>   Has anyone fixed or is planning on fixing the grid in noise artifact?

May be this paper can help :
http://mrl.nyu.edu/perlin/paper445.pdf

"The original algorithm, although efficient, suffered from two defects: second
order discontinuity across coordinate-aligned integer boundaries, and a
needlessly expensive and somewhat problematic method of computing the
gradient. We (belatedly) remove these defects."

M

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