[vtkusers] How to capture images from ONLY the RenderWindow?

[Jared Cohen]

  Hi all. I'm part of a team that's building a large, multi-window GUI; 
one of the windows contains the VTK RenderWindow. We implemented a 
function to save the scene as a PNG, but there's a problem: if any of 
the other windows are in the way of the RenderWindow, they get 
incorporated into the resulting PNG snapshot! What I want to do is take 
a snapshot of ONLY the contents of the RenderWindow, regardless of 
whether or not there are other windows in front of the RenderWindow. Is 
there a way to do this?
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