Sir Charles W. Shults III wrote:

>     Hey, you're right!  Perhaps we could use a slightly different sized sphere-
> like just a hair larger- and move it downward a bit to compensate so the
> intersection is the proper size?  It would be a real pain, but it could be
> tried.


It helps, but it takes more than a hair to get rid of the effect.
The attached image shows this variant:

union {
    sphere { <0, 7.1645, 0>, 10.2 }
    difference {
       cylinder { <0, 0, 0>, <0, 8.5963, 0>, 20 }
       torus { 20, 10 translate <0, 10, 0> }
    }
    texture { pigment { Gray50 } finish { Phong_Shiny } }
}

/ib

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