That's a good idea - though I'd hate to think of the number of lights
created for a 1024x768 image... :)

I'm wondering if there's a way to crank up the ambient value of the sky
sphere, perhaps after darkening the 'dark' parts of the image, so that the
end result is an approximation of an HDR radiosity solution.  Right now when
I use a sky sphere, it gives a nice effect, but the effect is too subtle.

Perhaps adjusting the contrast (keep the bright parts bright, darken the
rest) of an image, then setting its ambient value to 10, would do the trick
and could simulate an HDR image.  I'll have to experiment, it probably
depends upon which image is used.

JP


"Daniel Matthews" <dan#@3-e.net> wrote in message
news:100### [at] 3-enet...
> Something more complex than mapping the image to a sky sphere?
> Such as converting the image to an array of light sources distributed over
a
> sphere? There are examples of both pixel data to object conversions and
> spherical distribution of objects, you will need to look through the older
> news post to find them, both are in the last 6 months.
> There is also a Lighting inc that could be upgraded to perform such
> lighting.
>
> John Pallett wrote:
>
> >
> > Is there a way to coerce POV-Ray 3.5 into doing this without the patch?
> > Perhaps a pre-processing step on the HDR image and then the appropriate
> > radiosity parameters?
> >
> > JP
> >
> > "Gilles Tran" <git### [at] wanadoofr> wrote in message
> > news:3e04e8bf@news.povray.org...
> >> Here are some tests of the HDRI (high dynamic range illumination) patch
> >> by Mael.
> >> The model is the Lego Ferrari by Kenneth Storm (see  the p.b.i thread
> > "Lego
> >> Ferrari" on Sept 2).
> >> The HDR maps are those available at Paul Devebec's site (I put the
probes
> >> name for reference) http://www.debevec.org
> >> There's nothing much to it actually : just the HDR map, no lights, same
> >> standard radiosity parameters. There are some visible artefacts in the
> > maps
> >> that have many strong light sources (like the Galileo probe), but the
way
> >> the HDR map seems to replace light sources is really amazing (apart the
> > lack
> >> of specular highlights, of course).
> >> I still have to test it on "real" scenes though, where the illumination
> > also
> >> comes from regular objects. I really can't take credit for anything in
> > these
> >> tests ! Before I tested it, I couldn't figure out whether HDRI was
really
> >> better than plain radiosity, but it really is.
> >> Important note : the patch is not publicly available yet (there's a
> > Megapov
> >> version somewhere) but I hope that Mael will release it soon.
> >>
> >> G.
> >>
> >> --
> >> **********************
> >> http://www.oyonale.com
> >> **********************
> >> - Graphic experiments
> >> - POV-Ray and Poser computer images
> >> - Posters
> >>
> >>
> >>
> >>
>
> --
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>

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