Am 12.04.2015 um 03:58 schrieb Tor Olav Kristensen:
> clipka <ano### [at] anonymous org> wrote:
>>
>> 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.
>
> This ancient thread might be relevant:
>
> Newsgroup: povray.binaries.images
> From: Tor Olav Kristensen
> Subject: Torus problem (69KB)
> Date: 21st April 2000
>
http://news.povray.org/povray.binaries.images/thread/%3C38FFC5BF.757B1EBB%40hotmail.com%3E
It's pretty irrelevant insofar as I don't need it to debug or fix the
issue reported by And - I've already done that by now :)
But yes, the issue you reported back then might be related indeed.
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