clipka <ano### [at] anonymousorg> wrote:
> 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?

Oh, I will try later. I just found that the torus object's overlay area is not
inside the object.
And when I use polynomial object directly it shows strong precision problem
because my torus is too small.

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