[vtkusers] Ubuntu Unity settings can affect saved screen shots

[Bill Lorensen]

Folks,

I am running Ubuntu 14.04. I recently encountered some issues with
saving VTK render window images using vtrkWindowToImageFilter. I was
getting intermittent images that just contained an image of the
desktop and not the VTK image I expected.

It turns out I had "Window Animations" turned on. I set
Unity Tweak Tool->General->Animations->Off, and my WindowToImageFilter
screen shots are consistently as I expected.

Bill

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