Am 05.04.2015 um 06:25 schrieb And:
> Thank you.
> I explain my intend of doing it. I made a macro that is used for chamfering a
> cylinder and it is necessary to take the torus's inner surface in some
> conditions. So I intersect sphere and torus with negative major_radius and
> sometimes found these black lines.

Have you tried using a positive major_radius and the "inverse" keyword 
instead?

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