my bad english can't help me to explain well my opinion... but i will try however... 1 - i agree with JC, Radiosity is everywhere, imagine a white room with red carpet, and the light of sun come from a window and hit the carpet... what do you think that can happen in the white room ? some red and "pink" artfact go around the room ? well this is one of the effect of GR... 2 - about your image JC... i'm not sure about the realism of your work (don't be offended ! you are doing and incredible work and a very professional tutorial...) but, imho, in the specific image of this post the result is not so good... in real world, is very hard to see the green color of leaves "reflected" as your image, and in general the light is too Strong and cold... by the way, i think the rendering engine of GR in vue will be improved in next release, i prefer use only the GI, not so satisfied both of performance (to slow) and result (to "unreal" in many cases)... Bye Luca.