Bill DeWitt wrote:
> 
> I can't think of a way to make an object have the inverse color of the
> objects behind it. Is there a way?
> 
> I was thinking that it would be something like a filter that had a negative
> value, but that didn't work of course...

pigment{ rgbf <1,1,1,-1> }
finish{ ambient 0.5 }  // this value threw me 

Cheers, PoD.

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