Tom York wrote:
> I'm looking for an optimisation. I've used material_map in the past to
> control finish properties like reflectivity, specular properties and so on.
> Based on a procedure posted some time ago on this news group (in 2000, I
> think) I do something like
> 
> texture {
>   material_map {
>     tga "specular_map.tga"
>     #declare Count = 1;
>     #while (Count <= 255)
>       texture {
>         pigment { rgb 1 }
>         finish {
>           specular (Count/255)
>         }
>       }
>       #local Count = Count + 1;
>     #end
>   }
> }

How about:

texture {
   image_pattern {
     tga "specular_map.tga"
   }
   texture_map {
     [ 0
       pigment { rgb 1 }
       finish {
         specular 0
       }
     ]
     [ 1
       pigment { rgb 1 }
       finish {
         specular 1
       }
     ]
   }
}

Also note you don't need to use a paletted image for this - grayscale 
will work fine as well (even 16 bit).

Christoph

-- 
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HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 03 May. 2005 _____./\/^>_*_<^\/\.______

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