Coding a Rotating 3D Cube in C

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In this episode we define the 3D cube's sides (using points in 3D space), and then we render that cube to the screen using a very simple projection (plain projection, ignoring the depth coordinate). The result is a 2D-looking plain square that is actually a 3D cube in disguise.
Then, we animate the 3D cube and make it rotate! This requires some matrix multiplication with rotational matrices.