[Paraview] PVPython where is PiecewiseFunction

[Kevin H. Hobbs]

I'm trying to make a ParaView python script to do some volume rendering.

I can load my data, set the representation to volume rendering, and set
the color scale the way I want, but I can't figure out how to set the
opacity.

I found rep.ScalarOpacityFunction, but what do I set it to?

I created a simple ParaView session with a volume rendering. Poking
around there I found that there is a PiecewiseFunction that I think is
created.

How do I make a PiecewiseFunction?
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