Refreshing my memory (3d math)

So.. it's been a while since the last time I did all the 3D calculations myself. Nowadays I just use libraries since every decent graphics API have it build in, but that isn't the case for the GBA. I started implementing the functions needed for matrix transformations and quickly concluded with that I suspected before starting: a naive implementation will be way too slow. You still need the background information to start optimizing though. The following is a good starting point at least: Egon Rath's Notes: Basic 3D Math: Matrices.

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