[vtkusers] vtkRenderWindow off-screen rendering

[michalgallovic]

Hey guys, 

I would like to do off-screen rendering of vtkRenderWindow into the frame
buffer object. 

I'm not sure how to do so, but what I think is that: 

1.generate frame buffer using glGenFramebuffers - obtain GLuint fbo_id 
2.create vtkFrameBufferObject from vtkRendererWindow (I don't know how to do
so) 
3.call SetActiveBuffer(fbo_id) on vtkFrameBufferObject 
4.call RenderQuad on vtkFrameBufferObject -> now the created FBO should be
filled with data. 

My question is - how can I create vtkFrameBufferObject with the contents of
my window, so I can do the off-screen rendering into the FBO ? Should this
be done as I stated above ? 

Thanks




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