POV-Ray : Newsgroups : povray.beta-test : Radiosity and Photons broken Server Time
1 Nov 2024 15:28:41 EDT (-0400)
  Radiosity and Photons broken (Message 1 to 9 of 9)  
From: Christoph Hormann
Subject: Radiosity and Photons broken
Date: 15 Apr 2002 03:20:41
Message: <3CBA7F49.166BA12A@gmx.de>
Radiosity seems to be broken in RC1.  

Try rendering 'radiosity/radiosity.pov' as it is and with an empty
radiosity block.  With an empty block I get correct results, while the
standard settings lead to no radiosity effect (but the pretrace is done)

Photons generate a strange 'spotlight effect' (brightening around the
target objects), try 'lights/phot_met_glass.pov' for an example.

WinNT, RC1.icl, Athlon/K6


Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
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Last updated 14 Apr. 2002 _____./\/^>_*_<^\/\.______


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From: Ari-Matti Leppanen
Subject: Re: Radiosity and Photons broken
Date: 15 Apr 2002 03:44:04
Message: <3cba84c4@news.povray.org>
"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:3CBA7F49.166BA12A@gmx.de...
:
: Try rendering 'radiosity/radiosity.pov' as it is and with an empty
: radiosity block.  With an empty block I get correct results, while the
: standard settings lead to no radiosity effect (but the pretrace is
done)

Confirmed. It's the recursion_limit. Comment it and radiosity works.

: Photons generate a strange 'spotlight effect' (brightening around the
: target objects), try 'lights/phot_met_glass.pov' for an example.

Confirmed.

WinXP, RC1.icl, Athlon/Tb

Ari-Matti


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From:
Subject: Re: Radiosity and Photons broken
Date: 15 Apr 2002 06:02:54
Message: <k59lbuol0b1tr9k2b6aipnih61j0fko6ak@4ax.com>
On Mon, 15 Apr 2002 09:20:41 +0200, Christoph Hormann <chr### [at] gmxde>
wrote:
> Try rendering 'radiosity/radiosity.pov' as it is and with an empty
> radiosity block.  With an empty block I get correct results, while the
> standard settings lead to no radiosity effect (but the pretrace is done)

Could it be the same as in my observation ? Radiosity image in RC1 is darker
than in beta 16 with the same radiosity settings.

ABX


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From: Thorsten Froehlich
Subject: Re: Radiosity and Photons broken
Date: 15 Apr 2002 10:18:11
Message: <3cbae123@news.povray.org>
In article <3CBA7F49.166BA12A@gmx.de> , Christoph Hormann 
<chr### [at] gmxde>  wrote:

>
> Radiosity seems to be broken in RC1.

No, the recursion limit is off by one (or maybe even two).

For photons the error is (nearly) the same but a bit more complex.  In
general, increasing the recusion limits for each should work around the
problem (at least for radiosity).

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org


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From: Tim Nikias
Subject: Re: Radiosity and Photons broken
Date: 15 Apr 2002 12:43:37
Message: <3CBB034F.2555E230@gmx.de>
How do you change the recursion-limit for photons, when
there is no such option for it?

If you mean max_trace_level for photons, that one doesn't
work. You can set it way higher, or way lower, there's
no change.

Thorsten Froehlich wrote:

> In article <3CBA7F49.166BA12A@gmx.de> , Christoph Hormann
> <chr### [at] gmxde>  wrote:
>
> >
> > Radiosity seems to be broken in RC1.
>
> No, the recursion limit is off by one (or maybe even two).
>
> For photons the error is (nearly) the same but a bit more complex.  In
> general, increasing the recusion limits for each should work around the
> problem (at least for radiosity).
>
>     Thorsten
>

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


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From: Kari Kivisalo
Subject: Re: Radiosity and Photons broken
Date: 15 Apr 2002 13:41:31
Message: <3CBB10D4.9CE54487@luxlab.com>
Thorsten Froehlich wrote:
>
> No, the recursion limit is off by one (or maybe even two).

It's off by two.


_____________
Kari Kivisalo


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From: Mick Hazelgrove
Subject: Re: Radiosity and Photons broken
Date: 16 Apr 2002 02:12:42
Message: <3cbbc0da@news.povray.org>
I was just about to post this! changing recursion limit by 2 does seem to correct the
problem with radiosity. Will this be changed
in the next RC? back to what it was or will this now become its normal behaviour.

Mick


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From: Christoph Hormann
Subject: Re: Radiosity and Photons broken
Date: 16 Apr 2002 02:31:50
Message: <3CBBC555.A0F28317@gmx.de>
Mick Hazelgrove wrote:
> 
> I was just about to post this! changing recursion limit by 2 does seem to correct
the problem with radiosity. Will this be changed
> in the next RC? back to what it was or will this now become its normal behaviour.
> 

As Kari said, it seems to be off by 2 so you have to use 3 to get
radiosity effect at all.  Although Thorsten did not explicitly say i
suppose it will be fixed.

Christoph

-- 
POV-Ray tutorials, IsoWood include,                 
TransSkin and more: http://www.tu-bs.de/~y0013390/  
Last updated 14 Apr. 2002 _____./\/^>_*_<^\/\.______


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From: Thorsten Froehlich
Subject: Re: Radiosity and Photons broken
Date: 16 Apr 2002 04:39:54
Message: <3cbbe35a@news.povray.org>
In article <3CBBC555.A0F28317@gmx.de> , Christoph Hormann 
<chr### [at] gmxde>  wrote:

> As Kari said, it seems to be off by 2 so you have to use 3 to get
> radiosity effect at all.  Although Thorsten did not explicitly say i
> suppose it will be fixed.

This part is already fixed already and will be in the next beta.  As for the
photons problem it seems to be caused by introducing strict recusion level
checking for reflected rays.  There was a bug there before and the problem is
a completely unitended side effect of the bugfix.  Photons are surely going to
be fixed in one way or the other to work as they always did, too.

    Thorsten

____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

Visit POV-Ray on the web: http://mac.povray.org


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