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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