Very similar, in fact, to a convolution reverb, which samples the ambience
of a space and applies that to a sound recording, given the recording the
illusion of being in the space.
D.

"Christopher James Huff" <cja### [at] earthlinknet> wrote in message
news:cja### [at] netplexaussieorg...
> In article <3e205225$1@news.povray.org>,
>  "Mark Hanson" <mar### [at] attbicom> wrote:
>
> > I've been away from playing with Pov-Ray for a few years, so I haven't
heard
> > about this utility. Some of the pictures I've seen in p.b.i. are
stunning --
> > they look like photographs. I'm certainly not looking for advice on how
to
> > use it (I'm back up to the point where I can make a scene with spheres
and
> > boxes without screwing up :-) ), just a sort of basic explanation of
what it
> > is, and how it works. Thanks.
>
> Basically, to make a really realistic scene, it helps for your objects
> to have realistic surroundings and lighting, especially for things like
> reflections. You can construct this environment entirely in the
> computer, having the computer actually simulate the entire scene, but
> this takes memory, computation time, and is difficult or just time
> consuming.
>
> HDRI means High Dynamic Range Image. Usually, image color values are
> percentages, you can have 0%, 100%, and steps in between. Of course, in
> reality, there is no "100% brightness", it is just a compromise for what
> our display devices can show. High dynamic range images store
> intensities instead of percentages, and can store values brighter than
> "white".
>
> 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.
>
> --
> 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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