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From: Nathan Kopp
Subject: Re: sphere sweep bounding boxes calculated incorrectly
Date: 13 Jan 2002 17:22:56
Message: <3c4208c0$1@news.povray.org>
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"Slime" <noo### [at] hotmail com> wrote...
>
> Confirmation?
Yes.
This is the same bug that can cause radiosity to be calculated incorrectly
for sphere sweeps! Note that setting Bounding_Threshold to zero in the INI
file (or command line) will "fix" the problem.
-Nathan
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From: Thorsten Froehlich
Subject: Re: sphere sweep bounding boxes calculated incorrectly
Date: 13 Jan 2002 17:40:19
Message: <3c420cd3@news.povray.org>
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In article <3c4208c0$1@news.povray.org> , "Nathan Kopp" <nat### [at] koppcom>
wrote:
> This is the same bug that can cause radiosity to be calculated incorrectly
> for sphere sweeps! Note that setting Bounding_Threshold to zero in the INI
> file (or command line) will "fix" the problem.
Ah, good to know that my change in beta 10 then corrected that bug.
However, why does radioity depend on a tight bounding box...?
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: Nathan Kopp
Subject: Re: sphere sweep bounding boxes calculated incorrectly
Date: 13 Jan 2002 23:25:07
Message: <3c425da3$1@news.povray.org>
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"Thorsten Froehlich" <tho### [at] trfde> wrote...
> > This is the same bug that can cause radiosity to be calculated
incorrectly
> > for sphere sweeps! Note that setting Bounding_Threshold to zero in the
INI
> > file (or command line) will "fix" the problem.
>
> Ah, good to know that my change in beta 10 then corrected that bug.
> However, why does radioity depend on a tight bounding box...?
You know, I don't really know. That radiosity code is still a bit of a
mystery in some places. All I know is that the bounding problems were
causing problems with radiosity, and fixing the bounding problems (by using
Bounding_Threshold=0) fixed the radiosity problems in my tests.
I just tested the latest version and it seems that the radiosity problem is
also now solved for sphere sweeps.
-Nathan
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Wasn't it Nathan Kopp who wrote:
>
>"Slime" <noo### [at] hotmailcom> wrote...
>>
>> Confirmation?
>
>Yes.
>
>This is the same bug that can cause radiosity to be calculated incorrectly
>for sphere sweeps! Note that setting Bounding_Threshold to zero in the INI
>file (or command line) will "fix" the problem.
On my machine, setting bounding_threshold to zero causes scenes that
contain no objects to crash. [I wonder if this is the missing ingredient
which causes some people to have all their objectless scenes crash -
perhaps they have bounding_threshold=0 in their ini file for some
reason.]
It also doesn't "fix" the problem that the min_extent (or max_extent) of
the sphere sweep always includes <0,0,0>.
--
Mike Williams
Gentleman of Leisure
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From: Thorsten Froehlich
Subject: Re: sphere sweep bounding boxes calculated incorrectly
Date: 14 Jan 2002 07:21:05
Message: <3c42cd31$1@news.povray.org>
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In article <+cfY### [at] econymdemoncouk> , Mike Williams
<mik### [at] nospamplease> wrote:
> It also doesn't "fix" the problem that the min_extent (or max_extent) of
> the sphere sweep always includes <0,0,0>.
Yes, that is to be expected because the bounding box is an object property,
and bounding only makes additional use of this property, so it is always
available, regardless of the use of bounding boxes for acceleration.
Thorsten
____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde
Visit POV-Ray on the web: http://mac.povray.org
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