[vtkusers] Render Artifacts

[Slaughter, Andrew E]

I am seeing some rendering artifacts and can't figure out the cause, I
would appreciate any help trying to get rid of them.

If you run the script attached it will produce "before.png", which shows
the artifacts well. If you move the mouse at all in the interactive window
the artifacts go away and things look great ("after.png").

I am using MacOS 10.12.6, VTK7.1, and python 2.7. I can't share the exact
input file and I am unable to reproduce it on a smaller file.

Thanks,

Andrew
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