Method RequestData

Filters/Extraction/vtkExtractGeometry.cxx:315–407

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//------------------------------------------------------------------------------
int vtkExtractGeometry::RequestData(
  vtkInformation* request, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  // get the input
  vtkDataSet* input = vtkDataSet::GetData(inputVector[0]->GetInformationObject(0));
  if (!input)
  {
    return 0;
  }
  if (input->GetNumberOfPoints() < 1)
  {
    return 1;
  }

  if (!this->GetExtractInside() && this->GetExtractOnlyBoundaryCells() &&
    this->GetExtractBoundaryCells() &&
    vtk3DLinearGridCrinkleExtractor::CanFullyProcessDataObject(input))
  {
    vtkNew<vtk3DLinearGridCrinkleExtractor> linear3DExtractor;
    linear3DExtractor->SetImplicitFunction(this->GetImplicitFunction());
    linear3DExtractor->SetCopyPointData(true);
    linear3DExtractor->SetCopyCellData(true);

    vtkNew<vtkEventForwarderCommand> progressForwarder;
    progressForwarder->SetTarget(this);
    linear3DExtractor->AddObserver(vtkCommand::ProgressEvent, progressForwarder);

    return linear3DExtractor->ProcessRequest(request, inputVector, outputVector);
  }

  vtkDebugMacro(<< "Extracting geometry");

  if (!this->ImplicitFunction)
  {
    vtkErrorMacro(<< "No implicit function specified");
    return 1;
  }

  const double multiplier = this->ExtractInside ? 1.0 : -1.0;

  vtkNew<vtkUnsignedCharArray> insidenessArray;
  vtkNew<vtkDoubleArray> scalarArray;
  // call that to guarantee thread safety
  this->ImplicitFunction->EvaluateFunction(0, 0, 0);
  using PointsDispatcher = vtkArrayDispatch::DispatchByArray<vtkArrayDispatch::AllPointArrays>;
  auto points = input->GetPoints()->GetData();
  if (!this->ExtractBoundaryCells)
  {
    EvaluatePointsInsidenessWorker worker;
    if (!PointsDispatcher::Execute(
          points, worker, this, this->ImplicitFunction, multiplier, insidenessArray.Get()))
    {
      worker(points, this, this->ImplicitFunction, multiplier, insidenessArray.Get());
    }
  }
  else
  {
    EvaluatePointsScalarsWorker worker;