Micha Riser <mri### [at] gmxnet> wrote:
> If the ray does not get refracted you do not need to shoot a new ray and 
> can just pass along to the ray's next intersection.

  But how do you get the "ray's next intersection" without shooting a new
ray in the same direction as the original ray, starting from the first
intersection point?

  Besides, how does the engine decide that the surface is completely
invisible?
  And even if we had a "completely invisible" type of object, what would
be the use for this kind of object? If it's completely ignored in the
intersection tests, that would be the same thing as not having the object
in the scene at all. What's the use of this kind of non-existent object?

-- 
#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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