@cbuchner1 > Hmm, well I bet a lot of software relies on that feature...
I found threads by the Blender team who had to create workarounds because on some newer Geforce cards (4xx and 5xx series) suddenly the viewport update were orders of magnitude slower. http://blairwillems.com/2012/04/28/blender-improve-viewport-performance-on-geforce-4xx-5xx-cards/ http://projects.blender.org/tracker/index.php?func=detail&aid=29724&group_id=9&atid=498 Also this issue has been mentioned in the nvidia forums: https://devtalk.nvidia.com/default/topic/529615/opengl/two-sided-lighting-on-geforce-cards/ So, ideally you would turn the two sided lighting feature off for anything but the simplest geometries, and perform a two sided lighting in a fragment shader. Christian
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