Hi Robert -- Why is Camera::DrawCallback::operator() declared as const? Is this simply a result of the draw operation itself being entirely const? I have my own structs derived from Camera::DrawCallback, and in operator() I'd like to modify some member variables. The fact that operator() is const is forcing me to make those mutable or cast away constness. I'm using these as PreDraw and PostDrawCallbacks, and from what I can see of the code, those are always executed sequentially by the same thread, so I don't see that there's risk of thread collisions if I modify data in my callbacks. Correct me if I'm wrong on this. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com <http://www.skew-matrix.com/> 303 859 9466
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