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It seems that the smaller the error_bound value, the more likely you'll
get odd-looking radiosity artifacts in corners. Is this so? And what can
be done about it?
The bad thing about specifiying a larger error_bound (1 or larger) is that
you don't get the natural darkening in the corners as you should.
--
char*i="b[7FK@`3NB6>B:b3O6>:B:b3O6><`3:;8:6f733:>::b?7B>:>^B>C73;S1";
main(_,c,m){for(m=32;c=*i++-49;c&m?puts(""):m)for(_=(
c/4)&7;putchar(m),_--?m:(_=(1<<(c&3))-1,(m^=3)&3););} /*- Warp -*/
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From: Christoph Hormann
Subject: Re: Small error_bound increases artifacts?
Date: 16 Mar 2001 10:11:51
Message: <3AB22D36.5A96874@gmx.de>
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Warp wrote:
>
> It seems that the smaller the error_bound value, the more likely you'll
> get odd-looking radiosity artifacts in corners. Is this so? And what can
> be done about it?
If you use the same 'count' value, this is natural, decreasing error_bound
nearly always requires higher count values (nearest_count could help in
some cases too).
It also seems obvious to me that corners are preferred places for
persistent artefacts.
One thing that often bothers me a bit are certain structures on outside
corners like in:
http://www.schunter.etc.tu-bs.de/~chris/pov/radB_X.jpg
Christoph
--
Christoph Hormann <chr### [at] gmx de>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
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Warp wrote:
>
> It seems that the smaller the error_bound value, the more likely you'll
> get odd-looking radiosity artifacts in corners. Is this so? And what can
> be done about it?
> The bad thing about specifiying a larger error_bound (1 or larger) is that
> you don't get the natural darkening in the corners as you should.
>
Hi.
I have been applying this "rule" with some success. If you set the
error_bound value to x, then set the low_error_factor to x/8 or x/10.
The rule fails if the error_bound is to small though.
Hope this may help.
Alberto.
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In other words, I agree with you in the sense that the lower the
error_bound, the greater the probability you'll get radiosity artifacts.
Alberto.
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> One thing that often bothers me a bit are certain structures on outside
> corners like in:
I don't see anything wrong... would you mind circling the trouble spot?
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From: Christoph Hormann
Subject: Re: Small error_bound increases artifacts?
Date: 17 Mar 2001 11:23:19
Message: <3AB38F78.64E3CEE0@gmx.de>
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"Tony[B]" wrote:
>
> I don't see anything wrong... would you mind circling the trouble spot?
I meant the lower right near corner of the 'box', the floor is very bright
directly at the corner and gets darker to both sides.
It's better visible in:
http://www.schunter.etc.tu-bs.de/~chris/pov/radtest01.png
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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OK. Now I see it. That is an effect I too have noticed. Use a high enough
count and it disappears. :\
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