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19 Nov 2024 22:29:18 EST (-0500)
  Advice on radiosity + blobs (Message 1 to 8 of 8)  
From: Greg M  Johnson
Subject: Advice on radiosity + blobs
Date: 20 Oct 2001 15:00:01
Message: <3bd1c9b1@news.povray.org>
Here is a scene with radiosity lighting (a series of high ambient
cylinders along the ceiling of the room.)

1) It's funny how "dark" these characters are.   I did not intentionally
attempt to portray African Americans here, but it's just funny how much
darker these are compared to what I would expect for ambient 1 for the
color I choose.
Q:  Is Megapov's radiosity routine inherently "darker" for blobs than
say spheres and other objects?

2) Not how the white teeth themselves are acting as a light source.
Q: Is there a way to turn this off?  I would have expected that I could
do so with ambient 0, which I am using, in the texture statement for the
teeth.

3) Yes the hands are hideous.  As Middle Aged Man would say, "I'm
working on it!"


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From: Greg M  Johnson
Subject: Re: Advice on radiosity + blobs
Date: 20 Oct 2001 15:01:30
Message: <3bd1ca0a@news.povray.org>


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From: Christoph Hormann
Subject: Re: Advice on radiosity + blobs
Date: 20 Oct 2001 15:42:24
Message: <3BD1D3BE.A934269F@gmx.de>
"Greg M. Johnson" wrote:
> 
> Here is a scene with radiosity lighting (a series of high ambient
> cylinders along the ceiling of the room.)
> 
> 1) It's funny how "dark" these characters are.   I did not intentionally
> attempt to portray African Americans here, but it's just funny how much
> darker these are compared to what I would expect for ambient 1 for the
> color I choose.
> Q:  Is Megapov's radiosity routine inherently "darker" for blobs than
> say spheres and other objects?

I see no reason why this should be.

> 2) Not how the white teeth themselves are acting as a light source.
> Q: Is there a way to turn this off?  I would have expected that I could
> do so with ambient 0, which I am using, in the texture statement for the
> teeth.

If their ambient finish is 0, they should not 'emit light'.  They look a
bit like they have ambient finish, otherwise they should look more like
the eyes.

BTW, wouldn't it look more realistic if the floor had ambient 0?

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: Greg M  Johnson
Subject: Re: Advice on radiosity + blobs
Date: 20 Oct 2001 16:09:25
Message: <3bd1d9f5@news.povray.org>
Thanks for the answers.

Christoph Hormann wrote:

> > Q:  Is Megapov's radiosity routine inherently "darker" for blobs than
> > say spheres and other objects?
>
> I see no reason why this should be.

The color is different, closer to what I expect, when I zoom in on the
characters (megapov 0.7).

> If their ambient finish is 0, they should not 'emit light'.  They look a
> bit like they have ambient finish, otherwise they should look more like
> the eyes.
>
> BTW, wouldn't it look more realistic if the floor had ambient 0?

Well, they all do.  No finish statements.


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From: Christoph Hormann
Subject: Re: Advice on radiosity + blobs
Date: 20 Oct 2001 16:19:06
Message: <3BD1DC59.3EF7613B@gmx.de>
"Greg M. Johnson" wrote:
> 
> [...]
> 
> The color is different, closer to what I expect, when I zoom in on the
> characters (megapov 0.7).
> 

That's strange.

> 
> Well, they all do.  No finish statements.

No finish means ambient 0.1 (since this is default)

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: Greg M  Johnson
Subject: Re: Advice on radiosity + blobs
Date: 20 Oct 2001 16:29:00
Message: <3bd1de8c@news.povray.org>
Christoph Hormann wrote:

> No finish means ambient 0.1 (since this is default)

I have #default {finish{ambient 0}}
This command was however not nested inside my global settings until just
now.
I "fixed" the carpetting but there's still something odd going on with that
blob mouth, even under standard light_sources.
Thanks/2

Any advice on a texture-under-radiosity-lighting for a blobby human??


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From: Christoph Hormann
Subject: Re: Advice on radiosity + blobs
Date: 20 Oct 2001 17:01:28
Message: <3BD1E647.26B2B0F@gmx.de>
"Greg M. Johnson" wrote:
> 
> [...]
> 
> Any advice on a texture-under-radiosity-lighting for a blobby human??

If you post the scene with some dummy object (no need to put in the whole
figures) i might have a look.

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: Greg M  Johnson
Subject: Re: Advice on radiosity + blobs
Date: 20 Oct 2001 22:04:38
Message: <3bd22d36@news.povray.org>
Thanks, but our discussion and my study of the code cleared up quite a few
things to the full extent I needed.
 For some reason, I actually had a pigment{White} statement in  the chin.


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