Hi all, I'm fairly new to osg and graphics programming in general, so please bear with me :)
I am looking to retrieve the pixels from my scene after everything (except the post processing/overlay stuff) has been rendered. I need to get this every frame to perform some simple image analysis of the scene which then will effect how the final frame is displayed. The main catch is I need this to be fast so that I don't take any major performance hits. I plan to use a PostDrawCallback, but does the FBO allow me to avoid calling glReadPixels or speed it up at all? If so how do I set it up to do so? Or are there any other ways to avoid copying to main mem? Also, after the PostDrawCallback is it possible to still use a frag shader to modify the scene after I perform my analysis, or do I have to modify the pixels in my callback function? Any suggestions or advice is greatly appreciated. Thanks ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44151#44151 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
