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Thank you Steve, Setep and Christoph for encouraging me
to do more of these.
This time I followed Christoph's advice to use change
texture and use radiosity.
But since I'm not familiar with radiosity settings,
I borrowed some code from a POV-file that Gilles Tran
posted to povray.text.scene-files back in August:
news://news.povray.org/398EE231.F90E52DC%40inapg.inra.fr
This is my first radiosity image. And my P100 used about
70 minutes to render it.
I have seen nice radiosity images posted by Gilles, Xplo
and Kari, but I'm not able to tell how they differ.
Can anyone please try to explain me what I should look
for when comparing those images ?
--
Best regards,
Tor Olav
mailto:tor### [at] hotmail com
http://www.crosswinds.net/~tok
Post a reply to this message
Attachments:
Download 'otherbonds.jpg' (52 KB)
Preview of image 'otherbonds.jpg'
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That's pure art!
Marc-Hendrik
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Tor Olav Kristensen wrote:
>
> ------------------------------------------------------------------------
> [Image]
Impressive!
--
Francois Labreque | //\\ Wear an ASCII ribbon!
flabreque | || ||
@ | \\// Support the campain
videotron.ca \\ against HTML e-mail
//\\ and news!
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Tor Olav Kristensen wrote:
>
> Thank you Steve, Setep and Christoph for encouraging me
> to do more of these.
>
> This time I followed Christoph's advice to use change
> texture and use radiosity.
>
> But since I'm not familiar with radiosity settings,
> I borrowed some code from a POV-file that Gilles Tran
> posted to povray.text.scene-files back in August:
>
> news://news.povray.org/398EE231.F90E52DC%40inapg.inra.fr
>
> This is my first radiosity image. And my P100 used about
> 70 minutes to render it.
>
I looks good, the bright parts are a bit overexposed. The radiosity
settings seem quite good, i suppose you used the same values Gilles used
in his picture.
> I have seen nice radiosity images posted by Gilles, Xplo
> and Kari, but I'm not able to tell how they differ.
>
> Can anyone please try to explain me what I should look
> for when comparing those images ?
>
The main problem about radiosity pictures are of course artefacts, a
strong normal like in your picture often avoids this to some extend. Have
you had a look at my radiosity tutorial?
Christoph
--
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
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Tor Olav Kristensen wrote:
>
> I have seen nice radiosity images posted by Gilles, Xplo
> and Kari, but I'm not able to tell how they differ.
>
> Can anyone please try to explain me what I should look
> for when comparing those images ?
I have tried to to use pov radiosity to simulate the actual physical
energy transport process from the virtual environment through monitor
to the viewers eyes, within the limits of pov's capabilities of course.
One key element is missing in those experiments but once I find a way
to get 48bit output from pov expect to see some more tests.
Xplo optimises radiosity quality/render time and Gilles optimises
visual quality :)
______________________________________________________________________
Kari Kivisalo http://www.kivisalo.net
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Very original.
--
Cheers
Steve email mailto:ste### [at] zeroppsuklinuxnet
%HAV-A-NICEDAY Error not enough coffee 0 pps.
web http://www.zeropps.uklinux.net/
or http://start.at/zero-pps
11:04pm up 16 days, 43 min, 4 users, load average: 1.00, 1.01, 1.00
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Hey, this is cool! I like the radiosity concrete pics, Rivenesque. Interesting
design.
--
David Fontaine <dav### [at] faricynet> ICQ 55354965
My raytracing gallery: http://davidf.faricy.net/
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Hi,
I took the same scene as Tor Olav Kristensen from Gilles Tran
> news://news.povray.org/398EE231.F90E52DC%40inapg.inra.fr
And worked a little bit with it
Stefan
--
http://home.t-online.de/home/StefanWz/
Post a reply to this message
Attachments:
Download 'texture2.pov.txt' (2 KB)
Download 'texture2.jpg' (15 KB)
Preview of image 'texture2.jpg'
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wow
--
Rick
POV-Ray News & Resources - http://povray.co.uk
Kitty5 WebDesign - http://kitty5.com
Hi-Impact web site design & database driven e-commerce
TEL : +44 (01625) 266358 - FAX : +44 (01625) 611913 - ICQ : 15776037
PGP Public Key
http://pgpkeys.mit.edu:11371/pks/lookup?op=get&search=0x231E1CEA
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Tor Olav Kristensen wrote:
>
> ...
>
> This is my first radiosity image. And my P100 used about
> 70 minutes to render it.
>
Nice picture. Another example on how radiosity improves image quality,
though the rendering time price was high.
Alberto.
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Thank you very much everyone !
Sorry for not replying earlier.
(I've been out in the real world doing a lot of ray-catching
with my macro lens today.)
I guess I'll use radiosity a lot in the future. I love it !
To Christoph:
I have now had a look at your radiosity pages and I find
them very informative. Thanks for making them.
To Kari:
Can you give any clues on what differences we might see
if POV-Ray becomes able to output 48 bit images ?
To David:
I'm not familiar with "Rivenesque".
Do you have any links to nice Rivenesque images ?
--
Best regards,
Tor Olav
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok
Tor Olav Kristensen wrote:
>
>...
> ------------------------------------------------------------------------
> [Image]
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"Tor Olav Kristensen" <tor### [at] hotmailcom> wrote in message
news:3A9074CC.433BCBA3@hotmail.com...
>
> I'm not familiar with "Rivenesque".
> Do you have any links to nice Rivenesque images ?
http://sirrus.cyan.com/online/Riven/GameShots
--
Andy Cocker
---------------------------------------------------------------
listen to my music at:
www.mp3.com/lunarland
---------------------------------------------------------------
'I spilled spot remover on my dog. He's gone now. '
'I went to a restaurant that serves "breakfast at any time."
So I ordered french toast during the Renaissance. '
- Steven Wright.
---------------------------------------------------------------
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Andy Cocker wrote:
>
> "Tor Olav Kristensen" <tor### [at] hotmailcom> wrote in message
> news:3A9074CC.433BCBA3@hotmail.com...
> >
> > I'm not familiar with "Rivenesque".
> > Do you have any links to nice Rivenesque images ?
>
> http://sirrus.cyan.com/online/Riven/GameShots
Ahh... So it's about a game; Riven. Those images are great !
(I guess they are raytraced with radiosity =)
Is the game equally great ?
Thanks Andy.
--
Best regards,
Tor Olav
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok
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"Tor Olav Kristensen" <tor### [at] hotmailcom> wrote in message
news:3A907A86.DFDD441D@hotmail.com...
>
> Ahh... So it's about a game; Riven. Those images are great !
> (I guess they are raytraced with radiosity =)
>
I'm not sure which software they used on this.. maybe their own 'in-house'
code. I think they used Strata for Riven's predecessor.. 'Myst'.
> Is the game equally great ?
You either love it or hate it, I think. Personally I really liked it.. very
atmospheric.. it's a puzzle-solving game really. My favourite aspect was
that although the game is mainly still images, occasionally parts of these
images are animated.. fireflies buzz around in dark caves etc.
>
>
> Thanks Andy.
>
You're welcome.
--
Andy Cocker
---------------------------------------------------------------
listen to my music at:
www.mp3.com/lunarland
---------------------------------------------------------------
'I spilled spot remover on my dog. He's gone now. '
'I went to a restaurant that serves "breakfast at any time."
So I ordered french toast during the Renaissance. '
- Steven Wright.
---------------------------------------------------------------
Post a reply to this message
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The game, pictures, music, and the mind behind them all is great.
So if someone calls your work "Rivenesque", take it for the
compliment that it is.
Tor Olav Kristensen wrote:
>
> Andy Cocker wrote:
> >
> > "Tor Olav Kristensen" <tor### [at] hotmailcom> wrote in message
> > news:3A9074CC.433BCBA3@hotmail.com...
> > >
> > > I'm not familiar with "Rivenesque".
> > > Do you have any links to nice Rivenesque images ?
> >
> > http://sirrus.cyan.com/online/Riven/GameShots
>
> Ahh... So it's about a game; Riven. Those images are great !
> (I guess they are raytraced with radiosity =)
>
> Is the game equally great ?
>
> Thanks Andy.
>
> --
> Best regards,
>
> Tor Olav
>
> mailto:tor### [at] hotmailcom
> http://www.crosswinds.net/~tok
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Andy Cocker wrote:
>
> "Tor Olav Kristensen" <tor### [at] hotmailcom> wrote in message
> news:3A907A86.DFDD441D@hotmail.com...
> >
> > Ahh... So it's about a game; Riven. Those images are great !
> > (I guess they are raytraced with radiosity =)
> >
>
> I'm not sure which software they used on this.. maybe their own 'in-house'
> code. I think they used Strata for Riven's predecessor.. 'Myst'.
>
> > Is the game equally great ?
>
> You either love it or hate it, I think. Personally I really liked it.. very
> atmospheric.. it's a puzzle-solving game really. My favourite aspect was
> that although the game is mainly still images, occasionally parts of these
> images are animated.. fireflies buzz around in dark caves etc.
Now you made me hope I that get the chance to try
these games one day.
--
Best regards,
Tor Olav
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok
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Tor Olav Kristensen wrote:
>
> Thank you very much everyone !
>
> Sorry for not replying earlier.
> (I've been out in the real world doing a lot of ray-catching
> with my macro lens today.)
>
> I guess I'll use radiosity a lot in the future. I love it !
>
> To Christoph:
> I have now had a look at your radiosity pages and I find
> them very informative. Thanks for making them.
>
Thanks, i'm already planning to add some new things, but don't know when i
have time to make them.
> To Kari:
> Can you give any clues on what differences we might see
> if POV-Ray becomes able to output 48 bit images ?
>
You have more possibilities to adjust contrast etc. after rendering
without too much loss of quality. For example your picture whould still
contain enough diversity in the areas totally white in the 24 bit output.
Although most graphic output devices do not have those capabilities, this
would mean a much higher contrast ratio in the actual data.
What I don't understand is the problem itself, AFAIK Povray can generate
48 bit png files.
Christoph
--
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
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Tor Olav Kristensen wrote:
>
> Can you give any clues on what differences we might see
> if POV-Ray becomes able to output 48 bit images ?
I plan to experiment with different post processing algorithms,
dynamic range compression etc., which take images with high dynamic
range and optimise them for monitor viewing. This requires the 48 bits.
The images should look more like photographs than CG. That's the short
version.
______________________________________________________________________
Kari Kivisalo http://www.kivisalo.net
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Christoph Hormann wrote:
>
> What I don't understand is the problem itself, AFAIK Povray can generate
> 48 bit png files.
I haven't found a single program that can read those pngs and convert
them to raw or 48bit tiff for Photoshop and Matlab. Even some converter
program from the png group reported them as invalid.
______________________________________________________________________
Kari Kivisalo http://www.kivisalo.net
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Kari Kivisalo wrote:
>
> I haven't found a single program that can read those pngs and convert
> them to raw or 48bit tiff for Photoshop and Matlab. Even some converter
> program from the png group reported them as invalid.
>
But libpng obviously supports them (otherwise Povray could not write
them). As the Delphi component i use for reading and writing png's works
fine with grayscale 16 bit i suppose it also works with 48 bit:
http://www.geocities.com/SiliconValley/Network/2114/
It should not be very difficult to write a conversion program, but it
would be better to directly write it with Povray, IIRC Povray 3.5 will add
tiff output.
Christoph
--
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
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In article <3A9220F5.F5E3D687@kivisalo.net>, Kari Kivisalo
<kar### [at] kivisalonet> wrote:
> > Can you give any clues on what differences we might see
> > if POV-Ray becomes able to output 48 bit images ?
>
> I plan to experiment with different post processing algorithms,
> dynamic range compression etc., which take images with high dynamic
> range and optimise them for monitor viewing. This requires the 48 bits.
> The images should look more like photographs than CG. That's the short
> version.
I don't think 48 bit output will do what you want...it doesn't affect
the dynamic range of the image, just the number of levels in each color
channel. You will probably need to use the post_process patch, which has
access to the unclipped, full precision values.
--
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/
<><
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Chris Huff wrote:
>
> In article <3A9220F5.F5E3D687@kivisalo.net>, Kari Kivisalo
> <kar### [at] kivisalonet> wrote:
>
> > I plan to experiment with different post processing algorithms,
> > dynamic range compression etc., which take images with high dynamic
> > range and optimise them for monitor viewing. This requires the 48 bits.
> > The images should look more like photographs than CG. That's the short
> > version.
>
> I don't think 48 bit output will do what you want...it doesn't affect
> the dynamic range of the image, just the number of levels in each color
> channel.
Dynamic range/contrast ratio is directly proportional to number of levels,
when talking about linear samples.
Think about audio analogy, 8bit samples have a dynamic range of 48 dB
and 16 bit samples have 96 dB. ( dB=20*log(max_sample/min_sample) )
I know what I'm doing. Trust me :) I also know what you mean but for
hands on quick testing I have to get the images to Matlab and Photoshop.
______________________________________________________________________
Kari Kivisalo http://www.kivisalo.net
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Kari Kivisalo wrote:
>
> Tor Olav Kristensen wrote:
> >
> > Can you give any clues on what differences we might see
> > if POV-Ray becomes able to output 48 bit images ?
>
> I plan to experiment with different post processing algorithms,
> dynamic range compression etc., which take images with high dynamic
> range and optimise them for monitor viewing. This requires the 48 bits.
> The images should look more like photographs than CG. That's the short
> version.
I see.
Thank you for explaining.
I also wonder if there are any non-linear properties
related to the monitor's "presentations" of the binary
coded light intensities (in images) that needs to be
corrected.
Do you have any thoughts regarding this ?
--
Best regards,
Tor Olav
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok
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I like the over-exposed bits - this makes it seem more real to me (in a
similar way to my comments on lens flare elsewhere). I know that this isn't
a real object (although it would be an interesting challenge for a sculptor)
but I enjoy seeing bits of the real world creeping in.
"Christoph Hormann" <chr### [at] gmxde> very nearly wrote in message
news:3A8F0261.3859B799@gmx.de...
>
> It looks good, the bright parts are a bit overexposed. The radiosity
> settings seem quite good, I suppose you used the same values Gilles used
> in his picture.
>
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Tor Olav Kristensen wrote:
>
> I also wonder if there are any non-linear properties
> related to the monitor's "presentations" of the binary
> coded light intensities (in images) that needs to be
> corrected.
I'm just trying to find a way to present images on a limited contrast
ratio medium. Display device properties and viewing conditions are
a separate problem.
______________________________________________________________________
Kari Kivisalo http://www.kivisalo.net
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