Source: MSX Mailinglist
Slotman has found a japanese utility called Magical Producer IV that enables you to model 3D graphics on your MSX computer. To make it even more interesting, there also is a stripped BASIC 3D-modeller. Yes, you read it right the first time. A 3D-modeller programmed in BASIC. ON the site you will also find a game (SSW) that uses graphics created with Magical Producer IV. More than enough reasons to check it all out. Klick the 'Software for MSX' link in the website and enjoy. By the way: Sometimes the link does not seem to work correctly, just retry it and the site will load.
Relevant link: http://www.vega.or.jp/~tanaka/hiroshi/