Am 09.04.2015 um 12:33 schrieb Stephen:
> On 09/04/2015 07:33, And wrote:
>> ... this is what I rendered.
>
> That is the pattern I got when I used your original code. But something
> looks wrong with the shading and shadows. So I did a series of renders
> with a simpler material that is matt. I orbited the light around your
> shape and included a couple of primitives (two spheres and a lathe)
> using the same texture, for comparison. The Blue arrow points to the light.
> Unless someone can explain it by the shape of the object. It looks like
> a bug to me.

Thanks for experimenting with this.

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.

Is this the Poly_Torus or the inbuilt torus primitive?

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