Quote:
Originally Posted by Lepton
This is a single grid rotating but your vision will detect 5-6 independent rotations.
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Hmmm, I am not to good at explaining this kind of stuff, but I'll try: The darker and lighter areas is kind of a moire phenomena, I made an image that I'll append to this post. It consists of three frames combined, and shows the moire effect quite well.
The apparant rotation looks like a temporal aliasing effect, the angular change of the lines becomes higher than the sampling rate of the animation, so you get some areas where there is little difference between each frame, while other parts have more movement. These overlap with the moire effects, and you get the apparently quiet areas framed by more noisy areas, and a reinforcement of the apparent rotation.
Of course, one should expect strange things to happen when one tries to move a rectangular grid in a circular coordinate system that is simulated on a display unit that uses a rectangular coordinate system.
