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[modules/med.git] / src / MEDLoader / MEDFileFieldOverView.cxx
index 7d43b18a7cb3a2748b95dcece291c2d81f2eaf40..4f099caa1bf495822f8f1d01cabbfcf9eb211ea7 100644 (file)
@@ -26,6 +26,9 @@
 
 using namespace ParaMEDMEM;
 
+const unsigned char MEDMeshMultiLev::PARAMEDMEM_2_VTKTYPE[MEDMeshMultiLev::PARAMEDMEM_2_VTKTYPE_LGTH]=
+  {1,3,21,5,9,7,22,34,23,28,-1,-1,-1,-1,10,14,13,-1,12,-1,24,-1,16,27,-1,26,-1,29,-1,-1,25,42,-1,4};
+
 const char MEDFileField1TSStructItem2::NEWLY_CREATED_PFL_NAME[]="???";
 
 MEDFileMeshStruct *MEDFileMeshStruct::New(const MEDFileMesh *mesh)
@@ -137,6 +140,22 @@ void MEDFileField1TSStructItem2::checkWithMeshStructForGaussPT(const MEDFileMesh
   checkInRange(nbOfEnt,loc.getNumberOfGaussPoints(),globs);
 }
 
+int MEDFileField1TSStructItem2::getNbOfIntegrationPts(const MEDFileFieldGlobsReal *globs) const
+{
+  if(_loc.empty())
+    {
+      if(getPflName().empty())
+        return (_start_end.second-_start_end.first)/_nb_of_entity;
+      else
+        return (_start_end.second-_start_end.first)/getPfl(globs)->getNumberOfTuples();
+    }
+  else
+    {
+      const MEDFileFieldLoc& loc(globs->getLocalization(_loc.c_str()));
+      return loc.getNumberOfGaussPoints();
+    }
+}
+
 std::string MEDFileField1TSStructItem2::getPflName() const
 {
   return _pfl->getName();
@@ -179,6 +198,18 @@ void MEDFileField1TSStructItem2::checkInRange(int nbOfEntity, int nip, const MED
     }
 }
 
+bool MEDFileField1TSStructItem2::isFastlyEqual(int& startExp, INTERP_KERNEL::NormalizedCellType gt, const char *pflName) const
+{
+  if(startExp!=_start_end.first)
+    return false;
+  if(gt!=_geo_type)
+    return false;
+  if(getPflName()!=pflName)
+    return false;
+  startExp=_start_end.second;
+  return true;
+}
+
 bool MEDFileField1TSStructItem2::operator==(const MEDFileField1TSStructItem2& other) const throw(INTERP_KERNEL::Exception)
 {
   //_nb_of_entity is not taken into account here. It is not a bug, because no mesh consideration needed here to perform fast compare.
@@ -867,6 +898,154 @@ void MEDMeshMultiLev::setNodeReduction(const DataArrayInt *nr)
   _node_reduction=const_cast<DataArrayInt*>(nr);
 }
 
+bool MEDMeshMultiLev::isFastlyTheSameStruct(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs) const throw(INTERP_KERNEL::Exception)
+{
+  if(fst.getType()==ON_NODES)
+    {
+      if(fst.getNumberOfItems()!=1)
+        throw INTERP_KERNEL::Exception("MEDMeshMultiLev::isFastlyTheSameStruct : unexpected situation for nodes !");
+      const MEDFileField1TSStructItem2& p(fst[0]);
+      std::string pflName(p.getPflName());
+      const DataArrayInt *nr(_node_reduction);
+      if(pflName.empty() && !nr)
+        return true;
+      if(pflName==nr->getName())
+        return true;
+      return false;
+    }
+  else
+    {
+      std::size_t sz(fst.getNumberOfItems());
+      if(sz!=_geo_types.size())
+        return false;
+      int strt(0);
+      for(std::size_t i=0;i<sz;i++)
+        {
+          const MEDFileField1TSStructItem2& p(fst[i]);
+          if(!p.isFastlyEqual(strt,_geo_types[i],getPflNameOfId(i).c_str()))
+            return false;
+        }
+      return true;
+    }
+}
+
+DataArray *MEDMeshMultiLev::buildDataArray(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs, const DataArray *vals) const throw(INTERP_KERNEL::Exception)
+{
+  MEDCouplingAutoRefCountObjectPtr<DataArray> ret(const_cast<DataArray *>(vals)); ret->incrRef();
+  if(isFastlyTheSameStruct(fst,globs))
+    return ret.retn();
+  else
+    return constructDataArray(fst,globs,vals);
+}
+
+std::string MEDMeshMultiLev::getPflNameOfId(int id) const
+{
+  std::size_t sz(_pfls.size());
+  if(id<0 || id>=sz)
+    throw INTERP_KERNEL::Exception("MEDMeshMultiLev::getPflNameOfId : invalid input id !");
+  const DataArrayInt *pfl(_pfls[id]);
+  if(!pfl)
+    return std::string("");
+  return pfl->getName();
+}
+
+DataArray *MEDMeshMultiLev::constructDataArray(const MEDFileField1TSStructItem& fst, const MEDFileFieldGlobsReal *globs, const DataArray *vals) const throw(INTERP_KERNEL::Exception)
+{
+  if(fst.getType()==ON_NODES)
+    {
+      if(fst.getNumberOfItems()!=1)
+        throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for nodes !");
+      const MEDFileField1TSStructItem2& p(fst[0]);
+      std::string pflName(p.getPflName());
+      const DataArrayInt *nr(_node_reduction);
+      if(pflName.empty() && !nr)
+        return vals->deepCpy();
+      if(pflName.empty() && nr)
+         throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for nodes 2 !");
+      if(!pflName.empty() && nr)
+        {
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(globs->getProfile(pflName.c_str())->deepCpy());
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p2(nr->deepCpy());
+          p1->sort(true); p2->sort(true);
+          if(!p1->isEqualWithoutConsideringStr(*p2))
+            throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for nodes 3 !");
+          p1=DataArrayInt::FindPermutationFromFirstToSecond(globs->getProfile(pflName.c_str()),nr);
+          MEDCouplingAutoRefCountObjectPtr<DataArray> ret(vals->deepCpy());
+          ret->renumberInPlace(p1->begin());
+          return ret.retn();
+        }
+      if(!pflName.empty() && !nr)
+        {
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(globs->getProfile(pflName.c_str())->deepCpy());
+          p1->sort(true);
+          if(!p1->isIdentity() || p1->getNumberOfTuples()!=p.getNbEntity())
+            throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for nodes 4 !");
+          MEDCouplingAutoRefCountObjectPtr<DataArray> ret(vals->deepCpy());
+          ret->renumberInPlace(globs->getProfile(pflName.c_str())->begin());
+          return ret.retn();
+        }
+      throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for nodes 5 !");
+    }
+  else
+    {
+      std::size_t sz(fst.getNumberOfItems());
+      std::vector< MEDCouplingAutoRefCountObjectPtr<DataArray> > arrSafe(sz);
+      std::vector< const DataArray *> arr(sz);
+      for(std::size_t i=0;i<sz;i++)
+        {
+          const MEDFileField1TSStructItem2& p(fst[i]);
+          const std::pair<int,int>& strtStop(p.getStartStop());
+          std::vector< INTERP_KERNEL::NormalizedCellType >::const_iterator it(std::find(_geo_types.begin(),_geo_types.end(),p.getGeo()));
+          if(it==_geo_types.end())
+            throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 1 !");
+          if(std::find(it+1,_geo_types.end(),p.getGeo())!=_geo_types.end())
+            throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 2 !");
+          std::size_t pos(std::distance(_geo_types.begin(),it));
+          const DataArrayInt *thisP(_pfls[pos]),*otherP(p.getPfl(globs));
+          MEDCouplingAutoRefCountObjectPtr<DataArray> ret(vals->selectByTupleId2(strtStop.first,strtStop.second,1));
+          if(!thisP && !otherP)
+            {
+              arrSafe[i]=ret; arr[i]=ret;
+              continue;
+            }
+          int nbi(p.getNbOfIntegrationPts(globs)),nc(ret->getNumberOfComponents());
+          if(!thisP && otherP)
+            {
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(otherP->deepCpy());
+              p1->sort(true);
+              if(!p1->isIdentity() || p1->getNumberOfTuples()!=p.getNbEntity())
+                throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 3 !");
+              ret->rearrange(nbi*nc); ret->renumberInPlace(otherP->begin()); ret->rearrange(nc);
+              arrSafe[i]=ret; arr[i]=ret;
+              continue;
+            }
+          if(thisP && otherP)
+            {
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(otherP->deepCpy());
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p2(thisP->deepCpy());
+              p1->sort(true); p2->sort(true);
+              if(!p1->isEqualWithoutConsideringStr(*p2))
+                throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 4 !");
+              p1=DataArrayInt::FindPermutationFromFirstToSecond(otherP,thisP);
+              ret->rearrange(nbi*nc); ret->renumberInPlace(p1->begin()); ret->rearrange(nc);
+              continue;
+            }
+          if(thisP && !otherP)
+            {
+              MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p1(thisP->deepCpy());
+              p1->sort(true);
+              if(!p1->isIdentity() || p1->getNumberOfTuples()!=p.getNbEntity())
+                throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 3 !");
+              ret->rearrange(nbi*nc); ret->renumberInPlaceR(otherP->begin()); ret->rearrange(nc);
+              arrSafe[i]=ret; arr[i]=ret;
+              continue;
+            }
+          throw INTERP_KERNEL::Exception("MEDMeshMultiLev::constructDataArray : unexpected situation for cells 6 !");
+        }
+      return DataArray::Aggregate(arr);
+    }
+}
+
 MEDMeshMultiLev::MEDMeshMultiLev()
 {
 }
@@ -885,6 +1064,12 @@ MEDMeshMultiLev::MEDMeshMultiLev(const std::vector<INTERP_KERNEL::NormalizedCell
     }
 }
 
+MEDMeshMultiLev::MEDMeshMultiLev(const MEDMeshMultiLev& other):_pfls(other._pfls),_geo_types(other._geo_types),_nb_entities(other._nb_entities),_node_reduction(other._node_reduction)
+{
+}
+
+//=
+
 MEDUMeshMultiLev *MEDUMeshMultiLev::New(const MEDFileUMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
 {
   return new MEDUMeshMultiLev(m,levs);
@@ -938,18 +1123,266 @@ void MEDUMeshMultiLev::selectPartOfNodes(const DataArrayInt *pflNodes) throw(INT
 {
    if(!pflNodes || !pflNodes->isAllocated())
      return ;
-   /*std::vector<int> ngs(getNodeGridStructure());
+   std::size_t sz(_parts.size());
+   std::vector< MEDCouplingAutoRefCountObjectPtr<DataArrayInt> > a(sz);
+   std::vector< const DataArrayInt *> aa(sz);
+   for(std::size_t i=0;i<sz;i++)
+     {
+       
+       const DataArrayInt *pfl(_pfls[i]);
+       MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> m(_parts[i]);
+       if(pfl)
+         m=dynamic_cast<MEDCoupling1GTUMesh *>(_parts[i]->buildPartOfMySelfKeepCoords(pfl->begin(),pfl->end()));
+       DataArrayInt *cellIds=0;
+       m->fillCellIdsToKeepFromNodeIds(pflNodes->begin(),pflNodes->end(),true,cellIds);
+       MEDCouplingAutoRefCountObjectPtr<DataArrayInt> cellIdsSafe(cellIds);
+       MEDCouplingAutoRefCountObjectPtr<MEDCouplingPointSet> m2(m->buildPartOfMySelfKeepCoords(cellIds->begin(),cellIds->end()));
+       int tmp=-1;
+       a[i]=m2->getNodeIdsInUse(tmp); aa[i]=a[i];
+       if(pfl)
+         _pfls[i]=pfl->selectByTupleIdSafe(cellIds->begin(),cellIds->end());
+       else
+         _pfls[i]=cellIdsSafe;
+     }
+   _node_reduction=DataArrayInt::Aggregate(aa);
+   _node_reduction->sort(true);
+   _node_reduction=_node_reduction->buildUnique();
+}
+
+MEDMeshMultiLev *MEDUMeshMultiLev::prepare() const throw(INTERP_KERNEL::Exception)
+{
+  return new MEDUMeshMultiLev(*this);
+}
+
+MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDUMeshMultiLev& other):MEDMeshMultiLev(other),_parts(other._parts)
+{
+}
+
+MEDUMeshMultiLev::MEDUMeshMultiLev(const MEDStructuredMeshMultiLev& other, const MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh>& part):MEDMeshMultiLev(other)
+{
+  _parts.resize(1);
+  _parts[0]=part;
+}
+
+void MEDUMeshMultiLev::buildVTUArrays(DataArrayDouble *& coords, DataArrayByte *&types, DataArrayInt *&cellLocations, DataArrayInt *& cells, DataArrayInt *&faceLocations, DataArrayInt *&faces) const throw(INTERP_KERNEL::Exception)
+{
+  if(_parts.empty())
+    throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : empty array !");
+  if(!(const MEDCoupling1GTUMesh *)_parts[0])
+    throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : first part is null !");
+  const DataArrayDouble *tmp(_parts[0]->getCoords());
+  if(!tmp)
+    throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : the coordinates are null !");
+  MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> a(const_cast<DataArrayDouble *>(tmp)); tmp->incrRef();
+  int szBCE(0),szD(0),szF(0);
+  bool isPolyh(false);
+  for(std::vector< MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> >::const_iterator it=_parts.begin();it!=_parts.end();it++)
+    {
+      const MEDCoupling1GTUMesh *cur(*it);
+      if(!cur)
+        throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : a part is null !");
+      int curNbCells(cur->getNumberOfCells());
+      szBCE+=curNbCells;
+      if((*it)->getCellModelEnum()!=INTERP_KERNEL::NORM_POLYHED)
+        szD=(*it)->getNodalConnectivity()->getNumberOfTuples()+curNbCells;
+      else
+        {
+          isPolyh=true;
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> tmp((*it)->computeEffectiveNbOfNodesPerCell());
+          szD+=tmp->accumulate(0)+curNbCells;
+          szF+=2*curNbCells+(*it)->getNodalConnectivity()->getNumberOfTuples();
+        }
+    }
+  MEDCouplingAutoRefCountObjectPtr<DataArrayByte> b(DataArrayByte::New()); b->alloc(szBCE,1); char *bPtr(b->getPointer());
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> c(DataArrayInt::New()); c->alloc(szBCE,1); int *cPtr(c->getPointer());
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> d(DataArrayInt::New()); d->alloc(szD,1); int *dPtr(d->getPointer());
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> e(DataArrayInt::New()),f(DataArrayInt::New()); int *ePtr(0),*fPtr(0);
+  if(isPolyh)
+    { e->alloc(szBCE,1); ePtr=e->getPointer(); f->alloc(szF,1); fPtr=f->getPointer(); }
+  int k(0);
+  for(std::vector< MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> >::const_iterator it=_parts.begin();it!=_parts.end();it++)
+    {
+      const MEDCoupling1GTUMesh *cur(*it);
+      int curNbCells(cur->getNumberOfCells());
+      int gt((int)cur->getCellModelEnum());
+      if(gt<0 || gt>=PARAMEDMEM_2_VTKTYPE_LGTH)
+        throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : invalid geometric type !");
+      unsigned char gtvtk(PARAMEDMEM_2_VTKTYPE[gt]);
+      if(gtvtk==-1)
+        throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : no VTK type for the requested INTERP_KERNEL geometric type !");
+      std::fill(bPtr,bPtr+curNbCells,gtvtk); bPtr+=curNbCells;
+      const MEDCoupling1SGTUMesh *scur(dynamic_cast<const MEDCoupling1SGTUMesh *>(cur));
+      const MEDCoupling1DGTUMesh *dcur(dynamic_cast<const MEDCoupling1DGTUMesh *>(cur));
+      const int *connPtr(cur->getNodalConnectivity()->begin());
+      if(!scur && !dcur)
+        throw INTERP_KERNEL::Exception("MEDUMeshMultiLev::getVTUArrays : internal error !");
+      if(scur)
+        {
+          int nnpc(scur->getNumberOfNodesPerCell());
+          for(int i=0;i<curNbCells;i++,connPtr+=nnpc)
+            {
+              *dPtr++=nnpc;
+              dPtr=std::copy(connPtr,connPtr+nnpc,dPtr);
+              *cPtr=k+nnpc; k=*cPtr++;
+            }
+          if(isPolyh)
+            { std::fill(ePtr,ePtr+curNbCells,-1); ePtr+=curNbCells; }
+        }
+      else
+        {
+          const int *connIPtr(dcur->getNodalConnectivityIndex()->begin());
+          if(cur->getCellModelEnum()!=INTERP_KERNEL::NORM_POLYHED)
+            {
+              for(int i=0;i<curNbCells;i++,connIPtr++)
+                {
+                  *dPtr++=connIPtr[1]-connIPtr[0];
+                  dPtr=std::copy(connPtr+connIPtr[0],connPtr+connIPtr[1],dPtr);
+                  *cPtr=k+connIPtr[1]-connIPtr[0]; k=*cPtr++;
+                }
+            }
+          else
+            {
+              for(int i=0;i<curNbCells;i++,connIPtr++)
+                {
+                  std::set<int> s(connPtr+connIPtr[0],connPtr+connIPtr[1]);
+                  *dPtr++=(int)s.size();
+                  dPtr=std::copy(s.begin(),s.end(),dPtr);
+                  *cPtr=k+(int)s.size(); k=*cPtr++;
+                }
+            }
+          if(isPolyh)
+            {
+              connIPtr=dcur->getNodalConnectivityIndex()->begin();
+              if(cur->getCellModelEnum()!=INTERP_KERNEL::NORM_POLYHED)
+                { std::fill(ePtr,ePtr+curNbCells,-1); ePtr+=curNbCells; }
+              else
+                {
+                  int kk(0);
+                  for(int i=0;i<curNbCells;i++,connIPtr++)
+                    {
+                      int nbFace(std::count(connPtr+connIPtr[0],connPtr+connIPtr[1],-1)+1);
+                      *fPtr++=nbFace;
+                      const int *work(connPtr+connIPtr[0]);
+                      for(int j=0;j<nbFace;j++)
+                        {
+                          const int *work2=std::find(work,connPtr+connIPtr[1],-1);
+                          *fPtr++=std::distance(work,work2);
+                          fPtr=std::copy(work,work2,fPtr);
+                          work=work2+1;
+                        }
+                      *ePtr=kk; kk+=connIPtr[1]-connIPtr[0]+2;
+                    }
+                }
+            }
+        }
+    }
+  if(!isPolyh)
+    reorderNodesIfNecessary(a,d,0);
+  else
+    reorderNodesIfNecessary(a,d,f);
+  coords=a.retn(); types=b.retn(); cellLocations=c.retn(); cells=d.retn();
+  if(!isPolyh)
+    { faceLocations=0; faces=0; }
+  else
+    { faceLocations=e.retn(); faces=f.retn(); }
+}
+
+void MEDUMeshMultiLev::reorderNodesIfNecessary(DataArrayDouble *coords, DataArrayInt *nodalConnVTK, DataArrayInt *polyhedNodalConnVTK) const throw(INTERP_KERNEL::Exception)
+{
+  const DataArrayInt *nr(_node_reduction);
+  if(!nr)
+    return ;
+  int sz(coords->getNumberOfTuples());
+  std::vector<bool> b(sz,false);
+  const int *work(nodalConnVTK->begin()),*endW(nodalConnVTK->end());
+  while(work!=endW)
+    {
+      int nb(*work++);
+      for(int i=0;i<nb && work!=endW;i++,work++)
+        {
+          if(*work>=0 && *work<sz)
+            b[sz]=true;
+          else
+            throw INTERP_KERNEL::Exception("MEDStructuredMeshMultiLev::reorderNodesIfNecessary : internal error !");
+        }
+    }
+  if(polyhedNodalConnVTK)
+    {
+      work=polyhedNodalConnVTK->begin(); endW=polyhedNodalConnVTK->end();
+      while(work!=endW)
+        {
+          int nb(*work++);
+          for(int i=0;i<nb && work!=endW;i++)
+            {
+              int nb2(*work++);
+              for(int j=0;j<nb2 && work!=endW;j++,work++)
+                {
+                  if(*work>=0 && *work<sz)
+                    b[sz]=true;
+                  else
+                    throw INTERP_KERNEL::Exception("MEDStructuredMeshMultiLev::reorderNodesIfNecessary : internal error #2 !");
+                }
+            }
+        }
+    }
+  int szExp(std::count(b.begin(),b.end(),true));
+  if(szExp!=nr->getNumberOfTuples())
+    throw INTERP_KERNEL::Exception("MEDStructuredMeshMultiLev::reorderNodesIfNecessary : internal error #3 !");
+  // Go renumbering !
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> o2n(DataArrayInt::New()); o2n->alloc(sz,1);
+  int *o2nPtr(o2n->getPointer());
+  int newId(0);
+  for(int i=0;i<sz;i++,o2nPtr++)
+    if(b[i]) *o2nPtr=newId++; else *o2nPtr=-1;
+  //tony you have to finish
+  /*MEDCouplingAutoRefCountObjectPtr<DataArrayInt> n2o(o2n->invertO2N2N2O(nr->getNumberOfTuples()));
+  
+  const int *o2nc(o2n->begin());
+  int *work2(nodalConnVTK->getPointer()),*endW2(nodalConnVTK->getPointer());
+  MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> coo(coords->selectByTupleIdSafe(nr->begin(),nr->end()));*/
+}
+
+//=
+
+MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev()
+{
+}
+
+MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDMeshMultiLev(gts,pfls,nbEntities)
+{
+}
+
+void MEDStructuredMeshMultiLev::selectPartOfNodes(const DataArrayInt *pflNodes) throw(INTERP_KERNEL::Exception)
+{
+  if(!pflNodes || !pflNodes->isAllocated())
+    return ;
+  std::vector<int> ngs(getNodeGridStructure());
   MEDCouplingAutoRefCountObjectPtr<DataArrayInt> conn(MEDCouplingStructuredMesh::Build1GTNodalConnectivity(&ngs[0],&ngs[0]+ngs.size()));
-  MEDCouplingAutoRefCountObjectPtr<MEDCoupling1SGTUMesh> m(MEDCoupling1SGTUMesh::New("",GMEDCouplingStructuredMesh::etGeoTypeGivenMeshDimension(ngs.size())));
+  MEDCouplingAutoRefCountObjectPtr<MEDCoupling1SGTUMesh> m(MEDCoupling1SGTUMesh::New("",MEDCouplingStructuredMesh::GetGeoTypeGivenMeshDimension(ngs.size())));
   m->setNodalConnectivity(conn);
+  const DataArrayInt *pfl(_pfls[0]);
+  if(pfl)
+    {
+      m=dynamic_cast<MEDCoupling1SGTUMesh *>(m->buildPartOfMySelfKeepCoords(pfl->begin(),pfl->end()));
+    }
   DataArrayInt *cellIds=0;
   m->fillCellIdsToKeepFromNodeIds(pflNodes->begin(),pflNodes->end(),true,cellIds);
   MEDCouplingAutoRefCountObjectPtr<DataArrayInt> cellIdsSafe(cellIds);
   MEDCouplingAutoRefCountObjectPtr<MEDCouplingPointSet> m2(m->buildPartOfMySelfKeepCoords(cellIds->begin(),cellIds->end()));
   int tmp=-1;
-  _node_reduction=m2->getNodeIdsInUse(tmp);*/
+  _node_reduction=m2->getNodeIdsInUse(tmp);
+  if(pfl)
+    _pfls[0]=pfl->selectByTupleIdSafe(cellIds->begin(),cellIds->end());
+  else
+    _pfls[0]=cellIdsSafe;
+}
+
+MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const MEDStructuredMeshMultiLev& other):MEDMeshMultiLev(other)
+{
 }
 
+//=
+
 MEDCMeshMultiLev *MEDCMeshMultiLev::New(const MEDFileCMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
 {
   return new MEDCMeshMultiLev(m,levs);
@@ -996,6 +1429,10 @@ MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDFileCMesh *m, const std::vector<INTE
     }
 }
 
+MEDCMeshMultiLev::MEDCMeshMultiLev(const MEDCMeshMultiLev& other):MEDStructuredMeshMultiLev(other)
+{
+}
+
 std::vector<int> MEDCMeshMultiLev::getNodeGridStructure() const throw(INTERP_KERNEL::Exception)
 {
   std::vector<int> ret(_coords.size());
@@ -1004,6 +1441,51 @@ std::vector<int> MEDCMeshMultiLev::getNodeGridStructure() const throw(INTERP_KER
   return ret;
 }
 
+MEDMeshMultiLev *MEDCMeshMultiLev::prepare() const throw(INTERP_KERNEL::Exception)
+{
+  const DataArrayInt *pfl(_pfls[0]),*nr(_node_reduction);
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> nnr;
+  std::vector<int> cgs,ngs(getNodeGridStructure());
+  cgs.resize(ngs.size());
+  std::transform(ngs.begin(),ngs.end(),cgs.begin(),std::bind2nd(std::plus<int>(),-1));
+  if(pfl)
+    {
+      std::vector< std::pair<int,int> > cellParts;
+      if(MEDCouplingStructuredMesh::IsPartStructured(pfl->begin(),pfl->end(),cgs,cellParts))
+        {
+          MEDCouplingAutoRefCountObjectPtr<MEDCMeshMultiLev> ret(new MEDCMeshMultiLev(*this));
+          if(nr)
+            { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+          ret->_nb_entities[0]=pfl->getNumberOfTuples();
+          ret->_pfls[0]=0;
+          std::vector< MEDCouplingAutoRefCountObjectPtr<DataArrayDouble> > coords(_coords.size());
+          for(std::size_t i=0;i<_coords.size();i++)
+            coords[i]=_coords[i]->selectByTupleId2(cellParts[i].first,cellParts[i].second+1,1);
+          ret->_coords=coords;
+          return ret.retn();
+        }
+      else
+        {
+          MEDCouplingAutoRefCountObjectPtr<MEDCouplingCMesh> m(MEDCouplingCMesh::New());
+          for(std::size_t i=0;i<ngs.size();i++)
+            m->setCoordsAt(i,_coords[i]);
+          MEDCouplingAutoRefCountObjectPtr<MEDCoupling1SGTUMesh> m2(m->build1SGTUnstructured());
+          MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> m3=dynamic_cast<MEDCoupling1GTUMesh *>(m2->buildPartOfMySelfKeepCoords(pfl->begin(),pfl->end()));
+          MEDCouplingAutoRefCountObjectPtr<MEDUMeshMultiLev> ret(new MEDUMeshMultiLev(*this,m3));
+          if(nr)
+            { m3->zipCoords(); nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+          return ret.retn();
+        }
+    }
+  else
+    {
+      MEDCouplingAutoRefCountObjectPtr<MEDCMeshMultiLev> ret(new MEDCMeshMultiLev(*this));
+      if(nr)
+        { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+      return ret.retn();
+    }
+}
+
 //=
 
 MEDCurveLinearMeshMultiLev *MEDCurveLinearMeshMultiLev::New(const MEDFileCurveLinearMesh *m, const std::vector<int>& levs) throw(INTERP_KERNEL::Exception)
@@ -1047,33 +1529,61 @@ MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDFileCurveLinearM
   _structure=m->getMesh()->getNodeGridStructure();
 }
 
-std::vector<int> MEDCurveLinearMeshMultiLev::getNodeGridStructure() const throw(INTERP_KERNEL::Exception)
-{
-  return _structure;
-}
-
-//=
-
-MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev()
+MEDCurveLinearMeshMultiLev::MEDCurveLinearMeshMultiLev(const MEDCurveLinearMeshMultiLev& other):MEDStructuredMeshMultiLev(other),_coords(other._coords),_structure(other._structure)
 {
 }
 
-MEDStructuredMeshMultiLev::MEDStructuredMeshMultiLev(const std::vector<INTERP_KERNEL::NormalizedCellType>& gts, const std::vector<const DataArrayInt *>& pfls, const std::vector<int>& nbEntities):MEDMeshMultiLev(gts,pfls,nbEntities)
+std::vector<int> MEDCurveLinearMeshMultiLev::getNodeGridStructure() const throw(INTERP_KERNEL::Exception)
 {
+  return _structure;
 }
 
-void MEDStructuredMeshMultiLev::selectPartOfNodes(const DataArrayInt *pflNodes) throw(INTERP_KERNEL::Exception)
+MEDMeshMultiLev *MEDCurveLinearMeshMultiLev::prepare() const throw(INTERP_KERNEL::Exception)
 {
-  if(!pflNodes || !pflNodes->isAllocated())
-    return ;
-  std::vector<int> ngs(getNodeGridStructure());
-  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> conn(MEDCouplingStructuredMesh::Build1GTNodalConnectivity(&ngs[0],&ngs[0]+ngs.size()));
-  MEDCouplingAutoRefCountObjectPtr<MEDCoupling1SGTUMesh> m(MEDCoupling1SGTUMesh::New("",MEDCouplingStructuredMesh::GetGeoTypeGivenMeshDimension(ngs.size())));
-  m->setNodalConnectivity(conn);
-  DataArrayInt *cellIds=0;
-  m->fillCellIdsToKeepFromNodeIds(pflNodes->begin(),pflNodes->end(),true,cellIds);
-  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> cellIdsSafe(cellIds);
-  MEDCouplingAutoRefCountObjectPtr<MEDCouplingPointSet> m2(m->buildPartOfMySelfKeepCoords(cellIds->begin(),cellIds->end()));
-  int tmp=-1;
-  _node_reduction=m2->getNodeIdsInUse(tmp);
+  const DataArrayInt *pfl(_pfls[0]),*nr(_node_reduction);
+  MEDCouplingAutoRefCountObjectPtr<DataArrayInt> nnr;
+  std::vector<int> cgs,ngs(getNodeGridStructure());
+  cgs.resize(ngs.size());
+  std::transform(ngs.begin(),ngs.end(),cgs.begin(),std::bind2nd(std::plus<int>(),-1));
+  if(pfl)
+    {
+      std::vector< std::pair<int,int> > cellParts,nodeParts;
+      if(MEDCouplingStructuredMesh::IsPartStructured(pfl->begin(),pfl->end(),cgs,cellParts))
+        {
+          nodeParts=cellParts;
+          std::vector<int> st(ngs.size());
+          for(std::size_t i=0;i<ngs.size();i++)
+            {
+              nodeParts[i].second++;
+              st[i]=nodeParts[i].second-nodeParts[i].first;
+            }
+          MEDCouplingAutoRefCountObjectPtr<DataArrayInt> p(MEDCouplingStructuredMesh::BuildExplicitIdsFrom(ngs,nodeParts));
+          MEDCouplingAutoRefCountObjectPtr<MEDCurveLinearMeshMultiLev> ret(new MEDCurveLinearMeshMultiLev(*this));
+          if(nr)
+            { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+          ret->_nb_entities[0]=pfl->getNumberOfTuples();
+          ret->_pfls[0]=0;
+          ret->_coords=_coords->selectByTupleIdSafe(p->begin(),p->end());
+          ret->_structure=st;
+          return ret.retn();
+        }
+      else
+        {
+          MEDCouplingAutoRefCountObjectPtr<MEDCouplingCurveLinearMesh> m(MEDCouplingCurveLinearMesh::New());
+          m->setCoords(_coords); m->setNodeGridStructure(&_structure[0],&_structure[0]+_structure.size());
+          MEDCouplingAutoRefCountObjectPtr<MEDCoupling1SGTUMesh> m2(m->build1SGTUnstructured());
+          MEDCouplingAutoRefCountObjectPtr<MEDCoupling1GTUMesh> m3=dynamic_cast<MEDCoupling1GTUMesh *>(m2->buildPartOfMySelfKeepCoords(pfl->begin(),pfl->end()));
+          MEDCouplingAutoRefCountObjectPtr<MEDUMeshMultiLev> ret(new MEDUMeshMultiLev(*this,m3));
+          if(nr)
+            { m3->zipCoords(); nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+          return ret.retn();
+        }
+    }
+  else
+    {
+      MEDCouplingAutoRefCountObjectPtr<MEDCurveLinearMeshMultiLev> ret(new MEDCurveLinearMeshMultiLev(*this));
+      if(nr)
+        { nnr=nr->deepCpy(); nnr->sort(true); ret->setNodeReduction(nnr); }
+      return ret.retn();
+    }
 }