During a making-of talk at of the upcoming TRON: Legacy movie, it was revealed by the producers that the game Gears of War was used in order to practice using virtual cameras in order to shoot video.

Camera work was done using both real-world and virtual cameras. The physical cameras mentioned above were a challenge to use. In order to take in as much light as possible, the prime lenses were enormous, making the dual-camera setups difficult to move. The virtual cameras were also tricky, but they had an ace up their sleeve: they used the game Gears of War in order to practice shooting in a virtual world.

Bandrik via tech.icrontic.com »