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i recently implemented refraction (for the first time), and in making the index of refraction vary with wavelength i decided to hack a bit. normally the index of refraction decreases with wavelength, so of course i made it increase 
this was producing really interesting caustics already, so i put the scene inside a big reflecting ring, which is what causes the nice "dream catcher" like crossing of caustics.
this was producing really interesting caustics already, so i put the scene inside a big reflecting ring, which is what causes the nice "dream catcher" like crossing of caustics.
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I love this so much. I think you've moved on to fractal stuff now, and I love that as well, but I wish the program you used to make this was available to buy! I would do anything to be able to play around with the settings of a ray tracing program that allowed you to alter the details of the behavior of light.