Filming avatar

Filming

Principal photography for Avatar began in April 2007 in Los Angeles and Wellington, New Zealand. Cameron described the film as a hybrid with a full live-action shoot in combination with computer-generated characters and live environments. "Ideally at the end of the day the audience has no idea which they're looking at," Cameron said. The director indicated that he had already worked four months on nonprincipal scenes for the film.[82] The live action was shot with a modified version of the proprietary digital 3-D Fusion Camera System, developed by Cameron and Vince Pace.[83] In January 2007, Fox had announced that 3-D filming for Avatar would be done at 24 frames per second despite Cameron's strong opinion that a 3-D film requires higher frame rate to make strobing less noticeable.[84] According to Cameron, the film is composed of 60% computer-generated elements and 40% live action, as well as traditional miniatures.[85] Additional live action elements were filmed at Kerner Studios on Kernercam 3D systems and RED cameras.[85]

Motion-capture photography lasted 31 days at the Hughes Aircraft stage in Playa Vista in Los Angeles.[53][86] Live action photography began in October 2007 at Stone Street Studios in Wellington, New Zealand, and was scheduled to last 31 days.[87] More than a thousand people worked on the production.[86] In preparation of the filming sequences, all of the actors underwent professional training specific to their characters such as archery, horseback riding, firearm use, and hand-to-hand combat. They received language and dialect training in the Na'vi language created for the film.[88] Prior to shooting the film, Cameron also sent the cast to the jungle in Hawaii[89] to get a feel for a rainforest setting before shooting on the soundstage.[88]
The virtual camera system in use on the set of the film. The motion-capture stage known as "The Volume" can be seen in the background.

During filming, Cameron made use of his virtual camera system, a new way of directing motion-capture filmmaking. The system is showing the actors' virtual counterparts in their digital surroundings in real time, allowing the director to adjust and direct scenes just as if shooting live action. According to Cameron, "It's like a big, powerful game engine. If I want to fly through space, or change my perspective, I can. I can turn the whole scene into a living miniature and go through it on a 50 to 1 scale."[90] Using conventional techniques, the complete virtual world cannot be seen until the motion-capture of the actors is complete. Cameron said this process does not diminish the value or importance of acting. On the contrary, because there is no need for repeated camera and lighting setups, costume fittings and make-up touch-ups, scenes do not need to be interrupted repeatedly.[91] Cameron described the system as a "form of pure creation where if you want to move a tree or a mountain or the sky or change the time of day, you have complete control over the elements".[92]

Cameron gave fellow directors Steven Spielberg and Peter Jackson a chance to test the new technology.[64] Spielberg said, "I like to think of it as digital makeup, not augmented animation.... Motion capture brings the director back to a kind of intimacy that actors and directors only know when they're working in live theater."[91] Spielberg and George Lucas were also able to visit the set to watch Cameron direct with the equipment.[93]

To film the shots where CGI interacts with live action, a unique camera referred to as a "simulcam" was used, a merger of the 3-D fusion camera and the virtual camera systems. While filming live action in real time with the simulcam, the CGI images captured with the virtual camera or designed from scratch, are superimposed over the live action images as in augmented reality and shown on a small monitor, making it possible for the director to instruct the actors how to relate to the virtual material in the scene.[88]





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