Rotating 3d escher-knot by Oliver Nash /code/3d/systems/gsescher.zip	30 Jun 1998 (catalog date) 19,895 bytes
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The author says he appreciates a mention when you "steal" his formula, but "his" formula was already used on the amiga a long time ago. It might be useful downloading though if you're a starting 3d coder because the flatshaded 3d engine is very easy to understand. C