FYI -- See this same thread in osg-submissions for my recent addition of support for the EXT_draw_instanced extension. As stated in the extension spec at opengl.org, this extension adds two new vertex array drawing commands and a new shader variable gl_InstanceID. The OSG submission exposes the two drawing commands as five new PrimitiveSet types. Adding a shader and referencing the gl_InstanceID is the responsibility of the application. In my work with this extension, I've found it can dramatically reduce cull and draw times. It also reduces GPU time in some particularly bad corner cases. So, the extension is quite useful at increasing efficiency for apps that need to render the same object multiple times. Enjoy, Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com <http://www.skew-matrix.com/> +1 303 859 9466
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