Method CopyCells

Filters/General/vtkBooleanOperationPolyDataFilter.cxx:254–343

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//------------------------------------------------------------------------------
void vtkBooleanOperationPolyDataFilter ::CopyCells(vtkPolyData* in, vtkPolyData* out, int idx,
  vtkDataSetAttributes::FieldList& pointFieldList, vtkDataSetAttributes::FieldList& cellFieldList,
  vtkIdList* cellIds, bool reverseCells)
{
  // Largely copied from vtkPolyData::CopyCells, but modified to
  // use the special form of CopyData that uses a field list to
  // determine which data values to copy over.

  vtkPointData* outPD = out->GetPointData();
  vtkCellData* outCD = out->GetCellData();

  vtkFloatArray* outNormals = nullptr;
  if (reverseCells)
  {
    outNormals = vtkArrayDownCast<vtkFloatArray>(outPD->GetArray("Normals"));
  }

  vtkIdType numPts = in->GetNumberOfPoints();

  if (out->GetPoints() == nullptr)
  {
    vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
    out->SetPoints(points);
  }

  vtkPoints* newPoints = out->GetPoints();

  vtkSmartPointer<vtkIdList> pointMap = vtkSmartPointer<vtkIdList>::New();
  pointMap->SetNumberOfIds(numPts);
  for (vtkIdType i = 0; i < numPts; i++)
  {
    pointMap->SetId(i, -1);
  }

  // Filter the cells
  vtkSmartPointer<vtkGenericCell> cell = vtkSmartPointer<vtkGenericCell>::New();
  vtkSmartPointer<vtkIdList> newCellPts = vtkSmartPointer<vtkIdList>::New();
  for (vtkIdType cellId = 0; cellId < cellIds->GetNumberOfIds(); cellId++)
  {
    if (this->CheckAbort())
    {
      break;
    }
    in->GetCell(cellIds->GetId(cellId), cell);
    vtkIdList* cellPts = cell->GetPointIds();
    vtkIdType numCellPts = cell->GetNumberOfPoints();

    for (vtkIdType i = 0; i < numCellPts; i++)
    {
      vtkIdType ptId = cellPts->GetId(i);
      vtkIdType newId = pointMap->GetId(ptId);
      if (newId < 0)
      {
        double x[3];
        in->GetPoint(ptId, x);
        newId = newPoints->InsertNextPoint(x);
        pointMap->SetId(ptId, newId);
        outPD->CopyData(pointFieldList, in->GetPointData(), idx, ptId, newId);