Method RequestUpdateExtent

Filters/ParallelFlowPaths/vtkPStreamTracer.cxx:1406–1435

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

//------------------------------------------------------------------------------
int vtkPStreamTracer::RequestUpdateExtent(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  vtkInformation* outInfo = outputVector->GetInformationObject(0);
  int piece = outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_PIECE_NUMBER());
  int numPieces = outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_PIECES());
  int ghostLevel = outInfo->Get(vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_GHOST_LEVELS());

  int numInputs = this->GetNumberOfInputConnections(0);
  for (int idx = 0; idx < numInputs; ++idx)
  {
    vtkInformation* info = inputVector[0]->GetInformationObject(idx);
    if (info)
    {
      info->Set(vtkStreamingDemandDrivenPipeline::UPDATE_PIECE_NUMBER(), piece);
      info->Set(vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_PIECES(), numPieces);
      info->Set(vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_GHOST_LEVELS(), ghostLevel);
    }
  }

  vtkInformation* sourceInfo = inputVector[1]->GetInformationObject(0);
  if (sourceInfo)
  {
    sourceInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_PIECE_NUMBER(), 0);
    sourceInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_PIECES(), 1);
    sourceInfo->Set(vtkStreamingDemandDrivenPipeline::UPDATE_NUMBER_OF_GHOST_LEVELS(), ghostLevel);
  }

  return 1;
}

//------------------------------------------------------------------------------
int vtkPStreamTracer::RequestData(