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<DIV>I am using ray casting to render a volume on the screen, but I
also need the</DIV>
<DIV>projection image for my image processing routines. </DIV>
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<DIV>Is there a way to get the 2D projection image that is rendered on the
screen?</DIV>
<DIV>I looked at vtkWindowToImageFilter, but it won't work in my case
because</DIV>
<DIV>I have 4 renders added to the same window. </DIV>
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