3D Tutorial by FH94.3 of Nitro /code/3d/docs/fh-3dtut.zip	18 Jan 1998 (catalog date) 12,903 bytes
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Explains how to rotate in 3D.

2D Rotation by Draeden of VLA /code/effects/3d/rotate.zip	25 Aug 1997 (catalog date) 7,790 bytes
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A clear explanation, but it doesn't explain how to do matrix rotation.

3D Rotation by Draeden of VLA /code/effects/3d/rotate3d.zip	25 Aug 1997 (catalog date) 35,866 bytes
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A clear explanation, but it doesn't explain how to do matrix rotation.

Rotozoomer by Paul H. Kahler /code/effects/rotozoom/rotatebm.zip	08 Jul 1997 (catalog date) 17,607 bytes
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The comments included with the code are very clear, so this one is great for starters.