In article <3e21b1b3$1@news.povray.org>,
 "Mark Hanson" <mar### [at] attbicom> wrote:

> "Christopher James Huff" <cja### [at] earthlinknet> wrote in message
> news:cja### [at] netplexaussieorg...
> > An HDRI image can be used to store lighting values for a scene, either
> > precomputed ahead of time or taken from a real-world sample. Since the
> > lighting values already exist, it doesn't take as long as having the
> > actual scenery there, it is easier to set up, and the lighting is more
> > realistic than a background from an ordinary image, with color values
> > clipped to a small range.
> 
> Where does the scene come from? A scene you've already rendered? From
> reading a few of the posts in p.b.i., it seemed like they were photographs.
> Is that it?

"either precomputed ahead of time or taken from a real-world sample."

It doesn't really matter where it originally came from...could be 
generated with a high-quality renderer, could be taken from a real-world 
location. If the patch allows POV to output images in that format, you 
could generate the images with POV. Then you would have to do the work 
of setting up the scenery, but you would only have to do that and render 
once, and could use the resulting HDRI map in several other scenes, or 
to make a faster rendering animation. Most HDRI maps seem to be 
real-world samples, probably because there isn't much rendering software 
that can output to those images. I think Radiance can do it, or it might 
just use its own RGBE format.

-- 
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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