Bob Hughes wrote:
..
> I'd have to guess there could be trouble with the negative color used.

I've tracked it down to the average pattern. 

//This gives the expected caustics:
#macro urTex(Color)
      marble
      texture_map {
         [.5 pigment {color Color} ]
         [.5 pigment {color Color*.8} ]
      }
#end

//this doesn't:
#macro urTex(Color)
      average
      texture_map {
         [ pigment {color Color} ]
         [ pigment {color Color*.8} ]
      }
#end

plane{y,-sqrt(2) texture {urTex(<94,1,165>/255) }}

I can clean up the source and post it if anybody's interested.

sig

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