[Paraview] Python programmable filter with two input ports and vtkCompositeDataSet

[Tobias Brandvik]

Hi,

I am following the instructions in this thread to create a Python
programmable filter with two input ports, both of which expect a
vtkCompositeDataSet:

https://public.kitware.com/pipermail/paraview/2016-July/037562.html

When I apply the filter I get the following error:

ERROR: In
/home/tbrandvik/Downloads/Paraview-5.4.1/VTK/Common/DataModel/vtkDataObjectTree.cxx,
line 297

vtkMultiBlockDataSet (0x190bd160): Structure does not match. You must use
CopyStructure before calling this method.


This is using Paraview 5.4.1. Any ideas on why this would work for multiple
vtkDataSet but not a multiple vtkCompositeDataSet as the inputs would be
welcome.

Cheers,
Tobias
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