Hello,
as I understand, OSG sorts the draw tree by material to minimize the state changes. This works perfectly for "normal" materials. I created a simple test scene with n objects and one material and get just one state change. But as soon as I and a shaderprogram chunk to the material, the statistics overlay reports n state changes with n = number of matrix changes. So it seems that there is a state change for every object even if only one material is used in the whole scene. Is that a bug? Cheers, Volker PS: using OpenSG2 on Win7, Nvidia 580
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