>
> Any hints and tips on using HDRI would be very appreciated as I am not too
> sure what I am doing. (e.g. do photons work properly with HDR? do I need to
> specify anything extra you would normally add them to the light source but
> I do not know if you can add them to the HDRI light source?)
>


Your HDRI image needs to include an extremely bright spot. Then soft
caustics will happen automagically. If you want sharp, bright caustics,
you'll need to have a separate photons scene, map the photons, and use the
map in the final image. Remember, HDRI's are NOT light sources- they are
just images. As such, POV would have no way of knowing where to direct
photons from. Radiosity does, however, do soft caustics all by itself. if
you put a nice big glass sphere in a scene with a bright HDR image (try on
of the outdoor scenes Paul Debevec has up for examination), and set your
count extremely high, you'll see it.

-s
5TF!

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