FEng3D was a simple 3D engine in Pygame I was developing. It started from a simple tutorial on rendering vertices, and then I began to look further into linear algebra for the first time. I looked into rotational matrices to create a "camera" system, and implemented my own depth and opaque rendering system. Even though I never quite finished it, and the lighting and shading is still unfinished, it was still a great learning experience I'd love to return to at some point if life brings me back here.