Question on Programmable Filter using vtkPythonAlgorithmBase

ParaView Support
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1

Hi, I have read many post from others earlier and it helped me a lot. I have a question that probably hasn’t asked earlier.

I am using separate python script using vtkPythonAlgorithmBase and loading it through Manage Plugins menu, then using it as a filter on my dataset.

Within script, I am creating vtkStreamTracer and getting it’s output, storing it in vtkPolyData object. It’s works perfectly.

I have couple of questions:

  1. How do I change ‘Display’ properties such as LineWidth of the output object in Paraview pipeline from script only? I have tried using functions from paraview.simple within RequestData() function of the script. Unfortunately it goes into infinite recursion where RequestData() calls itself, probably because some functions updates/accesses pipeline objects. I have made a macro to style my Stream Lines after I apply this filter. But I want it to be done within one step: creation of final output Stream Lines and styling of it.
  2. Is some of the functions aren’t available in vtkPythonAlgorithm? Like vtkProgrammableFilter is available but not vtkPythonProgrammableFilter.
2

You cannot modify the visualization from inside a filter:

  • a plugin defines the filter contents
  • a macro uses the filter and defines the display.

To have a one-step workflow, you can have a macro that creates your filter and configures its display.

3

Oh, I see. Thanks.