POV-Ray : Newsgroups : povray.binaries.images : Radiosity and caustics, a test (~100kau) Server Time
20 Oct 2026 04:35:04 EDT (-0400)
  Radiosity and caustics, a test (~100kau) (Message 1 to 16 of 16)  
From: TonyB
Subject: Radiosity and caustics, a test (~100kau)
Date: 14 May 2000 19:20:21
Message: <391f34b5@news.povray.org>
I've been in the radiosity mood lately, so I decided to do something about
it. Inspired by the recent images of outdoor radiosity by Fabian Brau, I set
to do something similar myself. Then I remembered that I'm not good at
texturing (yet), so I did something simple, then I played with textures a
bit more, and got something better. Two notes:

1) I would like to thank Mark Wagner for explaining the radiosity stuff to
me (or at least getting me closer to understanding)
2) So you know, everything in this scene uses caustics. Everything. Even the
floor. (It took a little over a 1/2 hour to calculate the photons).


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outdoor-rt.jpg


 

From: Mark Wagner
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 15 May 2000 00:55:29
Message: <391f8341@news.povray.org>
Very nice job!

Mark


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From: Phil Clute
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 15 May 2000 01:59:51
Message: <391F9321.D6A20699@tiac.net>
I like the goldish color. I fiddled with radiosity earlier this
week but it kept getting stuck half way through the render. Oh
well, I'm kind of hooked on the isosurface thing again anyhow so
radiosity will have to wait.

And I like your pov logo too.
-- 
Phil
...coffee?...yes please! extra sugar,extra cream...Thank you.


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From: Rick [Kitty5]
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 15 May 2000 02:47:35
Message: <391f9d87@news.povray.org>
very nice - how about posting your rad / photons settings?

Rick


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From: Fabian BRAU
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 15 May 2000 04:16:00
Message: <391FB233.BC435A8F@umh.ac.be>
The ambience and the global color is very interesting, close to Art
for me! 

Really good job!

And what about lightwave[6]?

Fabian.

TonyB a écrit :
> 
> I've been in the radiosity mood lately, so I decided to do something about
> it. Inspired by the recent images of outdoor radiosity by Fabian Brau, I set
> to do something similar myself. Then I remembered that I'm not good at
> texturing (yet), so I did something simple, then I played with textures a
> bit more, and got something better. Two notes:
> 
> 1) I would like to thank Mark Wagner for explaining the radiosity stuff to
> me (or at least getting me closer to understanding)
> 2) So you know, everything in this scene uses caustics. Everything. Even the
> floor. (It took a little over a 1/2 hour to calculate the photons).
> 
>  [Image]


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From: TonyB
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 15 May 2000 08:17:44
Message: <391feae8@news.povray.org>
>Very nice job!

Thanks. :)


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From: TonyB
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 15 May 2000 08:18:24
Message: <391feb10@news.povray.org>
>very nice - how about posting your rad / photons settings?

Thanks. I don't feel it is done yet, so I wan't to fiddle with it some more
before I post, OK?


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From: TonyB
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 15 May 2000 08:19:04
Message: <391feb38@news.povray.org>
>I like the goldish color. I fiddled with radiosity earlier this
>week but it kept getting stuck half way through the render. Oh
>well, I'm kind of hooked on the isosurface thing again anyhow so
>radiosity will have to wait.

Have fun.

>And I like your pov logo too.

Great. :)


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From: TonyB
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 15 May 2000 08:20:31
Message: <391feb8f@news.povray.org>
>The ambience and the global color is very interesting, close to Art
>for me!

:D

>Really good job!

Thanks.

>And what about lightwave[6]?

I won't be getting it for another while yet. Hopefully, it won't be that
long.


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From: Nathan Kopp
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 15 May 2000 20:29:32
Message: <3920966c$1@news.povray.org>
Phil Clute <pcl### [at] tiacnet> wrote...
> I like the goldish color. I fiddled with radiosity earlier this
> week but it kept getting stuck half way through the render. 

It shouldn't do that anymore with MegaPov 0.5.  ;-)

-Nathan


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From: Greg M  Johnson
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 17 May 2000 08:24:13
Message: <39228E64.4417F18D@my-dejanews.com>
whewdoggeee!

TonyB wrote:

>  [Image]


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From: Nathan Kopp
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 18 May 2000 00:33:05
Message: <39237281@news.povray.org>
I like the eye-logo in the corner.  :-)

-Nathan

TonyB <ben### [at] panamac-comnet> wrote...
> I've been in the radiosity mood lately, so I decided to do something about
> it. Inspired by the recent images of outdoor radiosity by Fabian Brau, I
set
> to do something similar myself. Then I remembered that I'm not good at
> texturing (yet), so I did something simple, then I played with textures a
> bit more, and got something better. Two notes:


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From: TonyB
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 18 May 2000 01:22:00
Message: <39237df8@news.povray.org>
>I like the eye-logo in the corner.  :-)

I'm glad you do. I was field-testing it. :) BTW, do you feel that the
caustics made any difference on the floor? I'm beginning to doubt any real
change. Also, do you have any suggestion for increasing the visibility of
reflective caustics? I tried this on a white plane, and they were barely
visible (from the cylinder). Thanks.


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From: Nathan Kopp
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 18 May 2000 10:23:49
Message: <3923fcf5$1@news.povray.org>
TonyB <ben### [at] panamac-comnet> wrote...
> >I like the eye-logo in the corner.  :-)
>
> I'm glad you do. I was field-testing it. :) BTW, do you feel that the
> caustics made any difference on the floor? I'm beginning to doubt any real
> change. Also, do you have any suggestion for increasing the visibility of
> reflective caustics? I tried this on a white plane, and they were barely
> visible (from the cylinder). Thanks.

Caustics from the floor will make little difference in this scene, because
they will be overpowered by the direct light.  Even the light contribution
from diffuse interaction (radiosity) will probably be brighter than what
comes from the photons.  If you want to, try rendering it both ways and then
do a difference on the two images to see how much light the photons
contribute.  Personally, I'd find that very interesting.

The reflective caustics from the cylinder, unfortunately, will always be
very dim.  The shape of the cylinder disperses the light, so that it is much
dimmer and is drowned out by the direct light.  That kind of reflective
caustic is generally only visible if it reflects into a shadow, and even
then it is dim because the light energy is spread out over a large area.

-Nathan


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From: TonyB
Subject: Re: Radiosity and caustics, a test (~100kau)
Date: 18 May 2000 10:33:40
Message: <3923ff44@news.povray.org>
>If you want to, try rendering it both ways and then
>do a difference on the two images to see how much light the photons
>contribute.  Personally, I'd find that very interesting.

Thanks for the explanation. I will try what you suggest. Let's see what
happens. :)

>The reflective caustics from the cylinder, unfortunately, will always be
>very dim.  The shape of the cylinder disperses the light, so that it is
much
>dimmer and is drowned out by the direct light.  That kind of reflective
>caustic is generally only visible if it reflects into a shadow, and even
>then it is dim because the light energy is spread out over a large area.

Interesting. OK. Thanks. :)


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From: TonyB
Subject: Difference (<12kau)
Date: 18 May 2000 18:35:57
Message: <3924704d@news.povray.org>
>If you want to, try rendering it both ways and then
>do a difference on the two images to see how much light the photons
>contribute.  Personally, I'd find that very interesting.

Here it is. Apparently, there were some differences. Especially on the cube.
I hope this enlightens you. :)


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