noise
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Incorrect names
Your Noise.gradientCoherentNoise3D
is actually Perlin noise and your Perlin noise is actually fBM noise. libnoise
made this mistake and since everyone else is either porting that library or copy/pasting from it this is a pretty widespread mix up.
https://en.wikipedia.org/wiki/Perlin_noise https://en.wikipedia.org/wiki/Fractional_Brownian_motion https://iquilezles.org/www/articles/fbm/fbm.htm