This one is a demo / test render, that utilizes  Refgen. The  Cornell box (above) is widely used to compare/show radiosity results. This time, the radiosity is fake. The scene uses only regular lightwave spotlights, with shadows turned off. The areas that LOOK like shadows, are actually just spotlights with a negative value and soft cone angle - yes, this method only works with spheres ;-) There are wide angle spotlights representing each of the walls (and the light in the top). The caustics hot spot was done with two spots with a little different cone angles to have better looking falloff. The reflection in the balls is courtesy of refgen - that's why this image is here ,-) Refraction was done with the aid of refgen too - The refgen-created image was used as a reflection image for the INNER, flipped polys of the ball - looks surprisingly real... of course, one can't change the refraction value in this case ;-) L6 Gradients were used to control the amount of reflection, but this could have been done just as well with 5.6 and fresnel plugin. As there's no ray tracing or caustics, the scene renders FAST - 36 seconds (low enh AA) on a p2 350 (L6.0). The image above left is a Lightscape render (by CoolColJ) i used as a reference. On the right is the fake once again.