> Below version afaik gives in 3.5 the same result as above:
> 
> #declare tau = (1+sqrt(5))/2;
> #declare F0 = function{pattern{marble}}
> #declare F1 = function{pattern{marble scale tau-1}}
> #declare taumarble = function{(F0(x,y,z)+F1(x,y,z))/2 }

In 3.1, "marble" without a color_map gave something strange.

-- 
Anton Sherwood  --  http://www.ogre.nu/

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