Hi,<br><br>I'm working on a GPU-accelerated multi-volume raycaster (based on vtkVolumeMapper). In my algorithm I use multiple render passes while rendering to offscreen buffers (using openGL framebuffer extension). However, if I wish to combine this mapper with a default vtkPolyDataMapper however (to render some other actors in the scene), I never get to see the result of the polydata mapper because inside my multi-volume mapper I take over the whole screen, doing glClear() and things like that. Is there a way to do multiple render passes in a way such that other mappers can still work?<br>
<br>I hope this question is not too vague :)<br><br>Greetz,<br><br>Ralph<br><br>