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noise shaders

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GPU Gems 1&2 have Perlin noise shaders, and are available for free on the NVidia website. As I recall, the article in GPU Gems 1 is a cheap approximation, and the article in GPU Gems 2 is the real thing.

I have used the version from GPU Gems 2 in my project and it works nicely for layering several octaves of 4D noise together to create animated procedural lava. I haven't measured the performance though!

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