[Paraview] progress from internal filter

[Biddiscombe, John A.]

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Does relaying the internal filter's events not work?
>

That's exactly what I want, I just can't find an example that already does it to cut'n'paste from. I looked at contour filter etc because I know they use specialized internal filters, but I couldn't fin dsomewhere to copy from to save myself doing it from scratch.

JB
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