Method RequestData

Filters/Generic/vtkGenericStreamTracer.cxx:546–584

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

//------------------------------------------------------------------------------
int vtkGenericStreamTracer::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
  vtkGenericDataSet* input =
    vtkGenericDataSet::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkPolyData* output = vtkPolyData::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkDataArray* seeds = nullptr;
  vtkIdList* seedIds = nullptr;
  vtkIntArray* integrationDirections = nullptr;
  this->InitializeSeeds(seeds, seedIds, integrationDirections);

  if (seeds)
  {
    double lastPoint[3];
    vtkGenericInterpolatedVelocityField* func;
    if (this->CheckInputs(func, inputVector) != VTK_OK)
    {
      vtkDebugMacro("No appropriate inputs have been found. Can not execute.");
      func->Delete();
      seeds->Delete();
      integrationDirections->Delete();
      seedIds->Delete();
      return 1;
    }
    this->Integrate(input, output, seeds, seedIds, integrationDirections, lastPoint, func);
    func->Delete();
    seeds->Delete();
  }

  integrationDirections->Delete();
  seedIds->Delete();
  return 1;
}

//------------------------------------------------------------------------------
int vtkGenericStreamTracer::CheckInputs(