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In article <3e1c5b48@news.povray.org>,
"Apache" <apa### [at] yahoo com> wrote:
> I haven't investigated it. If 65000 samples doesn't help, we can always try
> to go to 2^32 samples :-)
Hmm...4GB per byte of sample. Stored as 3 floats, at 4 bytes each for 12
bytes a sample, that would be 48GB. If 5 bytes are sufficient, only 20GB.
And I wonder what the render times would be with 4,294,967,296
samples...the results would be really nice though. Little need for
photons, with some adjustments most other things could also be done with
this algorithm.
--
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: Christoph Hormann
Subject: Re: radiosity samples: 255x255x255 probably isn't enough
Date: 8 Jan 2003 13:46:37
Message: <3E1C720D.7EB9E792@gmx.de>
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Gilles Tran wrote:
>
> Just a general comment about this "search for more radiosity" samples, which
> I sincerely hope will be fruitful and lead to better, faster radiosity.
> In my experience, "more samples" doesn't mean "better radiosity". In fact,
> this is true between, say, 0 and 500, but after that, having more samples
> just doesn't address the artefact issues : ...
This is one of the reasons why i have been focussing on finding a better
solution for lower sample counts. With higher ray counts the differences
between distributions will diminish as long as they maintain the correct
density falloff.
Christoph
--
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 31 Dec. 2002 _____./\/^>_*_<^\/\.______
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From: Vadim Sytnikov
Subject: Re: pow()??? (Re: radiosity samples: 255x255x255 probably isn't enough)
Date: 8 Jan 2003 14:17:08
Message: <3e1c7934$1@news.povray.org>
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"Anders K." <and### [at] kaseorgcom> wrote:
> A reasonably smart compiler will optimize "src_vec->x * src_vec->x" to "x
=
> src_vec->x; x * x", but I doubt it would change "pow(x, 2)" to "x * x".
>
> Even if pow is included on the CPU, multiplication is much faster (AFAIK).
Right.
As to the direct support of pow() in the CPU, this is very and very
unlikely... Usually, pow() is implemented as a function that computes its
result using the
x ^ y == 2 ^ (y * log2(x))
formula, with *some* support for the log2(x) in the CPU (power of 2, being a
shift, is quite efficient, of course). log2(x) may easily take a hundred or
so cycles, plus those extra calculations, plus the overhead of the function
call... so, hope you got the idea.
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From: Apache
Subject: Re: radiosity samples: 255x255x255 probably isn't enough
Date: 8 Jan 2003 16:44:02
Message: <3e1c9ba2@news.povray.org>
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It's just a matter of rewriting the whole POV-Ray package and especially the
octree code so that the calculations and data can be divided over a few
thousand computers with the internet as communication medium. Maybe someone
is willing to hardcode everything into a pure POV-Ray chip? rant rant
rant.............. :-)
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From: Apache
Subject: Re: radiosity samples: 255x255x255 probably isn't enough
Date: 8 Jan 2003 16:45:31
Message: <3e1c9bfb$1@news.povray.org>
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What what would be the best (set of) scene(s) to test sets for lower sample
counts.
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From: Apache
Subject: Re: pow()??? (Re: radiosity samples: 255x255x255 probably isn't enough)
Date: 8 Jan 2003 16:46:21
Message: <3e1c9c2d@news.povray.org>
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You folks absolutely convinced me!
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From: Apache
Subject: Re: radiosity samples: 255x255x255 probably isn't enough
Date: 8 Jan 2003 21:38:00
Message: <3e1ce088$1@news.povray.org>
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I have this set ready for testing. It contains of 3200 samples. I'm
currently running some test scenes while another process is calculating a
set of 32000 samples at low priority (cygwin's nice). I have compiled a
patch of POV-Ray with those 3200 samples. The complete windows source files
(including windows executable) are available for download at
http://24.132.254.158/experiments/elipovray350winvc7src_3200samples.zip (143
kb). For those who only want to download the changed files (for all
platforms):
http://24.132.254.158/experiments/elipovray350_patched_3200samples.zip
(5,721 kb) My upstream here is 15kb/s max, so be patient if it's slow...
Please do some test, I have limited CPU power nowadays...ehhhh... as ever
:-P
Regards,
Apache
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From: Tony[B]
Subject: Re: radiosity samples: 255x255x255 probably isn't enough
Date: 8 Jan 2003 23:12:24
Message: <3e1cf6a8@news.povray.org>
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I was unable to download the first file, and the second file is source only.
--
Anthony Bennett
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From: Apache
Subject: Re: radiosity samples: 255x255x255 probably isn't enough
Date: 9 Jan 2003 04:20:23
Message: <3e1d3ed7$1@news.povray.org>
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I made some mistakes naming the files. Now you *can* download them. And I
mixed up the filesizes too! These are the right links:
http://24.132.254.158/experiments/elipovray350winvc7src_3200samples.zip
(5,721 kb)
http://24.132.254.158/experiments/elipovray350_patched_3200samples.zip (143
kb)
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From: Apache
Subject: Re: radiosity samples: 255x255x255 probably isn't enough
Date: 10 Jan 2003 17:17:00
Message: <3e1f465c@news.povray.org>
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I found a bug. The patch won't improve radiosity quality. I'm recalculating
the set (again) :-S
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