In digital puppetry, machinima creators become virtual actors; each crew member controls a character in real-time, as in a multiplayer game. The director can use built-in camera controls, if available. Otherwise, video is captured from the perspectives of one or more puppeteers who serve as camera operators. Puppetry allows for improvisation and offers controls familiar to gamers, but requires more personnel than the other methods and is less precise than scripted recordings. However, some games, such as the "Halo" series, (except for Halo PC and Custom Edition, which allow AI and custom objects and characters), allow filming only through puppetry. According to Marino, other disadvantages are the possibility of disruption when filming in an open multi-user environment and the temptation for puppeteers to play the game in earnest, littering the set with blood and dead bodies. However, Chris Burke intentionally hosts "This Spartan Life" in these unpredictable conditions, which are fundamental to the show. Other works filmed using puppetry are the ILL Clan's improvisational comedy series "On the Campaign Trail with Larry & Lenny Lumberjack" and Rooster Teeth Productions' "Red vs. Blue". In recamming, which builds on puppetry, actions are first recorded to a game engine's demo file format, not directly as video frames. Without re-enacting scenes, artists can then manipulate the demo files to add cameras, tweak timing and lighting, and change the surroundings. This technique is limited to the few engines and software tools that support it.