Whatever you end up doing, you want to avoid doing the equivalent of glReadPixels since that stalls the pipe and is relatively slow. I noticed that this was one of the suggestions in the link provided below...
-Shayne -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Ethan Fahy Sent: Wednesday, January 23, 2013 7:24 AM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] Most efficient way to get a single pixel RGBA froman FBO texture I should note that my needs are very similar to the ones described in this post: http://forum.openscenegraph.org/viewtopic.php?t=5941&highlight=glreadpix els I adapted the sample code given at the end of that thread and found that while I was able to retrieve the correct pixel values, I also was getting the: warning: detected OpenGL error 'invalid operation' at after RenderBin::draw() warning after every frame, regardless of whether my rtt camera was set to post render or pre render. Unfortunately that thread ended 2.5 years ago without a full resolution to the outstanding questions. ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=52096#52096 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
