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For 3D terrain / volumes, SIMPLEX noise (Perlin 2001) was introduced primarily to address which weakness of classic Perlin noise?
ANeed for a large permutation table
BOutput range of [0, 1] always
CUse of floating-point math entirely
DDirectional artifacts visible on rotation
Answer & Solution
Correct answer: D. Directional artifacts visible on rotation
Perlin 2001 'Improving Noise' + 2002 simplex paper: simplex grid (triangular in 2D, tetrahedral in 3D) gives better isotropy + lower computational cost in nD.
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