C&C Renegade was not built using the quake 3 engine. The engine was totally made by westwood. The quake3 engine can't handle the transistions between outdoors and indoors. Anyway the quake 3 engine, is just the quake 2 engine, which is the quake engine!! or something like that.
I've only played the demo of renegade, and it was an awsome game. Much more fun then TFC. I'rd buy it but I don't have the money
sarujin