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G FBM Noise
FBM stands for Fractional Brownian Motion, and FBM Noise is a key fractal noise that is used everywhere in 3D graphics, especially Renderman Shaders. This is my version of FBM Noise, and it allows you to select the usual parameters of Octaves, Lacunarity and Gain. G FBM Noise is supplied as both a generator and a filter.
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