Make sure watch until the gun part.
[youtube:http://www.youtube.com/watch?v=Gnq-8iaOcXk]
Information from the video:
A renderer for Quake 3 Arena maps in immersive environments, based on the Aftershock rendering engine and the CaveQuake wrapper. Shown here in the UC Davis KeckCAVES facility . The video was shot with a tripod-mounted video camera from outside the CAVE.