'So if you're an architectual visualisation artist, and your client wants to use real ergo lighting solutions for an interior scene, you'd have to turn to a higher end application like 3dsMax or 3dsViz, because lower end renderers just won't produce these results' hmm well.. the Lightscape engine has Ergo Lighting.. and thats used in trueSpace 4.3 though to 6.6... (also has radiosity, volumetrics etc and a half decent modeler... but cos it's cheap ppl forget about it)