On 18 Nov 2001 05:44:08 -0500, Warp wrote:
> point of view of the photon, it always travels straight (ie. the photon
> itself always goes ahead, without never turning to any other direction).

In fact, since time does not exist for photons, they couldn't turn even
if they "wanted" to.

-- 
#macro R(L P)sphere{L F}cylinder{L P F}#end#macro P(V)merge{R(z+a z)R(-z a-z)R(a
-z-z-z a+z)torus{1F clipped_by{plane{a 0}}}translate V}#end#macro Z(a F T)merge{
P(z+a)P(z-a)R(-z-z-x a)pigment{rgbt 1}hollow interior{media{emission T}}finish{
reflection.1}}#end Z(-x-x.2y)Z(-x-x.4x)camera{location z*-10rotate x*90}

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