Type-in from the October 1988 issus of CPC Computing magazine, the program is Listed at end of video.
From the magazine (courtesy of CPCRulez):
"HERE'S a simple - but clever -graphics routine which draws a 3D donut. It's quite easy to amend some of the values to produce different sizes and textures."
https://www.dailymotion.com/video/x8lj8la