Couple tuts http://www.moddb.com/games/cc-renegade/tutorials/lightmap-tutorial (except don't set Flatten Map spacing to 0!) http://www.translucency.com/araya/
Mini Tutorial: * Apply a Unwrap UVW modifier. (Make sure the channel is set to 1), save your layout as UV1 * Apply a second Unwrap UVW modifier on top (technically you could do it all in one modifier but I've hit too much bugginess switching channels.) * Change the channel to 2, click Edit * In the Editor window go to Face…