[vtkusers] Screenshot with VTK option offscreenrender on

[Darshan Pai]

I have a QT application and using a QVTkWidget for rendering VTK objects.
I recently compiled VTK with offscreen rendering on.

I was trying to take a screenshot of the QVTkWidget , using the
vtkWindowToImageFilter.
The problem is that it works on my machine, but the screenshot is empty
when trying it in another machine.

I found out that that if I use VTK without offscreen rendering it works.

Is there any way to solve this problem?

Regards
Darshan
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