> The only benefit this has over its contemporaries is that it is tileable. Although, it does repeat making this benefit useless considering that Perlin and Simplex noise are non-repeating and infinite. Perlin and Simplex are also easily tileable too. Just make your hash function periodic and the resulting noise while tile at the same period. This is a neat article and a neat technique, but probably not super practic…
>> Taking the FFT, modifying frequency amplitudes