X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=src%2FMEDCoupling%2FMEDCouplingStructuredMesh.cxx;h=3570a3b00938d69e47d1d16ac9c203ebf1f5736f;hb=fe438311fdcdfa797c8e6a95357164a89cc7abc0;hp=71b581d3c07711d9e84709562f459d6e3dbe9f06;hpb=9b477477cc54b36d544f215af2060ed817a876dd;p=tools%2Fmedcoupling.git

diff --git a/src/MEDCoupling/MEDCouplingStructuredMesh.cxx b/src/MEDCoupling/MEDCouplingStructuredMesh.cxx
old mode 100644
new mode 100755
index 71b581d3c..3570a3b00
--- a/src/MEDCoupling/MEDCouplingStructuredMesh.cxx
+++ b/src/MEDCoupling/MEDCouplingStructuredMesh.cxx
@@ -1,9 +1,9 @@
-// Copyright (C) 2007-2013  CEA/DEN, EDF R&D
+// Copyright (C) 2007-2020  CEA/DEN, EDF R&D
 //
 // This library is free software; you can redistribute it and/or
 // modify it under the terms of the GNU Lesser General Public
 // License as published by the Free Software Foundation; either
-// version 2.1 of the License.
+// version 2.1 of the License, or (at your option) any later version.
 //
 // This library is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -23,16 +23,17 @@
 #include "MEDCouplingMemArray.hxx"
 #include "MEDCoupling1GTUMesh.hxx"
 #include "MEDCouplingUMesh.hxx"
+#include "MEDCouplingIMesh.hxx"//tony to throw when optimization will be performed in AssignPartOfFieldOfDoubleUsing
 
 #include <numeric>
 
-using namespace ParaMEDMEM;
+using namespace MEDCoupling;
 
 MEDCouplingStructuredMesh::MEDCouplingStructuredMesh()
 {
 }
 
-MEDCouplingStructuredMesh::MEDCouplingStructuredMesh(const MEDCouplingStructuredMesh& other, bool deepCopy):MEDCouplingMesh(other)
+MEDCouplingStructuredMesh::MEDCouplingStructuredMesh(const MEDCouplingStructuredMesh& other, bool deepCpy):MEDCouplingMesh(other)
 {
 }
 
@@ -55,7 +56,7 @@ bool MEDCouplingStructuredMesh::isEqualIfNotWhy(const MEDCouplingMesh *other, do
   return MEDCouplingMesh::isEqualIfNotWhy(other,prec,reason);
 }
 
-INTERP_KERNEL::NormalizedCellType MEDCouplingStructuredMesh::getTypeOfCell(int cellId) const
+INTERP_KERNEL::NormalizedCellType MEDCouplingStructuredMesh::getTypeOfCell(mcIdType cellId) const
 {
   return GetGeoTypeGivenMeshDimension(getMeshDimension());
 }
@@ -63,7 +64,7 @@ INTERP_KERNEL::NormalizedCellType MEDCouplingStructuredMesh::getTypeOfCell(int c
 INTERP_KERNEL::NormalizedCellType MEDCouplingStructuredMesh::GetGeoTypeGivenMeshDimension(int meshDim)
 {
   switch(meshDim)
-    {
+  {
     case 3:
       return INTERP_KERNEL::NORM_HEXA8;
     case 2:
@@ -74,7 +75,7 @@ INTERP_KERNEL::NormalizedCellType MEDCouplingStructuredMesh::GetGeoTypeGivenMesh
       return INTERP_KERNEL::NORM_POINT1;
     default:
       throw INTERP_KERNEL::Exception("Unexpected dimension for MEDCouplingStructuredMesh::GetGeoTypeGivenMeshDimension !");
-    }
+  }
 }
 
 std::set<INTERP_KERNEL::NormalizedCellType> MEDCouplingStructuredMesh::getAllGeoTypes() const
@@ -84,19 +85,19 @@ std::set<INTERP_KERNEL::NormalizedCellType> MEDCouplingStructuredMesh::getAllGeo
   return ret2;
 }
 
-int MEDCouplingStructuredMesh::getNumberOfCellsWithType(INTERP_KERNEL::NormalizedCellType type) const
+mcIdType MEDCouplingStructuredMesh::getNumberOfCellsWithType(INTERP_KERNEL::NormalizedCellType type) const
 {
-  int ret=getNumberOfCells();
+  mcIdType ret(getNumberOfCells());
   if(type==getTypeOfCell(0))
     return ret;
-  const INTERP_KERNEL::CellModel& cm=INTERP_KERNEL::CellModel::GetCellModel(getTypeOfCell(0));
+  const INTERP_KERNEL::CellModel& cm(INTERP_KERNEL::CellModel::GetCellModel(getTypeOfCell(0)));
   std::ostringstream oss; oss << "MEDCouplingStructuredMesh::getNumberOfCellsWithType : no specified type ! Type available is " << cm.getRepr() << " !";
   throw INTERP_KERNEL::Exception(oss.str().c_str());
 }
 
-DataArrayInt *MEDCouplingStructuredMesh::giveCellsWithType(INTERP_KERNEL::NormalizedCellType type) const
+DataArrayIdType *MEDCouplingStructuredMesh::giveCellsWithType(INTERP_KERNEL::NormalizedCellType type) const
 {
-  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> ret=DataArrayInt::New();
+  MCAuto<DataArrayIdType> ret=DataArrayIdType::New();
   if(getTypeOfCell(0)==type)
     {
       ret->alloc(getNumberOfCells(),1);
@@ -107,23 +108,23 @@ DataArrayInt *MEDCouplingStructuredMesh::giveCellsWithType(INTERP_KERNEL::Normal
   return ret.retn();
 }
 
-DataArrayInt *MEDCouplingStructuredMesh::computeNbOfNodesPerCell() const
+DataArrayIdType *MEDCouplingStructuredMesh::computeNbOfNodesPerCell() const
 {
-  int nbCells=getNumberOfCells();
-  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> ret=DataArrayInt::New();
+  std::size_t nbCells=getNumberOfCells();
+  MCAuto<DataArrayIdType> ret=DataArrayIdType::New();
   ret->alloc(nbCells,1);
   const INTERP_KERNEL::CellModel& cm=INTERP_KERNEL::CellModel::GetCellModel(getTypeOfCell(0));
-  ret->fillWithValue((int)cm.getNumberOfNodes());
+  ret->fillWithValue(ToIdType(cm.getNumberOfNodes()));
   return ret.retn();
 }
 
-DataArrayInt *MEDCouplingStructuredMesh::computeNbOfFacesPerCell() const
+DataArrayIdType *MEDCouplingStructuredMesh::computeNbOfFacesPerCell() const
 {
-  int nbCells=getNumberOfCells();
-  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> ret=DataArrayInt::New();
+  std::size_t nbCells=getNumberOfCells();
+  MCAuto<DataArrayIdType> ret=DataArrayIdType::New();
   ret->alloc(nbCells,1);
   const INTERP_KERNEL::CellModel& cm=INTERP_KERNEL::CellModel::GetCellModel(getTypeOfCell(0));
-  ret->fillWithValue((int)cm.getNumberOfSons());
+  ret->fillWithValue(ToIdType(cm.getNumberOfSons()));
   return ret.retn();
 }
 
@@ -132,23 +133,23 @@ DataArrayInt *MEDCouplingStructuredMesh::computeNbOfFacesPerCell() const
  * will be counted only once here whereas it will be counted several times in MEDCouplingMesh::computeNbOfNodesPerCell method.
  * Here for structured mesh it returns exactly as MEDCouplingStructuredMesh::computeNbOfNodesPerCell does.
  *
- * \return DataArrayInt * - new object to be deallocated by the caller.
+ * \return DataArrayIdType * - new object to be deallocated by the caller.
  */
-DataArrayInt *MEDCouplingStructuredMesh::computeEffectiveNbOfNodesPerCell() const
+DataArrayIdType *MEDCouplingStructuredMesh::computeEffectiveNbOfNodesPerCell() const
 {
   return computeNbOfNodesPerCell();
 }
 
-void MEDCouplingStructuredMesh::getNodeIdsOfCell(int cellId, std::vector<int>& conn) const
+void MEDCouplingStructuredMesh::getNodeIdsOfCell(mcIdType cellId, std::vector<mcIdType>& conn) const
 {
   int meshDim=getMeshDimension();
-  int tmpCell[3],tmpNode[3];
+  mcIdType tmpCell[3],tmpNode[3];
   getSplitCellValues(tmpCell);
   getSplitNodeValues(tmpNode);
-  int tmp2[3];
+  mcIdType tmp2[3];
   GetPosFromId(cellId,meshDim,tmpCell,tmp2);
   switch(meshDim)
-    {
+  {
     case 1:
       conn.push_back(tmp2[0]); conn.push_back(tmp2[0]+1);
       break;
@@ -164,16 +165,81 @@ void MEDCouplingStructuredMesh::getNodeIdsOfCell(int cellId, std::vector<int>& c
       break;
     default:
       throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::getNodeIdsOfCell : big problem spacedim must be in 1,2 or 3 !");
-    };
+  };
+}
+
+/*!
+ * This method returns the mesh dimension of \a this. It can be different from space dimension in case of a not null dimension contains only one node.
+ */
+int MEDCouplingStructuredMesh::getMeshDimension() const
+{
+  std::vector<mcIdType> ngs(getNodeGridStructure());
+  int ret(0),pos(0);
+  for(std::vector<mcIdType>::const_iterator it=ngs.begin();it!=ngs.end();it++,pos++)
+    {
+      if(*it<=0)
+        {
+          std::ostringstream oss; oss << "MEDCouplingStructuredMesh::getMeshDimension : At pos #" << pos << " number of nodes is " << *it << " ! Must be > 0 !";
+          throw INTERP_KERNEL::Exception(oss.str().c_str());
+        }
+      if(*it>1)
+        ret++;
+    }
+  return ret;
+}
+
+/*!
+ * This method returns the space dimension by only considering the node grid structure.
+ * For cartesian mesh the returned value is equal to those returned by getSpaceDimension.
+ * But for curvelinear is could be different !
+ */
+int MEDCouplingStructuredMesh::getSpaceDimensionOnNodeStruct() const
+{
+  std::vector<mcIdType> nodeStr(getNodeGridStructure());
+  int spd1(0),pos(0);
+  for(std::vector<mcIdType>::const_iterator it=nodeStr.begin();it!=nodeStr.end();it++,pos++)
+    {
+      mcIdType elt(*it);
+      if(elt<=0)
+        {
+          std::ostringstream oss; oss << "MEDCouplingStructuredMesh::getSpaceDimensionOnNodeStruct : At pos #" << pos << " value of node grid structure is " << *it << " ! must be >=1 !";
+          throw INTERP_KERNEL::Exception(oss.str().c_str());
+        }
+      spd1++;
+    }
+  return spd1;
+}
+
+void MEDCouplingStructuredMesh::getSplitCellValues(mcIdType *res) const
+{
+  std::vector<mcIdType> strct(getCellGridStructure());
+  std::vector<mcIdType> ret(MEDCouplingStructuredMesh::GetSplitVectFromStruct(strct));
+  std::copy(ret.begin(),ret.end(),res);
+}
+
+void MEDCouplingStructuredMesh::getSplitNodeValues(mcIdType *res) const
+{
+  std::vector<mcIdType> strct(getNodeGridStructure());
+  std::vector<mcIdType> ret(MEDCouplingStructuredMesh::GetSplitVectFromStruct(strct));
+  std::copy(ret.begin(),ret.end(),res);
+}
+
+/*!
+ * This method returns the number of cells of unstructured sub level mesh, without building it.
+ */
+mcIdType MEDCouplingStructuredMesh::getNumberOfCellsOfSubLevelMesh() const
+{
+  std::vector<mcIdType> cgs(getCellGridStructure());
+  return GetNumberOfCellsOfSubLevelMesh(cgs,getMeshDimension());
 }
 
 /*!
  * See MEDCouplingUMesh::getDistributionOfTypes for more information
  */
-std::vector<int> MEDCouplingStructuredMesh::getDistributionOfTypes() const
+std::vector<mcIdType> MEDCouplingStructuredMesh::getDistributionOfTypes() const
 {
   //only one type of cell
-  std::vector<int> ret(3);
+  std::vector<mcIdType> ret(3);
   ret[0]=getTypeOfCell(0);
   ret[1]=getNumberOfCells();
   ret[2]=-1; //ret[3*k+2]==-1 because it has no sense here
@@ -183,15 +249,15 @@ std::vector<int> MEDCouplingStructuredMesh::getDistributionOfTypes() const
 /*!
  * This method tries to minimize at most the number of deep copy.
  * So if \a idsPerType is not empty it can be returned directly (without copy, but with ref count incremented) in return.
- * 
+ *
  * See MEDCouplingUMesh::checkTypeConsistencyAndContig for more information
  */
-DataArrayInt *MEDCouplingStructuredMesh::checkTypeConsistencyAndContig(const std::vector<int>& code, const std::vector<const DataArrayInt *>& idsPerType) const
+DataArrayIdType *MEDCouplingStructuredMesh::checkTypeConsistencyAndContig(const std::vector<mcIdType>& code, const std::vector<const DataArrayIdType *>& idsPerType) const
 {
-  int nbOfCells=getNumberOfCells();
+  mcIdType nbOfCells=getNumberOfCells();
   if(code.size()!=3)
     throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::checkTypeConsistencyAndContig : invalid input code should be exactly of size 3 !");
-  if(code[0]!=(int)getTypeOfCell(0))
+  if(code[0]!=ToIdType(getTypeOfCell(0)))
     {
       std::ostringstream oss; oss << "MEDCouplingStructuredMesh::checkTypeConsistencyAndContig : Mismatch of geometric type ! Asking for " << code[0] << " whereas the geometric type is \a this is " << getTypeOfCell(0) << " !";
       throw INTERP_KERNEL::Exception(oss.str().c_str());
@@ -209,28 +275,28 @@ DataArrayInt *MEDCouplingStructuredMesh::checkTypeConsistencyAndContig(const std
   if(code[2]!=0)
     throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::checkTypeConsistencyAndContig : single geo type mesh ! 0 or -1 is expected at pos #2 of input code !");
   if(idsPerType.size()!=1)
-    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::checkTypeConsistencyAndContig : input code points to DataArrayInt #0 whereas the size of idsPerType is not equal to 1 !");
-  const DataArrayInt *pfl=idsPerType[0];
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::checkTypeConsistencyAndContig : input code points to DataArrayIdType #0 whereas the size of idsPerType is not equal to 1 !");
+  const DataArrayIdType *pfl=idsPerType[0];
   if(!pfl)
-    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::checkTypeConsistencyAndContig : the input code points to a NULL DataArrayInt at rank 0 !");
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::checkTypeConsistencyAndContig : the input code points to a NULL DataArrayIdType at rank 0 !");
   if(pfl->getNumberOfComponents()!=1)
     throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::checkTypeConsistencyAndContig : input profile should have exactly one component !");
   pfl->checkAllIdsInRange(0,nbOfCells);
   pfl->incrRef();
-  return const_cast<DataArrayInt *>(pfl);
+  return const_cast<DataArrayIdType *>(pfl);
 }
 
 /*!
  * This method is the opposite of MEDCouplingUMesh::checkTypeConsistencyAndContig method. Given a list of cells in \a profile it returns a list of sub-profiles sorted by geo type.
  * The result is put in the array \a idsPerType. In the returned parameter \a code, foreach i \a code[3*i+2] refers (if different from -1) to a location into the \a idsPerType.
  * This method has 1 input \a profile and 3 outputs \a code \a idsInPflPerType and \a idsPerType.
- * 
+ *
  * \param [out] code is a vector of size 3*n where n is the number of different geometric type in \a this \b reduced to the profile \a profile. \a code has exactly the same semantic than in MEDCouplingUMesh::checkTypeConsistencyAndContig method.
  * \param [out] idsInPflPerType is a vector of size of different geometric type in the subpart defined by \a profile of \a this ( equal to \a code.size()/3). For each i,
  *              \a idsInPflPerType[i] stores the tuple ids in \a profile that correspond to the geometric type code[3*i+0]
  * \param [out] idsPerType is a vector of size of different sub profiles needed to be defined to represent the profile \a profile for a given geometric type.
  *              This vector can be empty in case of all geometric type cells are fully covered in ascending in the given input \a profile.
- * 
+ *
  * \warning for performance reasons no deep copy will be performed, if \a profile can been used as this in output parameters \a idsInPflPerType and \a idsPerType.
  *
  * \throw if \a profile has not exactly one component. It throws too, if \a profile contains some values not in [0,getNumberOfCells()) or if \a this is not fully defined
@@ -238,27 +304,27 @@ DataArrayInt *MEDCouplingStructuredMesh::checkTypeConsistencyAndContig(const std
  *  \b Example1: <br>
  *          - Before \a this has 3 cells \a profile contains [0,1,2]
  *          - After \a code contains [NORM_...,nbCells,-1], \a idsInPflPerType [[0,1,2]] and \a idsPerType is empty <br>
- * 
+ *
  *  \b Example2: <br>
  *          - Before \a this has 3 cells \a profile contains [1,2]
  *          - After \a code contains [NORM_...,nbCells,0], \a idsInPflPerType [[0,1]] and \a idsPerType is [[1,2]] <br>
 
  */
-void MEDCouplingStructuredMesh::splitProfilePerType(const DataArrayInt *profile, std::vector<int>& code, std::vector<DataArrayInt *>& idsInPflPerType, std::vector<DataArrayInt *>& idsPerType) const
+void MEDCouplingStructuredMesh::splitProfilePerType(const DataArrayIdType *profile, std::vector<mcIdType>& code, std::vector<DataArrayIdType *>& idsInPflPerType, std::vector<DataArrayIdType *>& idsPerType, bool smartPflKiller) const
 {
   if(!profile || !profile->isAllocated())
     throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::splitProfilePerType : input profile is NULL or not allocated !");
   if(profile->getNumberOfComponents()!=1)
     throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::splitProfilePerType : input profile should have exactly one component !");
-  int nbTuples=profile->getNumberOfTuples();
-  int nbOfCells=getNumberOfCells();
+  mcIdType nbTuples(profile->getNumberOfTuples());
+  mcIdType nbOfCells=getNumberOfCells();
   code.resize(3); idsInPflPerType.resize(1);
-  code[0]=(int)getTypeOfCell(0); code[1]=nbOfCells;
+  code[0]=ToIdType(getTypeOfCell(0)); code[1]=nbOfCells;
   idsInPflPerType.resize(1);
-  if(profile->isIdentity() && nbTuples==nbOfCells)
+  if(smartPflKiller && profile->isIota(nbOfCells))
     {
       code[2]=-1;
-      idsInPflPerType[0]=0;
+      idsInPflPerType[0]=profile->deepCopy();
       idsPerType.clear();
       return ;
     }
@@ -266,39 +332,70 @@ void MEDCouplingStructuredMesh::splitProfilePerType(const DataArrayInt *profile,
   code[2]=0;
   profile->checkAllIdsInRange(0,nbOfCells);
   idsPerType.resize(1);
-  idsPerType[0]=profile->deepCpy();
-  idsInPflPerType[0]=DataArrayInt::Range(0,nbTuples,1);
+  idsPerType[0]=profile->deepCopy();
+  idsInPflPerType[0]=DataArrayIdType::Range(0,nbTuples,1);
 }
 
 /*!
  * Creates a new unstructured mesh (MEDCoupling1SGTUMesh) from \a this structured one.
+ *
+ * In the returned mesh, the nodes are ordered with the first axis varying first: (X0,Y0), (X1,Y0),  ... (X0,Y1), (X1,Y1), ...
+ * and the cells are ordered with the same logic, i.e. in (i,j) notation: (0,0), (1,0), (2,0), ... (0,1), (1,1), ...
+ *
  *  \return MEDCouplingUMesh * - a new instance of MEDCouplingUMesh. The caller is to
- * delete this array using decrRef() as it is no more needed. 
+ * delete this array using decrRef() as it is no more needed.
  *  \throw If \a this->getMeshDimension() is not among [1,2,3].
  */
 MEDCoupling1SGTUMesh *MEDCouplingStructuredMesh::build1SGTUnstructured() const
 {
-  int meshDim=getMeshDimension(); 
-  if(meshDim<0 || meshDim>3)
-    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::build1SGTUnstructured : meshdim must be in [1,2,3] !");
-  MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> coords(getCoordinatesAndOwner());
-  int ns[3];
+  int meshDim(getMeshDimension()),spaceDim(getSpaceDimensionOnNodeStruct());
+  if((meshDim<0 || meshDim>3) || (spaceDim<0 || spaceDim>3))
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::build1SGTUnstructured : meshdim and spacedim must be in [1,2,3] !");
+  MCAuto<DataArrayDouble> coords(getCoordinatesAndOwner());
+  mcIdType ns[3];
+  getNodeGridStructure(ns);
+  MCAuto<DataArrayIdType> conn(Build1GTNodalConnectivity(ns,ns+spaceDim));
+  MCAuto<MEDCoupling1SGTUMesh> ret(MEDCoupling1SGTUMesh::New(getName(),GetGeoTypeGivenMeshDimension(meshDim)));
+  ret->setNodalConnectivity(conn); ret->setCoords(coords);
+  try
+    { ret->copyTinyInfoFrom(this); }
+  catch(INTERP_KERNEL::Exception&) { }
+  return ret.retn();
+}
+
+/*!
+ * This method returns the unstructured mesh (having single geometric type) of the sub level mesh of \a this.
+ * This method is equivalent to computing MEDCouplingUMesh::buildDescendingConnectivity on the unstructurized \a this mesh.
+ *
+ * The caller is to delete the returned mesh using decrRef() as it is no more needed.
+ */
+MEDCoupling1SGTUMesh *MEDCouplingStructuredMesh::build1SGTSubLevelMesh() const
+{
+  int meshDim(getMeshDimension());
+  if(meshDim<1 || meshDim>3)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::build1SGTSubLevelMesh : meshdim must be in [2,3] !");
+  MCAuto<DataArrayDouble> coords(getCoordinatesAndOwner());
+  mcIdType ns[3];
   getNodeGridStructure(ns);
-  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> conn(Build1GTNodalConnectivity(ns,ns+meshDim));
-  MEDCouplingAutoRefCountObjectPtr<MEDCoupling1SGTUMesh> ret(MEDCoupling1SGTUMesh::New(getName().c_str(),GetGeoTypeGivenMeshDimension(meshDim)));
+  MCAuto<DataArrayIdType> conn(Build1GTNodalConnectivityOfSubLevelMesh(ns,ns+meshDim));
+  MCAuto<MEDCoupling1SGTUMesh> ret(MEDCoupling1SGTUMesh::New(getName(),GetGeoTypeGivenMeshDimension(meshDim-1)));
   ret->setNodalConnectivity(conn); ret->setCoords(coords);
   return ret.retn();
 }
 
 /*!
  * Creates a new unstructured mesh (MEDCouplingUMesh) from \a this structured one.
+ *
+ * In the returned mesh, the nodes are ordered with the first axis varying first: (X0,Y0), (X1,Y0),  ... (X0,Y1), (X1,Y1), ...
+ * and the cells are ordered with the same logic, i.e. in (i,j) notation: (0,0), (1,0), (2,0), ... (0,1), (1,1), ...
+ *
  *  \return MEDCouplingUMesh * - a new instance of MEDCouplingUMesh. The caller is to
- * delete this array using decrRef() as it is no more needed. 
+ * delete this array using decrRef() as it is no more needed.
  *  \throw If \a this->getMeshDimension() is not among [1,2,3].
  */
 MEDCouplingUMesh *MEDCouplingStructuredMesh::buildUnstructured() const
 {
-  MEDCouplingAutoRefCountObjectPtr<MEDCoupling1SGTUMesh> ret0(build1SGTUnstructured());
+  MCAuto<MEDCoupling1SGTUMesh> ret0(build1SGTUnstructured());
   return ret0->buildUnstructured();
 }
 
@@ -310,44 +407,40 @@ MEDCouplingUMesh *MEDCouplingStructuredMesh::buildUnstructured() const
  *  \param [in] end - specifies the end of the array \a start, so that
  *              the last value of \a start is \a end[ -1 ].
  *  \return MEDCouplingMesh * - a new instance of MEDCouplingUMesh. The caller is to
- *         delete this mesh using decrRef() as it is no more needed. 
+ *         delete this mesh using decrRef() as it is no more needed.
  */
-MEDCouplingMesh *MEDCouplingStructuredMesh::buildPart(const int *start, const int *end) const
+MEDCouplingMesh *MEDCouplingStructuredMesh::buildPart(const mcIdType *start, const mcIdType *end) const
 {
-  MEDCouplingUMesh *um=buildUnstructured();
-  MEDCouplingMesh *ret=um->buildPart(start,end);
-  um->decrRef();
-  return ret;
+  MCAuto<MEDCouplingUMesh> um(buildUnstructured());
+  return um->buildPart(start,end);
 }
 
-MEDCouplingMesh *MEDCouplingStructuredMesh::buildPartAndReduceNodes(const int *start, const int *end, DataArrayInt*& arr) const
+MEDCouplingMesh *MEDCouplingStructuredMesh::buildPartAndReduceNodes(const mcIdType *start, const mcIdType *end, DataArrayIdType*& arr) const
 {
-  std::vector<int> cgs(getCellGridStructure());
-  std::vector< std::pair<int,int> > cellPartFormat,nodePartFormat;
+  std::vector<mcIdType> cgs(getCellGridStructure());
+  std::vector< std::pair<mcIdType,mcIdType> > cellPartFormat,nodePartFormat;
   if(IsPartStructured(start,end,cgs,cellPartFormat))
     {
-      MEDCouplingAutoRefCountObjectPtr<MEDCouplingStructuredMesh> ret(buildStructuredSubPart(cellPartFormat));
+      MCAuto<MEDCouplingStructuredMesh> ret(buildStructuredSubPart(cellPartFormat));
       nodePartFormat=cellPartFormat;
-      for(std::vector< std::pair<int,int> >::iterator it=nodePartFormat.begin();it!=nodePartFormat.end();it++)
+      for(std::vector< std::pair<mcIdType,mcIdType> >::iterator it=nodePartFormat.begin();it!=nodePartFormat.end();it++)
         (*it).second++;
-      MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp1(BuildExplicitIdsFrom(getNodeGridStructure(),nodePartFormat));
-      MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp2(DataArrayInt::New()); tmp2->alloc(getNumberOfNodes(),1);
+      MCAuto<DataArrayIdType> tmp1(BuildExplicitIdsFrom(getNodeGridStructure(),nodePartFormat));
+      MCAuto<DataArrayIdType> tmp2(DataArrayIdType::New()); tmp2->alloc(getNumberOfNodes(),1);
       tmp2->fillWithValue(-1);
-      MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp3(DataArrayInt::New()); tmp3->alloc(tmp1->getNumberOfTuples(),1); tmp3->iota(0);
+      MCAuto<DataArrayIdType> tmp3(DataArrayIdType::New()); tmp3->alloc(tmp1->getNumberOfTuples(),1); tmp3->iota(0);
       tmp2->setPartOfValues3(tmp3,tmp1->begin(),tmp1->end(),0,1,1);
       arr=tmp2.retn();
       return ret.retn();
     }
   else
     {
-      MEDCouplingUMesh *um=buildUnstructured();
-      MEDCouplingMesh *ret=um->buildPartAndReduceNodes(start,end,arr);
-      um->decrRef();
-      return ret;
+      MCAuto<MEDCouplingUMesh> um(buildUnstructured());
+      return um->buildPartAndReduceNodes(start,end,arr);
     }
 }
 
-DataArrayInt *MEDCouplingStructuredMesh::simplexize(int policy)
+DataArrayIdType *MEDCouplingStructuredMesh::simplexize(int policy)
 {
   throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::simplexize : not available for Cartesian mesh !");
 }
@@ -364,22 +457,21 @@ MEDCouplingFieldDouble *MEDCouplingStructuredMesh::buildOrthogonalField() const
 {
   if(getMeshDimension()!=2)
     throw INTERP_KERNEL::Exception("Expected a MEDCouplingStructuredMesh with meshDim == 2 !");
-  MEDCouplingFieldDouble *ret=MEDCouplingFieldDouble::New(ON_CELLS,NO_TIME);
-  DataArrayDouble *array=DataArrayDouble::New();
-  int nbOfCells=getNumberOfCells();
+  MCAuto<MEDCouplingFieldDouble> ret(MEDCouplingFieldDouble::New(ON_CELLS,NO_TIME));
+  MCAuto<DataArrayDouble> array(DataArrayDouble::New());
+  mcIdType nbOfCells=getNumberOfCells();
   array->alloc(nbOfCells,3);
-  double *vals=array->getPointer();
-  for(int i=0;i<nbOfCells;i++)
+  double *vals(array->getPointer());
+  for(mcIdType i=0;i<nbOfCells;i++)
     { vals[3*i]=0.; vals[3*i+1]=0.; vals[3*i+2]=1.; }
   ret->setArray(array);
-  array->decrRef();
   ret->setMesh(this);
-  return ret;
+  return ret.retn();
 }
 
-void MEDCouplingStructuredMesh::getReverseNodalConnectivity(DataArrayInt *revNodal, DataArrayInt *revNodalIndx) const
+void MEDCouplingStructuredMesh::getReverseNodalConnectivity(DataArrayIdType *revNodal, DataArrayIdType *revNodalIndx) const
 {
-  std::vector<int> ngs(getNodeGridStructure());
+  std::vector<mcIdType> ngs(getNodeGridStructure());
   int dim(getSpaceDimension());
   switch(dim)
   {
@@ -394,18 +486,18 @@ void MEDCouplingStructuredMesh::getReverseNodalConnectivity(DataArrayInt *revNod
   }
 }
 
-void MEDCouplingStructuredMesh::GetReverseNodalConnectivity1(const std::vector<int>& ngs, DataArrayInt *revNodal, DataArrayInt *revNodalIndx)
+void MEDCouplingStructuredMesh::GetReverseNodalConnectivity1(const std::vector<mcIdType>& ngs, DataArrayIdType *revNodal, DataArrayIdType *revNodalIndx)
 {
-  int nbNodes(ngs[0]);
+  mcIdType nbNodes(ngs[0]);
   revNodalIndx->alloc(nbNodes+1,1);
   if(nbNodes==0)
     { revNodal->alloc(0,1); revNodalIndx->setIJ(0,0,0); return ; }
   if(nbNodes==1)
     { revNodal->alloc(1,1); revNodal->setIJ(0,0,0); revNodalIndx->setIJ(0,0,0); revNodalIndx->setIJ(1,0,1); return ; }
   revNodal->alloc(2*(nbNodes-1),1);
-  int *rn(revNodal->getPointer()),*rni(revNodalIndx->getPointer());
+  mcIdType *rn(revNodal->getPointer()),*rni(revNodalIndx->getPointer());
   *rni++=0; *rni=1; *rn++=0;
-  for(int i=1;i<nbNodes-1;i++,rni++)
+  for(mcIdType i=1;i<nbNodes-1;i++,rni++)
     {
       rn[0]=i-1; rn[1]=i;
       rni[1]=rni[0]+2;
@@ -414,32 +506,32 @@ void MEDCouplingStructuredMesh::GetReverseNodalConnectivity1(const std::vector<i
   rn[0]=nbNodes-2; rni[1]=rni[0]+1;
 }
 
-void MEDCouplingStructuredMesh::GetReverseNodalConnectivity2(const std::vector<int>& ngs, DataArrayInt *revNodal, DataArrayInt *revNodalIndx)
+void MEDCouplingStructuredMesh::GetReverseNodalConnectivity2(const std::vector<mcIdType>& ngs, DataArrayIdType *revNodal, DataArrayIdType *revNodalIndx)
 {
-  int nbNodesX(ngs[0]),nbNodesY(ngs[1]);
-  int nbNodes(nbNodesX*nbNodesY);
+  mcIdType nbNodesX(ngs[0]),nbNodesY(ngs[1]);
+  mcIdType nbNodes(nbNodesX*nbNodesY);
   if(nbNodesX==0 || nbNodesY==0)
     { revNodal->alloc(0,1); revNodalIndx->setIJ(0,0,0); return ; }
   if(nbNodesX==1 || nbNodesY==1)
-    { std::vector<int> ngs2(1); ngs2[0]=std::max(nbNodesX,nbNodesY); return GetReverseNodalConnectivity1(ngs2,revNodal,revNodalIndx); }
+    { std::vector<mcIdType> ngs2(1); ngs2[0]=std::max(nbNodesX,nbNodesY); return GetReverseNodalConnectivity1(ngs2,revNodal,revNodalIndx); }
   revNodalIndx->alloc(nbNodes+1,1);
-  int nbCellsX(nbNodesX-1),nbCellsY(nbNodesY-1);
+  mcIdType nbCellsX(nbNodesX-1),nbCellsY(nbNodesY-1);
   revNodal->alloc(4*(nbNodesX-2)*(nbNodesY-2)+2*2*(nbNodesX-2)+2*2*(nbNodesY-2)+4,1);
-  int *rn(revNodal->getPointer()),*rni(revNodalIndx->getPointer());
+  mcIdType *rn(revNodal->getPointer()),*rni(revNodalIndx->getPointer());
   *rni++=0; *rni=1; *rn++=0;
-  for(int i=1;i<nbNodesX-1;i++,rni++,rn+=2)
+  for(mcIdType i=1;i<nbNodesX-1;i++,rni++,rn+=2)
     {
       rn[0]=i-1; rn[1]=i;
       rni[1]=rni[0]+2;
     }
   rni[1]=rni[0]+1; *rn++=nbCellsX-1;
   rni++;
-  for(int j=1;j<nbNodesY-1;j++)
+  for(mcIdType j=1;j<nbNodesY-1;j++)
     {
-      int off(nbCellsX*(j-1)),off2(nbCellsX*j);
+      mcIdType off(nbCellsX*(j-1)),off2(nbCellsX*j);
       rni[1]=rni[0]+2; rn[0]=off; rn[1]=off2;
       rni++; rn+=2;
-      for(int i=1;i<nbNodesX-1;i++,rni++,rn+=4)
+      for(mcIdType i=1;i<nbNodesX-1;i++,rni++,rn+=4)
         {
           rn[0]=i-1+off; rn[1]=i+off; rn[2]=i-1+off2; rn[3]=i+off2;
           rni[1]=rni[0]+4;
@@ -447,10 +539,10 @@ void MEDCouplingStructuredMesh::GetReverseNodalConnectivity2(const std::vector<i
       rni[1]=rni[0]+2; rn[0]=off+nbCellsX-1; rn[1]=off2+nbCellsX-1;
       rni++; rn+=2;
     }
-  int off3(nbCellsX*(nbCellsY-1));
+  mcIdType off3(nbCellsX*(nbCellsY-1));
   rni[1]=rni[0]+1;
   rni++; *rn++=off3;
-  for(int i=1;i<nbNodesX-1;i++,rni++,rn+=2)
+  for(mcIdType i=1;i<nbNodesX-1;i++,rni++,rn+=2)
     {
       rn[0]=i-1+off3; rn[1]=i+off3;
       rni[1]=rni[0]+2;
@@ -458,16 +550,16 @@ void MEDCouplingStructuredMesh::GetReverseNodalConnectivity2(const std::vector<i
   rni[1]=rni[0]+1; rn[0]=nbCellsX*nbCellsY-1;
 }
 
-void MEDCouplingStructuredMesh::GetReverseNodalConnectivity3(const std::vector<int>& ngs, DataArrayInt *revNodal, DataArrayInt *revNodalIndx)
+void MEDCouplingStructuredMesh::GetReverseNodalConnectivity3(const std::vector<mcIdType>& ngs, DataArrayIdType *revNodal, DataArrayIdType *revNodalIndx)
 {
-  int nbNodesX(ngs[0]),nbNodesY(ngs[1]),nbNodesZ(ngs[2]);
-  int nbNodes(nbNodesX*nbNodesY*nbNodesZ);
+  mcIdType nbNodesX(ngs[0]),nbNodesY(ngs[1]),nbNodesZ(ngs[2]);
+  mcIdType nbNodes(nbNodesX*nbNodesY*nbNodesZ);
   if(nbNodesX==0 || nbNodesY==0 || nbNodesZ==0)
     { revNodal->alloc(0,1); revNodalIndx->setIJ(0,0,0); return ; }
   if(nbNodesX==1 || nbNodesY==1 || nbNodesZ==1)
     {
-      std::vector<int> ngs2(2);
-      int pos(0);
+      std::vector<mcIdType> ngs2(2);
+      mcIdType pos(0);
       bool pass(false);
       for(int i=0;i<3;i++)
         {
@@ -483,21 +575,21 @@ void MEDCouplingStructuredMesh::GetReverseNodalConnectivity3(const std::vector<i
       return GetReverseNodalConnectivity2(ngs2,revNodal,revNodalIndx);
     }
   revNodalIndx->alloc(nbNodes+1,1);
-  int nbCellsX(nbNodesX-1),nbCellsY(nbNodesY-1),nbCellsZ(nbNodesZ-1);
+  mcIdType nbCellsX(nbNodesX-1),nbCellsY(nbNodesY-1),nbCellsZ(nbNodesZ-1);
   revNodal->alloc(8*(nbNodesX-2)*(nbNodesY-2)*(nbNodesZ-2)+4*(2*(nbNodesX-2)*(nbNodesY-2)+2*(nbNodesX-2)*(nbNodesZ-2)+2*(nbNodesY-2)*(nbNodesZ-2))+2*4*(nbNodesX-2)+2*4*(nbNodesY-2)+2*4*(nbNodesZ-2)+8,1);
-  int *rn(revNodal->getPointer()),*rni(revNodalIndx->getPointer());
+  mcIdType *rn(revNodal->getPointer()),*rni(revNodalIndx->getPointer());
   *rni=0;
-  for(int k=0;k<nbNodesZ;k++)
+  for(mcIdType k=0;k<nbNodesZ;k++)
     {
       bool factZ(k!=0 && k!=nbNodesZ-1);
-      int offZ0((k-1)*nbCellsX*nbCellsY),offZ1(k*nbCellsX*nbCellsY);
-      for(int j=0;j<nbNodesY;j++)
+      mcIdType offZ0((k-1)*nbCellsX*nbCellsY),offZ1(k*nbCellsX*nbCellsY);
+      for(mcIdType j=0;j<nbNodesY;j++)
         {
           bool factYZ(factZ && (j!=0 && j!=nbNodesY-1));
-          int off00((j-1)*nbCellsX+offZ0),off01(j*nbCellsX+offZ0),off10((j-1)*nbCellsX+offZ1),off11(j*nbCellsX+offZ1);
-          for(int i=0;i<nbNodesX;i++,rni++)
+          mcIdType off00((j-1)*nbCellsX+offZ0),off01(j*nbCellsX+offZ0),off10((j-1)*nbCellsX+offZ1),off11(j*nbCellsX+offZ1);
+          for(mcIdType i=0;i<nbNodesX;i++,rni++)
             {
-              int fact(factYZ && (i!=0 && i!=nbNodesX-1));
+              mcIdType fact(factYZ && (i!=0 && i!=nbNodesX-1));
               if(fact)
                 {//most of points fall in this part of code
                   rn[0]=off00+i-1; rn[1]=off00+i; rn[2]=off01+i-1; rn[3]=off01+i;
@@ -507,7 +599,7 @@ void MEDCouplingStructuredMesh::GetReverseNodalConnectivity3(const std::vector<i
                 }
               else
                 {
-                  int *rnRef(rn);
+                  mcIdType *rnRef(rn);
                   if(k>=1 && j>=1 && i>=1)
                     *rn++=off00+i-1;
                   if(k>=1 && j>=1 && i<nbCellsX)
@@ -525,7 +617,7 @@ void MEDCouplingStructuredMesh::GetReverseNodalConnectivity3(const std::vector<i
                     *rn++=off11+i-1;
                   if(k<nbCellsZ && j<nbCellsY && i<nbCellsX)
                     *rn++=off11+i;
-                  rni[1]=rni[0]+(int)(std::distance(rnRef,rn));
+                  rni[1]=rni[0]+ToIdType(std::distance(rnRef,rn));
                 }
             }
         }
@@ -533,37 +625,351 @@ void MEDCouplingStructuredMesh::GetReverseNodalConnectivity3(const std::vector<i
 }
 
 /*!
- * \return DataArrayInt * - newly allocated instance of nodal connectivity compatible for MEDCoupling1SGTMesh instance
+ * \return DataArrayIdType * - newly allocated instance of nodal connectivity compatible for MEDCoupling1SGTMesh instance
  */
-DataArrayInt *MEDCouplingStructuredMesh::Build1GTNodalConnectivity(const int *nodeStBg, const int *nodeStEnd)
+DataArrayIdType *MEDCouplingStructuredMesh::Build1GTNodalConnectivity(const mcIdType *nodeStBg, const mcIdType *nodeStEnd)
 {
-  std::size_t dim=std::distance(nodeStBg,nodeStEnd);
+  mcIdType zippedNodeSt[3];
+  mcIdType dim(ZipNodeStructure(nodeStBg,nodeStEnd,zippedNodeSt));
   switch(dim)
-    {
+  {
     case 0:
       {
-        MEDCouplingAutoRefCountObjectPtr<DataArrayInt> conn(DataArrayInt::New());
+        MCAuto<DataArrayIdType> conn(DataArrayIdType::New());
         conn->alloc(1,1); conn->setIJ(0,0,0);
         return conn.retn();
       }
     case 1:
-      return Build1GTNodalConnectivity1D(nodeStBg);
+      return Build1GTNodalConnectivity1D(zippedNodeSt);
     case 2:
-      return Build1GTNodalConnectivity2D(nodeStBg);
+      return Build1GTNodalConnectivity2D(zippedNodeSt);
     case 3:
-      return Build1GTNodalConnectivity3D(nodeStBg);
+      return Build1GTNodalConnectivity3D(zippedNodeSt);
     default:
       throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::Build1GTNodalConnectivity : only dimension in [0,1,2,3] supported !");
+  }
+}
+
+DataArrayIdType *MEDCouplingStructuredMesh::Build1GTNodalConnectivityOfSubLevelMesh(const mcIdType *nodeStBg, const mcIdType *nodeStEnd)
+{
+  std::size_t dim(std::distance(nodeStBg,nodeStEnd));
+  switch(dim)
+  {
+    case 3:
+      return Build1GTNodalConnectivityOfSubLevelMesh3D(nodeStBg);
+    case 2:
+      return Build1GTNodalConnectivityOfSubLevelMesh2D(nodeStBg);
+    default:
+      throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::Build1GTNodalConnectivityOfSubLevelMesh: only dimension in [2,3] supported !");
+  }
+}
+
+/*!
+ * This method returns the list of ids sorted ascendingly of entities that are in the corner in ghost zone.
+ * The ids are returned in a newly created DataArrayIdType having a single component.
+ *
+ * \param [in] st - The structure \b without ghost cells.
+ * \param [in] ghostLev - The size of the ghost zone (>=0)
+ * \return DataArrayIdType * - The DataArray containing all the ids the caller is to deallocate.
+ */
+DataArrayIdType *MEDCouplingStructuredMesh::ComputeCornersGhost(const std::vector<mcIdType>& st, mcIdType ghostLev)
+{
+  if(ghostLev<0)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ComputeCornersGhost : ghost lev must be >= 0 !");
+  std::size_t dim(st.size());
+  MCAuto<DataArrayIdType> ret(DataArrayIdType::New());
+  switch(dim)
+  {
+    case 1:
+      {
+        ret->alloc(2*ghostLev,1);
+        mcIdType *ptr(ret->getPointer());
+        for(mcIdType i=0;i<ghostLev;i++,ptr++)
+          *ptr=i;
+        mcIdType offset(st[0]);
+        if(offset<0)
+          throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ComputeCornersGhost : element in 1D structure must be >= 0 !");
+        for(mcIdType i=0;i<ghostLev;i++,ptr++)
+          *ptr=offset+ghostLev+i;
+        break;
+      }
+    case 2:
+      {
+        mcIdType offsetX(st[0]),offsetY(st[1]);
+        if(offsetX<0 || offsetY<0)
+          throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ComputeCornersGhost : elements in 2D structure must be >= 0 !");
+        ret->alloc(4*ghostLev,1);
+        mcIdType *ptr(ret->getPointer());
+        for(mcIdType i=0;i<ghostLev;i++)
+          {
+            *ptr++=i*(2*ghostLev+offsetX+1);
+            *ptr++=offsetX+2*ghostLev-1+i*(2*ghostLev+offsetX-1);
+          }
+        for(mcIdType i=0;i<ghostLev;i++)
+          {
+            *ptr++=(2*ghostLev+offsetX)*(offsetY+ghostLev)+ghostLev-1+i*(2*ghostLev+offsetX-1);
+            *ptr++=(2*ghostLev+offsetX)*(offsetY+ghostLev)+offsetX+ghostLev+i*(2*ghostLev+offsetX+1);
+          }
+        break;
+      }
+    case 3:
+      {
+        mcIdType offsetX(st[0]),offsetY(st[1]),offsetZ(st[2]);
+        if(offsetX<0 || offsetY<0 || offsetZ<0)
+          throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ComputeCornersGhost : elements in 3D structure must be >= 0 !");
+        ret->alloc(8*ghostLev,1);
+        mcIdType *ptr(ret->getPointer());
+        mcIdType zeOffsetZ((offsetX+2*ghostLev)*(offsetY+2*ghostLev));
+        for(mcIdType i=0;i<ghostLev;i++)
+          {
+            *ptr++=i*(2*ghostLev+offsetX+1)+i*zeOffsetZ;
+            *ptr++=offsetX+2*ghostLev-1+i*(2*ghostLev+offsetX-1)+i*zeOffsetZ;
+            *ptr++=(2*ghostLev+offsetX)*(offsetY+ghostLev)+ghostLev-1+(ghostLev-i-1)*(2*ghostLev+offsetX-1)+i*zeOffsetZ;
+            *ptr++=(2*ghostLev+offsetX)*(offsetY+ghostLev)+offsetX+ghostLev+(ghostLev-i-1)*(2*ghostLev+offsetX+1)+i*zeOffsetZ;
+          }
+        mcIdType j(0),zeOffsetZ2(zeOffsetZ*(offsetZ+ghostLev));
+        for(mcIdType i=ghostLev-1;i>=0;i--,j++)
+          {
+            *ptr++=i*(2*ghostLev+offsetX+1)+j*zeOffsetZ+zeOffsetZ2;
+            *ptr++=offsetX+2*ghostLev-1+i*(2*ghostLev+offsetX-1)+j*zeOffsetZ+zeOffsetZ2;
+            *ptr++=(2*ghostLev+offsetX)*(offsetY+ghostLev)+ghostLev-1+(ghostLev-i-1)*(2*ghostLev+offsetX-1)+j*zeOffsetZ+zeOffsetZ2;
+            *ptr++=(2*ghostLev+offsetX)*(offsetY+ghostLev)+offsetX+ghostLev+(ghostLev-i-1)*(2*ghostLev+offsetX+1)+j*zeOffsetZ+zeOffsetZ2;
+          }
+        break;
+      }
+    default:
+      throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ComputeCornersGhost : Only dimensions 1, 2 and 3 are supported actually !");
+  }
+  return ret.retn();
+}
+
+/*!
+ * This method retrieves the number of entities (it can be cells or nodes) given a range in compact standard format
+ * used in methods like BuildExplicitIdsFrom,IsPartStructured.
+ *
+ * \sa BuildExplicitIdsFrom,IsPartStructured
+ */
+mcIdType MEDCouplingStructuredMesh::DeduceNumberOfGivenRangeInCompactFrmt(const std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat)
+{
+  mcIdType ret(1);
+  std::size_t ii(0);
+  for(std::vector< std::pair<mcIdType,mcIdType> >::const_iterator it=partCompactFormat.begin();it!=partCompactFormat.end();it++,ii++)
+    {
+      mcIdType a((*it).first),b((*it).second);
+      if(a<0 || b<0 || b-a<0)
+        {
+          std::ostringstream oss; oss << "MEDCouplingStructuredMesh::DeduceNumberOfGivenRangeInCompactFrmt : invalid input at dimension " << ii << " !";
+          throw INTERP_KERNEL::Exception(oss.str().c_str());
+        }
+      ret*=(b-a);
+    }
+  return ret;
+}
+
+mcIdType MEDCouplingStructuredMesh::DeduceNumberOfGivenStructure(const std::vector<mcIdType>& st)
+{
+  mcIdType ret(1);
+  bool isFetched(false);
+  for(std::size_t i=0;i<st.size();i++)
+    {
+      if(st[i]<0)
+        throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::DeduceNumberOfGivenStructure : presence of a negative value in structure !");
+      ret*=st[i];
+      isFetched=true;
+    }
+  return isFetched?ret:0;
+}
+
+void MEDCouplingStructuredMesh::FindTheWidestAxisOfGivenRangeInCompactFrmt(const std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat, int& axisId, mcIdType& sizeOfRange)
+{
+    mcIdType dim(ToIdType(partCompactFormat.size()));
+    mcIdType ret(-1);
+    for(int i=0;i<dim;i++)
+      {
+        mcIdType curDelta(partCompactFormat[i].second-partCompactFormat[i].first);
+        if(curDelta<0)
+          {
+            std::ostringstream oss; oss << "MEDCouplingStructuredMesh::FindTheWidestAxisOfGivenRangeInCompactFrmt : at axis #" << i << " the range is invalid (first value < second value) !";
+            throw INTERP_KERNEL::Exception(oss.str().c_str());
+          }
+        if(curDelta>ret)
+          {
+            axisId=i; sizeOfRange=curDelta;
+            ret=curDelta;
+          }
+      }
+}
+
+/*!
+ * This method is \b NOT wrapped in python because it has no sense in python (for performance reasons).
+ * This method starts from a structured mesh with structure \a st on which a boolean field \a crit is set.
+ * This method find for such minimalist information of mesh and field which is the part of the mesh, given by the range per axis in output parameter
+ * \a partCompactFormat that contains all the True in \a crit. The returned vector of boolean is the field reduced to that part.
+ * So the number of True is equal in \a st and in returned vector of boolean.
+ *
+ * \param [in] minPatchLgth - minimum length that the patch may have for all directions.
+ * \param [in] st - The structure per axis of the structured mesh considered.
+ * \param [in] crit - The field of boolean (for performance reasons) lying on the mesh defined by \a st.
+ * \param [out] partCompactFormat - The minimal part of \a st containing all the true of \a crit.
+ * \param [out] reducedCrit - The reduction of \a criterion on \a partCompactFormat.
+ * \return - The number of True in \a st (that is equal to those in \a reducedCrit)
+ */
+mcIdType MEDCouplingStructuredMesh::FindMinimalPartOf(mcIdType minPatchLgth, const std::vector<mcIdType>& st, const std::vector<bool>& crit, std::vector<bool>& reducedCrit, std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat)
+{
+  if(minPatchLgth<0)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::FindMinimalPartOf : the input minPatchLgth has to be >=0 !");
+  if(ToIdType(crit.size())!=DeduceNumberOfGivenStructure(st))
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::FindMinimalPartOf : size of vector of boolean is invalid regarding the declared structure !");
+  mcIdType ret(-1);
+  switch(st.size())
+  {
+    case 1:
+      {
+        ret=FindMinimalPartOf1D(st,crit,partCompactFormat);
+        break;
+      }
+    case 2:
+      {
+        ret=FindMinimalPartOf2D(st,crit,partCompactFormat);
+        break;
+      }
+    case 3:
+      {
+        ret=FindMinimalPartOf3D(st,crit,partCompactFormat);
+        break;
+      }
+    default:
+      throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::FindMinimalPartOf : only dimension 1, 2 and 3 are supported actually !");
+  }
+  std::vector<mcIdType> dims(MEDCouplingStructuredMesh::GetDimensionsFromCompactFrmt(partCompactFormat));
+  mcIdType i(0);
+  for(std::vector< std::pair<mcIdType,mcIdType> >::iterator it=partCompactFormat.begin();it!=partCompactFormat.end();it++,i++)
+    {
+      if(st[i]<minPatchLgth)
+        throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::FindMinimalPartOf : the input patch is tinier than the min length constraint !");
+      mcIdType start((*it).first),stop((*it).second),middle((start+stop)/2);
+      if(stop-start<minPatchLgth)
+        {
+          (*it).first=middle-minPatchLgth/2;
+          (*it).second=middle+minPatchLgth-minPatchLgth/2;
+          if((*it).first<0)
+            {
+              (*it).second+=-(*it).first;
+              (*it).first=0;
+            }
+          if((*it).second>st[i])
+            {
+              (*it).first-=(*it).second-st[i];
+              (*it).second=st[i];
+            }
+        }
     }
+  ExtractFieldOfBoolFrom(st,crit,partCompactFormat,reducedCrit);
+  return ret;
+}
+
+/*!
+ * This method is \b NOT wrapped in python.
+ * This method considers \a crit input parameter as a matrix having dimensions specified by \a st. This method returns for each axis
+ * the signature, that is to say the number of elems equal to true in \a crit along this axis.
+ */
+std::vector< std::vector<mcIdType> > MEDCouplingStructuredMesh::ComputeSignaturePerAxisOf(const std::vector<mcIdType>& st, const std::vector<bool>& crit)
+{
+  std::size_t dim(st.size());
+  std::vector< std::vector<mcIdType> > ret(dim);
+  switch(dim)
+  {
+    case 1:
+      {
+        mcIdType nx(st[0]);
+        ret[0].resize(nx);
+        std::vector<mcIdType>& retX(ret[0]);
+        for(mcIdType i=0;i<nx;i++)
+          retX[i]=crit[i]?1:0;
+        break;
+      }
+    case 2:
+      {
+        mcIdType nx(st[0]),ny(st[1]);
+        ret[0].resize(nx); ret[1].resize(ny);
+        std::vector<mcIdType>& retX(ret[0]);
+        for(mcIdType i=0;i<nx;i++)
+          {
+            mcIdType cnt(0);
+            for(mcIdType j=0;j<ny;j++)
+              if(crit[j*nx+i])
+                cnt++;
+            retX[i]=cnt;
+          }
+        std::vector<mcIdType>& retY(ret[1]);
+        for(mcIdType j=0;j<ny;j++)
+          {
+            mcIdType cnt(0);
+            for(mcIdType i=0;i<nx;i++)
+              if(crit[j*nx+i])
+                cnt++;
+            retY[j]=cnt;
+          }
+        break;
+      }
+    case 3:
+      {
+        mcIdType nx(st[0]),ny(st[1]),nz(st[2]);
+        ret[0].resize(nx); ret[1].resize(ny); ret[2].resize(nz);
+        std::vector<mcIdType>& retX(ret[0]);
+        for(mcIdType i=0;i<nx;i++)
+          {
+            mcIdType cnt(0);
+            for(mcIdType k=0;k<nz;k++)
+              {
+                mcIdType offz(k*nx*ny+i);
+                for(mcIdType j=0;j<ny;j++)
+                  if(crit[offz+j*nx])
+                    cnt++;
+              }
+            retX[i]=cnt;
+          }
+        std::vector<mcIdType>& retY(ret[1]);
+        for(mcIdType j=0;j<ny;j++)
+          {
+            mcIdType cnt(0),offy(j*nx);
+            for(mcIdType k=0;k<nz;k++)
+              {
+                mcIdType offz(k*nx*ny+offy);
+                for(mcIdType i=0;i<nx;i++)
+                  if(crit[offz+i])
+                    cnt++;
+              }
+            retY[j]=cnt;
+          }
+        std::vector<mcIdType>& retZ(ret[2]);
+        for(mcIdType k=0;k<nz;k++)
+          {
+            mcIdType cnt(0),offz(k*nx*ny);
+            for(mcIdType j=0;j<ny;j++)
+              {
+                mcIdType offy(offz+j*nx);
+                for(mcIdType i=0;i<nx;i++)
+                  if(crit[offy+i])
+                    cnt++;
+              }
+            retZ[k]=cnt;
+          }
+        break;
+      }
+    default:
+       throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ComputeSignatureOf : only dimensions 1, 2 and 3 are supported !");
+  }
+  return ret;
 }
 
-DataArrayInt *MEDCouplingStructuredMesh::Build1GTNodalConnectivity1D(const int *nodeStBg)
+DataArrayIdType *MEDCouplingStructuredMesh::Build1GTNodalConnectivity1D(const mcIdType *nodeStBg)
 {
-  int nbOfCells(*nodeStBg-1);
-  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> conn(DataArrayInt::New());
+  mcIdType nbOfCells=*nodeStBg-1;
+  MCAuto<DataArrayIdType> conn(DataArrayIdType::New());
   conn->alloc(2*nbOfCells,1);
-  int *cp=conn->getPointer();
-  for(int i=0;i<nbOfCells;i++)
+  mcIdType *cp=conn->getPointer();
+  for(mcIdType i=0;i<nbOfCells;i++)
     {
       cp[2*i+0]=i;
       cp[2*i+1]=i+1;
@@ -571,39 +977,36 @@ DataArrayInt *MEDCouplingStructuredMesh::Build1GTNodalConnectivity1D(const int *
   return conn.retn();
 }
 
-DataArrayInt *MEDCouplingStructuredMesh::Build1GTNodalConnectivity2D(const int *nodeStBg)
+DataArrayIdType *MEDCouplingStructuredMesh::Build1GTNodalConnectivity2D(const mcIdType *nodeStBg)
 {
-  int n1=nodeStBg[0]-1;
-  int n2=nodeStBg[1]-1;
-  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> conn(DataArrayInt::New());
+  mcIdType n1(nodeStBg[0]-1),n2(nodeStBg[1]-1);
+  MCAuto<DataArrayIdType> conn(DataArrayIdType::New());
   conn->alloc(4*n1*n2,1);
-  int *cp=conn->getPointer();
-  int pos=0;
-  for(int j=0;j<n2;j++)
-    for(int i=0;i<n1;i++,pos++)
+  mcIdType *cp(conn->getPointer());
+  std::size_t pos(0);
+  for(mcIdType j=0;j<n2;j++)
+    for(mcIdType i=0;i<n1;i++,pos++)
       {
         cp[4*pos+0]=i+1+j*(n1+1);
         cp[4*pos+1]=i+j*(n1+1);
         cp[4*pos+2]=i+(j+1)*(n1+1);
         cp[4*pos+3]=i+1+(j+1)*(n1+1);
-    }
+      }
   return conn.retn();
 }
 
-DataArrayInt *MEDCouplingStructuredMesh::Build1GTNodalConnectivity3D(const int *nodeStBg)
+DataArrayIdType *MEDCouplingStructuredMesh::Build1GTNodalConnectivity3D(const mcIdType *nodeStBg)
 {
-  int n1=nodeStBg[0]-1;
-  int n2=nodeStBg[1]-1;
-  int n3=nodeStBg[2]-1;
-  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> conn(DataArrayInt::New());
+  mcIdType n1(nodeStBg[0]-1),n2(nodeStBg[1]-1),n3(nodeStBg[2]-1);
+  MCAuto<DataArrayIdType> conn(DataArrayIdType::New());
   conn->alloc(8*n1*n2*n3,1);
-  int *cp=conn->getPointer();
-  int pos=0;
-  for(int k=0;k<n3;k++)
-    for(int j=0;j<n2;j++)
-      for(int i=0;i<n1;i++,pos++)
+  mcIdType *cp(conn->getPointer());
+  std::size_t pos(0);
+  for(mcIdType k=0;k<n3;k++)
+    for(mcIdType j=0;j<n2;j++)
+      for(mcIdType i=0;i<n1;i++,pos++)
         {
-          int tmp=(n1+1)*(n2+1);
+          mcIdType tmp=(n1+1)*(n2+1);
           cp[8*pos+0]=i+1+j*(n1+1)+k*tmp;
           cp[8*pos+1]=i+j*(n1+1)+k*tmp;
           cp[8*pos+2]=i+(j+1)*(n1+1)+k*tmp;
@@ -616,72 +1019,377 @@ DataArrayInt *MEDCouplingStructuredMesh::Build1GTNodalConnectivity3D(const int *
   return conn.retn();
 }
 
-/*!
- * Returns a cell id by its (i,j,k) index. The cell is located between the i-th and
- * ( i + 1 )-th nodes along X axis etc.
- *  \param [in] i - a index of node coordinates array along X axis.
- *  \param [in] j - a index of node coordinates array along Y axis.
- *  \param [in] k - a index of node coordinates array along Z axis.
- *  \return int - a cell id in \a this mesh.
- */
-int MEDCouplingStructuredMesh::getCellIdFromPos(int i, int j, int k) const
+DataArrayIdType *MEDCouplingStructuredMesh::Build1GTNodalConnectivityOfSubLevelMesh3D(const mcIdType *nodeStBg)
 {
-  int tmp[3]={i,j,k};
-  int tmp2[3];
-  int meshDim(getMeshDimension());
-  getSplitCellValues(tmp2);
-  std::transform(tmp,tmp+meshDim,tmp2,tmp,std::multiplies<int>());
-  return std::accumulate(tmp,tmp+meshDim,0);
+  std::vector<mcIdType> ngs(3);
+  mcIdType n0(nodeStBg[0]-1),n1(nodeStBg[1]-1),n2(nodeStBg[2]-1); ngs[0]=n0; ngs[1]=n1; ngs[2]=n2;
+  mcIdType off0(nodeStBg[0]),off1(nodeStBg[0]*nodeStBg[1]);
+  MCAuto<DataArrayIdType> conn(DataArrayIdType::New());
+  conn->alloc(4*GetNumberOfCellsOfSubLevelMesh(ngs,3));
+  mcIdType *cp(conn->getPointer());
+  //X
+  for(mcIdType i=0;i<nodeStBg[0];i++)
+    for(mcIdType j=0;j<n1;j++)
+      for(mcIdType k=0;k<n2;k++,cp+=4)
+        { cp[0]=k*off1+j*off0+i; cp[1]=(k+1)*off1+j*off0+i; cp[2]=(k+1)*off1+(j+1)*off0+i; cp[3]=k*off1+(j+1)*off0+i; }
+  //Y
+  for(mcIdType j=0;j<nodeStBg[1];j++)
+    for(mcIdType i=0;i<n0;i++)
+      for(mcIdType k=0;k<n2;k++,cp+=4)
+        { cp[0]=k*off1+j*off0+i; cp[1]=(k+1)*off1+j*off0+i; cp[2]=(k+1)*off1+j*off0+(i+1); cp[3]=k*off1+j*off0+(i+1); }
+  //Z
+  for(mcIdType k=0;k<nodeStBg[2];k++)
+    for(mcIdType i=0;i<n0;i++)
+      for(mcIdType j=0;j<n1;j++,cp+=4)
+        { cp[0]=k*off1+j*off0+i; cp[1]=k*off1+j*off0+(i+1); cp[2]=k*off1+(j+1)*off0+(i+1); cp[3]=k*off1+(j+1)*off0+i; }
+  return conn.retn();
 }
 
 /*!
- * Returns a node id by its (i,j,k) index.
- *  \param [in] i - a index of node coordinates array along X axis.
- *  \param [in] j - a index of node coordinates array along Y axis.
- *  \param [in] k - a index of node coordinates array along Z axis.
- *  \return int - a node id in \a this mesh.
+ * \sa MEDCouplingStructuredMesh::FindMinimalPartOf
  */
-int MEDCouplingStructuredMesh::getNodeIdFromPos(int i, int j, int k) const
+mcIdType MEDCouplingStructuredMesh::FindMinimalPartOf1D(const std::vector<mcIdType>& st, const std::vector<bool>& crit, std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat)
 {
-  int tmp[3]={i,j,k};
-  int tmp2[3];
-  int spaceDim(getSpaceDimension());
-  getSplitNodeValues(tmp2);
-  std::transform(tmp,tmp+spaceDim,tmp2,tmp,std::multiplies<int>());
-  return std::accumulate(tmp,tmp+spaceDim,0);
+  if(st.size()!=1)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::FindMinimalPartOf1D : the input size of st must be equal to 1 !");
+  mcIdType nxMin(std::numeric_limits<mcIdType>::max()),nxMax(-std::numeric_limits<mcIdType>::max());
+  mcIdType nx(st[0]),ret(0);
+  for(mcIdType i=0;i<nx;i++)
+    {
+      if(crit[i])
+        {
+          nxMin=std::min(nxMin,i); nxMax=std::max(nxMax,i);
+          ret++;
+        }
+    }
+  if(ret==0)
+    {
+      std::size_t sz(st.size());
+      partCompactFormat.resize(sz);
+      for(std::size_t i=0;i<sz;i++)
+        {
+          partCompactFormat[i].first=st[i]/2;
+          partCompactFormat[i].second=st[i]/2;
+        }
+      return ret;
+    }
+  partCompactFormat.resize(1);
+  partCompactFormat[0].first=nxMin; partCompactFormat[0].second=nxMax+1;
+  return ret;
 }
 
-void MEDCouplingStructuredMesh::GetPosFromId(int nodeId, int meshDim, const int *split, int *res)
+/*!
+ * \sa MEDCouplingStructuredMesh::FindMinimalPartOf
+ */
+mcIdType MEDCouplingStructuredMesh::FindMinimalPartOf2D(const std::vector<mcIdType>& st, const std::vector<bool>& crit, std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat)
 {
-  int work=nodeId;
-  for(int i=meshDim-1;i>=0;i--)
+  if(st.size()!=2)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::FindMinimalPartOf2D : the input size of st must be equal to 2 !");
+  mcIdType nxMin(std::numeric_limits<mcIdType>::max()),nxMax(-std::numeric_limits<mcIdType>::max()),nyMin(std::numeric_limits<mcIdType>::max()),nyMax(-std::numeric_limits<mcIdType>::max());
+  mcIdType it(0),nx(st[0]),ny(st[1]);
+  mcIdType ret(0);
+  for(mcIdType i=0;i<ny;i++)
+    for(mcIdType j=0;j<nx;j++,it++)
+      {
+        if(crit[it])
+          {
+            nxMin=std::min(nxMin,j); nxMax=std::max(nxMax,j);
+            nyMin=std::min(nyMin,i); nyMax=std::max(nyMax,i);
+            ret++;
+          }
+      }
+  if(ret==0)
     {
-      int pos=work/split[i];
-      work=work%split[i];
-      res[i]=pos;
+      std::size_t sz(st.size());
+      partCompactFormat.resize(sz);
+      for(std::size_t i=0;i<sz;i++)
+        {
+          partCompactFormat[i].first=st[i]/2;
+          partCompactFormat[i].second=st[i]/2;
+        }
+      return ret;
     }
+  partCompactFormat.resize(2);
+  partCompactFormat[0].first=nxMin; partCompactFormat[0].second=nxMax+1;
+  partCompactFormat[1].first=nyMin; partCompactFormat[1].second=nyMax+1;
+  return ret;
 }
 
-std::vector<int> MEDCouplingStructuredMesh::getCellGridStructure() const
+/*!
+ * \sa MEDCouplingStructuredMesh::FindMinimalPartOf
+ */
+mcIdType MEDCouplingStructuredMesh::FindMinimalPartOf3D(const std::vector<mcIdType>& st, const std::vector<bool>& crit, std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat)
 {
-  std::vector<int> ret(getNodeGridStructure());
-  std::transform(ret.begin(),ret.end(),ret.begin(),std::bind2nd(std::plus<int>(),-1));
+  if(st.size()!=3)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::FindMinimalPartOf3D : the input size of st must be equal to 3 !");
+  mcIdType nxMin(std::numeric_limits<mcIdType>::max()),nxMax(-std::numeric_limits<mcIdType>::max()),nyMin(std::numeric_limits<mcIdType>::max()),nyMax(-std::numeric_limits<mcIdType>::max()),nzMin(std::numeric_limits<mcIdType>::max()),nzMax(-std::numeric_limits<mcIdType>::max());
+  mcIdType it(0),nx(st[0]),ny(st[1]),nz(st[2]);
+  mcIdType ret(0);
+  for(mcIdType i=0;i<nz;i++)
+    for(mcIdType j=0;j<ny;j++)
+      for(mcIdType k=0;k<nx;k++,it++)
+        {
+          if(crit[it])
+            {
+              nxMin=std::min(nxMin,k); nxMax=std::max(nxMax,k);
+              nyMin=std::min(nyMin,j); nyMax=std::max(nyMax,j);
+              nzMin=std::min(nzMin,i); nzMax=std::max(nzMax,i);
+              ret++;
+            }
+        }
+  if(ret==0)
+    {
+      std::size_t sz(st.size());
+      partCompactFormat.resize(sz);
+      for(std::size_t i=0;i<sz;i++)
+        {
+          partCompactFormat[i].first=st[i]/2;
+          partCompactFormat[i].second=st[i]/2;
+        }
+      return ret;
+    }
+  partCompactFormat.resize(3);
+  partCompactFormat[0].first=nxMin; partCompactFormat[0].second=nxMax+1;
+  partCompactFormat[1].first=nyMin; partCompactFormat[1].second=nyMax+1;
+  partCompactFormat[2].first=nzMin; partCompactFormat[2].second=nzMax+1;
   return ret;
 }
 
 /*!
- * This method states if given part ids [ \a startIds, \a stopIds) and a structure \a st returns if it can be considered as a structured dataset.
- * If true is returned \a partCompactFormat will contain the information to build the corresponding part.
+ * This method computes given the nodal structure defined by [ \a nodeStBg , \a nodeStEnd ) the zipped form.
+ * std::distance( \a nodeStBg, \a nodeStEnd ) is equal to the space dimension. The returned value is equal to
+ * the meshDimension (or the zipped spaceDimension).
  *
- * \sa MEDCouplingStructuredMesh::BuildExplicitIdsFrom
+ * \param [out] zipNodeSt - The zipped node structure
+ * \return mcIdType - the
  */
-bool MEDCouplingStructuredMesh::IsPartStructured(const int *startIds, const int *stopIds, const std::vector<int>& st, std::vector< std::pair<int,int> >& partCompactFormat)
+int MEDCouplingStructuredMesh::ZipNodeStructure(const mcIdType *nodeStBg, const mcIdType *nodeStEnd, mcIdType zipNodeSt[3])
 {
-  int dim((int)st.size());
+  std::size_t spaceDim(std::distance(nodeStBg,nodeStEnd));
+  if(spaceDim>3 || spaceDim<1)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ZipNodeStructure : spaceDim must in [1,2,3] !");
+  zipNodeSt[0]=0; zipNodeSt[1]=0; zipNodeSt[2]=0;
+  int zippedI(0);
+  for(std::size_t i=0;i<spaceDim;i++)
+    {
+      mcIdType elt(nodeStBg[i]);
+      if(elt<1)
+        {
+          std::ostringstream oss; oss << "MEDCouplingStructuredMesh::ZipNodeStructure : the input nodal structure at pos#" << i << "(" << nodeStBg[i] << ") is invalid !";
+          throw INTERP_KERNEL::Exception(oss.str().c_str());
+        }
+      if(elt>=2)
+        zipNodeSt[zippedI++]=elt;
+    }
+  return zippedI;
+}
+
+DataArrayIdType *MEDCouplingStructuredMesh::Build1GTNodalConnectivityOfSubLevelMesh2D(const mcIdType *nodeStBg)
+{
+  std::vector<mcIdType> ngs(2);
+  mcIdType n0(nodeStBg[0]-1),n1(nodeStBg[1]-1); ngs[0]=n0; ngs[1]=n1;
+  mcIdType off0(nodeStBg[0]);
+  MCAuto<DataArrayIdType> conn(DataArrayIdType::New());
+  conn->alloc(2*GetNumberOfCellsOfSubLevelMesh(ngs,2));
+  mcIdType *cp(conn->getPointer());
+  //X
+  for(mcIdType i=0;i<nodeStBg[0];i++)
+    for(mcIdType j=0;j<n1;j++,cp+=2)
+      { cp[0]=j*off0+i; cp[1]=(j+1)*off0+i; }
+  //Y
+  for(mcIdType j=0;j<nodeStBg[1];j++)
+    for(mcIdType i=0;i<n0;i++,cp+=2)
+      { cp[0]=j*off0+i; cp[1]=j*off0+(i+1); }
+  return conn.retn();
+}
+
+/*!
+ * Returns a cell id by its (i,j,k) index. The cell is located between the i-th and
+ * ( i + 1 )-th nodes along X axis etc.
+ *  \param [in] i - a index of node coordinates array along X axis.
+ *  \param [in] j - a index of node coordinates array along Y axis.
+ *  \param [in] k - a index of node coordinates array along Z axis.
+ *  \return mcIdType - a cell id in \a this mesh.
+ */
+mcIdType MEDCouplingStructuredMesh::getCellIdFromPos(mcIdType i, mcIdType j, mcIdType k) const
+{
+  mcIdType tmp[3]={i,j,k};
+  mcIdType tmp2[3];
+  mcIdType meshDim(getMeshDimension());
+  getSplitCellValues(tmp2);
+  std::transform(tmp,tmp+meshDim,tmp2,tmp,std::multiplies<mcIdType>());
+  return std::accumulate(tmp,tmp+meshDim,0);
+}
+
+/*!
+ * Returns a node id by its (i,j,k) index.
+ *  \param [in] i - a index of node coordinates array along X axis.
+ *  \param [in] j - a index of node coordinates array along Y axis.
+ *  \param [in] k - a index of node coordinates array along Z axis.
+ *  \return mcIdType - a node id in \a this mesh.
+ */
+mcIdType MEDCouplingStructuredMesh::getNodeIdFromPos(mcIdType i, mcIdType j, mcIdType k) const
+{
+  mcIdType tmp[3]={i,j,k};
+  mcIdType tmp2[3];
+  mcIdType spaceDim(getSpaceDimension());
+  getSplitNodeValues(tmp2);
+  std::transform(tmp,tmp+spaceDim,tmp2,tmp,std::multiplies<mcIdType>());
+  return std::accumulate(tmp,tmp+spaceDim,0);
+}
+
+
+mcIdType MEDCouplingStructuredMesh::getNumberOfCells() const
+{
+  std::vector<mcIdType> ngs(getNodeGridStructure());
+  mcIdType ret(1);
+  bool isCatched(false);
+  std::size_t ii(0);
+  for(std::vector<mcIdType>::const_iterator it=ngs.begin();it!=ngs.end();it++,ii++)
+    {
+      mcIdType elt(*it);
+      if(elt<=0)
+        {
+          std::ostringstream oss; oss << "MEDCouplingStructuredMesh::getNumberOfCells : at pos #" << ii << " the number of nodes in nodeStructure is " << *it << " ! Must be > 0 !";
+          throw INTERP_KERNEL::Exception(oss.str().c_str());
+        }
+      if(elt>1)
+        {
+          ret*=elt-1;
+          isCatched=true;
+        }
+    }
+  return isCatched?ret:0;
+}
+
+mcIdType MEDCouplingStructuredMesh::getNumberOfNodes() const
+{
+  std::vector<mcIdType> ngs(getNodeGridStructure());
+  mcIdType ret(1);
+  for(std::vector<mcIdType>::const_iterator it=ngs.begin();it!=ngs.end();it++)
+    ret*=*it;
+  return ret;
+}
+
+/*!
+ * This method returns for a cell which id is \a cellId the location (locX,locY,locZ) of this cell in \a this.
+ *
+ * \param [in] cellId
+ * \return - A vector of size this->getMeshDimension()
+ * \throw if \a cellId not in [ 0, this->getNumberOfCells() )
+ */
+std::vector<mcIdType> MEDCouplingStructuredMesh::getLocationFromCellId(mcIdType cellId) const
+{
+  int meshDim(getMeshDimension());
+  std::vector<mcIdType> ret(meshDim);
+  std::vector<mcIdType> struc(getCellGridStructure());
+  mcIdType nbCells(std::accumulate(struc.begin(),struc.end(),1,std::multiplies<mcIdType>()));
+  if(cellId<0 || cellId>=nbCells)
+    {
+      std::ostringstream oss; oss << "MEDCouplingStructuredMesh::getLocationFromCellId : Input cell id (" << cellId << ") is invalid ! Should be in [0," << nbCells << ") !";
+      throw INTERP_KERNEL::Exception(oss.str().c_str());
+    }
+  std::vector<mcIdType> spt(GetSplitVectFromStruct(struc));
+  GetPosFromId(cellId,meshDim,&spt[0],&ret[0]);
+  return ret;
+}
+
+/*!
+ * This method returns for a node which id is \a nodeId the location (locX,locY,locZ) of this node in \a this.
+ *
+ * \param [in] nodeId
+ * \return - A vector of size this->getSpaceDimension()
+ * \throw if \a cellId not in [ 0, this->getNumberOfNodes() )
+ */
+std::vector<mcIdType> MEDCouplingStructuredMesh::getLocationFromNodeId(mcIdType nodeId) const
+{
+  int spaceDim(getSpaceDimension());
+  std::vector<mcIdType> ret(spaceDim);
+  std::vector<mcIdType> struc(getNodeGridStructure());
+  mcIdType nbNodes(std::accumulate(struc.begin(),struc.end(),1,std::multiplies<mcIdType>()));
+  if(nodeId<0 || nodeId>=nbNodes)
+    {
+      std::ostringstream oss; oss << "MEDCouplingStructuredMesh::getLocationFromNodeId : Input node id (" << nodeId << ") is invalid ! Should be in [0," << nbNodes << ") !";
+      throw INTERP_KERNEL::Exception(oss.str().c_str());
+    }
+  std::vector<mcIdType> spt(GetSplitVectFromStruct(struc));
+  GetPosFromId(nodeId,spaceDim,&spt[0],&ret[0]);
+  return ret;
+}
+
+void MEDCouplingStructuredMesh::GetPosFromId(mcIdType eltId, int meshDim, const mcIdType *split, mcIdType *res)
+{
+  mcIdType work(eltId);
+  for(int i=meshDim-1;i>=0;i--)
+    {
+      mcIdType pos=work/split[i];
+      work=work%split[i];
+      res[i]=pos;
+    }
+}
+
+std::vector<mcIdType> MEDCouplingStructuredMesh::getCellGridStructure() const
+{
+  std::vector<mcIdType> ret(getNodeGridStructure());
+  std::transform(ret.begin(),ret.end(),ret.begin(),std::bind2nd(std::plus<mcIdType>(),-1));
+  return ret;
+}
+
+/*!
+ * This method returns the squareness of \a this (quadrature). \a this is expected to be with a mesh dimension equal to 2 or 3.
+ */
+double MEDCouplingStructuredMesh::computeSquareness() const
+{
+  std::vector<mcIdType> cgs(getCellGridStructure());
+  if(cgs.empty())
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::computeSquareness : empty mesh !");
+  std::size_t dim(cgs.size());
+  if(dim==1)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::computeSquareness : A segment cannot be square !");
+  if(dim<4)
+    {
+      mcIdType minAx(cgs[0]),maxAx(cgs[0]);
+      for(std::size_t i=1;i<dim;i++)
+        {
+          minAx=std::min(minAx,cgs[i]);
+          maxAx=std::max(maxAx,cgs[i]);
+        }
+      return (double)minAx/(double)maxAx;
+    }
+  throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::computeSquareness : only dimension 2 and 3 supported !");
+}
+
+/*!
+ * Given a struct \a strct it returns a split vector [1,strct[0],strct[0]*strct[1]...]
+ * This decomposition allows to quickly find i,j,k given a global id.
+ */
+std::vector<mcIdType> MEDCouplingStructuredMesh::GetSplitVectFromStruct(const std::vector<mcIdType>& strct)
+{
+  std::size_t spaceDim(strct.size());
+  std::vector<mcIdType> res(spaceDim);
+  for(std::size_t l=0;l<spaceDim;l++)
+    {
+      mcIdType val=1;
+      for(std::size_t p=0;p<spaceDim-l-1;p++)
+        val*=strct[p];
+      res[spaceDim-l-1]=val;
+    }
+  return res;
+}
+
+/*!
+ * This method states if given part ids [ \a startIds, \a stopIds) and a structure \a st returns if it can be considered as a structured dataset.
+ * If true is returned \a partCompactFormat will contain the information to build the corresponding part.
+ *
+ * \sa MEDCouplingStructuredMesh::BuildExplicitIdsFrom, MEDCouplingStructuredMesh::DeduceNumberOfGivenRangeInCompactFrmt
+ */
+bool MEDCouplingStructuredMesh::IsPartStructured(const mcIdType *startIds, const mcIdType *stopIds, const std::vector<mcIdType>& st, std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat)
+{
+  int dim((int)st.size());
   partCompactFormat.resize(dim);
   if(dim<1 || dim>3)
     throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::isPartStructured : input structure must be of dimension in [1,2,3] !");
-  std::vector<int> tmp2(dim),tmp(dim),tmp3(dim),tmp4(dim); tmp2[0]=1;
+  std::vector<mcIdType> tmp2(dim),tmp(dim),tmp3(dim),tmp4(dim); tmp2[0]=1;
   for(int i=1;i<dim;i++)
     tmp2[i]=tmp2[i-1]*st[i-1];
   std::size_t sz(std::distance(startIds,stopIds));
@@ -700,7 +1408,7 @@ bool MEDCouplingStructuredMesh::IsPartStructured(const int *startIds, const int
       return true;
     }
   GetPosFromId(startIds[sz-1],dim,&tmp2[0],&tmp3[0]);
-  int szExp(1);
+  mcIdType szExp(1);
   for(int i=0;i<dim;i++)
     {
       if(tmp3[i]<0 || tmp3[i]>=st[i])
@@ -711,20 +1419,20 @@ bool MEDCouplingStructuredMesh::IsPartStructured(const int *startIds, const int
         return false;
       szExp*=tmp4[i];
     }
-  if(szExp!=(int)sz)
+  if(szExp!=ToIdType(sz))
     return false;
-  const int *w(startIds);
+  const mcIdType *w(startIds);
   switch(dim)
-    {
+  {
     case 3:
       {
-        for(int i=0;i<tmp4[2];i++)
+        for(mcIdType i=0;i<tmp4[2];i++)
           {
-            int a=tmp2[2]*(partCompactFormat[2].first+i);
-            for(int j=0;j<tmp4[1];j++)
+            mcIdType a=tmp2[2]*(partCompactFormat[2].first+i);
+            for(mcIdType j=0;j<tmp4[1];j++)
               {
-                int b=tmp2[1]*(partCompactFormat[1].first+j);
-                for(int k=0;k<tmp4[0];k++,w++)
+                mcIdType b=tmp2[1]*(partCompactFormat[1].first+j);
+                for(mcIdType k=0;k<tmp4[0];k++,w++)
                   {
                     if(partCompactFormat[0].first+k+b+a!=*w)
                       return false;
@@ -735,10 +1443,10 @@ bool MEDCouplingStructuredMesh::IsPartStructured(const int *startIds, const int
       }
     case 2:
       {
-        for(int j=0;j<tmp4[1];j++)
+        for(mcIdType j=0;j<tmp4[1];j++)
           {
-            int b=tmp2[1]*(partCompactFormat[1].first+j);
-            for(int k=0;k<tmp4[0];k++,w++)
+            mcIdType b=tmp2[1]*(partCompactFormat[1].first+j);
+            for(mcIdType k=0;k<tmp4[0];k++,w++)
               {
                 if(partCompactFormat[0].first+k+b!=*w)
                   return false;
@@ -748,7 +1456,7 @@ bool MEDCouplingStructuredMesh::IsPartStructured(const int *startIds, const int
       }
     case 1:
       {
-        for(int k=0;k<tmp4[0];k++,w++)
+        for(mcIdType k=0;k<tmp4[0];k++,w++)
           {
             if(partCompactFormat[0].first+k!=*w)
               return false;
@@ -757,47 +1465,465 @@ bool MEDCouplingStructuredMesh::IsPartStructured(const int *startIds, const int
       }
     default:
       throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::IsPartStructured : internal error !");
+  }
+}
+
+/*!
+ * This method takes in input a compact format [[Xmax,Xmin),[Ymin,Ymax)] and returns the corresponding dimensions for each axis that is to say
+ * [Xmax-Xmin,Ymax-Ymin].
+ *
+ * \throw if an axis range is so that max<min
+ * \sa GetCompactFrmtFromDimensions
+ */
+std::vector<mcIdType> MEDCouplingStructuredMesh::GetDimensionsFromCompactFrmt(const std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat)
+{
+  std::vector<mcIdType> ret(partCompactFormat.size());
+  for(std::size_t i=0;i<partCompactFormat.size();i++)
+    {
+      if(partCompactFormat[i].first>partCompactFormat[i].second)
+        {
+          std::ostringstream oss; oss << "MEDCouplingStructuredMesh::GetDimensionsFromCompactFrmt : For axis #" << i << " end is before start !";
+          throw INTERP_KERNEL::Exception(oss.str().c_str());
+        }
+      ret[i]=partCompactFormat[i].second-partCompactFormat[i].first;
+    }
+  return ret;
+}
+
+/*!
+ * This method takes in input a vector giving the number of entity per axis and returns for each axis a range starting from [0,0...]
+ *
+ * \throw if there is an axis in \a dims that is < 0.
+ * \sa GetDimensionsFromCompactFrmt, ChangeReferenceFromGlobalOfCompactFrmt, ChangeReferenceToGlobalOfCompactFrmt
+ */
+std::vector< std::pair<mcIdType,mcIdType> > MEDCouplingStructuredMesh::GetCompactFrmtFromDimensions(const std::vector<mcIdType>& dims)
+{
+  std::size_t sz(dims.size());
+  std::vector< std::pair<mcIdType,mcIdType> > ret(sz);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      if(dims[i]<0)
+        {
+          std::ostringstream oss; oss << "MEDCouplingStructuredMesh::GetDimensionsFromCompactFrmt : For axis #" << i << " dimension < 0 !";
+          throw INTERP_KERNEL::Exception(oss.str().c_str());
+        }
+      ret[i].first=0;
+      ret[i].second=dims[i];
+    }
+  return ret;
+}
+
+/*!
+ * This method returns the intersection zone of two ranges (in compact format) \a r1 and \a r2.
+ * This method will throw exception if on one axis the intersection is empty.
+ *
+ * \sa AreRangesIntersect
+ */
+std::vector< std::pair<mcIdType,mcIdType> > MEDCouplingStructuredMesh::IntersectRanges(const std::vector< std::pair<mcIdType,mcIdType> >& r1, const std::vector< std::pair<mcIdType,mcIdType> >& r2)
+{
+  std::size_t sz(r1.size());
+  if(sz!=r2.size())
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::IntersectRanges : the two ranges must have the same dimension !");
+  std::vector< std::pair<mcIdType,mcIdType> > ret(sz);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      if(r1[i].first>r1[i].second)
+        {
+          std::ostringstream oss; oss << "MEDCouplingStructuredMesh::IntersectRanges : On axis " << i << " of range r1, end is before start !";
+          throw INTERP_KERNEL::Exception(oss.str().c_str());
+        }
+      if(r2[i].first>r2[i].second)
+        {
+          std::ostringstream oss; oss << "MEDCouplingStructuredMesh::IntersectRanges : On axis " << i << " of range r2, end is before start !";
+          throw INTERP_KERNEL::Exception(oss.str().c_str());
+        }
+      ret[i].first=std::max(r1[i].first,r2[i].first);
+      ret[i].second=std::min(r1[i].second,r2[i].second);
+      if(ret[i].first>ret[i].second)
+        {
+          std::ostringstream oss; oss << "MEDCouplingStructuredMesh::IntersectRanges : On axis " << i << " the intersection of r1 and r2 is empty !";
+          throw INTERP_KERNEL::Exception(oss.str().c_str());
+        }
+    }
+  return ret;
+}
+
+/*!
+ * This method states if \a r1 and \a r2 do overlap of not. If yes you can call IntersectRanges to know the intersection area.
+ *
+ * \sa IntersectRanges
+ */
+bool MEDCouplingStructuredMesh::AreRangesIntersect(const std::vector< std::pair<mcIdType,mcIdType> >& r1, const std::vector< std::pair<mcIdType,mcIdType> >& r2)
+{
+  std::size_t sz(r1.size());
+  if(sz!=r2.size())
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::AreRangesIntersect : the two ranges must have the same dimension !");
+  for(std::size_t i=0;i<sz;i++)
+    {
+      if(r1[i].first>r1[i].second)
+        {
+          std::ostringstream oss; oss << "MEDCouplingStructuredMesh::AreRangesIntersect : On axis " << i << " of range r1, end is before start !";
+          throw INTERP_KERNEL::Exception(oss.str().c_str());
+        }
+      if(r2[i].first>r2[i].second)
+        {
+          std::ostringstream oss; oss << "MEDCouplingStructuredMesh::AreRangesIntersect : On axis " << i << " of range r2, end is before start !";
+          throw INTERP_KERNEL::Exception(oss.str().c_str());
+        }
+      if(r1[i].second<=r2[i].first)
+        return false;
+      if(r1[i].first>=r2[i].second)
+        return false;
+    }
+  return true;
+}
+
+/*!
+ * This method is close to BuildExplicitIdsFrom except that instead of returning a DataArrayIdType instance containing explicit ids it
+ * enable elems in the vector of booleans (for performance reasons). As it is method for performance, this method is \b not
+ * available in python.
+ *
+ * \param [in] st The entity structure.
+ * \param [in] partCompactFormat The compact subpart to be enabled.
+ * \param [in,out] vectToSwitchOn Vector which fetched items are enabled.
+ *
+ * \sa MEDCouplingStructuredMesh::BuildExplicitIdsFrom, ExtractFieldOfBoolFrom
+ */
+void MEDCouplingStructuredMesh::SwitchOnIdsFrom(const std::vector<mcIdType>& st, const std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat, std::vector<bool>& vectToSwitchOn)
+{
+  if(st.size()!=partCompactFormat.size())
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::SwitchOnIdsFrom : input arrays must have the same size !");
+  if(ToIdType(vectToSwitchOn.size())!=DeduceNumberOfGivenStructure(st))
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::SwitchOnIdsFrom : invalid size of input vector of boolean regarding the structure !");
+  std::vector<mcIdType> dims(GetDimensionsFromCompactFrmt(partCompactFormat));
+  switch(st.size())
+  {
+    case 3:
+      {
+        for(mcIdType i=0;i<dims[2];i++)
+          {
+            mcIdType a=(partCompactFormat[2].first+i)*st[0]*st[1];
+            for(mcIdType j=0;j<dims[1];j++)
+              {
+                mcIdType b=(partCompactFormat[1].first+j)*st[0];
+                for(mcIdType k=0;k<dims[0];k++)
+                  vectToSwitchOn[partCompactFormat[0].first+k+b+a]=true;
+              }
+          }
+        break;
+      }
+    case 2:
+      {
+        for(mcIdType j=0;j<dims[1];j++)
+          {
+            mcIdType b=(partCompactFormat[1].first+j)*st[0];
+            for(mcIdType k=0;k<dims[0];k++)
+              vectToSwitchOn[partCompactFormat[0].first+k+b]=true;
+          }
+        break;
+      }
+    case 1:
+      {
+        for(mcIdType k=0;k<dims[0];k++)
+          vectToSwitchOn[partCompactFormat[0].first+k]=true;
+        break;
+      }
+    default:
+      throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::SwitchOnIdsFrom : Dimension supported are 1,2 or 3 !");
+  }
+}
+
+/*!
+ * Obviously this method is \b NOT wrapped in python.
+ * This method is close to SwitchOnIdsFrom except that here, a sub field \a fieldOut is built starting from the input field \a fieldOfBool having the structure \a st.
+ * The extraction is defined by \a partCompactFormat.
+ *
+ * \param [in] st The entity structure.
+ * \param [in] fieldOfBool field of booleans having the size equal to \c MEDCouplingStructuredMesh::DeduceNumberOfGivenStructure(st).
+ * \param [in] partCompactFormat The compact subpart to be enabled.
+ * \param [out] fieldOut the result of the extraction.
+ *
+ * \sa MEDCouplingStructuredMesh::BuildExplicitIdsFrom, SwitchOnIdsFrom, ExtractFieldOfDoubleFrom
+ */
+void MEDCouplingStructuredMesh::ExtractFieldOfBoolFrom(const std::vector<mcIdType>& st, const std::vector<bool>& fieldOfBool, const std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat, std::vector<bool>& fieldOut)
+{
+  if(st.size()!=partCompactFormat.size())
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ExtractFieldOfBoolFrom : input arrays must have the same size !");
+  if(ToIdType(fieldOfBool.size())!=DeduceNumberOfGivenStructure(st))
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ExtractFieldOfBoolFrom : invalid size of input field of boolean regarding the structure !");
+  std::vector<mcIdType> dims(GetDimensionsFromCompactFrmt(partCompactFormat));
+  mcIdType nbOfTuplesOfOutField(DeduceNumberOfGivenStructure(dims));
+  fieldOut.resize(nbOfTuplesOfOutField);
+  mcIdType it(0);
+  switch(st.size())
+  {
+    case 3:
+      {
+        for(mcIdType i=0;i<dims[2];i++)
+          {
+            mcIdType a=(partCompactFormat[2].first+i)*st[0]*st[1];
+            for(mcIdType j=0;j<dims[1];j++)
+              {
+                mcIdType b=(partCompactFormat[1].first+j)*st[0];
+                for(mcIdType k=0;k<dims[0];k++)
+                  fieldOut[it++]=fieldOfBool[partCompactFormat[0].first+k+b+a];
+              }
+          }
+        break;
+      }
+    case 2:
+      {
+        for(mcIdType j=0;j<dims[1];j++)
+          {
+            mcIdType b=(partCompactFormat[1].first+j)*st[0];
+            for(mcIdType k=0;k<dims[0];k++)
+              fieldOut[it++]=fieldOfBool[partCompactFormat[0].first+k+b];
+          }
+        break;
+      }
+    case 1:
+      {
+        for(mcIdType k=0;k<dims[0];k++)
+          fieldOut[it++]=fieldOfBool[partCompactFormat[0].first+k];
+        break;
+      }
+    default:
+      throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ExtractFieldOfBoolFrom : Dimension supported are 1,2 or 3 !");
+  }
+}
+
+/*!
+ * This method is close to SwitchOnIdsFrom except that here, a sub field \a fieldOut is built starting from the input field \a fieldOfDbl having the structure \a st.
+ * The extraction is defined by \a partCompactFormat.
+ *
+ * \param [in] st The entity structure.
+ * \param [in] fieldOfDbl field of doubles having a number of tuples equal to \c MEDCouplingStructuredMesh::DeduceNumberOfGivenStructure(st).
+ * \param [in] partCompactFormat The compact subpart to be enabled.
+ * \return DataArrayDouble * -the result of the extraction.
+ *
+ * \sa MEDCouplingStructuredMesh::BuildExplicitIdsFrom, SwitchOnIdsFrom, ExtractFieldOfBoolFrom
+ */
+DataArrayDouble *MEDCouplingStructuredMesh::ExtractFieldOfDoubleFrom(const std::vector<mcIdType>& st, const DataArrayDouble *fieldOfDbl, const std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat)
+{
+  if(!fieldOfDbl || !fieldOfDbl->isAllocated())
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ExtractFieldOfDoubleFrom : input array of double is NULL or not allocated!");
+  if(st.size()!=partCompactFormat.size())
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ExtractFieldOfDoubleFrom : input arrays must have the same size !");
+  if(fieldOfDbl->getNumberOfTuples()!=DeduceNumberOfGivenStructure(st))
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ExtractFieldOfDoubleFrom : invalid size of input array of double regarding the structure !");
+  std::vector<mcIdType> dims(GetDimensionsFromCompactFrmt(partCompactFormat));
+  mcIdType nbOfTuplesOfOutField(DeduceNumberOfGivenStructure(dims));
+  std::size_t nbComp(fieldOfDbl->getNumberOfComponents());
+  MCAuto<DataArrayDouble> ret(DataArrayDouble::New()); ret->alloc(nbOfTuplesOfOutField,nbComp);
+  ret->copyStringInfoFrom(*fieldOfDbl);
+  double *ptRet(ret->getPointer());
+  const double *fieldOfDblPtr(fieldOfDbl->begin());
+  switch(st.size())
+  {
+    case 3:
+      {
+        for(mcIdType i=0;i<dims[2];i++)
+          {
+            mcIdType a=(partCompactFormat[2].first+i)*st[0]*st[1];
+            for(mcIdType j=0;j<dims[1];j++)
+              {
+                mcIdType b=(partCompactFormat[1].first+j)*st[0];
+                for(mcIdType k=0;k<dims[0];k++)
+                  ptRet=std::copy(fieldOfDblPtr+(partCompactFormat[0].first+k+b+a)*nbComp,fieldOfDblPtr+(partCompactFormat[0].first+k+b+a+1)*nbComp,ptRet);
+              }
+          }
+        break;
+      }
+    case 2:
+      {
+        for(mcIdType j=0;j<dims[1];j++)
+          {
+            mcIdType b=(partCompactFormat[1].first+j)*st[0];
+            for(mcIdType k=0;k<dims[0];k++)
+              ptRet=std::copy(fieldOfDblPtr+(partCompactFormat[0].first+k+b)*nbComp,fieldOfDblPtr+(partCompactFormat[0].first+k+b+1)*nbComp,ptRet);
+          }
+        break;
+      }
+    case 1:
+      {
+        for(mcIdType k=0;k<dims[0];k++)
+          ptRet=std::copy(fieldOfDblPtr+(partCompactFormat[0].first+k)*nbComp,fieldOfDblPtr+(partCompactFormat[0].first+k+1)*nbComp,ptRet);
+        break;
+      }
+    default:
+      throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ExtractFieldOfDoubleFrom : Dimension supported are 1,2 or 3 !");
+  }
+  return ret.retn();
+}
+
+/*!
+ * This method assign a part of values in \a fieldOfDbl using entirely values of \b other.
+ *
+ * \param [in] st - the structure of \a fieldOfDbl.
+ * \param [in,out] fieldOfDbl - the array that will be partially filled using \a other.
+ * \param [in] partCompactFormat - the specification of the part.
+ * \param [in] other - the array that will be used to fill \a fieldOfDbl.
+ */
+void MEDCouplingStructuredMesh::AssignPartOfFieldOfDoubleUsing(const std::vector<mcIdType>& st, DataArrayDouble *fieldOfDbl, const std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat, const DataArrayDouble *other)
+{//to be optimized
+  std::vector<mcIdType> facts(st.size(),1);
+  MEDCouplingIMesh::CondenseFineToCoarse(st,other,partCompactFormat,facts,fieldOfDbl);
+}
+
+/*!
+ * This method changes the reference of a part of structured mesh \a partOfBigInAbs define in absolute reference to a new reference \a bigInAbs.
+ * So this method only performs a translation by doing \a partOfBigRelativeToBig = \a partOfBigInAbs - \a bigInAbs
+ * This method also checks (if \a check=true) that \a partOfBigInAbs is included in \a bigInAbs.
+ * This method is useful to extract a part from a field lying on a big mesh.
+ *
+ * \sa ChangeReferenceToGlobalOfCompactFrmt, BuildExplicitIdsFrom, SwitchOnIdsFrom, ExtractFieldOfBoolFrom, ExtractFieldOfDoubleFrom
+ */
+void MEDCouplingStructuredMesh::ChangeReferenceFromGlobalOfCompactFrmt(const std::vector< std::pair<mcIdType,mcIdType> >& bigInAbs, const std::vector< std::pair<mcIdType,mcIdType> >& partOfBigInAbs, std::vector< std::pair<mcIdType,mcIdType> >& partOfBigRelativeToBig, bool check)
+{
+  std::size_t dim(bigInAbs.size());
+  if(dim!=partOfBigInAbs.size())
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ChangeReferenceFromGlobalOfCompactFrmt : The size of parts (dimension) must be the same !");
+  partOfBigRelativeToBig.resize(dim);
+  for(std::size_t i=0;i<dim;i++)
+    {
+      if(check)
+        {
+          if(bigInAbs[i].first>bigInAbs[i].second)
+            {
+              std::ostringstream oss; oss << "MEDCouplingStructuredMesh::ChangeReferenceFromGlobalOfCompactFrmt : Error at axis #" << i << " the input big part invalid, end before start !";
+              throw INTERP_KERNEL::Exception(oss.str().c_str());
+            }
+          if(partOfBigInAbs[i].first<bigInAbs[i].first || partOfBigInAbs[i].first>=bigInAbs[i].second)
+            {
+              std::ostringstream oss; oss << "MEDCouplingStructuredMesh::ChangeReferenceFromGlobalOfCompactFrmt : Error at axis #" << i << " the part is not included in the big one (start) !";
+              throw INTERP_KERNEL::Exception(oss.str().c_str());
+            }
+        }
+      partOfBigRelativeToBig[i].first=partOfBigInAbs[i].first-bigInAbs[i].first;
+      if(check)
+        {
+          if(partOfBigInAbs[i].second<partOfBigInAbs[i].first || partOfBigInAbs[i].second>bigInAbs[i].second)
+            {
+              std::ostringstream oss; oss << "MEDCouplingStructuredMesh::ChangeReferenceFromGlobalOfCompactFrmt : Error at axis #" << i << " the part is not included in the big one (end) !";
+              throw INTERP_KERNEL::Exception(oss.str().c_str());
+            }
+        }
+      partOfBigRelativeToBig[i].second=partOfBigInAbs[i].second-bigInAbs[i].first;
     }
 }
 
+/*
+ * This method is performs the opposite reference modification than explained in ChangeReferenceFromGlobalOfCompactFrmt.
+ *
+ * \sa ChangeReferenceFromGlobalOfCompactFrmt
+ */
+void MEDCouplingStructuredMesh::ChangeReferenceToGlobalOfCompactFrmt(const std::vector< std::pair<mcIdType,mcIdType> >& bigInAbs, const std::vector< std::pair<mcIdType,mcIdType> >& partOfBigRelativeToBig, std::vector< std::pair<mcIdType,mcIdType> >& partOfBigInAbs, bool check)
+{
+  std::size_t dim(bigInAbs.size());
+  if(dim!=partOfBigRelativeToBig.size())
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ChangeReferenceToGlobalOfCompactFrmt : The size of parts (dimension) must be the same !");
+  partOfBigInAbs.resize(dim);
+  for(std::size_t i=0;i<dim;i++)
+    {
+      if(check)
+        {
+          if(bigInAbs[i].first>bigInAbs[i].second)
+            {
+              std::ostringstream oss; oss << "MEDCouplingStructuredMesh::ChangeReferenceToGlobalOfCompactFrmt : Error at axis #" << i << " the input big part invalid, end before start !";
+              throw INTERP_KERNEL::Exception(oss.str().c_str());
+            }
+          if(partOfBigRelativeToBig[i].first<0 || partOfBigRelativeToBig[i].first>=bigInAbs[i].second-bigInAbs[i].first)
+            {
+              std::ostringstream oss; oss << "MEDCouplingStructuredMesh::ChangeReferenceToGlobalOfCompactFrmt : Error at axis #" << i << " the start of part is not in the big one !";
+              throw INTERP_KERNEL::Exception(oss.str().c_str());
+            }
+        }
+      partOfBigInAbs[i].first=partOfBigRelativeToBig[i].first+bigInAbs[i].first;
+      if(check)
+        {
+          if(partOfBigRelativeToBig[i].second<partOfBigRelativeToBig[i].first || partOfBigRelativeToBig[i].second>bigInAbs[i].second-bigInAbs[i].first)
+            {
+              std::ostringstream oss; oss << "MEDCouplingStructuredMesh::ChangeReferenceToGlobalOfCompactFrmt : Error at axis #" << i << " the end of part is not in the big one !";
+              throw INTERP_KERNEL::Exception(oss.str().c_str());
+            }
+        }
+      partOfBigInAbs[i].second=partOfBigRelativeToBig[i].second+bigInAbs[i].first;
+    }
+}
+
+/*!
+ * This method performs a translation (defined by \a translation) of \a part and returns the result of translated part.
+ *
+ * \sa FindTranslationFrom
+ */
+std::vector< std::pair<mcIdType,mcIdType> > MEDCouplingStructuredMesh::TranslateCompactFrmt(const std::vector< std::pair<mcIdType,mcIdType> >& part, const std::vector<mcIdType>& translation)
+{
+  std::size_t sz(part.size());
+  if(translation.size()!=sz)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::TranslateCompactFrmt : the sizes are not equal !");
+  std::vector< std::pair<mcIdType,mcIdType> > ret(sz);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      ret[i].first=part[i].first+translation[i];
+      ret[i].second=part[i].second+translation[i];
+    }
+  return ret;
+}
+
+/*!
+ * \sa TranslateCompactFrmt
+ */
+std::vector<mcIdType> MEDCouplingStructuredMesh::FindTranslationFrom(const std::vector< std::pair<mcIdType,mcIdType> >& startingFrom, const std::vector< std::pair<mcIdType,mcIdType> >& goingTo)
+{
+  std::size_t sz(startingFrom.size());
+  if(goingTo.size()!=sz)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::FindTranslationFrom : the sizes are not equal !");
+  std::vector< mcIdType > ret(sz);
+  for(std::size_t i=0;i<sz;i++)
+    {
+      ret[i]=goingTo[i].first-startingFrom[i].first;
+    }
+  return ret;
+}
+
 /*!
  * This method builds the explicit entity array from the structure in \a st and the range in \a partCompactFormat.
- *If the range contains invalid values regarding sructure an exception will be thrown.
+ * If the range contains invalid values regarding structure an exception will be thrown.
  *
- * \return DataArrayInt * - a new object.
- * \sa MEDCouplingStructuredMesh::IsPartStructured
+ * \return DataArrayIdType * - a new object.
+ * \sa MEDCouplingStructuredMesh::IsPartStructured, MEDCouplingStructuredMesh::DeduceNumberOfGivenRangeInCompactFrmt, SwitchOnIdsFrom, ExtractFieldOfBoolFrom, ExtractFieldOfDoubleFrom, MultiplyPartOf
  */
-DataArrayInt *MEDCouplingStructuredMesh::BuildExplicitIdsFrom(const std::vector<int>& st, const std::vector< std::pair<int,int> >& partCompactFormat)
+DataArrayIdType *MEDCouplingStructuredMesh::BuildExplicitIdsFrom(const std::vector<mcIdType>& st, const std::vector< std::pair<mcIdType,mcIdType> >& partCompactFormat)
 {
   if(st.size()!=partCompactFormat.size())
     throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::BuildExplicitIdsFrom : input arrays must have the same size !");
-  int nbOfItems(1);
-  std::vector<int> dims(st.size());
+  mcIdType nbOfItems(1);
+  std::vector<mcIdType> dims(st.size());
   for(std::size_t i=0;i<st.size();i++)
     {
       if(partCompactFormat[i].first<0 || partCompactFormat[i].first>st[i])
         throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::BuildExplicitIdsFrom : invalid input range 1 !");
       if(partCompactFormat[i].second<0 || partCompactFormat[i].second>st[i])
         throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::BuildExplicitIdsFrom : invalid input range 2 !");
-      if(partCompactFormat[i].second<=partCompactFormat[i].first)
+      if(partCompactFormat[i].second<partCompactFormat[i].first)
         throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::BuildExplicitIdsFrom : invalid input range 3 !");
       dims[i]=partCompactFormat[i].second-partCompactFormat[i].first;
       nbOfItems*=dims[i];
     }
-  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> ret(DataArrayInt::New());
+  MCAuto<DataArrayIdType> ret(DataArrayIdType::New());
   ret->alloc(nbOfItems,1);
-  int *pt(ret->getPointer());
+  mcIdType *pt(ret->getPointer());
   switch(st.size())
-    {
+  {
     case 3:
       {
-        for(int i=0;i<dims[2];i++)
+        for(mcIdType i=0;i<dims[2];i++)
           {
-            int a=(partCompactFormat[2].first+i)*st[0]*st[1];
-            for(int j=0;j<dims[1];j++)
+            mcIdType a=(partCompactFormat[2].first+i)*st[0]*st[1];
+            for(mcIdType j=0;j<dims[1];j++)
               {
-                int b=(partCompactFormat[1].first+j)*st[0];
-                for(int k=0;k<dims[0];k++,pt++)
+                mcIdType b=(partCompactFormat[1].first+j)*st[0];
+                for(mcIdType k=0;k<dims[0];k++,pt++)
                   *pt=partCompactFormat[0].first+k+b+a;
               }
           }
@@ -805,22 +1931,181 @@ DataArrayInt *MEDCouplingStructuredMesh::BuildExplicitIdsFrom(const std::vector<
       }
     case 2:
       {
-        for(int j=0;j<dims[1];j++)
+        for(mcIdType j=0;j<dims[1];j++)
           {
-            int b=(partCompactFormat[1].first+j)*st[0];
-            for(int k=0;k<dims[0];k++,pt++)
+            mcIdType b=(partCompactFormat[1].first+j)*st[0];
+            for(mcIdType k=0;k<dims[0];k++,pt++)
               *pt=partCompactFormat[0].first+k+b;
           }
         break;
       }
     case 1:
       {
-        for(int k=0;k<dims[0];k++,pt++)
+        for(mcIdType k=0;k<dims[0];k++,pt++)
           *pt=partCompactFormat[0].first+k;
         break;
       }
     default:
       throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::BuildExplicitIdsFrom : Dimension supported are 1,2 or 3 !");
-    }
+  }
   return ret.retn();
 }
+
+/*!
+ * This method multiplies by \a factor values in tuples located by \a part in \a da.
+ *
+ * \param [in] st - the structure of grid ( \b without considering ghost cells).
+ * \param [in] part - the part in the structure ( \b without considering ghost cells) contained in grid whose structure is defined by \a st.
+ * \param [in] factor - the factor, the tuples in \a da will be multiply by.
+ * \param [in,out] da - The DataArray in which only tuples specified by \a part will be modified.
+ *
+ * \sa BuildExplicitIdsFrom
+ */
+void MEDCouplingStructuredMesh::MultiplyPartOf(const std::vector<mcIdType>& st, const std::vector< std::pair<mcIdType,mcIdType> >& part, double factor, DataArrayDouble *da)
+{
+  if(!da || !da->isAllocated())
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::MultiplyPartOf : DataArrayDouble instance must be not NULL and allocated !");
+  if(st.size()!=part.size())
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::MultiplyPartOf : input arrays must have the same size !");
+  std::vector<mcIdType> dims(st.size());
+  for(std::size_t i=0;i<st.size();i++)
+    {
+      if(part[i].first<0 || part[i].first>st[i])
+        throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::MultiplyPartOf : invalid input range 1 !");
+      if(part[i].second<0 || part[i].second>st[i])
+        throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::MultiplyPartOf : invalid input range 2 !");
+      if(part[i].second<part[i].first)
+        throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::MultiplyPartOf : invalid input range 3 !");
+      dims[i]=part[i].second-part[i].first;
+    }
+  mcIdType nbOfTuplesExp(MEDCouplingStructuredMesh::DeduceNumberOfGivenStructure(st));
+  std::size_t nbCompo(da->getNumberOfComponents());
+  if(da->getNumberOfTuples()!=nbOfTuplesExp)
+    {
+      std::ostringstream oss; oss << "MEDCouplingStructuredMesh::MultiplyPartOf : invalid nb of tuples ! Expected " << nbOfTuplesExp << " having " << da->getNumberOfTuples() << " !";
+      throw INTERP_KERNEL::Exception(oss.str().c_str());
+    }
+  double *pt(da->getPointer());
+  switch(st.size())
+  {
+    case 3:
+      {
+        for(mcIdType i=0;i<dims[2];i++)
+          {
+            mcIdType a=(part[2].first+i)*st[0]*st[1];
+            for(mcIdType j=0;j<dims[1];j++)
+              {
+                mcIdType b=(part[1].first+j)*st[0];
+                for(mcIdType k=0;k<dims[0];k++)
+                  {
+                    mcIdType offset(part[0].first+k+b+a);
+                    std::transform(pt+nbCompo*offset,pt+nbCompo*(offset+1),pt+nbCompo*offset,std::bind2nd(std::multiplies<double>(),factor));
+                  }
+              }
+          }
+        break;
+      }
+    case 2:
+      {
+        for(mcIdType j=0;j<dims[1];j++)
+          {
+            mcIdType b=(part[1].first+j)*st[0];
+            for(mcIdType k=0;k<dims[0];k++)
+              {
+                mcIdType offset(part[0].first+k+b);
+                std::transform(pt+nbCompo*offset,pt+nbCompo*(offset+1),pt+nbCompo*offset,std::bind2nd(std::multiplies<double>(),factor));
+              }
+          }
+        break;
+      }
+    case 1:
+      {
+        for(mcIdType k=0;k<dims[0];k++)
+          {
+            mcIdType offset(part[0].first+k);
+            std::transform(pt+nbCompo*offset,pt+nbCompo*(offset+1),pt+nbCompo*offset,std::bind2nd(std::multiplies<double>(),factor));
+          }
+        break;
+      }
+    default:
+      throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::MultiplyPartOf : Dimension supported are 1,2 or 3 !");
+  }
+}
+
+/*!
+ * This method multiplies by \a factor values in tuples located by \a part in \a da.
+ *
+ * \param [in] st - the structure of grid ( \b without considering ghost cells).
+ * \param [in] part - the part in the structure ( \b without considering ghost cells) contained in grid whose structure is defined by \a st.
+ * \param [in] ghostSize - \a ghostSize must be >= 0.
+ * \param [in] factor - the factor, the tuples in \a da will be multiply by.
+ * \param [in,out] da - The DataArray in which only tuples specified by \a part will be modified.
+ *
+ * \sa MultiplyPartOf, PutInGhostFormat
+ */
+void MEDCouplingStructuredMesh::MultiplyPartOfByGhost(const std::vector<mcIdType>& st, const std::vector< std::pair<mcIdType,mcIdType> >& part, mcIdType ghostSize, double factor, DataArrayDouble *da)
+{
+  std::vector<mcIdType> stWG;
+  std::vector< std::pair<mcIdType,mcIdType> > partWG;
+  PutInGhostFormat(ghostSize,st,part,stWG,partWG);
+  MultiplyPartOf(stWG,partWG,factor,da);
+}
+
+/*!
+ * This method multiplies by \a factor values in tuples located by \a part in \a da.
+ *
+ * \param [in] st - the structure of grid ( \b without considering ghost cells).
+ * \param [in] part - the part in the structure ( \b without considering ghost cells) contained in grid whose structure is defined by \a st.
+ * \param [in] ghostSize - \a ghostSize must be >= 0.
+ * \param [out] stWithGhost - the structure considering ghost cells.
+ * \param [out] partWithGhost - the part considering the ghost cells.
+ *
+ * \sa MultiplyPartOf, PutInGhostFormat
+ */
+void MEDCouplingStructuredMesh::PutInGhostFormat(mcIdType ghostSize, const std::vector<mcIdType>& st, const std::vector< std::pair<mcIdType,mcIdType> >& part, std::vector<mcIdType>& stWithGhost, std::vector< std::pair<mcIdType,mcIdType> >&partWithGhost)
+{
+  if(ghostSize<0)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::PutInGhostFormat : ghost size must be >= 0 !");
+  std::size_t dim(part.size());
+  if(st.size()!=dim)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::PutInGhostFormat : the dimension of input vectors must be the same !");
+  for(std::size_t i=0;i<dim;i++)
+    if(part[i].first<0 || part[i].first>part[i].second || part[i].second>st[i])
+      throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::PutInGhostFormat : the specified part is invalid ! The begin must be >= 0 and <= end ! The end must be <= to the size at considered dimension !");
+  stWithGhost.resize(st.size());
+  std::transform(st.begin(),st.end(),stWithGhost.begin(),std::bind2nd(std::plus<mcIdType>(),2*ghostSize));
+  partWithGhost=part;
+  ApplyGhostOnCompactFrmt(partWithGhost,ghostSize);
+}
+
+/*!
+ * \param [in,out] partBeforeFact - the part of a image mesh in compact format that will be put in ghost reference.
+ * \param [in] ghostSize - the ghost size of zone for all axis.
+ */
+void MEDCouplingStructuredMesh::ApplyGhostOnCompactFrmt(std::vector< std::pair<mcIdType,mcIdType> >& partBeforeFact, mcIdType ghostSize)
+{
+  if(ghostSize<0)
+    throw INTERP_KERNEL::Exception("MEDCouplingStructuredMesh::ApplyGhostOnCompactFrmt : ghost size must be >= 0 !");
+  std::size_t sz(partBeforeFact.size());
+  for(std::size_t i=0;i<sz;i++)
+    {
+      partBeforeFact[i].first+=ghostSize;
+      partBeforeFact[i].second+=ghostSize;
+    }
+}
+
+mcIdType MEDCouplingStructuredMesh::GetNumberOfCellsOfSubLevelMesh(const std::vector<mcIdType>& cgs, int mdim)
+{
+  mcIdType ret(0);
+  for(int i=0;i<mdim;i++)
+    {
+      mcIdType locRet(1);
+      for(int j=0;j<mdim;j++)
+        if(j!=i)
+          locRet*=cgs[j];
+        else
+          locRet*=cgs[j]+1;
+      ret+=locRet;
+    }
+  return ret;
+}