I learned 3d math and rendering from the textbooks of the time like Newman Sproul and Bruce Artwick books. and a lot of trial and error.

wrote my first 3d games on the bbc computer (1982-1983) and then got a Mac in 1984.. and did more 3d on the Mac. I started StarGlider on the Mac, written in 68000 code.. and then ported it to the Amiga and Atari ST when they came out. I had the first Amiga outside the USA.

https://www.amazon.co.uk/Principles-Interactive-Computer-Gra...

https://www.amazon.com/Applied-Concepts-Microcomputer-Graphi...