Method RequestData

Filters/Geometry/vtkDataSetSurfaceFilter.cxx:382–491

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
int vtkDataSetSurfaceFilter::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // get the info objects
  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation* outInfo = outputVector->GetInformationObject(0);

  // get the input and output
  vtkDataSet* input = vtkDataSet::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkPolyData* output = vtkPolyData::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkIdType numCells = input->GetNumberOfCells();
  int wholeExt[6] = { 0, -1, 0, -1, 0, -1 };
  if (input->CheckAttributes())
  {
    return 1;
  }

  if (numCells == 0)
  {
    vtkDebugMacro(<< "Number of cells is zero, no data to process.");
    return 1;
  }

  if (input->GetExtentType() == VTK_3D_EXTENT)
  {
    const int* wholeExt32;
    wholeExt32 = inInfo->Get(vtkStreamingDemandDrivenPipeline::WHOLE_EXTENT());
    std::copy(wholeExt32, wholeExt32 + 6, wholeExt);
  }

  switch (input->GetDataObjectType())
  {
    case VTK_UNSTRUCTURED_GRID:
    case VTK_UNSTRUCTURED_GRID_BASE:
    {
      this->UnstructuredGridExecute(input, output);
      output->CheckAttributes();
      return 1;
    }
    case VTK_RECTILINEAR_GRID:
    {
      auto rg = vtkRectilinearGrid::SafeDownCast(input);
      return this->StructuredExecute(input, output, rg->GetExtent(), wholeExt);
    }
    case VTK_STRUCTURED_GRID:
    {
      auto sg = vtkStructuredGrid::SafeDownCast(input);
      return this->StructuredExecute(input, output, sg->GetExtent(), wholeExt);
    }
    case VTK_UNIFORM_GRID:
    case VTK_STRUCTURED_POINTS:
    case VTK_IMAGE_DATA:
    {
      auto img = vtkImageData::SafeDownCast(input);
      return this->StructuredExecute(input, output, img->GetExtent(), wholeExt);
    }
    case VTK_POLY_DATA: