In article <47cb5fa6$1@news.povray.org>, tim### [at] comcastnet says...
> The center's a bit off, but this should work if
> you don't cut it too deep.
> 
> #local A = <-1,0,0>;
> #local B = <1,0,0>;
> #local C = <0,sqrt(2),0>;
> #local D = <0,0,1>;
> #local RAD = 0.075;
> 
> #declare tetra = mesh {
>    triangle {A,B,C}
>    triangle {B,C,D}
>    triangle {C,D,A}
>    triangle {D,A,B}
>    inside_vector (A+B+C+D)/4
>    translate <0,0,-RAD>
> }
> 
> #declare octaside = union {
>     sphere {A,RAD}
>     sphere {B,RAD}
>     sphere {C,RAD}
>     cylinder {A,B,RAD}
>     cylinder {C,B,RAD}
>     cylinder {A,C,RAD}
>     object{tetra}
>     rotate <45,0,0>
>     translate <0,0,-1>
> };
> 
> #declare pyramid = union {
>    object {octaside}
>    object {octaside rotate <0,90,0>}
>    object {octaside rotate <0,180,0>}
>    object {octaside rotate <0,270,0>}
> };
> 
> #declare octagon = union {
>    object {pyramid}
>    object {pyramid rotate <180,0,0>}
> };
> 
Strictly speaking, the last version I posted was intended to be 100% 
solid, with ior for crystal. The version works fine, as a solid color, 
where I only plan to cut into the surface a bit to leave behind color. 
I.e., when I don't need 100% of it to be solid. The problem here is, I 
am not sure the result is what it *should* look like for a solid 
crystal. I threw together the scene rather quickly, so I don't know if 
the odd streaking is a result of the shape, the simple scene, or 
mistakes in my merges. :(

-- 
void main () {

    if version = "Vista" {
      call slow_by_half();
      call DRM_everything();
    }
    call functional_code();
  }
  else
    call crash_windows();
}

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