>All questions are allowed... Even "How many angels can dance on the head of a pin ?"
>Getting the correct answer might be harder.
>
>The code for inside and trace is always different (by design).
>I guess that different algorithms can give different results.
>(Just look at the sturm solver option for example)...

My guess would be that you're running afoul of the provisions in all of the
intersection code that throw out intersections that are too close to the
start of the ray.

-- 
#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{rgbf 1}hollow interior{media{emission 3-T}}}#end 
Z(-x-x.2x)camera{location z*-10rotate x*90normal{bumps.02scale.05}}

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