Method RequestData

Filters/Geometry/vtkDataSetRegionSurfaceFilter.cxx:96–147

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//------------------------------------------------------------------------------
int vtkDataSetRegionSurfaceFilter::RequestData(
  vtkInformation* request, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  vtkUnstructuredGrid* input = vtkUnstructuredGrid::GetData(inputVector[0], 0);

  if (!input)
  {
    vtkErrorMacro("Input not specified!");
    return 0;
  }

  if (this->RegionArrayName)
  {
    this->RegionArray =
      vtkIntArray::SafeDownCast(input->GetCellData()->GetArray(this->RegionArrayName));
  }

  // assume all tets, and that the tets are small relative to the size of the
  // regions (absolute max number of faces in output would be
  // input->GetNumberOfCells() * 4)
  this->OrigCellIds->Reset();
  this->OrigCellIds->Allocate(input->GetNumberOfCells());
  this->CellFaceIds->Reset();
  this->CellFaceIds->Allocate(input->GetNumberOfCells());

  this->Superclass::RequestData(request, inputVector, outputVector);

  // if any tets, then we'll have CellFaceIds... assume all tets and that we
  // want to addthe cell data
  if (this->CellFaceIds->GetNumberOfTuples() > 0)
  {
    vtkPolyData* output = vtkPolyData::GetData(outputVector, 0);
    if (output->GetNumberOfCells() != this->CellFaceIds->GetNumberOfTuples())
    {
      vtkErrorMacro("Unable to add CellData because wrong # of values!");
    }
    else
    {
      output->GetCellData()->AddArray(this->OrigCellIds);
      output->GetCellData()->AddArray(this->CellFaceIds);
    }
  }
  else
  { // get rid of point mapping information
    vtkPolyData* output = vtkPolyData::GetData(outputVector, 0);
    output->GetPointData()->RemoveArray("vtkOriginalPointIds");
  }

  this->CheckAbort();

  return 1;
}

//------------------------------------------------------------------------------
int vtkDataSetRegionSurfaceFilter::UnstructuredGridExecute(