Greg,   Have you thought about donating your findings to the documentation
shipped with Pov-Ray ?   Bill P.

> I've been exploring the f_noise3d function to try to get a grasp for what's
> really different between noise_generators 2 and 3.   The following plot is
> the "mean particle diameter".  At low thresholds, it's self-explanatory.  At
> high tresholds, it's best understood as the "mean free path" in the material
> until you hit a "pore".
>
> Here, noise_generator 1 really splits from the pack.  You see the evidence
> of the "plateuas," in that for infitesimal differences from either 0 or 1
> you have a handful of particles.
>
>  [Image]

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