SundanceNodalDOFMapHN.cpp

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// 
//                              Sundance
//                 Copyright (2005) Sandia Corporation
// 
// Copyright (year first published) Sandia Corporation.  Under the terms 
// of Contract DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government 
// retains certain rights in this software.
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// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
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// Lesser General Public License for more details.
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#include "SundanceMap.hpp"
#include "PlayaTabs.hpp"
#include "SundanceOut.hpp"
#include "SundanceOrderedTuple.hpp"
#include "SundanceNodalDOFMapHN.hpp"
#include "SundanceLagrange.hpp"
#include "PlayaMPIContainerComm.hpp"
#include "Teuchos_TimeMonitor.hpp"


using namespace Sundance;
using namespace Teuchos;
using Playa::MPIComm;
using Playa::MPIContainerComm;

NodalDOFMapHN::NodalDOFMapHN(const Mesh& mesh,
  int nFuncs, 
  const CellFilter& maxCellFilter,
  int setupVerb)
  : HNDoFMapBaseHomogeneous(mesh, nFuncs, setupVerb),
    maxCellFilter_(maxCellFilter),
    dim_(mesh.spatialDim()),
    nFuncs_(nFuncs),
    nElems_(mesh.numCells(mesh.spatialDim())),
    nNodes_(mesh.numCells(0)),
    nNodesPerElem_(mesh.numFacets(mesh.spatialDim(),0,0)),
    elemDofs_(nElems_ * nFuncs * nNodesPerElem_),
    nodeDofs_(mesh.numCells(0)*nFuncs_, -2),
    structure_(rcp(new MapStructure(nFuncs_, rcp(new Lagrange(1))))),
    hasCellHanging_(nElems_),
    nodeIsHanging_(nElems_ * nFuncs * nNodesPerElem_),
    cellsWithHangingDoF_globalDoFs_(),
    cells_To_NodeLIDs_(),
    hangingNodeLID_to_NodesLIDs_(),
    hangindNodeLID_to_Coefs_(),
    matrixStore_(),
    facetLID_()
{
  // init the matrix store with one chunck
  matrixStore_.init(1);
  init();
}

void NodalDOFMapHN::init()
{ 
  Tabs tab;

  SUNDANCE_MSG2(setupVerb(), tab << "NodalDOFMapHN initializing nodal DOF map nrFunc:"
      << nFuncs_ << "  nNodes_:" << nNodes_ << " nElems_:" <<nElems_);

  Array<Array<int> > remoteNodes(mesh().comm().getNProc());
  Array<int> hasProcessedCell(nNodes_, 0);

  /* start the DOF count at zero. */
  int nextDOF = 0;
  int owner;

  nFacets_ = mesh().numFacets(dim_, 0, 0);
  Array<int> elemLID(nElems_);
  Array<int> facetOrientations(nFacets_*nElems_);

  /* Assign node DOFs for locally owned 0-cells */
  CellSet maxCells = maxCellFilter_.getCells(mesh());

  int cc = 0;
  for (CellIterator iter=maxCells.begin(); iter != maxCells.end(); iter++, cc++)
    {
      int c = *iter;
      elemLID[cc] = c;
    }
  /* look up the LIDs of the facets (points)*/
  /* This is important so that we have locality in the DOF numbering */
  mesh().getFacetLIDs(dim_, elemLID, 0, facetLID_, facetOrientations);
  
  for (int c=0; c<nElems_; c++) {
    hasCellHanging_[c] = false;
      /* for each facet, process its DOFs */
      for (int f=0; f<nFacets_; f++) {
          /* if the facet's DOFs have been assigned already,
           * we're done */
          int fLID = facetLID_[c*nFacets_+f];
          SUNDANCE_MSG2(setupVerb(), "NodalDOFMapHN::init() CellLID:"<< c <<"Try point LID:" << fLID << " facet:" << f);
          if (hasProcessedCell[fLID] == 0) {
              /* the facet may be owned by another processor */
            /* Do this only when that node is not HANGING! */
              if ( isRemote(0, fLID, owner) && (!mesh().isElementHangingNode(0,fLID)) ) {
                  int facetGID 
                    = mesh().mapLIDToGID(0, fLID);
                  remoteNodes[owner].append(facetGID);
                }
              else {/* we can assign a DOF locally */
                  SUNDANCE_MSG2(setupVerb(), "NodalDOFMapHN::init() Doing point LID:" << fLID << " facet:" << f);
                    // test if the node is not a hanging node
                    if ( mesh().isElementHangingNode(0,fLID) == false ){
                       /* assign DOFs , (for each function space) */
                       for (int i=0; i<nFuncs_; i++){
                          nodeDofs_[fLID*nFuncs_ + i] = nextDOF;
                          nextDOF++;
                       }
                    } else {
                       SUNDANCE_MSG2(setupVerb(), "NodalDOFMapHN::init() Hanging node found LID:" << fLID);
                       hasCellHanging_[c] = true;
                       for (int i=0; i<nFuncs_; i++){
                         nodeDofs_[fLID*nFuncs_ + i] = -1; // this means that this is not golbal DoF
                       }
                       Array<int> pointsLIDs;
                       Array<int> facetIndex;
                       Array<double> coefs;
                       // get the global DoFs which contribute (what if that is not yet numbered?, then only the "fLIDs")
                       getPointLIDsForHN( fLID, f, c , pointsLIDs, coefs , facetIndex);

                     // also store the corresponding coefficients
                       hangingNodeLID_to_NodesLIDs_.put( fLID , pointsLIDs );
                       hangindNodeLID_to_Coefs_.put(fLID,coefs);
                    }
                }
              hasProcessedCell[fLID] = 1;
            }
            // if this node is hanging then mark the cell as hanging
            if (mesh().isElementHangingNode(0,fLID) == true) {
                    hasCellHanging_[c] = true;
            }
       }
  }
  
  //SUNDANCE_MSG2(setupVerb(), "Before Communication: " << nodeDofs_);

  /* Compute offsets for each processor */
  int localCount = nextDOF;
  computeOffsets(localCount);
  
  /* Resolve remote DOF numbers */
  shareRemoteDOFs(remoteNodes);

  //SUNDANCE_MSG2(setupVerb(), "After Communication: " << nodeDofs_);

  /* Assign DOFs for elements */
  for (int c=0; c<nElems_; c++)
    {
      if (hasCellHanging_[c]){
        Array<int> HNDoFs(nFacets_);
        Array<double> transMatrix;
        Array<double> coefs;

        transMatrix.resize(nFacets_*nFacets_);
        for (int ii = 0 ; ii < nFacets_*nFacets_ ; ii++) transMatrix[ii] = 0.0;

        for (int f=0; f<nFacets_; f++)
        {
          int fLID = facetLID_[c*nFacets_+f];
        SUNDANCE_MSG2(setupVerb(), tab << "NodalDOFMapHN cell:" << c << " facetLID:" << fLID
              << " hanging:"<< nodeDofs_[fLID*nFuncs_] << "  array:" << HNDoFs);
              if (nodeDofs_[fLID*nFuncs_] < 0)
              {
                  Array<int> pointsLIDs;
                  Array<int> facetIndex;
                  Array<double> coefs;
                  // get the composing points
                  getPointLIDsForHN( fLID, f, c , pointsLIDs, coefs , facetIndex);

                  for (int j=0 ; j < pointsLIDs.size() ; j++){
                    // look for tmpArray[j] in the existing set, put there coefs[j]
                    HNDoFs[facetIndex[j]] = pointsLIDs[j];
                    transMatrix[f*nFacets_  + facetIndex[j]] = coefs[j];
                  }
              }
              else
              {
                // look for fLID in the actual set and put there 1.0, if not found then size+1
                HNDoFs[f] = fLID;
                transMatrix[f*nFacets_  + f] = 1.0;
              }
        }
        // store the matrix corresponding to this cell
        int matrixIndex = matrixStore_.addMatrix(0,transMatrix);
        maxCellLIDwithHN_to_TrafoMatrix_.put( c , matrixIndex );

        // store the point LID's which contribute to this cell
        cellsWithHangingDoF_globalDoFs_.put( c , HNDoFs );

        SUNDANCE_MSG2(setupVerb(), tab << "NodalDOFMapHN initializing cellLID:" << c << " array:" << HNDoFs);
        SUNDANCE_MSG2(setupVerb(), tab << "NodalDOFMapHN initializing cellLID:" << c << " Trafo array:" << transMatrix);

        // add the global DOFs to the array
        for (int f=0; f<nFacets_; f++)
        {
           int fLID = HNDoFs[f];
           for (int i=0; i<nFuncs_; i++) {
            elemDofs_[(c*nFuncs_+i)*nFacets_ + f] = nodeDofs_[fLID*nFuncs_ + i];
           }

        }
        SUNDANCE_MSG2(setupVerb(),tab << "NodalDOFMapHN HN initializing cellLID:" << c << " elemDofs_:" << elemDofs_);
      }
      else {
    /* set the element DOFs given the dofs of the facets */
        for (int f=0; f<nFacets_; f++)
        {
          int fLID = facetLID_[c*nFacets_+f];
          for (int i=0; i<nFuncs_; i++)
          {
            elemDofs_[(c*nFuncs_+i)*nFacets_ + f] = nodeDofs_[fLID*nFuncs_ + i];
          }
        }
          SUNDANCE_MSG2(setupVerb(),tab << "NodalDOFMapHN initializing cellLID:" << c << " elemDofs_:" << elemDofs_);
      }
    }
  SUNDANCE_MSG2(setupVerb(),tab << "NodalDOFMapHN initializing DONE");

}

RCP<const MapStructure>
NodalDOFMapHN::getDOFsForCellBatch(int cellDim,
  const Array<int>& cellLID,
  const Set<int>& requestedFuncSet,
  Array<Array<int> >& dofs,
  Array<int>& nNodes,
  int verbosity) const
{
  TimeMonitor timer(batchedDofLookupTimer());

  Tabs tab;
  SUNDANCE_MSG2(verbosity,
               tab << "NodalDOFMapHN::getDOFsForCellBatch(): cellDim=" << cellDim
               << " requestedFuncSet:" << requestedFuncSet
               << " cellLID=" << cellLID);


  dofs.resize(1);
  nNodes.resize(1);

  int nCells = cellLID.size();


  if (cellDim == dim_)
    {
      int dofsPerElem = nFuncs_ * nNodesPerElem_;
      nNodes[0] = nNodesPerElem_;
      dofs[0].resize(nCells * dofsPerElem);
      Array<int>& dof0 = dofs[0];
      Array<int> tmpArray;

    tmpArray.resize(dofsPerElem);

      for (int c=0; c<nCells; c++)
        {
          // here , nothing to do ... in elemDofs_ should be the proper DoFs
            for (int i=0; i<dofsPerElem; i++) {
               dof0[c*dofsPerElem + i] = elemDofs_[cellLID[c]*dofsPerElem+i];
               tmpArray[i] = elemDofs_[cellLID[c]*dofsPerElem+i];
            }
            SUNDANCE_MSG2(verbosity,tab << "NodalDOFMapHN::getDOFsForCellBatch cellDim:" <<
                cellDim << " cellLID:" << c << " array:" << tmpArray);
        }
    }
  else if (cellDim == 0)
    { // point integrals are also mostly used for BCs
      nNodes[0] = 1;
      dofs[0].resize(nCells * nFuncs_);
      Array<int>& dof0 = dofs[0];
      Array<int> tmpArray;
    tmpArray.resize(nFuncs_);

      for (int c=0; c<nCells; c++)
        {
          for (int i=0; i<nFuncs_; i++)
            {
              dof0[c*nFuncs_ + i] = nodeDofs_[cellLID[c]*nFuncs_+i];
              tmpArray[i] = nodeDofs_[cellLID[c]*nFuncs_+i];
            }
          SUNDANCE_MSG2(verbosity,tab << "NodalDOFMapHN::getDOFsForCellBatch cellDim:" <<
              cellDim << " pointLID:" << cellLID[c] << " array:" << tmpArray);
        }
    }
  else
    {
    // since edge or surface Integrals are mostly used for BCs, where are NO HN
      int nFacets = mesh().numFacets(cellDim, cellLID[0], 0);
      nNodes[0] = nFacets;
      int dofsPerCell = nFuncs_ * nNodes[0];
      dofs[0].resize(nCells * dofsPerCell);
      Array<int>& dof0 = dofs[0];
      Array<int> facetLIDs(nCells * nNodes[0]);
      Array<int> dummy(nCells * nNodes[0]);
      Array<int> tmpArray;
    tmpArray.resize(nFuncs_*nFacets);

      mesh().getFacetLIDs(cellDim, cellLID, 0, facetLIDs, dummy);

      for (int c=0; c<nCells; c++)
        {
          for (int f=0; f<nFacets; f++)
            {
              int facetCellLID = facetLIDs[c*nFacets+f];
              for (int i=0; i<nFuncs_; i++)
                {
                  dof0[(c*nFuncs_+i)*nFacets + f]
                    = nodeDofs_[facetCellLID*nFuncs_+i];
                  // when we want to pass a hanging DoF , we correct the result
                  if ( nodeDofs_[facetCellLID*nFuncs_+i] < 0){
                    int tmp = 1;
                    // get any cell which has this element
                    int maxCell = mesh().maxCofacetLID( cellDim , cellLID[c] , 0 , tmp);
                      Array<int> facetsLIDs;
                      mesh().returnParentFacets( maxCell , 0 , facetsLIDs , tmp );
                      // get in the same way the point children from the child cell
                      Array<int> childFacets(mesh().numFacets(mesh().spatialDim(),0,0));
                      for (int jk = 0 ; jk < childFacets.size() ; jk++)
                        childFacets[jk] = mesh().facetLID( mesh().spatialDim() , maxCell, 0 , jk , tmp);
                      int fIndex = 0;
                      // get the correct point facet index, by comparing the child cell point facets to the HN LID
                      for (int jk = 0 ; jk < childFacets.size() ; jk++)
                        if ( childFacets[jk] == facetCellLID) { fIndex = jk; break;}
                      dof0[(c*nFuncs_+i)*nFacets + f] = nodeDofs_[facetsLIDs[fIndex]*nFuncs_ + i];
                  }
                  tmpArray[f*nFuncs_+i] = dof0[(c*nFuncs_+i)*nFacets + f];
                }
            }
          SUNDANCE_MSG2(verbosity,tab << "NodalDOFMapHN::getDOFsForCellBatch cellDim:" <<
              cellDim << " edge or face LID:" << cellLID[c] << " array:" << tmpArray);
        }
    }
  SUNDANCE_MSG2(verbosity,
                tab << "NodalDOFMapHN::getDOFsForCellBatch(): DONE");
  return structure_;
}


void NodalDOFMapHN::getTrafoMatrixForCell(
      int cellLID,
      int funcID,
      int& trafoMatrixSize,
      bool& doTransform,
      Array<double>& transfMatrix ) const {

  trafoMatrixSize = nFacets_;

  if (cellsWithHangingDoF_globalDoFs_.containsKey(cellLID))
  {
    // return the transformation matrix from the Map
    int matrixIndex = maxCellLIDwithHN_to_TrafoMatrix_.get( cellLID ); // this should return a valid array
    matrixStore_.getMatrix( 0 , matrixIndex , transfMatrix );
    doTransform = true;
  }
  else  // no transformation needed, return false
  {
    doTransform = false;
  }
}

void NodalDOFMapHN::getTrafoMatrixForFacet(
      int cellDim,
      int cellLID,
      int facetIndex,
      int funcID,
      int& trafoMatrixSize,
      bool& doTransform,
      Array<double>& transfMatrix ) const {

  int fIndex;
  int maxCellLID;
  // here we ask for cofacet 0 , assuming that these are anyhow boundary facets
  SUNDANCE_MSG2(setupVerb() , "NodalDOFMapHN::getTrafoMatrixForFacet() cellDim :" << cellDim << ", cellLID:" << cellLID);
  maxCellLID = mesh().maxCofacetLID( cellDim, cellLID, 0 , fIndex);
  SUNDANCE_MSG2(setupVerb() , "NodalDOFMapHN::getTrafoMatrixForFacet() testing :" << maxCellLID);

  // todo: we might pre filter cases when this is not necessary

  if (cellsWithHangingDoF_globalDoFs_.containsKey(maxCellLID))
  {
    int matrixIndex    =    maxCellLIDwithHN_to_TrafoMatrix_.get( maxCellLID );
    matrixStore_.getMatrix( 0 , matrixIndex , transfMatrix );
    doTransform = true;
  }
  else  // no transformation needed, return false
  {
    doTransform = false;
  }
}

/** Function for nodal plotting */
void NodalDOFMapHN::getDOFsForHNCell(
    int cellDim,
    int cellLID,
      int funcID,
      Array<int>& dofs ,
      Array<double>& coefs ) const {

  // treat the cells only of dimension zero
  if (  (cellDim == 0) && (hangingNodeLID_to_NodesLIDs_.containsKey(cellLID))  )
  {
    Array<int> pointLIDs;
    Array<int> pointCoefs;
    pointLIDs = hangingNodeLID_to_NodesLIDs_.get( cellLID );
    dofs.resize(pointLIDs.size());
    // return the DoFs belonging to the points and function which collaborate to the hanging node
    for (int ind = 0 ; ind < pointLIDs.size() ; ind++){
      dofs[ind] = nodeDofs_[ pointLIDs[ind] *nFuncs_ + funcID ]; // return the DoF corresp. to function ID
    }
    // get the coefficients
    coefs = hangindNodeLID_to_Coefs_.get( cellLID );
  }
}

/** This function is only for TRISECTION implemented */
// we might use the method of BasisFunction->getConstraintForHN(), but this should be faster
void NodalDOFMapHN::getPointLIDsForHN( int pointLID , int facetIndex ,
    int maxCellIndex ,Array<int>& glbLIDs, Array<double>& coefsArray , Array<int>& nodeIndex){

  Array<int> facets;
    int indexInParent , parentLID , facetCase = 0;
    double divRatio = 0.5;
  switch (dim_){
  case 2:
    // todo: eventually implement bisection as well (if it will be needed)
    glbLIDs.resize(2);
    nodeIndex.resize(2);
    indexInParent = mesh().indexInParent(maxCellIndex);
    switch (indexInParent){
      case 0: {facetCase = (facetIndex == 1)? 0 : 1;
              divRatio = (1.0/3.0);  break;}
      case 1: {facetCase = 0;
              divRatio = (facetIndex == 0)? (1.0/3.0) : (2.0/3.0);  break;}
      case 2: {facetCase = (facetIndex == 0)? 0 : 2;
                  divRatio = (facetIndex == 0)? (2.0/3.0) : (1.0/3.0);  break;}
      case 5: {facetCase = 1;
                  divRatio = (facetIndex == 0)? (1.0/3.0) : (2.0/3.0);  break;}
      case 3: {facetCase = 2;
                  divRatio = (facetIndex == 1)? (1.0/3.0) : (2.0/3.0);  break;}
      case 6: {facetCase = (facetIndex == 0)? 1 : 3;
                  divRatio = (facetIndex == 0)? (2.0/3.0) : (1.0/3.0);  break;}
      case 7: {facetCase = 3;
                  divRatio = (facetIndex == 2)? (1.0/3.0) : (2.0/3.0);  break;}
      case 8: {facetCase = (facetIndex == 1)? 2 : 3;
                  divRatio = (2.0/3.0);  break;}
    }
    mesh().returnParentFacets(maxCellIndex , 0 ,facets , parentLID );
    switch (facetCase){
       case 0: {glbLIDs[0] = facets[0]; glbLIDs[1] = facets[1];
                nodeIndex[0] = 0;  nodeIndex[1] = 1;  break;}
       case 1: {glbLIDs[0] = facets[0]; glbLIDs[1] = facets[2];
                nodeIndex[0] = 0;  nodeIndex[1] = 2;  break;}
       case 2: {glbLIDs[0] = facets[1]; glbLIDs[1] = facets[3];
                nodeIndex[0] = 1;  nodeIndex[1] = 3;   break;}
       case 3: {glbLIDs[0] = facets[2]; glbLIDs[1] = facets[3];
                nodeIndex[0] = 2;  nodeIndex[1] = 3;  break;}
    }
     coefsArray.resize(2); coefsArray[0] = 1 - divRatio; coefsArray[1] = divRatio;
     SUNDANCE_MSG2(setupVerb(),"NodalDOFMapHN::getPointLIDsForHN() fc=" << facetCase << " R=" << divRatio
                   << " facetIndex:" << facetIndex <<   " indexInParent:" << indexInParent <<" glbLIDs:"
                   << glbLIDs << " maxCellIndex:" << maxCellIndex << " nodeIndex:" << nodeIndex);
    break;
  case 3:{
        // 3D hanging node
    double ind_x = 0 , ind_y = 0 , ind_z = 0;
    double f_x = 0.0 , f_y = 0.0 , f_z = 0.0;
    double xx = 0.0  , yy = 0.0  , zz = 0.0;
    double values[8];
    indexInParent = mesh().indexInParent(maxCellIndex);
    mesh().returnParentFacets(maxCellIndex , 0 ,facets , parentLID );
    //
    switch (indexInParent){
      case 0:  { ind_x = 0.0; ind_y = 0.0; ind_z = 0.0; break;}
      case 1:  { ind_x = 1.0; ind_y = 0.0; ind_z = 0.0; break;}
      case 2:  { ind_x = 2.0; ind_y = 0.0; ind_z = 0.0; break;}
      case 3:  { ind_x = 0.0; ind_y = 1.0; ind_z = 0.0; break;}
      case 4:  { ind_x = 1.0; ind_y = 1.0; ind_z = 0.0; break;}
      case 5:  { ind_x = 2.0; ind_y = 1.0; ind_z = 0.0; break;}
      case 6:  { ind_x = 0.0; ind_y = 2.0; ind_z = 0.0; break;}
      case 7:  { ind_x = 1.0; ind_y = 2.0; ind_z = 0.0; break;}
      case 8:  { ind_x = 2.0; ind_y = 2.0; ind_z = 0.0; break;}
      case 9:  { ind_x = 0.0; ind_y = 0.0; ind_z = 1.0; break;}
      case 10: { ind_x = 1.0; ind_y = 0.0; ind_z = 1.0; break;}
      case 11: { ind_x = 2.0; ind_y = 0.0; ind_z = 1.0; break;}
      case 12: { ind_x = 0.0; ind_y = 1.0; ind_z = 1.0; break;}
      case 14: { ind_x = 2.0; ind_y = 1.0; ind_z = 1.0; break;}
      case 15: { ind_x = 0.0; ind_y = 2.0; ind_z = 1.0; break;}
      case 16: { ind_x = 1.0; ind_y = 2.0; ind_z = 1.0; break;}
      case 17: { ind_x = 2.0; ind_y = 2.0; ind_z = 1.0; break;}
      case 18: { ind_x = 0.0; ind_y = 0.0; ind_z = 2.0; break;}
      case 19: { ind_x = 1.0; ind_y = 0.0; ind_z = 2.0; break;}
      case 20: { ind_x = 2.0; ind_y = 0.0; ind_z = 2.0; break;}
      case 21: { ind_x = 0.0; ind_y = 1.0; ind_z = 2.0; break;}
      case 22: { ind_x = 1.0; ind_y = 1.0; ind_z = 2.0; break;}
      case 23: { ind_x = 2.0; ind_y = 1.0; ind_z = 2.0; break;}
      case 24: { ind_x = 0.0; ind_y = 2.0; ind_z = 2.0; break;}
      case 25: { ind_x = 1.0; ind_y = 2.0; ind_z = 2.0; break;}
      case 26: { ind_x = 2.0; ind_y = 2.0; ind_z = 2.0; break;}
      default: {}// error this should not occur
    }
    switch (facetIndex){
      case 0:  { f_x = 0.0 , f_y = 0.0 , f_z = 0.0; break;}
      case 1:  { f_x = 1.0 , f_y = 0.0 , f_z = 0.0; break;}
      case 2:  { f_x = 0.0 , f_y = 1.0 , f_z = 0.0; break;}
      case 3:  { f_x = 1.0 , f_y = 1.0 , f_z = 0.0; break;}
      case 4:  { f_x = 0.0 , f_y = 0.0 , f_z = 1.0; break;}
      case 5:  { f_x = 1.0 , f_y = 0.0 , f_z = 1.0; break;}
      case 6:  { f_x = 0.0 , f_y = 1.0 , f_z = 1.0; break;}
      case 7:  { f_x = 1.0 , f_y = 1.0 , f_z = 1.0; break;}
      default: {}// error this should not occur
    }
    // evaluate the bilinear basis function at the given point
      xx = (ind_x + f_x)/3.0;
      yy = (ind_y + f_y)/3.0;
      zz = (ind_z + f_z)/3.0;
      values[0] = (1.0 - xx)*(1.0 - yy)*(1.0 - zz);
      values[1] = (xx)*(1.0 - yy)*(1.0 - zz);
      values[2] = (1.0 - xx)*(yy)*(1.0 - zz);
      values[3] = (xx)*(yy)*(1.0 - zz);
      values[4] = (1.0 - xx)*(1.0 - yy)*(zz);
      values[5] = (xx)*(1.0 - yy)*(zz);
      values[6] = (1.0 - xx)*(yy)*(zz);
      values[7] = (xx)*(yy)*(zz);
    // resize the array to zero and add
      glbLIDs.resize(0);
      nodeIndex.resize(0);
      coefsArray.resize(0);
      for (int ii = 0 ; ii < 8 ; ii++ ){
        // add the facet point if the basis is not zero
        if (fabs(values[ii]) > 1e-5){
          glbLIDs.append(facets[ii]);
          nodeIndex.append(ii);
          coefsArray.append(values[ii]);
        }
      }
      SUNDANCE_MSG2(setupVerb(),"NodalDOFMapHN::getPointLIDsForHN()" << " facetIndex:" << facetIndex << " indexInParent:"
         << indexInParent <<" glbLIDs:" << glbLIDs << " maxCellIndex:" << maxCellIndex << " nodeIndex:" << nodeIndex);
    break;
      }
  }

}



void NodalDOFMapHN::computeOffsets(int localCount)
{
  Array<int> dofOffsets;
  int totalDOFCount;
  int myOffset = 0;
  int np = mesh().comm().getNProc();
  if (np > 1)
    {
    SUNDANCE_MSG2(setupVerb(),"NodalDOFMapHN::computeOffsets, localCount:" << localCount);
      MPIContainerComm<int>::accumulate(localCount, dofOffsets, totalDOFCount,
                                        mesh().comm());
      myOffset = dofOffsets[mesh().comm().getRank()];

      SUNDANCE_MSG2(setupVerb(),"NodalDOFMapHN::computeOffsets, offset:" << myOffset);
      int nDofs = nNodes_ * nFuncs_;
      for (int i=0; i<nDofs; i++)
        {
          if (nodeDofs_[i] >= 0) nodeDofs_[i] += myOffset;
        }
    }
  else
    {
      totalDOFCount = localCount;
    }
  
  setLowestLocalDOF(myOffset);
  setNumLocalDOFs(localCount);
  setTotalNumDOFs(totalDOFCount);
}


void NodalDOFMapHN::shareRemoteDOFs(const Array<Array<int> >& outgoingCellRequests)
{
  int np = mesh().comm().getNProc();
  if (np==1) return;
  int rank = mesh().comm().getRank();

  Array<Array<int> > incomingCellRequests;
  Array<Array<int> > outgoingDOFs(np);
  Array<Array<int> > incomingDOFs;

  SUNDANCE_MSG2(setupVerb(),
               "p=" << mesh().comm().getRank()
               << "synchronizing DOFs for cells of dimension 0");
  SUNDANCE_MSG2(setupVerb(),
               "p=" << mesh().comm().getRank()
               << " sending cell reqs d=0, GID=" 
               << outgoingCellRequests);

  /* share the cell requests */
  MPIContainerComm<int>::allToAll(outgoingCellRequests, 
                                  incomingCellRequests,
                                  mesh().comm());
  
  /* get DOF numbers for the zeroth function index on every node that's been 
   * requested by someone else */
  for (int p=0; p<np; p++)
    {
      if (p==rank) continue;
      const Array<int>& requestsFromProc = incomingCellRequests[p];
      int nReq = requestsFromProc.size();

      SUNDANCE_MSG3(setupVerb(),"p=" << mesh().comm().getRank()
                            << " recv'd from proc=" << p
                            << " reqs for DOFs for cells " 
                            << requestsFromProc);

      outgoingDOFs[p].resize(nReq);

      for (int c=0; c<nReq; c++)
        {
          int GID = requestsFromProc[c];
          SUNDANCE_MSG2(setupVerb(),
                       "p=" << rank
                       << " processing zero-cell with GID=" << GID); 
          int LID = mesh().mapGIDToLID(0, GID);
          SUNDANCE_MSG2(setupVerb(),
                       "p=" << rank
                       << " LID=" << LID << " dofs=" 
                       << nodeDofs_[LID*nFuncs_]);
          outgoingDOFs[p][c] = nodeDofs_[LID*nFuncs_];
          SUNDANCE_MSG2(setupVerb(),
                       "p=" << rank
                       << " done processing cell with GID=" << GID);
        }
    }

  SUNDANCE_MSG2(setupVerb(),
               "p=" << mesh().comm().getRank()
               << "answering DOF requests for cells of dimension 0");

  /* share the DOF numbers */
  MPIContainerComm<int>::allToAll(outgoingDOFs,
                                  incomingDOFs,
                                  mesh().comm());

  SUNDANCE_MSG2(setupVerb(),
               "p=" << mesh().comm().getRank()
               << "communicated DOF answers for cells of dimension 0" );

  
  /* now assign the DOFs from the other procs */

  for (int p=0; p<mesh().comm().getNProc(); p++)
    {
      if (p==mesh().comm().getRank()) continue;
      const Array<int>& dofsFromProc = incomingDOFs[p];
      int numCells = dofsFromProc.size();
      for (int c=0; c<numCells; c++)
        {
          int cellGID = outgoingCellRequests[p][c];
          int cellLID = mesh().mapGIDToLID(0, cellGID);
          int dof = dofsFromProc[c];
          for (int i=0; i<nFuncs_; i++)
            {
              nodeDofs_[cellLID*nFuncs_ + i] = dof+i;
              addGhostIndex(dof+i);
            }
        }
    }
}