Wasn't it Hugo who wrote:
>As far as I know, "f_noise3d"  from "functions.inc" relies on the same
>formula as turbulence. I could be wrong though.

You can apply turbulence to a function pattern with "warp" (see
<http://www.econym.demon.co.uk/isotut/patterns.htm> but I don't know if
you can do it to non-pattern functions.

-- 
Mike Williams
Gentleman of Leisure

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