Am 09.04.2015 um 18:17 schrieb clipka:

> Yes, this certainly is a bug. I haven't looked at the code yet, but
> judging from the effect I would assume that the surface normal at a
> given intersection point is computed as the (normalized) vector from the
> closest point on the "centroid circle" to the surface point; obviously
> this breaks down for the inner spindle of a spindle torus.

And that's exactly what's happening.

I've just submitted a fix to GitHub 
(https://github.com/POV-Ray/povray/commit/c3551f249c89ffc817a4deb2acea0412a0b9913f).

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