> How about using pigment functions and the 'max()' function?
> 
> Something like:
> 
> #declare fn_1=function { pigment { ... } }
> #declare fn_2=function { pigment { ... } }
> 
> #declare fn_hf=function { max(fn_1(x, y, z), fn_2(x, y, z)) }

  Yes! That's it! I was just trying with the pigment function, but I
would have expended much more time to figure out this one, wich is
perhaps the only way to get it working. Thanks!

-- 
Jaime Vives Piqueres

La Persistencia de la Ignorancia
http://www.ignorancia.org/

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