POV-Ray : Newsgroups : povray.newusers : How to make a cloudy, dull interior? Server Time
25 Dec 2024 23:12:54 EST (-0500)
  How to make a cloudy, dull interior? (Message 1 to 4 of 4)  
From: Ekki Plicht
Subject: How to make a cloudy, dull interior?
Date: 26 Aug 2002 16:05:52
Message: <3d6a8a20@news.povray.org>
Hi,
I have been playing with POV-Ray since 2 days and try to model something 
simple... 

A part of that is made of plastic or rubber, which is _nearly_ clear. The 
interior is muddy or cloudy, not transparent at all, the colors of the 
background shine through only very, very dim and roughly. The surface is 
not reflective at all.

You can find such a plastic maybe as rubber feets on small electronic 
devices or other boxes.

Which texture and interior should I use? I have been playing around with 
mostly "glass" like settings, but the results are not satisfying.

Any help?

TIA;
Ekki (Germany)


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From: Christopher James Huff
Subject: Re: How to make a cloudy, dull interior?
Date: 26 Aug 2002 20:19:15
Message: <chrishuff-73B064.20183926082002@netplex.aussie.org>
In article <3d6a8a20@news.povray.org>, Ekki Plicht <ekk### [at] plichtde> 
wrote:

> A part of that is made of plastic or rubber, which is _nearly_ clear. The 
> interior is muddy or cloudy, not transparent at all, the colors of the 
> background shine through only very, very dim and roughly. The surface is 
> not reflective at all.
> 
> You can find such a plastic maybe as rubber feets on small electronic 
> devices or other boxes.
> 
> Which texture and interior should I use? I have been playing around with 
> mostly "glass" like settings, but the results are not satisfying.

To make effects that depend on the volume of the interior instead of 
just surface texture, you need to use interior attenuation (the 
fade_power, fade_distance, and fade_color keywords) or media. For this, 
you said you wanted a cloudy look, so I would recommend scattering media 
or a combination of scattering with absorbing. There are some examples 
in the sample scenes.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/


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From: Tim Nikias
Subject: Re: How to make a cloudy, dull interior?
Date: 27 Aug 2002 00:33:06
Message: <3d6b0102@news.povray.org>
Scattering is pretty slow, and I don't know if its
overkill for that kind of object. Sticking to a mix
of absorption and emission (emission to get a
certain color, absorption to lose background color)
might do as well, and AFAIK, absorption and emission
are calculated quicker than scattering (because they're
light- and self-independant)...

--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html
Email: Tim### [at] gmxde

> To make effects that depend on the volume of the interior instead of
> just surface texture, you need to use interior attenuation (the
> fade_power, fade_distance, and fade_color keywords) or media. For this,
> you said you wanted a cloudy look, so I would recommend scattering media
> or a combination of scattering with absorbing. There are some examples
> in the sample scenes.
>


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From: Christopher James Huff
Subject: Re: How to make a cloudy, dull interior?
Date: 28 Aug 2002 18:24:23
Message: <chrishuff-D89C74.18233828082002@netplex.aussie.org>
In article <3d6b0102@news.povray.org>, "Tim Nikias" <tim### [at] gmxde> 
wrote:

> Scattering is pretty slow, and I don't know if its
> overkill for that kind of object. Sticking to a mix
> of absorption and emission (emission to get a
> certain color, absorption to lose background color)
> might do as well, and AFAIK, absorption and emission
> are calculated quicker than scattering (because they're
> light- and self-independant)...

The light interaction is the reason I suggested scattering, a 
combination of absorbing and emitting media won't give the same effect. 
It is slower, but with a constant density it isn't too bad, and it is 
the most realistic way to do it.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/


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