There is a simple, obdvious problem with this code, but I just can't see it.
Why do a get a lip where the torus rests on the clipped sphere?
Please save my sanity!!!

background {rgb 1}
camera {location <1,2,-2> look_at 0}
light_source {<-600, 400, -400> color rgb 1}

intersection {
 sphere {0, 1}
 plane {y*1, .5}
 pigment {rgb 1}}

torus {cos(asin(.5))-.05, .05 sturm translate y*.5 pigment {rgb 1}}

Thank you,
 -Shay

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