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From: John Bradshaw
Subject: hdri again (a solution, not a question)
Date: 28 Feb 2002 00:41:57
Message: <3c7dc325@news.povray.org>
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I have read the previous (several) posts about hdri, know about MLPov, but
wanted to make an additional suggestion. Disclaimer: I haven't tried this
method, but it looks like it could work.
For an approximation of the lighting from an HDR lightprobe image, you can
use a plugin for HDR shop which will dump out coordinates for lights (in
several formats, but for pov most useful is probably text) that will give a
similar lighting effect to a true HDR image environment map.
I'd be interested in the results of this if anyone tries it. Hell, I may
even try it myself.
here's the link:
http://www.ict.usc.edu/~jcohen/lightgen/lightgen.html
John
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John Bradshaw wrote:
>
> For an approximation of the lighting from an HDR lightprobe image, you can
> use a plugin for HDR shop which will dump out coordinates for lights
This will probably produce smoother results when there are several
small sources in the lightprobe. Radiosity sampling will miss most
of them and the rest will produce just artefacts. Shadows may be
problematic but as this lighting is used only on objects and not on
whole scenes it't not that important.
_____________
Kari Kivisalo
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From: Christoph Hormann
Subject: Re: hdri again (a solution, not a question)
Date: 28 Feb 2002 10:10:44
Message: <3C7E4872.70C5F766@gmx.de>
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Kari Kivisalo wrote:
>
> John Bradshaw wrote:
> >
> > For an approximation of the lighting from an HDR lightprobe image, you can
> > use a plugin for HDR shop which will dump out coordinates for lights
>
> This will probably produce smoother results when there are several
> small sources in the lightprobe. Radiosity sampling will miss most
> of them and the rest will produce just artefacts. Shadows may be
> problematic but as this lighting is used only on objects and not on
> whole scenes it't not that important.
It might be useful to get halfway realistic lighting but don't want to use
radiosity. I suppose the original purpose of such a feature is to use it
in scanline renderers without shadows.
Christoph
--
POV-Ray tutorials, IsoWood include,
TransSkin and more: http://www.tu-bs.de/~y0013390/
Last updated 21 Feb. 2002 _____./\/^>_*_<^\/\.______
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Here's another interesting link.
http://positron.cs.berkeley.edu/~gwlarson/pixformat/
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