>Revloving around a
>conical circle is not as simple as it sounds and I would
appreciate any
>tips you may have.


Isn't it possible to define a somewhat rotated 'slab of
shade' and then translating/rotating it around the y-axis?
Something like this:

#declare Slab=box { <0,0,-0.1> , <0.01,1,0.1> rotate
<0,0,20> translate <2,0,0>  texture {...} }

#declare Precision=1;
#declare T=0;
#declare SinCount=0;
#while (T<360)
object { Slab translate <sin(SinCount),0,0> rotate y*T}
#declare SinCount=Sincount+pi/(8*Precision);
#declare T=T+1/Precision;
#end

Haven't tested the code, but the idea should work...

Julius

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