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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.
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Am 11.10.2017 um 05:00 schrieb omniverse:
> "omniverse" <omn### [at] charter net> wrote:
> Of course I notice after posting my last reply that simply adding keyword sturm
> to the sor bell fixes it completely, at least from what I can see from the
> example.
>
> Unfortunate that the same can't be said for lathe, which doesn't seem affected
> by sturm at all.
It should be though, as it does pass the flag to the root solver.
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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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William F Pokorny <ano### [at] anonymousorg> wrote:
> 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.
I think it would be cleaner to create a new issue. We don't know at this point
whether they are genuinely related -- and I'm pretty sure each needs its own
separate fix anyway.
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On 10/16/2017 10:02 AM, clipka wrote:
> William F Pokorny <ano### [at] anonymousorg> wrote:
>...
> I think it would be cleaner to create a new issue. We don't know at this point
> whether they are genuinely related -- and I'm pretty sure each needs its own
> separate fix anyway.
>
OK. See: https://github.com/POV-Ray/povray/issues/335
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