Method UnstructuredGridExecuteInternal

Filters/Geometry/vtkDataSetSurfaceFilter.cxx:1397–2288

======================================================================== Tris are now degenerate quads so we only need one hash table. We might want to change the method names from QuadHash to just Hash.

// Tris are now degenerate quads so we only need one hash table.
// We might want to change the method names from QuadHash to just Hash.
int vtkDataSetSurfaceFilter::UnstructuredGridExecuteInternal(
  vtkUnstructuredGridBase* input, vtkPolyData* output, bool handleSubdivision)
{
  vtkSmartPointer<vtkUnstructuredGrid> tempInput;
  if (handleSubdivision)
  {
    // Since this filter only properly subdivides 2D cells past
    // level 1, we convert 3D cells to 2D by using
    // vtkUnstructuredGridGeometryFilter.
    vtkNew<vtkUnstructuredGridGeometryFilter> uggf;
    vtkNew<vtkUnstructuredGrid> clone;
    clone->ShallowCopy(input);
    uggf->SetInputData(clone);
    uggf->SetPassThroughCellIds(this->PassThroughCellIds);
    uggf->SetOriginalCellIdsName(this->GetOriginalCellIdsName());
    uggf->SetPassThroughPointIds(this->PassThroughPointIds);
    uggf->SetMatchBoundariesIgnoringCellOrder(this->MatchBoundariesIgnoringCellOrder);
    uggf->SetOriginalPointIdsName(this->GetOriginalPointIdsName());
    uggf->DuplicateGhostCellClippingOff();
    uggf->SetContainerAlgorithm(this);
    // Disable point merging as it may prevent the correct visualization
    // of non-continuous attributes.
    uggf->MergingOff();
    uggf->Update();

    tempInput = vtkSmartPointer<vtkUnstructuredGrid>::New();
    tempInput->ShallowCopy(uggf->GetOutputDataObject(0));
    input = tempInput;

    if (this->CheckAbort())
    {
      return 1;
    }
  }

  vtkUnsignedCharArray* ghosts = input->GetPointGhostArray();
  vtkUnsignedCharArray* ghostCells = input->GetCellGhostArray();
  vtkCellArray* newVerts;
  vtkCellArray* newLines;
  vtkCellArray* newPolys;
  vtkPoints* newPts;
  int progressCount;
  vtkIdType i, j, k;
  int cellType;
  vtkIdType numPts = input->GetNumberOfPoints();
  vtkIdType numCells = input->GetNumberOfCells();
  vtkGenericCell* cell;
  vtkNew<vtkIdList> pointIdList;
  const vtkIdType* ids;
  vtkIdType numFacePts;
  vtkIdType inPtId, outPtId, numCellPts;
  vtkPointData* inputPD = input->GetPointData();
  vtkCellData* inputCD = input->GetCellData();
  vtkFieldData* inputFD = input->GetFieldData();
  vtkCellData* cd = input->GetCellData();
  vtkPointData* outputPD = output->GetPointData();
  vtkCellData* outputCD = output->GetCellData();
  vtkFieldData* outputFD = output->GetFieldData();