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From: Marc-Hendrik Bremer
Subject: Photons extremly slow under beta 7 icl
Date: 30 Oct 2001 16:35:13
Message: <3bdf1d11@news.povray.org>
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Hi!
There seems to be something wrong with the Intel compile. The scene I'm
working on took about 6 minutes to compute photons (count 200000) under beta
6. With beta 7 it took over 20 minutes until the status bar showed something
like "this=500 total= 10454 ..." (values might vary a bit). The msvc version
seems to be a bit faster, but it's running at the moment, so I don't know
yet for sure. It displays "this=400, total 6189" after 7 minutes.
Can someone else verify this? Please don't say I have to wait a month (or
even more) to use photons again!
Marc-Hendrik
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From: Marc-Hendrik Bremer
Subject: Re: Photons extremly slow under beta 7 icl
Date: 30 Oct 2001 17:10:14
Message: <3bdf2546@news.povray.org>
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I'm still using my PII 450, 128 MB and Pov beta 7 (both compiles) :-)
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From: Nathan Kopp
Subject: Re: Photons extremly slow under beta 7 icl
Date: 30 Oct 2001 19:17:34
Message: <3bdf431e@news.povray.org>
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"Marc-Hendrik Bremer" <Mar### [at] t-online de> wrote...
> Hi!
>
> There seems to be something wrong with the Intel compile. The scene I'm
> working on took about 6 minutes to compute photons (count 200000) under
beta
> 6. With beta 7 it took over 20 minutes until the status bar showed
something
> like "this=500 total= 10454 ..." (values might vary a bit). The msvc
version
> seems to be a bit faster, but it's running at the moment, so I don't know
> yet for sure. It displays "this=400, total 6189" after 7 minutes.
>
> Can someone else verify this? Please don't say I have to wait a month (or
> even more) to use photons again!
Does your scene contain isosurfaces? How does render time compare with
photons disabled? (Photons are simply rays traced into the scene from the
light sources, so the problem may be caused by slower ray-intersection
tests.)
-Nathan
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On Tue, 30 Oct 2001 19:19:33 -0500, "Nathan Kopp" <nat### [at] koppcom>
wrote:
>Does your scene contain isosurfaces? How does render time compare with
>photons disabled? (Photons are simply rays traced into the scene from the
>light sources, so the problem may be caused by slower ray-intersection
>tests.)
But Nathan, Marc wrote that the same render was three times faster
with beta 6. Maybe it has to do with the iso changes in the core?
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG e-mail : pet### [at] tagpovrayorg
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On Wed, 31 Oct 2001 04:47:51 +0200, Peter Popov <pet### [at] vipbg> wrote:
>But Nathan, Marc wrote that the same render was three times faster
>with beta 6. Maybe it has to do with the iso changes in the core?
Sorry about the wild guessing bit, apparently Thorsten attributes it
to evaluate.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG e-mail : pet### [at] tagpovrayorg
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From: Marc-Hendrik Bremer
Subject: Re: Photons extremly slow under beta 7 icl
Date: 31 Oct 2001 02:59:00
Message: <3bdfaf44@news.povray.org>
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Nathan Kopp schrieb in Nachricht <3bdf431e@news.povray.org>...
>
>"Marc-Hendrik Bremer" <Mar### [at] t-onlinede> wrote...
>Does your scene contain isosurfaces? How does render time compare with
>photons disabled? (Photons are simply rays traced into the scene from the
>light sources, so the problem may be caused by slower ray-intersection
>tests.)
>
>-Nathan
>
Hi!
Yes, there is one Iso in the scene, but evaluate is not used. The rendertime
even without photons is way up. The scene used to render in about half an
hour (34 min IIRC). Yesterday I stooped it after 1h 5min. It renders about
1/3 of the image (640x480 pixel). The Isosurface is further "down" the image
and the upper part used to be the faster one. I would estimate that this
render takes about 7 to 8 times as long.
I hoped that there are just some debug options left on in this beta, but it
seems it's not this trivial.
Marc-Hendrik
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From: Thorsten Froehlich
Subject: Re: Photons extremly slow under beta 7 icl
Date: 31 Oct 2001 04:04:37
Message: <3bdfbea5@news.povray.org>
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In article <3bdfaf44@news.povray.org> , "Marc-Hendrik Bremer"
<Mar### [at] t-onlinede> wrote:
> Yes, there is one Iso in the scene, but evaluate is not used. The rendertime
> even without photons is way up.
Well, if you remove the isosurface, is it still slower?
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: Marc-Hendrik Bremer
Subject: Re: Photons extremly slow under beta 7 icl
Date: 31 Oct 2001 04:23:50
Message: <3bdfc326@news.povray.org>
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Thorsten Froehlich schrieb in Nachricht <3bdfbea5@news.povray.org>...
>Well, if you remove the isosurface, is it still slower?
Okay, that's it! I had a second look at my include file and "evaluate" was
used in it. Without the Iso, or without "evaluate" everything seems to work
at normal speed.
Thanks,
Marc-Hendrik
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