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The reason I ask is that I’ve written a rendering scheme for a 2d top down game that uses ortho projection. To give the appearance of depth I scale the objects. I’m wondering if switching to frustum and using the z-coor in lieu of scaling will improve performance. I would just implement it and find out, but it would take me several hours, and its easier to just ask here.
glScalejust simply modifies the matrix on top of the stack, all done in CPU. As for expensive “relatively speaking”, I guess I ask – relative to what? 🙂 It’s not that expensive if you are doing it occasionally. If you are doing it in a critical inner loop, then, yeah, it could be expensive.