In article <3c80f917$1@news.povray.org>, "Hugo" <hua### [at] post3teledk> 
wrote:

> Yes it's possible. But it will slow down rendering, depending on how
> accurate you want the light to reflect. In some cases it's awfully slow, but
> usually not. The feature is called radiosity. This causes all objects to
> reflect light, and not just the mirror. But you can adjust how many times
> the light will reflect (once might be just enough).

Radiosity is not what he wants. Radiosity simulates diffuse reflection, 
like light bouncing off a lampshade or white walls. You might get 
something vaguely like caustics with effort, but that's not what the 
algorithm is designed for, so it won't be very efficient.


> MegaPOV and Pov3.5beta also have a feature called "photons" that makes
> caustics on specific objects. It's not the same as radiosity. It's only for
> glassy objects. I don't have much luck or experience with photons, but other
> people have. Maybe they'll post here too.

Photons work on any reflective or refracting object, not just glassy 
ones, and are specifically designed for the situation he has in mind.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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