEL::Exception);
   private:
     MEDCMeshMultiLev(const MEDCMeshMultiLev& other);
     MEDCMeshMultiLev(const MEDFileCMesh *m, const std::vector<int>& levs);
@@ -149,6 +150,7 @@ namespace ParaMEDMEM
     static 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);
     std::vector<int> getNodeGridStructure() const throw(INTERP_KERNEL::Exception);
     MEDMeshMultiLev *prepare() const throw(INTERP_KERNEL::Exception);
+    void buildVTUArrays(DataArrayDouble *&coords, std::vector<int>& nodeStrct) const throw(INTERP_KERNEL::Exception);
   private:
     MEDCurveLinearMeshMultiLev(const MEDCurveLinearMeshMultiLev& other);
     MEDCurveLinearMeshMultiLev(const MEDFileCurveLinearMesh *m, const std::vector<int>& levs);
@@ -195,6 +197,7 @@ namespace ParaMEDMEM
   class MEDFileField1TSStructItem : public RefCountObject
   {
   public:
+    MEDFileField1TSStructItem() { }
     MEDFileField1TSStructItem(TypeOfField a, const std::vector< MEDFileField1TSStructItem2 >& b);
     void checkWithMeshStruct(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) throw(INTERP_KERNEL::Exception);
     bool operator==(const MEDFileField1TSStructItem& other) const throw(INTERP_KERNEL::Exception);
@@ -211,6 +214,7 @@ namespace ParaMEDMEM
     bool isCompatibleWithNodesDiscr(const MEDFileField1TSStructItem& other, const MEDFileMeshStruct *meshSt, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception);
     bool isFullyOnOneLev(const MEDFileMeshStruct *meshSt, int& theFirstLevFull) const throw(INTERP_KERNEL::Exception);
     MEDMeshMultiLev *buildFromScratchDataSetSupportOnCells(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception);
+    static MEDFileField1TSStructItem BuildItemFrom(const MEDFileAnyTypeField1TS *ref, const MEDFileMeshStruct *meshSt);
   private:
     bool _computed;
     TypeOfField _type;
@@ -228,7 +232,6 @@ namespace ParaMEDMEM
     bool isCompatibleWithNodesDiscr(const MEDFileAnyTypeField1TS *other, const MEDFileMeshStruct *meshSt) throw(INTERP_KERNEL::Exception);
     MEDMeshMultiLev *buildFromScratchDataSetSupport(const MEDFileMeshStruct *mst, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception);
     bool isDataSetSupportFastlyEqualTo(const MEDFileField1TSStruct& other, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception);
-    static MEDFileField1TSStructItem BuildItemFrom(const MEDFileAnyTypeField1TS *ref, const MEDFileMeshStruct *meshSt);
   private:
     MEDFileField1TSStruct(const MEDFileAnyTypeField1TS *ref, MEDFileMeshStruct *mst);
     bool presenceOfCellDiscr(int& pos) const throw(INTERP_KERNEL::Exception);
diff --git a/src/MEDLoader/Swig/MEDLoaderCommon.i b/src/MEDLoader/Swig/MEDLoaderCommon.i
index c0b36d9bc..864f1307f 100644
--- a/src/MEDLoader/Swig/MEDLoaderCommon.i
+++ b/src/MEDLoader/Swig/MEDLoaderCommon.i
@@ -32,6 +32,7 @@
 #include "MEDFileParameter.hxx"
 #include "MEDFileData.hxx"
 #include "MEDFileMeshReadSelector.hxx"
+#include "MEDFileFieldOverView.hxx"
 #include "MEDLoaderTypemaps.i"
 #include "SauvReader.hxx"
 #include "SauvWriter.hxx"
@@ -63,6 +64,11 @@ using namespace ParaMEDMEM;
   $result=convertMEDFileField1TS($1,$owner);
 }
 
+%typemap(out) ParaMEDMEM::MEDMeshMultiLev*
+{
+  $result=convertMEDMeshMultiLev($1,$owner);
+}
+
 %newobject MEDLoader::ReadUMeshFromFamilies;
 %newobject MEDLoader::ReadUMeshFromGroups;
 %newobject MEDLoader::ReadUMeshFromFile;
@@ -175,6 +181,11 @@ using namespace ParaMEDMEM;
 %newobject ParaMEDMEM::SauvReader::New;
 %newobject ParaMEDMEM::SauvReader::loadInMEDFileDS;
 
+%newobject ParaMEDMEM::MEDFileMeshStruct::New;
+%newobject ParaMEDMEM::MEDMeshMultiLev::buildDataArray;
+%newobject ParaMEDMEM::MEDFileFastCellSupportComparator::New;
+%newobject ParaMEDMEM::MEDFileFastCellSupportComparator::buildFromScratchDataSetSupport;
+
 %feature("unref") MEDFileMesh "$this->decrRef();"
 %feature("unref") MEDFileUMesh "$this->decrRef();"
 %feature("unref") MEDFileCMesh "$this->decrRef();"
@@ -196,6 +207,11 @@ using namespace ParaMEDMEM;
 %feature("unref") MEDFileData "$this->decrRef();"
 %feature("unref") SauvReader "$this->decrRef();"
 %feature("unref") SauvWriter "$this->decrRef();"
+%feature("unref") MEDFileFastCellSupportComparator "$this->decrRef();"
+%feature("unref") MEDMeshMultiLev "$this->decrRef();"
+%feature("unref") MEDUMeshMultiLev "$this->decrRef();"
+%feature("unref") MEDCMeshMultiLev "$this->decrRef();"
+%feature("unref") MEDCurveLinearMeshMultiLev "$this->decrRef();"
 
 class MEDLoader
 {
@@ -2756,5 +2772,112 @@ namespace ParaMEDMEM
     void setMEDFileDS(const MEDFileData* medData, unsigned meshIndex = 0) throw(INTERP_KERNEL::Exception);
     void write(const char* fileName) throw(INTERP_KERNEL::Exception);
   };
+  
+  ///////////////
+
+  class MEDFileMeshStruct;
+
+  class MEDFileField1TSStructItem
+  {
+  public:
+    static MEDFileField1TSStructItem BuildItemFrom(const MEDFileAnyTypeField1TS *ref, const MEDFileMeshStruct *meshSt);
+  };
+
+  class MEDFileMeshStruct : public RefCountObject
+  {
+  public:
+    static MEDFileMeshStruct *New(const MEDFileMesh *mesh);
+  private:
+    ~MEDFileMeshStruct();
+  };
+  
+  class MEDMeshMultiLev : public RefCountObject
+  {
+  public:
+    DataArray *buildDataArray(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs, const DataArray *vals) const throw(INTERP_KERNEL::Exception);
+  private:
+    ~MEDMeshMultiLev();
+  };
+
+  class MEDUMeshMultiLev : public MEDMeshMultiLev
+  {
+  private:
+    ~MEDUMeshMultiLev();
+  public:
+    %extend
+     {
+       PyObject *buildVTUArrays() const throw(INTERP_KERNEL::Exception)
+       {
+         DataArrayDouble *coords(0); DataArrayByte *types(0); DataArrayInt *cellLocations(0),*cells(0),*faceLocations(0),*faces(0);
+         self->buildVTUArrays(coords,types,cellLocations,cells,faceLocations,faces);
+         PyObject *ret=PyTuple_New(6);
+         PyTuple_SetItem(ret,0,SWIG_NewPointerObj(SWIG_as_voidptr(coords),SWIGTYPE_p_ParaMEDMEM__DataArrayDouble, SWIG_POINTER_OWN | 0 ));
+         PyTuple_SetItem(ret,1,SWIG_NewPointerObj(SWIG_as_voidptr(types),SWIGTYPE_p_ParaMEDMEM__DataArrayByte, SWIG_POINTER_OWN | 0 ));
+         PyTuple_SetItem(ret,2,SWIG_NewPointerObj(SWIG_as_voidptr(cellLocations),SWIGTYPE_p_ParaMEDMEM__DataArrayInt, SWIG_POINTER_OWN | 0 ));
+         PyTuple_SetItem(ret,3,SWIG_NewPointerObj(SWIG_as_voidptr(cells),SWIGTYPE_p_ParaMEDMEM__DataArrayInt, SWIG_POINTER_OWN | 0 ));
+         PyTuple_SetItem(ret,4,SWIG_NewPointerObj(SWIG_as_voidptr(faceLocations),SWIGTYPE_p_ParaMEDMEM__DataArrayInt, SWIG_POINTER_OWN | 0 ));
+         PyTuple_SetItem(ret,5,SWIG_NewPointerObj(SWIG_as_voidptr(faces),SWIGTYPE_p_ParaMEDMEM__DataArrayInt, SWIG_POINTER_OWN | 0 ));
+         return ret;
+       }
+     }
+  };
+
+  class MEDStructuredMeshMultiLev : public MEDMeshMultiLev
+  {
+  private:
+    ~MEDStructuredMeshMultiLev();
+  };
+
+  class MEDCMeshMultiLev : public MEDStructuredMeshMultiLev
+  {
+  private:
+    ~MEDCMeshMultiLev();
+  public:
+    %extend
+    {
+      PyObject *buildVTUArrays() const throw(INTERP_KERNEL::Exception)
+      {
+        std::vector< DataArrayDouble * > objs(self->buildVTUArrays());
+        std::size_t sz(objs.size());
+        PyObject *ret=PyList_New(sz);
+        for(std::size_t i=0;i<sz;i++)
+          PyList_SetItem(ret,i,SWIG_NewPointerObj(SWIG_as_voidptr(objs[i]),SWIGTYPE_p_ParaMEDMEM__DataArrayDouble, SWIG_POINTER_OWN | 0 ));
+        return ret;
+      }
+    }
+  };
+
+  class MEDCurveLinearMeshMultiLev : public MEDStructuredMeshMultiLev
+  {
+  private:
+    ~MEDCurveLinearMeshMultiLev();
+  public:
+    %extend
+    {
+      PyObject *buildVTUArrays(DataArrayDouble *&coords, std::vector<int>& nodeStrct) const throw(INTERP_KERNEL::Exception)
+      {
+        DataArrayDouble *ret0(0);
+        std::vector<int> ret1;
+        self->buildVTUArrays(ret0,ret1);
+        std::size_t sz(ret1.size());
+        PyObject *ret=PyTuple_New(2);
+        PyTuple_SetItem(ret,0,SWIG_NewPointerObj(SWIG_as_voidptr(ret0),SWIGTYPE_p_ParaMEDMEM__DataArrayDouble, SWIG_POINTER_OWN | 0 ));
+        PyObject *ret1Py=PyList_New(sz);
+        for(std::size_t i=0;i<sz;i++)
+          PyList_SetItem(ret1Py,i,SWIG_From_int(ret1[i]));
+        PyTuple_SetItem(ret,1,ret1Py);
+        return ret;
+      }
+    }
+  };
 
+  class MEDFileFastCellSupportComparator : public RefCountObject
+  {
+  public:
+    static MEDFileFastCellSupportComparator *New(const MEDFileMeshStruct *m, const MEDFileAnyTypeFieldMultiTS *ref) throw(INTERP_KERNEL::Exception);
+    MEDMeshMultiLev *buildFromScratchDataSetSupport(int timeStepId, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception);
+    bool isDataSetSupportEqualToThePreviousOne(int timeStepId, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception);
+  private:
+    ~MEDFileFastCellSupportComparator();
+  };
 }
diff --git a/src/MEDLoader/Swig/MEDLoaderTypemaps.i b/src/MEDLoader/Swig/MEDLoaderTypemaps.i
index ad068af70..eaf4e491b 100644
--- a/src/MEDLoader/Swig/MEDLoaderTypemaps.i
+++ b/src/MEDLoader/Swig/MEDLoaderTypemaps.i
@@ -20,7 +20,7 @@
 
 #include <vector>
 
-static PyObject* convertMEDFileMesh(ParaMEDMEM::MEDFileMesh* mesh, int owner) throw(INTERP_KERNEL::Exception)
+static PyObject *convertMEDFileMesh(ParaMEDMEM::MEDFileMesh* mesh, int owner) throw(INTERP_KERNEL::Exception)
 {
   PyObject *ret=0;
   if(!mesh)
@@ -39,7 +39,7 @@ static PyObject* convertMEDFileMesh(ParaMEDMEM::MEDFileMesh* mesh, int owner) th
   return ret;
 }
 
-static PyObject* convertMEDFileParameter1TS(ParaMEDMEM::MEDFileParameter1TS* p1ts, int owner) throw(INTERP_KERNEL::Exception)
+static PyObject *convertMEDFileParameter1TS(ParaMEDMEM::MEDFileParameter1TS* p1ts, int owner) throw(INTERP_KERNEL::Exception)
 {
   PyObject *ret=0;
   if(!p1ts)
@@ -56,7 +56,7 @@ static PyObject* convertMEDFileParameter1TS(ParaMEDMEM::MEDFileParameter1TS* p1t
   return ret;
 }
 
-static PyObject* convertMEDFileField1TS(ParaMEDMEM::MEDFileAnyTypeField1TS *p, int owner) throw(INTERP_KERNEL::Exception)
+static PyObject *convertMEDFileField1TS(ParaMEDMEM::MEDFileAnyTypeField1TS *p, int owner) throw(INTERP_KERNEL::Exception)
 {
   PyObject *ret=0;
   if(!p)
@@ -73,7 +73,7 @@ static PyObject* convertMEDFileField1TS(ParaMEDMEM::MEDFileAnyTypeField1TS *p, i
   return ret;
 }
 
-static PyObject* convertMEDFileFieldMultiTS(ParaMEDMEM::MEDFileAnyTypeFieldMultiTS *p, int owner) throw(INTERP_KERNEL::Exception)
+static PyObject *convertMEDFileFieldMultiTS(ParaMEDMEM::MEDFileAnyTypeFieldMultiTS *p, int owner) throw(INTERP_KERNEL::Exception)
 {
   PyObject *ret=0;
   if(!p)
@@ -90,6 +90,25 @@ static PyObject* convertMEDFileFieldMultiTS(ParaMEDMEM::MEDFileAnyTypeFieldMulti
   return ret;
 }
 
+static PyObject *convertMEDMeshMultiLev(ParaMEDMEM::MEDMeshMultiLev *p, int owner) throw(INTERP_KERNEL::Exception)
+{
+  PyObject *ret=0;
+  if(!p)
+    {
+      Py_XINCREF(Py_None);
+      return Py_None;
+    }
+  if(dynamic_cast<MEDUMeshMultiLev *>(p))
+    ret=SWIG_NewPointerObj((void*)p,SWIGTYPE_p_ParaMEDMEM__MEDUMeshMultiLev,owner);
+  if(dynamic_cast<MEDCMeshMultiLev *>(p))
+    ret=SWIG_NewPointerObj((void*)p,SWIGTYPE_p_ParaMEDMEM__MEDCMeshMultiLev,owner);
+  if(dynamic_cast<MEDStructuredMeshMultiLev *>(p))
+    ret=SWIG_NewPointerObj((void*)p,SWIGTYPE_p_ParaMEDMEM__MEDStructuredMeshMultiLev,owner);
+  if(!ret)
+    throw INTERP_KERNEL::Exception("Not recognized type of MEDMeshMultiLev on downcast !");
+  return ret;
+}
+
 static std::vector<std::pair<int,int> > convertTimePairIdsFromPy(PyObject *pyLi) throw(INTERP_KERNEL::Exception)
 {
   std::vector<std::pair<int,int> > ret;