* 2D OpenSimplex2S/SuperSimplex noise, with Y pointing down the main diagonal. * Might be better for a 2D sandbox style game, where Y is vertical. * Probably slightly less optimal for heightmaps or continent maps, * unless your map is centered around an equator. It's a slight * difference, but the option is here to make it easy. */
(long seed, double x, double y)
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