[Paraview] Using vtkIntegrateAttributes in an internal pipeline and multiple processes

[Vanmoer, Mark W]

Hi paraview,

I have a custom filter that takes two input connections and then uses vtkIntegrateAttributes on both to find the ratio of their volumes.  This is output as an unstructured grid, following the example of vtkIntegrateAttributes. The custom filter works fine in ParaView 4.0.1 when running as a single process. However, when I try to run on multiple processes, it crashes the pvserver with

=====================================================================================
=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
=   EXIT CODE: 139
=   CLEANING UP REMAINING PROCESSES
=   YOU CAN IGNORE THE BELOW CLEANUP MESSAGES
=====================================================================================
APPLICATION TERMINATED WITH THE EXIT STRING: Segmentation fault (signal 11)

while in the client terminal I get dozens of errors relating to broken pipes and not being able  to send or receive tags (which I take as a consequence of the pvserver crashing)

I see that vtkIntegrateAttributes uses vtkMultiProcessController. Should I be using this class and implementing a SetController?

Thanks,
Mark
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