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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi all,<o:p></o:p></p><p class=MsoNormal>I would like to be able to render a 3D volume and grab the 2D image that will be displayed when rendering is complete (i.e. for each frame when rotating the volume). I think that I can do this using vtkWindowToImageFilter, although I’m not sure how to get the image at the right step or event (i.e. before it gets displayed on screen in some render window event). Then I’d like to manipulate that data with a lookup table and place the result back into the buffer and then render the image to the display. How do I place the data back into the render window buffer for display? I’ve tried using the Z buffer, but truthfully I don’t really understand what a Z buffer is, and I couldn’t get that to work. Can anyone help?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Sean<o:p></o:p></p></div></body></html>