Bizarre Creations and 7 Studios (2011) Budcat, Underground, Luxoflux and RedOctane (2010) Shaba and Sierra (2009 / 2008 ) Yeah, squeaky clean track record there ;)
http://www.polycount.com/forum/showpost.php?p=1366692&postcount=7 Yeah it only works if you RTT a copy of your object with the normal in the bump channel.
I UV'd the wheel and slapped a displacement map on it. the only downside is that i need to crank the smoothing to 6 or 7 iterations for it to actually work properly :P
Just finished the game, got 90% completing after 20 hours of gameplay. Solid 7/10 for gameplay, can't wait for the sequel that will improve on everything.