"Catseye" <jpf### [at] comcastnet> wrote in message 
news:484a89cb$1@news.povray.org...
> If I comprehend what you are saying about the method to color the edge (90 
> degrees from the face) of a solid triangle; however that's not what I 
> need. If possible I need to be able to generate a border around the 
> triangle face (visible looking at the face the face).
>

No that's not it. Using an object as a pigment colours everything outside 
the conceptual 'object' one colour and everything inside the conceptual 
'object' another colour. When such a pigment is applied to a surface you see 
the outline of the section of the shape as the real object 'cuts through' 
the pattern. In this case, if we slice the pattern at right angles we get a 
yellow triangle with a red border. Here's a complete example using the 
triangle object.

camera {location <0,2,-0.01> look_at 0}
light_source {   <-4,75 ,-10   >, rgb 1}

#declare PlaneIntersectionObject =  intersection {
  plane {z,0.2}
  plane {z,0.2 rotate 120*y}
  plane {z,0.2 rotate 240*y}
}

triangle {
  <0,0,-2*0.3>, vrotate(<0,0,-2*0.3>,y*120), vrotate(<0,0,-2*0.3>,y*240)
  pigment {
    object {
      PlaneIntersectionObject
      color rgb <1,0,0>  // Red Border
      color rgb <1,1,0>  // Yellow Triangle
    }
  }
}

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