[vtkusers] OpenGL2 Backend and vtkImageProcessingPass

[eternallite2]

In a previous version of VTK (6.1.0), with the old OpenGL backend
we were able to do multi-pass rendering and there were examples of
how to do custom post-processing effects (like blurring, sobel edge
detection, etc.)

With OpenGL2 backend, is it possible to do these effects using FBOs? (If so, 
are there any examples yet of how to do this)

Thanks for the help :)




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