Thanks for your tips ratchet, I have added a environment mapping shader to that cobra car:



About the tank, I didn't know it was from Halo, as Rondidion put it there, but I can't find a decent free modern tank model to replace it (if someone knows about one please tell me).


And another great new! I have found the function which caused the crash when some people joined the game and fixed it, so now there shouldn't be any crash.