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Perlin noise is easier to repeat because it is rectangular in nature. Since simplex noise is triangular it requires a more complex solution using higher dimensional noise.
However you may notice that 2D simplex noise supports a "base" argument as well as x and y repeat intervals. This value offsets the periodic higher dimension used to tile the noise. This effectively "randomizes" the noise output without needing even higher dimensions of noise.
I noticed that perlin 3d has the ability to repeat, and simplex 2d as well; would it be possible to add simplex 3d repeating?
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