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From: Jaime Vives Piqueres
Subject: artifacts & save/load radiosity (64KB)
Date: 17 Dec 2001 20:35:12
Message: <3c1e56f8@news.povray.org>
Hi all:

  I must admit this is the first time I've tried this wonderful trick of 
saving radiosity with a "dummy" scene. It works pretty well. So well that 
it even gets ride of the radiosity artifacts on my poor settings! I'm the 
only who experienced this? 

  I have a WIP with many objects and tracing very slow with "real" 
radiosity, and producing very visible artifacts. Then I wrote a "dummy" 
version of the textures and rendered saving radiosity (the first image 
attached). As a first test, with the same faked textures, I re-rendered the 
scene, this time loading the file and setting always_sample off and 
pretraces to 1 (second image). As you can see, the artifacts magically 
disapeared.... 

  !?

-- 
Jaime Vives Piqueres

La Persistencia de la Ignorancia
http://www.ignorancia.org


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Attachments:
Download 'office_rad_normal.jpg' (34 KB)
Download 'office_rad_normal_loaded.jpg' (31 KB)

Preview of image 'office_rad_normal.jpg'
office_rad_normal.jpg

Preview of image 'office_rad_normal_loaded.jpg'
office_rad_normal_loaded.jpg


 

From: Slime
Subject: Re: artifacts & save/load radiosity (64KB)
Date: 17 Dec 2001 21:11:38
Message: <3c1e5f8a$1@news.povray.org>
Wow. Very realistic, except for a few details here and there.

Do another one with AA =)

- Slime
[ http://www.slimeland.com/ ]
[ http://www.slimeland.com/images/ ]


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From: Christoph Hormann
Subject: Re: artifacts & save/load radiosity (64KB)
Date: 17 Dec 2001 22:08:48
Message: <3C1E6CE6.E1273A1B@gmx.de>
Jaime Vives Piqueres wrote:
> 
> Hi all:
> 
>   I must admit this is the first time I've tried this wonderful trick of
> saving radiosity with a "dummy" scene. It works pretty well. So well that
> it even gets ride of the radiosity artifacts on my poor settings! I'm the
> only who experienced this?
> 

I have not much tried this method yet, it seems that the results are less
'precise' (or 'realistic') but look fairly good.  And if i understand it
right you can do any 'in between' version when you increase the complexity
of the dummy scene.  

Could you show the geometry of your dummy scene?

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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From: Jaime Vives Piqueres
Subject: Re: artifacts & save/load radiosity (64KB)
Date: 17 Dec 2001 22:29:52
Message: <3c1e71df@news.povray.org>
Christoph Hormann wrote:

> And if i understand it right you can do any 'in between' version when you 
> increase the complexity of the dummy scene.

  Hmmm... sorry, but I do not understand what you mean here... (my english, 
sure).
 
> Could you show the geometry of your dummy scene?

  :) ...that's the dummy scene! Both images are rendered from the real 
scene, but with all textures changed to simple pigments and removing all 
glass. The real one it's just the same but with realistic textures and the 
glass sheets. Indeed, the scene is no yet finished, I must add still more 
objects and replace some placeholders. It started as a test for my light 
macro, but I can't do test scenes... something always urges me to finish 
them.

  I will trace the real scene with more resolution this night (with the 
saved radiosity data), to see if it really lacks precision.
 
-- 
Jaime Vives Piqueres

La Persistencia de la Ignorancia
http://www.ignorancia.org


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From: Fabien Mosen
Subject: Re: artifacts & save/load radiosity (64KB)
Date: 17 Dec 2001 22:31:36
Message: <3C1E72B8.80909@skynet.be>
Jaime Vives Piqueres wrote:

>   I must admit this is the first time I've tried this wonderful trick of 
> saving radiosity with a "dummy" scene. It works pretty well. So well that 
> it even gets ride of the radiosity artifacts on my poor settings! I'm the 
> only who experienced this? 


I'm somewhat convinced that commercial rendering packages uses 
simplified textures for their radiance samples, thus removing many 
artefacts and improving speed.

I'd like to insist on this : there should be an option to turn off
reflection and refraction for radiance samples, and it's probably
time to find a modern usefulness to "quick_color"...

Fabien.


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From: Jaime Vives Piqueres
Subject: Re: artifacts & save/load radiosity (64KB)
Date: 17 Dec 2001 22:35:17
Message: <3c1e7324@news.povray.org>
Slime wrote:

> Wow. Very realistic, except for a few details here and there.

  Hey, don't go so fast to the attachments! I said they were tests! :) The 
realistic part I hope it's comming from the light sources, obtained with a 
macro I'm writing (no yet polished).

> Do another one with AA =)

  No. I'm planning to use focal blur for some reasons...

-- 
Jaime Vives Piqueres

La Persistencia de la Ignorancia
http://www.ignorancia.org


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From: Christoph Hormann
Subject: Re: artifacts & save/load radiosity (64KB)
Date: 18 Dec 2001 08:54:06
Message: <3C1F042D.4C280D15@gmx.de>
Jaime Vives Piqueres wrote:
> 
>   :) ...that's the dummy scene! Both images are rendered from the real
> scene, but with all textures changed to simple pigments and removing all
> glass. The real one it's just the same but with realistic textures and the
> glass sheets. Indeed, the scene is no yet finished, I must add still more
> objects and replace some placeholders. It started as a test for my light
> macro, but I can't do test scenes... something always urges me to finish
> them.
> 

So you did not change the scene geometry for these renders at all, seems i
got this wrong. 

When you use 'always_sample off' it's usually important to use a low
pretrace_end and it can even be a good idea to do the radiosity-render at
higher resolution.  Otherwise the radiosity data would possibly not
correspond to the settings used.  In a convential radiosity render this is
not that important because samples are still taken during the final trace.

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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From: Arthur Flint
Subject: Re: artifacts & save/load radiosity (64KB)
Date: 18 Dec 2001 13:46:38
Message: <Xns917B593DE1BA1mrartchesapeakenet@204.213.191.226>
Fabien Mosen scribis news:3C1### [at] skynetbe:

> and it's probably time to find a modern usefulness to "quick_color"...
 
Lets see: quick_color would have to get enabled at the same quality 
settings as radiosity or radiosity needs to be enabled at +q5.

personally, I think a command line/ ini file setting to enable quick_color 
would be better. 


-- 
"The only difference between me and a madman is I'm not mad" Salvidor Dali

Arto


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From: Jaime Vives Piqueres
Subject: Re: artifacts & save/load radiosity (65KB)
Date: 18 Dec 2001 15:07:50
Message: <3c1f5bbf@news.povray.org>
Jaime Vives Piqueres wrote:

>   I will trace the real scene with more resolution this night (with the
> saved radiosity data), to see if it really lacks precision.

  That's a test render of the real scene, with the reflective textures  and 
glass. It uses the radiosity saved on the first render posted (that with 
the artifacts). I think the artifacts disapear by using pretrace start and 
end set to 1.

  About the scene itself, I've still to work a lot more...

-- 
Jaime Vives Piqueres

La Persistencia de la Ignorancia
http://www.ignorancia.org


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Attachments:
Download 'office.jpg' (65 KB)

Preview of image 'office.jpg'
office.jpg


 

From: Christoph Hormann
Subject: Re: artifacts & save/load radiosity (65KB)
Date: 18 Dec 2001 16:51:24
Message: <3C1F740B.D22AEE80@gmx.de>
Jaime Vives Piqueres wrote:
> 
> Jaime Vives Piqueres wrote:
> 
> >   I will trace the real scene with more resolution this night (with the
> > saved radiosity data), to see if it really lacks precision.
> 
>   That's a test render of the real scene, with the reflective textures  and
> glass. It uses the radiosity saved on the first render posted (that with
> the artifacts). I think the artifacts disapear by using pretrace start and
> end set to 1.

I think it looks good, NTL it will be interesting to see it with more
precise radiosity data.  The reflective textures with normal look somewhat
strange, maybe try the layered textures blurred reflection method.

> 
>   About the scene itself, I've still to work a lot more...
> 

I think there is already quite a lot of detail, the plants and other
decoration look really nice, only the wireless phones, monitors etc. are
somewhat remarkable. ;-)

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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