Wasn't it ingo who wrote:
> Histograms of the different noise_generators, one with the granite 
>pigment, the other with pigment{function{f_noise3d}}. Images rendered 
>to gamma=1.
> Maybe usefull in the docs, section "6.7.12.4".
>
>Ingo
>

It certainly shows the problem with granite textures that have been
imported from v3.1.

If you have a granite with a colour_map that used to have a colour that
kicked in at values above 0.6 (e.g. the pinkness in Pink_Granite in
textures.inc", which kicks in at 0.8) that colour just isn't going to
appear any more unless you remember to switch back to the old
noise_generator.

-- 
Mike Williams
Gentleman of Leisure

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