Since Les asked what radiosity is, I'll just point out a little terminology thing. No offense intended, Paul. "Radiosity" is a word that comes from physics and it refers to the tendency of an object to re-emit light that has fallen on it as well as to emit light of its own depending on its temperature. In the 3D context, radiosity means that light on an object comes not only directly from the lights in your scene but also arrives at the object as a result of having first bounced off other objects. In real life if you hold up a large green object, such as a green towel, close to your face and look in the mirror, you'll see that the side of your face close to the towell looks a little greenish. That's radiosity. Light is bouncing off the towel, being turned green in the process, then hitting your face. It's a subtle effect, but you'll see it if you look hard enough and compare different coloured objects. In a room at night, the fact that you can see the sides of objects that are facing away from all of the lights in your room is purely a result of radiosity. Because Radiosity is closely related to global illumination (lighting where the light seems to come from all directions) the two terms are often confused. "Global Illumination Lights" would probably be a more accurate name for Paul's light set.

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