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Intersec bug fix: when intersecting nodes are merged, they were not properly
[tools/medcoupling.git] / src / ParaMEDMEMTest / ParaMEDMEMTest_OverlapDEC.cxx
index 63bfc9f9be256db379f92d31d348609848ad66df..5969e2be045dd6abf0e4323310cbcc06d827cb73 100644 (file)
@@ -1,4 +1,4 @@
-// Copyright (C) 2007-2015  CEA/DEN, EDF R&D
+// Copyright (C) 2007-2016  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
 
 using namespace std;
 
-#include "MEDCouplingAutoRefCountObjectPtr.hxx"
+#include "MCAuto.hxx"
 #include "MEDLoader.hxx"
 #include "MEDLoaderBase.hxx"
 #include "MEDCouplingFieldDouble.hxx"
 #include "MEDCouplingMemArray.hxx"
 #include "MEDCouplingRemapper.hxx"
 
-using namespace ParaMEDMEM;
+using namespace MEDCoupling;
 
-typedef  MEDCouplingAutoRefCountObjectPtr<MEDCouplingUMesh> MUMesh;
-typedef  MEDCouplingAutoRefCountObjectPtr<MEDCouplingFieldDouble> MFDouble;
+typedef  MCAuto<MEDCouplingUMesh> MUMesh;
+typedef  MCAuto<MEDCouplingFieldDouble> MFDouble;
+typedef  MCAuto<DataArrayDouble> DADouble;
 
 //void ParaMEDMEMTest::testOverlapDEC_LMEC_seq()
 //{
@@ -58,16 +59,16 @@ typedef  MEDCouplingAutoRefCountObjectPtr<MEDCouplingFieldDouble> MFDouble;
 //  string tgt_mesh_nam(rep + string("T_SC_Trio_dst.med"));
 ////  string src_mesh_nam(rep + string("h_TH_Trio_src.med"));
 ////  string tgt_mesh_nam(rep + string("h_TH_Trio_dst.med"));
-//  MUMesh src_mesh=MEDLoader::ReadUMeshFromFile(src_mesh_nam,"SupportOf_",0);
-//  MUMesh tgt_mesh=MEDLoader::ReadUMeshFromFile(tgt_mesh_nam,"SupportOf_T_SC_Trio",0);
-////  MUMesh tgt_mesh=MEDLoader::ReadUMeshFromFile(tgt_mesh_nam,"SupportOf_h_TH_Trio",0);
+//  MUMesh src_mesh=ReadUMeshFromFile(src_mesh_nam,"SupportOf_",0);
+//  MUMesh tgt_mesh=ReadUMeshFromFile(tgt_mesh_nam,"SupportOf_T_SC_Trio",0);
+////  MUMesh tgt_mesh=ReadUMeshFromFile(tgt_mesh_nam,"SupportOf_h_TH_Trio",0);
 //
 //  MFDouble srcField = MEDCouplingFieldDouble::New(ON_CELLS, ONE_TIME);
 //  srcField->setMesh(src_mesh);
 //  DataArrayDouble * dad = DataArrayDouble::New(); dad->alloc(src_mesh->getNumberOfCells(),1);
 //  dad->fillWithValue(1.0);
 //  srcField->setArray(dad);
-//  srcField->setNature(ConservativeVolumic);
+//  srcField->setNature(IntensiveMaximum);
 //
 //  MEDCouplingRemapper remap;
 //  remap.setOrientation(2); // always consider surface intersections as absolute areas.
@@ -75,7 +76,7 @@ typedef  MEDCouplingAutoRefCountObjectPtr<MEDCouplingFieldDouble> MFDouble;
 //  MFDouble tgtField = remap.transferField(srcField, 1.0e+300);
 //  tgtField->setName("result");
 //  string out_nam(rep + string("adrien.med"));
-//  MEDLoader::WriteField(out_nam,tgtField, true);
+//  WriteField(out_nam,tgtField, true);
 //  cout << "wrote: " << out_nam << "\n";
 //  double integ1 = 0.0, integ2 = 0.0;
 //  srcField->integral(true, &integ1);
@@ -88,7 +89,7 @@ typedef  MEDCouplingAutoRefCountObjectPtr<MEDCouplingFieldDouble> MFDouble;
 //
 //void ParaMEDMEMTest::testOverlapDEC_LMEC_para()
 //{
-//  using namespace ParaMEDMEM;
+//  using namespace MEDCoupling;
 //
 //  int size;
 //  int rank;
@@ -127,9 +128,9 @@ typedef  MEDCouplingAutoRefCountObjectPtr<MEDCouplingFieldDouble> MFDouble;
 //    {
 //    //  string src_mesh_nam(rep + string("h_TH_Trio_src.med"));
 //    //  string tgt_mesh_nam(rep + string("h_TH_Trio_dst.med"));
-//      MUMesh src_mesh=MEDLoader::ReadUMeshFromFile(src_mesh_nam,"SupportOf_",0);
-//      MUMesh tgt_mesh=MEDLoader::ReadUMeshFromFile(tgt_mesh_nam,"SupportOf_T_SC_Trio",0);
-//    //  MUMesh tgt_mesh=MEDLoader::ReadUMeshFromFile(tgt_mesh_nam,"SupportOf_h_TH_Trio",0);
+//      MUMesh src_mesh=ReadUMeshFromFile(src_mesh_nam,"SupportOf_",0);
+//      MUMesh tgt_mesh=ReadUMeshFromFile(tgt_mesh_nam,"SupportOf_T_SC_Trio",0);
+//    //  MUMesh tgt_mesh=ReadUMeshFromFile(tgt_mesh_nam,"SupportOf_h_TH_Trio",0);
 //
 //      // **** SOURCE
 //      srcField = MEDCouplingFieldDouble::New(ON_CELLS, ONE_TIME);
@@ -137,18 +138,18 @@ typedef  MEDCouplingAutoRefCountObjectPtr<MEDCouplingFieldDouble> MFDouble;
 //      DataArrayDouble * dad = DataArrayDouble::New(); dad->alloc(src_mesh->getNumberOfCells(),1);
 //      dad->fillWithValue(1.0);
 //      srcField->setArray(dad);
-//      srcField->setNature(ConservativeVolumic);
+//      srcField->setNature(IntensiveMaximum);
 //
 //      ComponentTopology comptopo;
 //      parameshS = new ParaMESH(src_mesh,*dec.getGroup(),"source mesh");
 //      parafieldS = new ParaFIELD(ON_CELLS,ONE_TIME,parameshS,comptopo);
-//      parafieldS->getField()->setNature(ConservativeVolumic);//IntegralGlobConstraint
+//      parafieldS->getField()->setNature(IntensiveMaximum);//ExtensiveConservation
 //      parafieldS->getField()->setArray(dad);
 //
 //      // **** TARGET
 //      parameshT=new ParaMESH(tgt_mesh,*dec.getGroup(),"target mesh");
 //      parafieldT=new ParaFIELD(ON_CELLS,ONE_TIME,parameshT,comptopo);
-//      parafieldT->getField()->setNature(ConservativeVolumic);//IntegralGlobConstraint
+//      parafieldT->getField()->setNature(IntensiveMaximum);//ExtensiveConservation
 //      parafieldT->getField()->getArray()->fillWithValue(1.0e300);
 ////      valsT[0]=7.;
 //    }
@@ -169,7 +170,7 @@ typedef  MEDCouplingAutoRefCountObjectPtr<MEDCouplingFieldDouble> MFDouble;
 //      tgtField->integral(true, &integ2);
 //      tgtField->setName("result");
 //      string out_nam(rep + string("adrien_para.med"));
-//      MEDLoader::WriteField(out_nam,tgtField, true);
+//      WriteField(out_nam,tgtField, true);
 //      cout << "wrote: " << out_nam << "\n";
 //      CPPUNIT_ASSERT_DOUBLES_EQUAL(integ1,integ2,1e-8);
 //    }
@@ -180,17 +181,15 @@ typedef  MEDCouplingAutoRefCountObjectPtr<MEDCouplingFieldDouble> MFDouble;
 //
 //  MPI_Barrier(MPI_COMM_WORLD);
 //}
-
-void prepareData1(int rank, ProcessorGroup * grp, NatureOfField nature,
-                                  MEDCouplingUMesh *& meshS, MEDCouplingUMesh *& meshT,
-                                  ParaMESH*& parameshS, ParaMESH*& parameshT,
-                                  ParaFIELD*& parafieldS, ParaFIELD*& parafieldT)
+//
+void prepareData1(int rank, NatureOfField nature,
+                  MEDCouplingFieldDouble *& fieldS, MEDCouplingFieldDouble *& fieldT)
 {
   if(rank==0)
     {
       const double coordsS[10]={0.,0.,0.5,0.,1.,0.,0.,0.5,0.5,0.5};
       const double coordsT[6]={0.,0.,1.,0.,1.,1.};
-      meshS=MEDCouplingUMesh::New();
+      MUMesh meshS=MEDCouplingUMesh::New();
       meshS->setMeshDimension(2);
       DataArrayDouble *myCoords=DataArrayDouble::New();
       myCoords->alloc(5,2);
@@ -202,14 +201,14 @@ void prepareData1(int rank, ProcessorGroup * grp, NatureOfField nature,
       meshS->insertNextCell(INTERP_KERNEL::NORM_QUAD4,4,connS);
       meshS->insertNextCell(INTERP_KERNEL::NORM_TRI3,3,connS+4);
       meshS->finishInsertingCells();
-      ComponentTopology comptopo;
-      parameshS=new ParaMESH(meshS, *grp,"source mesh");
-      parafieldS=new ParaFIELD(ON_CELLS,NO_TIME,parameshS,comptopo);
-      parafieldS->getField()->setNature(nature);
-      double *valsS=parafieldS->getField()->getArray()->getPointer();
+      fieldS = MEDCouplingFieldDouble::New(ON_CELLS,NO_TIME);
+      DADouble arr = DataArrayDouble::New(); arr->alloc(meshS->getNumberOfCells(), 1);
+      fieldS->setMesh(meshS); fieldS->setArray(arr);
+      fieldS->setNature(nature);
+      double *valsS=fieldS->getArray()->getPointer();
       valsS[0]=7.; valsS[1]=8.;
       //
-      meshT=MEDCouplingUMesh::New();
+      MUMesh meshT=MEDCouplingUMesh::New();
       meshT->setMeshDimension(2);
       myCoords=DataArrayDouble::New();
       myCoords->alloc(3,2);
@@ -220,10 +219,11 @@ void prepareData1(int rank, ProcessorGroup * grp, NatureOfField nature,
       meshT->allocateCells(1);
       meshT->insertNextCell(INTERP_KERNEL::NORM_TRI3,3,connT);
       meshT->finishInsertingCells();
-      parameshT=new ParaMESH(meshT,*grp,"target mesh");
-      parafieldT=new ParaFIELD(ON_CELLS,NO_TIME,parameshT,comptopo);
-      parafieldT->getField()->setNature(nature);
-      double *valsT=parafieldT->getField()->getArray()->getPointer();
+      fieldT = MEDCouplingFieldDouble::New(ON_CELLS,NO_TIME);
+      DADouble arr2 = DataArrayDouble::New(); arr2->alloc(meshT->getNumberOfCells(), 1);
+      fieldT->setMesh(meshT);  fieldT->setArray(arr2);
+      fieldT->setNature(nature);
+      double *valsT=fieldT->getArray()->getPointer();
       valsT[0]=7.;
     }
   //
@@ -231,7 +231,7 @@ void prepareData1(int rank, ProcessorGroup * grp, NatureOfField nature,
     {
       const double coordsS[10]={1.,0.,0.5,0.5,1.,0.5,0.5,1.,1.,1.};
       const double coordsT[6]={0.,0.,0.5,0.5,0.,1.};
-      meshS=MEDCouplingUMesh::New();
+      MUMesh meshS=MEDCouplingUMesh::New();
       meshS->setMeshDimension(2);
       DataArrayDouble *myCoords=DataArrayDouble::New();
       myCoords->alloc(5,2);
@@ -243,15 +243,14 @@ void prepareData1(int rank, ProcessorGroup * grp, NatureOfField nature,
       meshS->insertNextCell(INTERP_KERNEL::NORM_TRI3,3,connS);
       meshS->insertNextCell(INTERP_KERNEL::NORM_QUAD4,4,connS+3);
       meshS->finishInsertingCells();
-      ComponentTopology comptopo;
-      parameshS=new ParaMESH(meshS,*grp,"source mesh");
-      parafieldS=new ParaFIELD(ON_CELLS,NO_TIME,parameshS,comptopo);
-      parafieldS->getField()->setNature(nature);
-      double *valsS=parafieldS->getField()->getArray()->getPointer();
-      valsS[0]=9.;
-      valsS[1]=11.;
+      fieldS = MEDCouplingFieldDouble::New(ON_CELLS,NO_TIME);
+      DADouble arr = DataArrayDouble::New(); arr->alloc(meshS->getNumberOfCells(), 1);
+      fieldS->setMesh(meshS); fieldS->setArray(arr);
+      fieldS->setNature(nature);
+      double *valsS=fieldS->getArray()->getPointer();
+      valsS[0]=9.; valsS[1]=11.;
       //
-      meshT=MEDCouplingUMesh::New();
+      MUMesh meshT=MEDCouplingUMesh::New();
       meshT->setMeshDimension(2);
       myCoords=DataArrayDouble::New();
       myCoords->alloc(3,2);
@@ -262,10 +261,11 @@ void prepareData1(int rank, ProcessorGroup * grp, NatureOfField nature,
       meshT->allocateCells(1);
       meshT->insertNextCell(INTERP_KERNEL::NORM_TRI3,3,connT);
       meshT->finishInsertingCells();
-      parameshT=new ParaMESH(meshT,*grp,"target mesh");
-      parafieldT=new ParaFIELD(ON_CELLS,NO_TIME,parameshT,comptopo);
-      parafieldT->getField()->setNature(nature);
-      double *valsT=parafieldT->getField()->getArray()->getPointer();
+      fieldT = MEDCouplingFieldDouble::New(ON_CELLS,NO_TIME);
+      DADouble arr2 = DataArrayDouble::New(); arr2->alloc(meshT->getNumberOfCells(), 1);
+      fieldT->setMesh(meshT);  fieldT->setArray(arr2);
+      fieldT->setNature(nature);
+      double *valsT=fieldT->getArray()->getPointer();
       valsT[0]=8.;
     }
   //
@@ -273,7 +273,7 @@ void prepareData1(int rank, ProcessorGroup * grp, NatureOfField nature,
     {
       const double coordsS[8]={0.,0.5, 0.5,0.5, 0.,1., 0.5,1.};
       const double coordsT[6]={0.5,0.5,0.,1.,1.,1.};
-      meshS=MEDCouplingUMesh::New();
+      MUMesh meshS=MEDCouplingUMesh::New();
       meshS->setMeshDimension(2);
       DataArrayDouble *myCoords=DataArrayDouble::New();
       myCoords->alloc(4,2);
@@ -284,14 +284,14 @@ void prepareData1(int rank, ProcessorGroup * grp, NatureOfField nature,
       meshS->allocateCells(1);
       meshS->insertNextCell(INTERP_KERNEL::NORM_QUAD4,4,connS);
       meshS->finishInsertingCells();
-      ComponentTopology comptopo;
-      parameshS=new ParaMESH(meshS,*grp,"source mesh");
-      parafieldS=new ParaFIELD(ON_CELLS,NO_TIME,parameshS,comptopo);
-      parafieldS->getField()->setNature(nature);
-      double *valsS=parafieldS->getField()->getArray()->getPointer();
+      fieldS = MEDCouplingFieldDouble::New(ON_CELLS,NO_TIME);
+      DADouble arr = DataArrayDouble::New(); arr->alloc(meshS->getNumberOfCells(), 1);
+      fieldS->setMesh(meshS); fieldS->setArray(arr);
+      fieldS->setNature(nature);
+      double *valsS=fieldS->getArray()->getPointer();
       valsS[0]=10.;
       //
-      meshT=MEDCouplingUMesh::New();
+      MUMesh meshT=MEDCouplingUMesh::New();
       meshT->setMeshDimension(2);
       myCoords=DataArrayDouble::New();
       myCoords->alloc(3,2);
@@ -302,152 +302,15 @@ void prepareData1(int rank, ProcessorGroup * grp, NatureOfField nature,
       meshT->allocateCells(1);
       meshT->insertNextCell(INTERP_KERNEL::NORM_TRI3,3,connT);
       meshT->finishInsertingCells();
-      parameshT=new ParaMESH(meshT,*grp,"target mesh");
-      parafieldT=new ParaFIELD(ON_CELLS,NO_TIME,parameshT,comptopo);
-      parafieldT->getField()->setNature(nature);
-      double *valsT=parafieldT->getField()->getArray()->getPointer();
+      fieldT = MEDCouplingFieldDouble::New(ON_CELLS,NO_TIME);
+      DADouble arr2 = DataArrayDouble::New(); arr2->alloc(meshT->getNumberOfCells(), 1);
+      fieldT->setMesh(meshT); fieldT->setArray(arr2);
+      fieldT->setNature(nature);
+      double *valsT=fieldT->getArray()->getPointer();
       valsT[0]=9.;
     }
 }
 
-/*! Test case from the official doc of the OverlapDEC.
- *  WARNING: bounding boxes are tweaked here to make the case more interesting (i.e. to avoid an all to all exchange
- *  between all procs).
- */
-void ParaMEDMEMTest::testOverlapDEC1()
-{
-  int size, rank;
-  MPI_Comm_size(MPI_COMM_WORLD,&size);
-  MPI_Comm_rank(MPI_COMM_WORLD,&rank);
-  //  char hostname[256];
-  //  printf("(%d) PID %d on localhost ready for attach\n", rank, getpid());
-  //  fflush(stdout);
-
-//    if (rank == 1)
-//      {
-//        int i=1, j=0;
-//        while (i!=0)
-//          j=2;
-//      }
-
-  if (size != 3) return ;
-  int nproc = 3;
-  std::set<int> procs;
-  for (int i=0; i<nproc; i++)
-    procs.insert(i);
-
-  CommInterface interface;
-  OverlapDEC dec(procs);
-  ProcessorGroup * grp = dec.getGroup();
-  MEDCouplingUMesh* meshS=0, *meshT=0;
-  ParaMESH* parameshS=0, *parameshT=0;
-  ParaFIELD* parafieldS=0, *parafieldT=0;
-
-  MPI_Barrier(MPI_COMM_WORLD);
-  prepareData1(rank, grp, ConservativeVolumic, meshS, meshT, parameshS, parameshT, parafieldS, parafieldT);
-
-  /*!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-   *  HACK ON BOUNDING BOX TO MAKE THIS CASE SIMPLE AND USABLE IN DEBUG
-   * Bounding boxes are slightly smaller than should be, thus localizing the work to be done
-   * and avoiding every proc talking to everyone else.
-   * Obviously this is NOT a good idea to do this in production code :-)
-   * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-   */
-  dec.setBoundingBoxAdjustmentAbs(-1.0e-12);
-
-  dec.attachSourceLocalField(parafieldS);
-  dec.attachTargetLocalField(parafieldT);
-  dec.synchronize();
-  dec.sendRecvData(true);
-  //
-  MPI_Barrier(MPI_COMM_WORLD);
-  if(rank==0)
-    {
-      CPPUNIT_ASSERT_DOUBLES_EQUAL(8.75,parafieldT->getField()->getArray()->getIJ(0,0),1e-12);
-    }
-  if(rank==1)
-    {
-      CPPUNIT_ASSERT_DOUBLES_EQUAL(8.5,parafieldT->getField()->getArray()->getIJ(0,0),1e-12);
-    }
-  if(rank==2)
-    {
-      CPPUNIT_ASSERT_DOUBLES_EQUAL(10.5,parafieldT->getField()->getArray()->getIJ(0,0),1e-12);
-    }
-
-  delete parafieldS;
-  delete parafieldT;
-  delete parameshS;
-  delete parameshT;
-  meshS->decrRef();
-  meshT->decrRef();
-
-  MPI_Barrier(MPI_COMM_WORLD);
-}
-
-/*!
- * Same as testOverlapDEC1() but with regular bounding boxes. If you're looking for a nice debug case,
- * testOverlapDEC1() is identical in terms of geometry and field values, and more appropriate.
- */
-void ParaMEDMEMTest::testOverlapDEC2()
-{
-  int size, rank;
-  MPI_Comm_size(MPI_COMM_WORLD,&size);
-  MPI_Comm_rank(MPI_COMM_WORLD,&rank);
-
-  if (size != 3) return ;
-  int nproc = 3;
-  std::set<int> procs;
-  for (int i=0; i<nproc; i++)
-    procs.insert(i);
-
-//      if (rank == 0)
-//        {
-//          int i=1, j=0;
-//          while (i!=0)
-//            j=2;
-//        }
-
-
-  CommInterface interface;
-  OverlapDEC dec(procs);
-  ProcessorGroup * grp = dec.getGroup();
-  MEDCouplingUMesh* meshS=0, *meshT=0;
-  ParaMESH* parameshS=0, *parameshT=0;
-  ParaFIELD* parafieldS=0, *parafieldT=0;
-
-  MPI_Barrier(MPI_COMM_WORLD);
-  prepareData1(rank, grp, ConservativeVolumic,meshS, meshT, parameshS, parameshT, parafieldS, parafieldT);
-
-  /* Normal bounding boxes here: */
-  dec.setBoundingBoxAdjustmentAbs(+1.0e-12);
-
-  dec.attachSourceLocalField(parafieldS);
-  dec.attachTargetLocalField(parafieldT);
-  dec.synchronize();
-  dec.sendRecvData(true);
-  //
-  if(rank==0)
-    {
-      CPPUNIT_ASSERT_DOUBLES_EQUAL(8.75,parafieldT->getField()->getArray()->getIJ(0,0),1e-12);
-    }
-  if(rank==1)
-    {
-      CPPUNIT_ASSERT_DOUBLES_EQUAL(8.5,parafieldT->getField()->getArray()->getIJ(0,0),1e-12);
-    }
-  if(rank==2)
-    {
-      CPPUNIT_ASSERT_DOUBLES_EQUAL(10.5,parafieldT->getField()->getArray()->getIJ(0,0),1e-12);
-    }
-  delete parafieldS;
-  delete parafieldT;
-  delete parameshS;
-  delete parameshT;
-  meshS->decrRef();
-  meshT->decrRef();
-
-  MPI_Barrier(MPI_COMM_WORLD);
-}
-
 void prepareData2_buildOneSquare(MEDCouplingUMesh* & meshS_0, MEDCouplingUMesh* & meshT_0)
 {
   const double coords[10] = {0.0,0.0,  0.0,1.0,  1.0,1.0,  1.0,0.0, 0.5,0.5};
@@ -472,7 +335,6 @@ void prepareData2_buildOneSquare(MEDCouplingUMesh* & meshS_0, MEDCouplingUMesh*
   meshT_0->insertNextCell(INTERP_KERNEL::NORM_TRI3,3,connT+3);
   meshT_0->insertNextCell(INTERP_KERNEL::NORM_TRI3,3,connT+6);
   meshT_0->insertNextCell(INTERP_KERNEL::NORM_TRI3,3,connT+9);
-
 }
 
 /**
@@ -498,10 +360,10 @@ void prepareData2(int rank, ProcessorGroup * grp, NatureOfField nature,
   if(rank==0)
     {
       const double tr1[] = {1.5, 0.0};
-      MEDCouplingUMesh *meshS_1 = static_cast<MEDCouplingUMesh*>(meshS_0->deepCpy());
+      MEDCouplingUMesh *meshS_1 = static_cast<MEDCouplingUMesh*>(meshS_0->deepCopy());
       meshS_1->translate(tr1);
       const double tr2[] = {3.0, 0.0};
-      MEDCouplingUMesh *meshS_2 = static_cast<MEDCouplingUMesh*>(meshS_0->deepCpy());
+      MEDCouplingUMesh *meshS_2 = static_cast<MEDCouplingUMesh*>(meshS_0->deepCopy());
       meshS_2->translate(tr2);
 
       std::vector<const MEDCouplingUMesh*> vec;
@@ -528,7 +390,7 @@ void prepareData2(int rank, ProcessorGroup * grp, NatureOfField nature,
 
       //
       const double tr3[] = {0.0, -1.5};
-      MEDCouplingUMesh *meshT_3 = static_cast<MEDCouplingUMesh*>(meshT_0->deepCpy());
+      MEDCouplingUMesh *meshT_3 = static_cast<MEDCouplingUMesh*>(meshT_0->deepCopy());
       meshT_3->translate(tr3);
       vec.clear();
       vec.push_back(meshT_0);vec.push_back(meshT_3);
@@ -543,10 +405,10 @@ void prepareData2(int rank, ProcessorGroup * grp, NatureOfField nature,
   if(rank==1)
     {
       const double tr3[] = {0.0, -1.5};
-      MEDCouplingUMesh *meshS_3 = static_cast<MEDCouplingUMesh*>(meshS_0->deepCpy());
+      MEDCouplingUMesh *meshS_3 = static_cast<MEDCouplingUMesh*>(meshS_0->deepCopy());
       meshS_3->translate(tr3);
       const double tr4[] = {1.5, -1.5};
-      MEDCouplingUMesh *meshS_4 = static_cast<MEDCouplingUMesh*>(meshS_0->deepCpy());
+      MEDCouplingUMesh *meshS_4 = static_cast<MEDCouplingUMesh*>(meshS_0->deepCopy());
       meshS_4->translate(tr4);
 
       std::vector<const MEDCouplingUMesh*> vec;
@@ -567,13 +429,13 @@ void prepareData2(int rank, ProcessorGroup * grp, NatureOfField nature,
 
       //
       const double tr5[] = {1.5, 0.0};
-      MEDCouplingUMesh *meshT_1 = static_cast<MEDCouplingUMesh*>(meshT_0->deepCpy());
+      MEDCouplingUMesh *meshT_1 = static_cast<MEDCouplingUMesh*>(meshT_0->deepCopy());
       meshT_1->translate(tr5);
       const double tr6[] = {3.0, 0.0};
-      MEDCouplingUMesh *meshT_2 = static_cast<MEDCouplingUMesh*>(meshT_0->deepCpy());
+      MEDCouplingUMesh *meshT_2 = static_cast<MEDCouplingUMesh*>(meshT_0->deepCopy());
       meshT_2->translate(tr6);
       const double tr7[] = {1.5, -1.5};
-      MEDCouplingUMesh *meshT_4 = static_cast<MEDCouplingUMesh*>(meshT_0->deepCpy());
+      MEDCouplingUMesh *meshT_4 = static_cast<MEDCouplingUMesh*>(meshT_0->deepCopy());
       meshT_4->translate(tr7);
 
       vec.clear();
@@ -589,6 +451,113 @@ void prepareData2(int rank, ProcessorGroup * grp, NatureOfField nature,
   meshT_0->decrRef();
 }
 
+/*! Test case from the official doc of the OverlapDEC.
+ *  WARNING: bounding boxes might be tweaked here to make the case more interesting (i.e. to avoid an all to all exchange
+ *  between all procs).
+ */
+void testOverlapDEC_generic(int workSharingAlgo, double bbAdj)
+{
+  int size, rank;
+  MPI_Comm_size(MPI_COMM_WORLD,&size);
+  MPI_Comm_rank(MPI_COMM_WORLD,&rank);
+  //  char hostname[256];
+  //  printf("(%d) PID %d on localhost ready for attach\n", rank, getpid());
+  //  fflush(stdout);
+
+//    if (rank == 0)
+//      {
+//        int i=1, j=0;
+//        while (i!=0)
+//          j=2;
+//      }
+
+  if (size != 3) return ;
+  int nproc = 3;
+  std::set<int> procs;
+  for (int i=0; i<nproc; i++)
+    procs.insert(i);
+
+  CommInterface interface;
+  OverlapDEC dec(procs);
+  MEDCouplingFieldDouble * mcfieldS=0, *mcfieldT=0;
+
+  prepareData1(rank, IntensiveMaximum, mcfieldS, mcfieldT);
+
+  // See comment in the caller:
+  dec.setBoundingBoxAdjustmentAbs(bbAdj);
+  dec.setWorkSharingAlgo(workSharingAlgo);  // just to ease debugging
+
+  dec.attachSourceLocalField(mcfieldS);
+  dec.attachTargetLocalField(mcfieldT);
+  dec.synchronize();
+//  dec.debugPrintWorkSharing(std::cout);
+  dec.sendRecvData(true);
+  //
+  MPI_Barrier(MPI_COMM_WORLD);
+  if(rank==0)
+    {
+      CPPUNIT_ASSERT_DOUBLES_EQUAL(8.75,mcfieldT->getArray()->getIJ(0,0),1e-12);
+    }
+  if(rank==1)
+    {
+      CPPUNIT_ASSERT_DOUBLES_EQUAL(8.5,mcfieldT->getArray()->getIJ(0,0),1e-12);
+    }
+  if(rank==2)
+    {
+      CPPUNIT_ASSERT_DOUBLES_EQUAL(10.5,mcfieldT->getArray()->getIJ(0,0),1e-12);
+    }
+
+  mcfieldS->decrRef();
+  mcfieldT->decrRef();
+
+  MPI_Barrier(MPI_COMM_WORLD);
+}
+
+void ParaMEDMEMTest::testOverlapDEC1()
+{
+  /*!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   *  HACK ON BOUNDING BOX TO MAKE THIS CASE SIMPLE AND USABLE IN DEBUG
+   * Bounding boxes are slightly smaller than should be, thus localizing the work to be done
+   * and avoiding every proc talking to everyone else.
+   * Obviously this is NOT a good idea to do this in production code :-)
+   * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   */
+  testOverlapDEC_generic(0,-1.0e-12);
+}
+
+void ParaMEDMEMTest::testOverlapDEC1_bis()
+{
+   // Same BB hack as above
+  testOverlapDEC_generic(1,-1.0e-12);
+}
+
+void ParaMEDMEMTest::testOverlapDEC1_ter()
+{
+   // Same BB hack as above
+  testOverlapDEC_generic(2, -1.0e-12);
+}
+
+
+/*!
+ * Same as testOverlapDEC1() but with regular bounding boxes. If you're looking for a nice debug case,
+ * testOverlapDEC1() is identical in terms of geometry and field values, and more appropriate.
+ */
+void ParaMEDMEMTest::testOverlapDEC2()
+{
+  testOverlapDEC_generic(0,1.0e-12);
+}
+
+void ParaMEDMEMTest::testOverlapDEC2_bis()
+{
+  testOverlapDEC_generic(1,1.0e-12);
+}
+
+void ParaMEDMEMTest::testOverlapDEC2_ter()
+{
+  testOverlapDEC_generic(2,1.0e-12);
+}
+
+
 /*! Test focused on the mapping of cell IDs.
  * (i.e. when only part of the source/target mesh is transmitted)
  */
@@ -611,7 +580,7 @@ void ParaMEDMEMTest::testOverlapDEC3()
   ParaMESH* parameshS=0, *parameshT=0;
   ParaFIELD* parafieldS=0, *parafieldT=0;
 
-  prepareData2(rank, grp, ConservativeVolumic, meshS, meshT, parameshS, parameshT, parafieldS, parafieldT);
+  prepareData2(rank, grp, IntensiveMaximum, meshS, meshT, parameshS, parameshT, parafieldS, parafieldT);
 
   dec.attachSourceLocalField(parafieldS);
   dec.attachTargetLocalField(parafieldT);
@@ -621,7 +590,7 @@ void ParaMEDMEMTest::testOverlapDEC3()
   MEDCouplingFieldDouble * resField = parafieldT->getField();
   if(rank==0)
     {
-      CPPUNIT_ASSERT_EQUAL(8, resField->getNumberOfTuples());
+      CPPUNIT_ASSERT_EQUAL(8, (int)resField->getNumberOfTuples());
       for(int i=0;i<4;i++)
         CPPUNIT_ASSERT_DOUBLES_EQUAL(1.0,resField->getArray()->getIJ(i,0),1e-12);
       for(int i=4;i<8;i++)
@@ -629,7 +598,7 @@ void ParaMEDMEMTest::testOverlapDEC3()
     }
   if(rank==1)
     {
-      CPPUNIT_ASSERT_EQUAL(12, resField->getNumberOfTuples());
+      CPPUNIT_ASSERT_EQUAL(12, (int)resField->getNumberOfTuples());
       for(int i=0;i<4;i++)
         CPPUNIT_ASSERT_DOUBLES_EQUAL(2.0,resField->getArray()->getIJ(i,0),1e-12);
       for(int i=4;i<8;i++)
@@ -672,7 +641,7 @@ void ParaMEDMEMTest::testOverlapDEC4()
   ParaFIELD* parafieldS=0, *parafieldT=0;
 
   // As before, except than one of the source cell is removed, and that the field now has 2 components
-  prepareData2(rank, grp, ConservativeVolumic, meshS, meshT, parameshS, parameshT, parafieldS, parafieldT,
+  prepareData2(rank, grp, IntensiveMaximum, meshS, meshT, parameshS, parameshT, parafieldS, parafieldT,
                true, 2);
 //  if (rank == 1)
 //    {
@@ -691,7 +660,7 @@ void ParaMEDMEMTest::testOverlapDEC4()
   MEDCouplingFieldDouble * resField = parafieldT->getField();
   if(rank==0)
     {
-      CPPUNIT_ASSERT_EQUAL(8, resField->getNumberOfTuples());
+      CPPUNIT_ASSERT_EQUAL(8, (int)resField->getNumberOfTuples());
       for(int i=0;i<4;i++)
         {
           CPPUNIT_ASSERT_DOUBLES_EQUAL(1.0,resField->getArray()->getIJ(i*2,0),1e-12);
@@ -705,7 +674,7 @@ void ParaMEDMEMTest::testOverlapDEC4()
     }
   if(rank==1)
     {
-      CPPUNIT_ASSERT_EQUAL(12, resField->getNumberOfTuples());
+      CPPUNIT_ASSERT_EQUAL(12, (int)resField->getNumberOfTuples());
       for(int i=0;i<4;i++)
         {
           CPPUNIT_ASSERT_DOUBLES_EQUAL(2.0,resField->getArray()->getIJ(i*2,0),1e-12);
@@ -731,6 +700,5 @@ void ParaMEDMEMTest::testOverlapDEC4()
   meshT->decrRef();
 
   MPI_Barrier(MPI_COMM_WORLD);
-
 }