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"Chris Huff" <chr### [at] mac com> wrote in message
news:chrishuff-8AD3E9.18301804092000@news.povray.org...
| In article <39B41E84.4C0E6F0C@spiritone.com>, Josh English
| <eng### [at] spiritonecom> wrote:
|
| > Is there a slow down in rendering with a lot of these things? If I
| > tried to do this with light sources that fade out it would take
| > forever,
|
| There is a slow down when using larger numbers of glows, but they do
| render very quickly. The only scene I noticed a significant slow down in
| was the tree scene
Aww, and I started to think that my unfinished Christmas tree might be
finished this year :-(
It could still work well though because using only a few strategically
placed colored lights could do fine for making the illumination on walls
etc.
It's really the number of pine needles, or the way I applied them, that is a
major drawback parse-wise for that particular tree.
These glow example images are tremendous btw. Seems people might have done
the same with media and lights before but these images have a quality all
there own. A frosted glass between camera and subject kind of way.
Bob
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On Sun, 03 Sep 2000 10:53:12 -0500, Chris Huff wrote:
>In article <39b25901$1@news.povray.org>, "Rune"
><run### [at] inamecom> wrote:
>
>> How does it look when located extremely close to a surface? (Is only
>> part of the glow visible, as it should?)
>
>If nothing is between the glow and the camera, the whole thing is
>visible. Proximity to a surface does not and should not affect it, since
>it simulates atmospheric scattering, not a ball of glowing gases.
But some part of the glow comes from backscattering from the gases behind
the horizon of the surface. The glow really should be ever-so-slightly
darker for rays that hit the surface partway into the glow. To prove it to
yourself, render an image that uses scattering media and another that uses
glow and compare.
--
Ron Parker http://www2.fwi.com/~parkerr/traces.html
My opinions. Mine. Not anyone else's.
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From: Mark Wagner
Subject: Re: More glow stuff - attached files (1/1)
Date: 6 Sep 2000 01:35:10
Message: <39b5d78e@news.povray.org>
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Do glows have bounding boxes/spheres to speed up rendering? Are they part
of the bounding box hierarchy?
Mark
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From: Mark Wagner
Subject: Re: More glow stuff - attached files (1/1)
Date: 7 Sep 2000 02:54:17
Message: <39b73b99@news.povray.org>
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Chris Huff wrote in message ...
>In article <39b5d78e@news.povray.org>, "Mark Wagner"
><mar### [at] gtenet> wrote:
>
>> Do glows have bounding boxes/spheres to speed up rendering?
>
>No.
>
>
>> Are they part of the bounding box hierarchy?
>
>No.
Would it be practical to work out a way of bounding glows in order to add
them to the hierarchy and speed up rendering?
Mark
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"Chris Huff" wrote:
> > Would it be practical to work out a way of bounding glows in
> > order to add them to the hierarchy and speed up rendering?
>
> No.
> As they are now, they are very fast: you can have thousands of
> them with only a small impact on render time
Just remember that "turbulence 0" will *not* be ignored, so if you don't use
turbulence be sure to remove it completely! After I figured that out I
didn't think much about speed issues anymore...
Rune
--
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/ The POV Desktop Theme, and The POV-Ray Logo Contest can
\ all be found at http://rsj.mobilixnet.dk (updated July 23)
/ Also visit http://www.povrayusers.org
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