This is my first success with my visibility pattern. It is supposed to 
be copper or a copper alloy with a patina on it, worn away in exposed 
areas. The syntax is simple, this is the code that produced this image:


#declare TestObj=
union {
   box {<-5,-1,-5>, < 5, 0, 5>}
   cylinder {< -2, 0, 0>, <-1, 3, 0>, 1}
   cylinder {< 0, 0, 0>, <-1, 3, 0>, 1}
   difference {
      sphere {< 1, 1, 0>, 1}
      cone {< 1, 1, 0>, 0, < 1, 1.75,-1>, 0.65}
   }
}
object {TestObj
   texture {
      pigment {color rgb < 0.6, 0.45, 0>}
      finish {
         reflection 0.35
         reflect_metallic
         metallic
         ambient 0 diffuse 0.6
      }
   }
   texture {
      pigment {visibility 200, object {TestObj}
//visibility SAMPLES, TARGET_OBJECT
         color_map {
            [0 color rgb < 0.15, 1, 0.75>]
            [0.1 color rgb < 0.15, 1, 0.75>]
            [0.6 color White transmit 1]
            [1 color White transmit 1]
         }
      }
   }
}

Time For Trace:    0 hours 11 minutes  26.0 seconds (686 seconds)
On a PowerPC G3 at 266MHz.
I had to make the object be specified as a parameter, otherwise it 
didn't work with CSG objects. I am not sure why, though. And a possible 
problem with this syntax: although it gives you more control over the 
objects that affect the pattern, you can't just define a texture and 
have it work for all objects. :-(

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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