Though he has put out one demo for the C64, he has published pictures and videos showing the power of 3Dvibe64, a 3-D engine. There is a version called 2.5vibe128 . For more information, pictures, and PDF's, see
https://www.retromind.it/blog/3dvibe64-gouraud-textures-and-raycasting-in-commodores-8-bit-world/
Truly,
Robert Bernardo
Fresno Commodore User Group - http://www.dickestel.com/fcug.htm
Southern California Commodore & Amiga Network - http://www.portcommodore.com/sccan