As James Cameron's 3D epic Avatar surpasses record after record for a newly-released film, many in Hollywood are looking for the next big film. A few years ago it was teen wizards. Last summer it was sparkling vampires.
2009 may well be known as the year virtual worlds got their big-screen endorsement.
Pixels and Policy looks back at how three major films explored virtual reality and attracted new converts to the world of interactive synthetic environments.