> The above code produces two lines of artifacts across the torus for me.
> Anyone else see this problem and better yet do you know how I can fix it?

The math necessary for rendering a torus tends to be pretty sensitive and
can create artifacts sometimes. To switch to a different method of
intersection calculation, use the keyword "sturm" in your torus. This should
be more accurate and in your case I believe it fixes the problem.

 - Slime
 [ http://www.slimeland.com/ ]

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