Method RequestDataImpl

Filters/Extraction/vtkExtractGrid.cxx:162–208

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

//------------------------------------------------------------------------------
bool vtkExtractGrid::RequestDataImpl(
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  if ((this->SampleRate[0] < 1) || (this->SampleRate[1] < 1) || (this->SampleRate[2] < 1))
  {
    vtkErrorMacro("SampleRate must be >= 1 in all 3 dimensions!");
    return false;
  }

  // get the info objects
  vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation* outInfo = outputVector->GetInformationObject(0);

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

  if (input->GetNumberOfPoints() == 0)
  {
    return true;
  }

  vtkPointData* pd = input->GetPointData();
  vtkCellData* cd = input->GetCellData();
  vtkPointData* outPD = output->GetPointData();
  vtkCellData* outCD = output->GetCellData();

  vtkPoints* inPts = input->GetPoints();
  int* inExt = input->GetExtent();

  vtkPoints* newPts = inPts->NewInstance();
  int* outExt = output->GetExtent();

  vtkDebugMacro(<< "Extracting Grid");

  this->Internal->CopyPointsAndPointData(inExt, outExt, pd, inPts, outPD, newPts);
  output->SetPoints(newPts);
  newPts->Delete();

  this->Internal->CopyCellData(inExt, outExt, cd, outCD);

  this->CheckAbort();

  return true;
}

void vtkExtractGrid::PrintSelf(ostream& os, vtkIndent indent)
{