momodot opened this issue on Aug 12, 2009 · 23 posts
pjz99 posted Thu, 13 August 2009 at 6:56 AM
Oops, I knew that (Stefan Werner).
The fact that caustics is not included can throw you - if you have a completely reflective material on a surface like a square mirror, and you shine a light on it, you would expect that the mirror would reflect a bright square of illumination somewhere. It won't, that's caustics. People tend to think of caustics as the "magnifying glass" effect thrown by refraction, but it also applies to reflection.