Timothy R. Cook <tim### [at] scifi-fantasycom> wrote:
> But the light (if we're talking about a point light) is a known
> single point!  It's easy to test if it's on the surface!

  No, it isn't.
  You can test wether a point is inside or outside the object, but you
can't test if it's exactly on the surface.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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