Bryce doesn't have a plug-in architecture, does it? So there is no way this guy wrote code to force Bryce to calculate a radiosity solution. Without modifying or adding to the original source code, recompiling and then redistributing the entire program, it can't happen. Just saying something is so doesn't make it so. Not to sound too skeptical here, but this whole thing looks like smoke and mirrors and that you Bryce folks are being led by the nose.