Small 3D engine for Amiga A1200 tech demo (Spyro The Dragon)

Here's another demo of the engine: https://www.youtube.com/watch?v=gcpFkSGuDPM

Here's some explanation: https://eab.abime.net/showthread.php?t=113573

And here's the source: https://github.com/Rst7CBSIE/SDDDE