POV-Ray: Newsgroups: povray.general: Calculating the View Factor?

POV-Ray : Newsgroups : povray.general : Calculating the View Factor?		Server Time 5 Aug 2024 10:24:44 EDT (-0400)

From:
Subject: Calculating the View Factor?
Date: 24 Oct 2002 09:38:33
Message: <3db7f7d9$1@news.povray.org>

Hi,
is it possible to calculate the view factor for all objects? I want to
calculate the "radiation-heat-transfer" from one object to another.
Thanks, Fabian

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From: Christoph Hormann
Subject: Re: Calculating the View Factor?
Date: 24 Oct 2002 11:06:28
Message: <3DB80C74.F5D91A94@gmx.de>


> 
> Hi,
> is it possible to calculate the view factor for all objects? I want to
> calculate the "radiation-heat-transfer" from one object to another.
> Thanks, Fabian

This has nothing to do with POV-Ray and raytracing but the only
practicable way i know of calculating view factors for arbitrary
geometries is the FEM based approach and since shapes in POV-Ray are not
triangle based in general there isn't any easy way of doing this.

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
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Last updated 13 Aug. 2002 _____./\/^>_*_<^\/\.______

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From: Le Forgeron
Subject: Re: Calculating the View Factor?
Date: 24 Oct 2002 11:14:27
Message: <3DB80E6F.6030009@free.fr>

Christoph Hormann wrote:

> 

> 
>>Hi,
>>is it possible to calculate the view factor for all objects? I want to
>>calculate the "radiation-heat-transfer" from one object to another.
>>Thanks, Fabian
>>
> 
> This has nothing to do with POV-Ray and raytracing but the only
> practicable way i know of calculating view factors for arbitrary
> geometries is the FEM based approach and since shapes in POV-Ray are not
> triangle based in general there isn't any easy way of doing this.
> 


What about using photons and counting ?
No... just a silly thought...

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From: Ive
Subject: Re: Calculating the View Factor?
Date: 24 Oct 2002 11:24:37
Message: <3db810b5$1@news.povray.org>


> Hi,
> is it possible to calculate the view factor for all objects? I want to
> calculate the "radiation-heat-transfer" from one object to another.
> Thanks, Fabian
>

I guess you are talking about the *form* factor calculation for radiosity.
But even if this is true, I do not understand your question..
POV has already a method to calculate radiosity implemented.

-Ive

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From:
Subject: Re: Calculating the View Factor?
Date: 24 Oct 2002 16:41:56
Message: <3db85b14$1@news.povray.org>

> I guess you are talking about the *form* factor calculation for radiosity.
> But even if this is true, I do not understand your question..
> POV has already a method to calculate radiosity implemented.
>
> -Ive

To calculate the total heat-transfer I need the parts for conduction,
convection and radiation. The radiation heat from one area to a second
results in the product of the average view factor and the area. With the
view factor only the areas, which are seen by an object, were considered; so
objects(areas) in the shadow of one view point were neglected.

My idea is now to change the view-point to every (almost every) point of the
scene and calculate it with an area_light. The intensity of the calculated
area_light at every considered pixel should now respond to the "view
factors". Maybe, it is possibel to write the intensity for the areas to a
file? (How?)

Greetings Fabian

(Hopefully anybody understands my English)

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