Smart thinking - I'll have to give that a try.  :)

JP

"Daniel Matthews" <dan#@3-e.net> wrote in message
news:197### [at] 3-enet...
> For lighting (rather than reflection mapping) you would not need more than
> the brightest 10% of pixels in the image, these could be lights behind a
> translucent sphere that held the matching image map so that you still had
> reflection/environment mapping. The lights would need to be directed at
the
> center of the sphere so as to avoid them illuminating the dark parts of
the
> map/sky.
>
> John Pallett wrote:
>
> > 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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