I think were Vue is lacking and the others are not is the maximising of the GPU not the CPU, Vue only uses the CPU for rendering and the GPU for OpenGL pre-view, yet the GPU is far superior for rendering especially now DirectX 10 enables many realtime effects, NVidia has all the libriaries for free if any programmer wishes to integrate them into their program, they even have a free renderer called Galaxo on their site, just check-out their demos, real-time hair underwater, realtime SSS, realtime HDRI etc etc., the GPU is the way forward and has been for the last few years for games companies, some great reasoning on this thread. Chris.