Guest 投稿 "Probably a lot of you already know about this but it is a really interesting rendering technology. It it is not a ray tracer but a photon tracer . . . WOW! It is not 'new' but computers are getting to the more able to handle it. Here is the latest test and results. Forget caustics, try refracted light (note the prism). Look at the pics to get an idea of what it can do.