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OK, I posted this the other day, but I chose a subject line that had
(predictably) already been used, and thus my picture ended up way back
in the history. But it's nice and small, so I hope you don't mind me
posting again...
For those that wanted the source, it's below. The icosohedron was
produced with a program called Dome by Richard J Bono, and the
dodecahedron is lifted from one of Warp's posts. Unfortunately they
didn't match up nicely, so the rotation is done by eye, and the crystal
is not perfectly symmetrical as a result.
#global_settings {max_trace_level 25 photons {count 50000}}
#declare Icosohedron=mesh {
triangle{<0,0,1>,<0.894427,0,0.447214>,<0.276393,0.850651,0.447214>}
triangle{<0,0,1>,<0.276393,0.850651,0.447214>,<-0.723607,0.525731,0.4472
14>}
triangle{<0,0,1>,<-0.723607,0.525731,0.447214>,<-0.723607,-0.525731,0.44
7214>}
triangle{<0,0,1>,<-0.723607,-0.525731,0.447214>,<0.276393,-0.850651,0.44
7214>}
triangle{<0,0,1>,<0.276393,-0.850651,0.447214>,<0.894427,0,0.447214>}
triangle{<0.723607,0.525731,-0.447214>,<0.276393,0.850651,0.447214>,<0.8
94427,0,0.447214>}
triangle{<-0.276393,0.850651,-0.447214>,<-0.723607,0.525731,0.447214>,<0
.276393,0.850651,0.447214>}
triangle{<-0.894427,0,-0.447214>,<-0.723607,-0.525731,0.447214>,<-0.7236
07,0.525731,0.447214>}
triangle{<-0.276393,-0.850651,-0.447214>,<0.276393,-0.850651,0.447214>,<
-0.723607,-0.525731,0.447214>}
triangle{<0.723607,-0.525731,-0.447214>,<0.894427,0,0.447214>,<0.276393,
-0.850651,0.447214>}
triangle{<0.276393,0.850651,0.447214>,<-0.276393,0.850651,-0.447214>,<0.
723607,0.525731,-0.447214>}
triangle{<-0.723607,0.525731,0.447214>,<-0.894427,0,-0.447214>,<-0.27639
3,0.850651,-0.447214>}
triangle{<-0.723607,-0.525731,0.447214>,<-0.276393,-0.850651,-0.447214>,
<-0.894427,0,-0.447214>}
triangle{<0.276393,-0.850651,0.447214>,<0.723607,-0.525731,-0.447214>,<-
0.276393,-0.850651,-0.447214>}
triangle{<0.894427,0,0.447214>,<0.723607,0.525731,-0.447214>,<0.723607,-
0.525731,-0.447214>}
triangle{<0,0,-1>,<0.723607,0.525731,-0.447214>,<-0.276393,0.850651,-0.4
47214>}
triangle{<0,0,-1>,<-0.276393,0.850651,-0.447214>,<-0.894427,0,-0.447214>
}
triangle{<0,0,-1>,<-0.894427,0,-0.447214>,<-0.276393,-0.850651,-0.447214
>}
triangle{<0,0,-1>,<-0.276393,-0.850651,-0.447214>,<0.723607,-0.525731,-0
.447214>}
triangle{<0,0,-1>,<0.723607,-0.525731,-0.447214>,<0.723607,0.525731,-0.4
47214>}
scale 1.088 rotate <45,-22.5,-22.5>
}
#local p=(1+sqrt(5))/2; // the Golden ratio
#local p2=pow(p,2);
#local p3=pow(p,3);
#local
Vert=array[20]{<0,p,p3>,<0,-p,p3>,<p2,p2,p2>,<-p2,p2,p2>,<-p2,-p2,p2>,<p
2,-p2,p2>,<p3,0,p>,<-p3,0,p>,<p,p3,0>,<-p,p3,0>,<-p,-p3,0>,<p,-p3,0>,<p3
,0,-p>,<-p3,0,-p>,<p2,p2,-p2>,<-p2,p2,-p2>,<-p2,-p2,-p2>,<p2,-p2,-p2>,<0
,p,-p3>,<0,-p,-p3>}
#local
TInd=array[36]{<0,1,3><1,3,7><1,7,4><0,2,8><0,8,9><0,9,3><2,6,12><2,12,1
4><2,14,8><3,7,13><3,13,15><3,15,9><0,1,5><0,5,6><0,6,2><1,5,11><1,11,10
><1,10,4><7,13,16><7,16,10><7,10,4><9,8,14><9,14,18><9,18,15><5,6,12><5,
12,17><5,17,11><12,14,18><12,18,19><12,19,17><10,11,17><10,17,19><10,19,
16><13,15,18><13,18,19><13,19,16>}
#declare Dodecahedron=mesh{
#local Len=vlength(Vert[0]);
#local I=0;
#while(I<36)
triangle{Vert[TInd[I].x]/Len,
Vert[TInd[I].y]/Len,Vert[TInd[I].z]/Len}
#local I=I+1;
#end
inside_vector y
rotate<31.75,0,0>
}
#declare Jewel=merge {object {Dodecahedron} object {Icosohedron}
bounded_by {sphere {<0,0,0>,1.09}}}
#declare Crystal=material {texture {pigment {color
rgbf<0.98,0.98,0.98,0.9>} finish {ambient 0.1 diffuse 0.1 specular 0.8
roughness 0.003 phong 1 phong_size 400 reflection 0.15 conserve_energy}}
interior {ior 1.5 dispersion 1.1 dispersion_samples 100}}
light_source {<10,10,15> color rgb<1,1,1> area_light <1,0,0>,<0,1,0>,3,3
adaptive 1 jitter circular orient photons {refraction on reflection on
area_light}}
camera {location <2,2,-5> look_at <0,0,0>}
object {Jewel material {Crystal} translate <0,1.088,0> photons {target
reflection on refraction on collect off}}
box {<-20,0,-20>,<20,20,20> pigment {bozo color_map {[0 color
rgb<0.4,0.4,0.4>] [0.25 color rgb<0.4,0.45,0.5>] [0.5 color
rgb<0.5,0.5,0.5>] [0.75 color rgb<0.5,0.45,0.4>] [1 color
rgb<0.4,0.4,0.4>]} turbulence 0.2 scale 4} hollow}
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com> wrote: