POV-Ray : Newsgroups : povray.bugreports : Strange Artefact in Animation Server Time: 25 Jun 2019 19:57:29 GMT
  Strange Artefact in Animation (Message 1 to 7 of 7)  
From: Sven Littkowski
Subject: Strange Artefact in Animation
Date: 29 Mar 2015 09:35:04
Message: <web.5517c69b250fa02e5189b500@news.povray.org>
When I finished to animate a scene (let a part rotate), I discovered a strange
artifact in the scene: something like a tall but thin black line or cut-out
where no cut-out is supposed to be.

Please see the video file here (closer to the end of the video):
https://www.facebook.com/video.php?v=1032986830049905&set=vb.100000157941289&type=3


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From: clipka
Subject: Re: Strange Artefact in Animation
Date: 29 Mar 2015 14:35:00
Message: <55180d94$1@news.povray.org>
Am 29.03.2015 um 11:32 schrieb Sven Littkowski:
> When I finished to animate a scene (let a part rotate), I discovered a strange
> artifact in the scene: something like a tall but thin black line or cut-out
> where no cut-out is supposed to be.

That does indeed look like a render artifact; unfortunately it will be 
near impossible to diagnose without the scene code.

Can you try to trim it down to some minimal offending scene?


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From: And
Subject: Re: Strange Artefact in Animation
Date: 29 Mar 2015 15:15:01
Message: <web.551816589c9a78327c50b750@news.povray.org>
clipka <ano### [at] anonymousorg> wrote:
> Am 29.03.2015 um 11:32 schrieb Sven Littkowski:
> > When I finished to animate a scene (let a part rotate), I discovered a strange
> > artifact in the scene: something like a tall but thin black line or cut-out
> > where no cut-out is supposed to be.
>
> That does indeed look like a render artifact; unfortunately it will be
> near impossible to diagnose without the scene code.
>
> Can you try to trim it down to some minimal offending scene?

I ever saw this on my torus.


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From: Kenneth
Subject: Re: Strange Artefact in Animation
Date: 29 Mar 2015 23:40:01
Message: <web.55188c219c9a7832f644696d0@news.povray.org>
"Sven Littkowski" <nomail@nomail> wrote:
> When I finished to animate a scene (let a part rotate), I discovered a strange
> artifact in the scene: something like a tall but thin black line or cut-out
> where no cut-out is supposed to be.
>

The artifact seems to be associated with only one part of your model (and note
how it disappears *behind* the smallest rounded surface forms, as the model
rotates.) If the model is a CSG construct, try temporarily removing the single
object that shows the artifact. If the black line disappears, that will at least
narrow down the problem.

Some guesses:
Bounding-box problem?
Coincident-surfaces problem? (I.e., with some other 'buried' part of the model
whose surface is 'coincident' with the visible shape.)


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From: Sven Littkowski
Subject: Re: Strange Artefact in Animation
Date: 30 Mar 2015 14:20:00
Message: <web.55195ae99c9a78325189b500@news.povray.org>
Thanks to you both.

I think, I would make the scene code available to both of you for further
experimenting, as you two seem to have more knowledge than I have, how to
investigate into this. You two saw the animation on Facebook, that is my
profile. Please contact me there, and I can give you my e-mail address or give
you even the code there.

And big thanks for assisting in this matter. :-D

Steven




"Sven Littkowski" <nomail@nomail> wrote:
> When I finished to animate a scene (let a part rotate), I discovered a strange
> artifact in the scene: something like a tall but thin black line or cut-out
> where no cut-out is supposed to be.
>
> Please see the video file here (closer to the end of the video):
> https://www.facebook.com/video.php?v=1032986830049905&set=vb.100000157941289&type=3


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From: clipka
Subject: Re: Strange Artefact in Animation
Date: 30 Mar 2015 18:44:14
Message: <5519997e$1@news.povray.org>
Am 30.03.2015 um 16:17 schrieb Sven Littkowski:
> Thanks to you both.
>
> I think, I would make the scene code available to both of you for further
> experimenting, as you two seem to have more knowledge than I have, how to
> investigate into this. You two saw the animation on Facebook, that is my
> profile. Please contact me there, and I can give you my e-mail address or give
> you even the code there.
>
> And big thanks for assisting in this matter. :-D

Please forgive me for not being too inclined to hunt down this issue on 
your terms.

If you want this to be examined and eventually fixed, please help me in 
this process by making a reasonable effort to trim down the scene 
yourself (it doesn't require special expertise after all; just try 
taking out different parts of the scene that seem unimportant for the 
artifact to occur), and send that trimmed-down scene file to Christoph, 
at Lipka minus Koeln, dot de.

Note that the simpler the scene, the higher the chances that I will 
debug the issue sooner rather than later.


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From: And
Subject: Re: Strange Artefact in Animation
Date: 31 Mar 2015 15:35:01
Message: <web.551abdbc9c9a78322979ad620@news.povray.org>
clipka <ano### [at] anonymousorg> wrote:
> Am 30.03.2015 um 16:17 schrieb Sven Littkowski:
> > Thanks to you both.
> >
> > I think, I would make the scene code available to both of you for further
> > experimenting, as you two seem to have more knowledge than I have, how to
> > investigate into this. You two saw the animation on Facebook, that is my
> > profile. Please contact me there, and I can give you my e-mail address or give
> > you even the code there.
> >
> > And big thanks for assisting in this matter. :-D
>
> Please forgive me for not being too inclined to hunt down this issue on
> your terms.
>
> If you want this to be examined and eventually fixed, please help me in
> this process by making a reasonable effort to trim down the scene
> yourself (it doesn't require special expertise after all; just try
> taking out different parts of the scene that seem unimportant for the
> artifact to occur), and send that trimmed-down scene file to Christoph,
> at Lipka minus Koeln, dot de.
>
> Note that the simpler the scene, the higher the chances that I will
> debug the issue sooner rather than later.

I will provide my example this weekend. If you can debug these things it will be
great!


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