[vtkusers] How to draw the scene in the off-screen?

[liu jianfei]

Dear all

    I'm using 'vtkrenderwindow' to hold and display all renders, and
grabbing z-buffer and frame buffer from it. But I want to put all these
processing in off-screen rather than display them directly. How can I
implement it? Thanks.

-- 
Sincerely
Jianfei Liu
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