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This is now more or less at the stage I got the 3D engine at originally on the 48K Spectrum. Practically game ready. I never finished it. Though it was part of my portfolio that got me my first job at Software Creations.

The bug, by the way, was a schoolboy error. A stackframe imbalance caused by me incorrectly declaring a parameter type as uint8_t (a byte) rather than int_t (a word). The single byte difference caused the stack frame to move by one byte every time the function was called. Mucho crasho.

That's already done (in an earlier thread). Just need to get the filled triangles clipped. Then, get a decent model in. Getting a bit fed up staring at that old cube.