[vtk-developers] filter within a filter

[Vanmoer, Mark W]

Hello, I'm trying to use a filter from within another filter. I found this discussion

http://www.vtk.org/pipermail/vtk-developers/2012-February/010946.html

that says "The only real trick is that you have to ShallowCopy the outer filter's input into the first filter in the internal pipeline and ShallowCopy the last filter's output into the outer filter's output."

I had been starting the internal pipeline by passing the data set I grab out of the information object into a trivial producer, but vtkTrivialProducer doesn't have ShallowCopy.

Am I understanding what "outer filter's input" is correctly?

vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);

// This is the outer filter's input, correct?
vtkDataSet *input = vtkDataSet::SafeDownCast(
  inInfo->Get(vtkDataObject::DATA_OBJECT()));

// tp is a vtkTrivialProducer ivar, but should I be ShallowCopying before SetOutput()?
tp->SetOutput(input);

Thanks,
Mark
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