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So I was very impressed by Tor's "Villarceau Circles" in the hall of fame
section, and since the source was kindly made available I decided to render
a large version for my desktop (1280x960). It took a while (~18h) to render
but I was delighted with the result...
..... until I noticed the weird grey artifacts, that is. I've highlighted a
few of the more obvious ones in the detail images below. Does anyone have
any ideas why they appeared and how I can prevent them? I can repair some
of them by retouching the image in Paint, but that seems a rather cludgy
solution (and obviously doesn't work for some areas of the image) - I'd
rather re-run the render with a fixed setting.
Render settings 1280x960, radiosity and photon settings unchanged from Tor's
source file, +A0.3, POV-ray 3.6 for Windows.
Cheers!
--
Ben
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Attachments:
Download 'copy 2 of villarceau.png' (514 KB)
Preview of image 'copy 2 of villarceau.png'
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Ben nous apporta ses lumieres en ce 2005-03-18 04:08:
> So I was very impressed by Tor's "Villarceau Circles" in the hall of fame
> section, and since the source was kindly made available I decided to render
> a large version for my desktop (1280x960). It took a while (~18h) to render
> but I was delighted with the result...
>
> ..... until I noticed the weird grey artifacts, that is. I've highlighted a
> few of the more obvious ones in the detail images below. Does anyone have
> any ideas why they appeared and how I can prevent them? I can repair some
> of them by retouching the image in Paint, but that seems a rather cludgy
> solution (and obviously doesn't work for some areas of the image) - I'd
> rather re-run the render with a fixed setting.
>
> Render settings 1280x960, radiosity and photon settings unchanged from Tor's
> source file, +A0.3, POV-ray 3.6 for Windows.
>
> Cheers!
>
> --
> Ben
>
>
> ------------------------------------------------------------------------
>
Those don't look like artefacts to me. It looks more like filtered lighting on the
edges of the
silver bands.
Alain
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I haven't seen the source, but maybe increasing max_trace_level might help
you out.
I usually have it on max_trace_level set to 25.
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"Eli" <eli### [at] jehoel net> wrote:
> I haven't seen the source, but maybe increasing max_trace_level might help
> you out.
> I usually have it on max_trace_level set to 25.
Okay - the global_settings of the source file have max_trace_level at 12,
but the photons section has it at only 5. (The source is
http://home.no/t-o-k/POV-Ray/Villarceau_Circles-CSG.txt)
Since I don't mind much how long this takes, so long as it comes out well,
I've bumped both up to 25 and am running the render again - we'll see what
the result looks like. *checks his watch* Probably sometime around June,
then. ;)
Thanks :)
--
Ben
~"When I look around, I see numb empty faces, the world is waiting to die...
this apathy is so suffocating, the slow decay of my mind..."~
- 'Television', Stabbing Westward
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you can try first to render the artifacted parts of the image just to if
this is going to work out.....
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news:423ab4f1$1@news.povray.org...
> Those don't look like artefacts to me. It looks more like filtered
lighting on the edges of the
> silver bands.
>
> Alain
The dark dots?
Marc
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If that's an isosurface, maybe it needs a lower accuracy value.
- Slime
[ http://www.slimeland.com/ ]
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Ben wrote:
>
> ..... until I noticed the weird grey artifacts, that is. I've highlighted a
> few of the more obvious ones in the detail images below. Does anyone have
> any ideas why they appeared and how I can prevent them? I can repair some
Looks like a case of "not enough photons".
--
Maurice
http://get-me.to/Hendrix
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GEd-s+:+aC++UL+PL+E-W++N++o--K-
wO---M-VPS+PEY+PGPt++++5--XRtv+
b+DI+D--Ge++h----y++++
------END GEEK CODE BLOCK------
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"Eli" <eli### [at] jehoelnet> wrote:
> you can try first to render the artifacted parts of the image just to if
> this is going to work out.....
I didn't realise this was possible until you mentioned it - the render is
now quite close to the first major artifact region, so I'll let it carry
on.
I shall let y'all know how it works out by tomorrow...
--
Ben
"They always say time changes things, but you actually have to change them
yourself."
- Andy Warhol
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Hmm... I ran the render again with max_trace_level at 25, for both rays and
photons, and with photons spacing set to one-half the previous value (0.01)
on Maurice's suggestion - I believe that increases the photon count, please
correct me if I'm wrong? Still the same artifacts...
In response to Slime, there are no isosurfaces in the image, only tori (and
one plane and one off-camera sphere).
Does anyone have any other suggestions?
Post a reply to this message
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