Mark Wagner <mar### [at] gtenet> wrote:
> Depends on the surface, but in general, iii) give haphazard results

  If that would be true, then any surface with reflections or refractions
would look wrong.
  The reflected/refracted rays start exactly from the surface of the object.
(Internally there's an epsilon value added to the start point of the ray
to avoid problems, and I suppose that trace() works in the exact same way.)

-- 
#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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