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the linked article is wrong.

that, or http://webstaff.itn.liu.se/~stegu/simplexnoise/simplexnoise.... (from euccastro's comment below) is. but the latter looks more authoritative to me and checks against http://en.wikipedia.org/wiki/Perlin_noise.

perlin noise is gradient noise (so the gradient is chosen at random, not the height.




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