On 10/11/2017 04:57 AM, clipka wrote:
> Am 09.10.2017 um 23:16 schrieb David Mandelberg:
>> When I render the below scene, there are some spurious black artifacts near the
>> center of the red vuvuzela. Without the translation and rotation, the artifacts
>> go away. I'm using POV-Ray 3.7.0 on Ubuntu 16.04.
> 
> I wouldn't be surprised if these artefacts were related to a similar
> issue with 3rd-order polynomials (e.g. bezier or cubic) in the sphere
> sweep primitive.
> 

I too think this likely the case.

Christoph, do you want to update the sphere_sweep github issue :

https://github.com/POV-Ray/povray/issues/147

to include this lathe case?

Or, should we create a new github issue for it and reference #147 as 
likely related?

Bill P.

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