On 09/04/2015 17:17, clipka wrote:
> Thanks for experimenting with this.
>

No problem. It was bugging me.

Interesting effect.

https://youtu.be/IMu4EEgtbdU

One of the other tests.
The arrow is pointing at the parallel light source.


> 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.
>

Obviously.

> Is this the Poly_Torus or the inbuilt torus primitive?


The inbuilt torus primitive. Rendered in Ver 3.62



-- 

Regards
     Stephen

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