Method CopySubTree

Filters/Extraction/vtkExtractBlock.cxx:69–95

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void vtkExtractBlock::CopySubTree(vtkDataObjectTreeIterator* loc, vtkDataObjectTree* output,
  vtkDataObjectTree* input, vtkSet& activeIndices)
{
  vtkDataObject* inputNode = input->GetDataSet(loc);
  if (auto cinput = vtkDataObjectTree::SafeDownCast(inputNode))
  {
    auto coutput = vtkDataObjectTree::SafeDownCast(output->GetDataSet(loc));
    auto iter = cinput->NewIterator();
    for (iter->InitTraversal(); !iter->IsDoneWithTraversal(); iter->GoToNextItem())
    {
      auto curNode = iter->GetCurrentDataObject();
      auto clone = curNode->NewInstance();
      clone->ShallowCopy(curNode);
      coutput->SetDataSet(iter, clone);
      clone->FastDelete();
      activeIndices.erase(loc->GetCurrentFlatIndex() + iter->GetCurrentFlatIndex());
    }
    iter->Delete();
  }
  else if (inputNode)
  {
    vtkDataObject* clone = inputNode->NewInstance();
    clone->ShallowCopy(inputNode);
    output->SetDataSet(loc, clone);
    clone->FastDelete();
  }
}

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int vtkExtractBlock::RequestData(vtkInformation* vtkNotUsed(request),