Hm. I had an idea for a game where you carve a spinning log of wood into a shape. Now, it turns out that a zillion people have already had this idea, which is fine, but I can't work out how they did it. I thought I'd render a log as a set of slices in Blender (see image), and rotate. But then there's 60 slices * 8 rotations * 20 diameters = 9600 images! https://www.dob5.com/games/395.html for example (screenshot below) works, and they don't have 10,000 PNGs. How's it doing it? Grrrr!
@sil browsers also fast enough now you don't need PNG, just do it real 3D
@sil I'm not clever enough to do either way! Have fun...