Sorry for the slow reply.

Tom Melly wrote:
> 
> Help please.
> 
> Can anyone suggest functions for:
> 
> A brain-like effect.

It's not an isosurface, but in <3B8E7BA0.8E2BDE71@my-deja.com> I gave
some patterns that look good from certain angles.  (Also used a similar
one on the Shortest Code Contest 2).  They were made with normals, so
they may not be useful for what you want.

Hope it helps.

-- 
Tom A.
When scientist say they're making a "quantum leap" it 
means they are going out to catch some rays.  - Dr. Science
Deja mail is gone.  Look for me at raugost at yahoo . com

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