Warp wrote:
>   Another possibility, which I think few actually know, is to do something
> like this:
> 
> #declare IsoFunc =
>   function(x, y, z, a, b, c)
>   { max((y*y-1),(x*x-1),(z*z-1)) - pigmentFn(x+a,y+b,z+c).gray*0.75 };
> 
> isosurface { function { IsoFunc(x, y, z, 1, 2, 3) } }


Thanks Warp. I was one of the many.

~Sam

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