Hi, I have some solid geometry clipped by some clipping planes in an OSG application. I am trying to use the capping technique described in chapter 10 of the Red Book using the stencil buffer. I have successfully implemented this technique in raw OpenGL, but I would like to use it whithin the OSG application. The technique is based on storing on the stencil buffer the regions that are "open" and then in a later pass draw a solid color in these regions.
I have put the clipped geometry under an osg::Camera node with the stencil function configured. To do the second pass (the one that draws the caps in the regions marked in the stencil), I am trying to use a post-draw callback with the OpenGL calls (saving and restoring the states to avoid breaking things). The problem is that I need to set the NESTED rendering order to see all the scene graph, and when I do it, the post-draw callback is not called anymore. I do not have full control over the application, so the solution I am looking for has to be "transparent" to the rest of the scene graph. I must activate this behaviour to a group in the scene graph without breaking anything outside this branch. What is the best way to do it? camera post-draw callbacks? rendering bins? any other? I am not very familiar with render passes in OSG, so the way I am trying is probably not the best way. I would appreciate any suggestion, advice or pointer to any related documentation or source code. Thanks in advance. Javier Taibo.
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