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I’ve run into a problem using a large sphere_sweep. I get a horizontal,
straight line artefact.
You can change the location of the artefact by raising or lowering
either the camera location or look_at vector.
Happens in both ver 3.6 and 3.7
I posted the pov and ini files in povray.binaries.scene-files
--
Regards
Stephen
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Attachments:
Download 'hilbert_curve_01a2_0000.png' (972 KB)
Preview of image 'hilbert_curve_01a2_0000.png'
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On 03/07/2018 08:23 AM, Stephen wrote:
>
> I’ve run into a problem using a large sphere_sweep. I get a horizontal,
> straight line artefact.
> You can change the location of the artefact by raising or lowering
> either the camera location or look_at vector.
> Happens in both ver 3.6 and 3.7
> I posted the pov and ini files in povray.binaries.scene-files
>
Thanks for posting the scene and ini file. It looks like this is one of
the sphere_sweep artifacts Christoph fixed in the updates for
release/v3.8.0 and so too in the master (v3.8.1) branch.
Aside: this is the sort of artifact I've sometimes been able to
ameliorate by using an odd number of pixels in a direction perpendicular
to the artifact - trick works better at low resolutions. In this case an
odd number of pixels vertically just changes to 3.7.0 artifact some...
Bill P.
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On 07/03/2018 13:51, William F Pokorny wrote:
> On 03/07/2018 08:23 AM, Stephen wrote:
>>
>> I’ve run into a problem using a large sphere_sweep. I get a
>> horizontal, straight line artefact.
>> You can change the location of the artefact by raising or lowering
>> either the camera location or look_at vector.
>> Happens in both ver 3.6 and 3.7
>> I posted the pov and ini files in povray.binaries.scene-files
>>
>
> Thanks for posting the scene and ini file. It looks like this is one of
> the sphere_sweep artifacts Christoph fixed in the updates for
> release/v3.8.0 and so too in the master (v3.8.1) branch.
>
Thanks for the quick reply, Bill. I am pleased that it might be a known
artefact. It looks like the artefact we used to get with SORs when the
view crossed the horizon.
I'll wait until
> Aside: this is the sort of artifact I've sometimes been able to
> ameliorate by using an odd number of pixels in a direction perpendicular
> to the artifact - trick works better at low resolutions. In this case an
> odd number of pixels vertically just changes to 3.7.0 artifact some...
>
Maybe I should have said I was using ver 3.7.0. (I've yet to update my
machine since I had a HDD crash.)
Aside 1
An odd number of pixels doesn't go well with some video codecs.
Aside 2
I was just interested in the 3d shape of the Hilbert curve.
When Maurice and his Blender team fix the Pov file importer. I will
upload an obj file, if anyone is interested. Or if anyone is still using
Bishop3D, a *.bsp one . I managed to import it into that. Oops! that's
the exported file I uploaded but B3D and import it.
It is much easer for me to inspect it with an OpenGl display.
--
Regards
Stephen
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On 07/03/2018 15:00, Stephen wrote:
>> Thanks for posting the scene and ini file. It looks like this is one
>> of the sphere_sweep artifacts Christoph fixed in the updates for
>> release/v3.8.0 and so too in the master (v3.8.1) branch.
>>
> Thanks for the quick reply, Bill. I am pleased that it might be a known
> artefact. It looks like the artefact we used to get with SORs when the
> view crossed the horizon.
> I'll wait until
Well I couldn't wait ;) I downloaded
povray-3.8.0-alpha.9475849-av541-Win64.7z
Nice one Christoph :)
--
Regards
Stephen
Post a reply to this message
Attachments:
Download 'hilbert_curve_01a2m_0000.png' (922 KB)
Preview of image 'hilbert_curve_01a2m_0000.png'
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Le 18-03-07 à 08:23, Stephen a écrit :
>
> I’ve run into a problem using a large sphere_sweep. I get a horizontal,
> straight line artefact.
> You can change the location of the artefact by raising or lowering
> either the camera location or look_at vector.
> Happens in both ver 3.6 and 3.7
> I posted the pov and ini files in povray.binaries.scene-files
>
Old bug that was present in version 3.5 and probably earlier.
Seems to have been fixed in the current beta, and maybe in UberPov.
Post a reply to this message
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On 07/03/2018 20:51, Alain wrote:
> Le 18-03-07 à 08:23, Stephen a écrit :
>>
>> I’ve run into a problem using a large sphere_sweep. I get a
>> horizontal, straight line artefact.
>> You can change the location of the artefact by raising or lowering
>> either the camera location or look_at vector.
>> Happens in both ver 3.6 and 3.7
>> I posted the pov and ini files in povray.binaries.scene-files
>>
>
> Old bug that was present in version 3.5 and probably earlier.
I've not used it much since then.
> Seems to have been fixed in the current beta, and maybe in UberPov.
It does. :-)
--
Regards
Stephen
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On 07/03/2018 15:00, Stephen wrote:
> Maybe I should have said I was using ver 3.7.0. (I've yet to update my
> machine since I had a HDD crash.)
I compared the time taken to render the file and the 3.8 alpha is slower.
3.7.0 - 7m 11s
3.8 alpha - 8m 3s
--
Regards
Stephen
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On 08/03/2018 06:00, Stephen wrote:
> 3.8 alpha
Forgot to put which alpha
3.8.0-alpha.9475849+av541.msvc14.win
--
Regards
Stephen
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Am 08.03.2018 um 07:00 schrieb Stephen:
> On 07/03/2018 15:00, Stephen wrote:
>> Maybe I should have said I was using ver 3.7.0. (I've yet to update my
>> machine since I had a HDD crash.)
>
> I compared the time taken to render the file and the 3.8 alpha is slower.
>
> 3.7.0 - 7m 11s
> 3.8 alpha - 8m 3s
>
Yes, the elimination of the sphere sweep artifacts was paid for in
sphere sweep performance.
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On 08/03/2018 09:51, clipka wrote:
> Am 08.03.2018 um 07:00 schrieb Stephen:
>> On 07/03/2018 15:00, Stephen wrote:
>>> Maybe I should have said I was using ver 3.7.0. (I've yet to update my
>>> machine since I had a HDD crash.)
>>
>> I compared the time taken to render the file and the 3.8 alpha is slower.
>>
>> 3.7.0 - 7m 11s
>> 3.8 alpha - 8m 3s
>>
> Yes, the elimination of the sphere sweep artifacts was paid for in
> sphere sweep performance.
>
As long as you know. I'm happy.
--
Regards
Stephen
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