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StasB

Random Gradients for Perlin Noise

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[url="https://github.com/ashima/webgl-noise/blob/master/src/classicnoise4D.glsl"]Something purely algorithmic like mod289[/url] is usually good enough for Perlin noise if you can't (or don't want to) afford a lookup texture.

A lookup texture can represent N dimensions by atlassing, see chapter 2.1 of Shader X7.

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