AVATAR

Avatar (marketed as James Cameron's Avatar) is a 2009 American epic science fiction film directed, written, produced, and co-edited by James Cameron, and starring Sam Worthington, Zoe Saldana, Stephen Lang, Michelle Rodriguez, and Sigourney Weaver. The film is set in the mid-22nd century, when humans are colonizing Pandora, a lush habitable moon of a gas giant in theAlpha Centauri star system, in order to mine the mineral unobtanium, a room-temperature superconductor. The expansion of the mining colony threatens the continued existence of a local tribe of Na'vi – a humanoid species indigenous to Pandora. The film's title refers to a genetically engineered Na'vi body with the mind of a remotely located human that is used to interact with the natives of Pandora
By 2154, humans have depleted Earth's natural resources, leading to a severe energy crisis. The Resources Development Administration, RDA for short, mines for a valuable mineral – unobtanium – on Pandora, a densely forested habitable moon orbiting the gas giant Polyphemus in the Alpha Centauri star system.[10] Pandora, whose atmosphere is poisonous to humans, is inhabited by the Na'vi, 10-foot tall (3.0 m), blue-skinned, sapient humanoids[33] who live in harmony with nature and worship a mother goddess called Eywa.
To explore Pandora's biosphere, scientists use Na'vi-human hybrids called "avatars", operated by genetically matched humans; Jake Sully, a paraplegic former Marine, replaces his deceased twin brother as an operator of one. Dr. Grace Augustine, head of the Avatar Program, considers Sully an inadequate replacement but accepts his assignment as a bodyguard. While protecting the avatars of Grace and scientist Norm Spellman as they collect biological data, Jake's avatar is attacked by a thanator and flees into the forest, where he is rescued by Neytiri, a female Na'vi. Witnessing an auspicious sign, she takes him to her clan, whereupon Neytiri's mother Mo'at, the clan's spiritual leader, orders her daughter to initiate Jake into their society.
Colonel Miles Quaritch, head of RDA's private security force, promises Jake that the company will restore his legs if he gathers information about the Na'vi and the clan's gathering place, a giant tree called Hometree,[34] on grounds that it stands above the richest deposit of unobtanium in the area. When Grace learns of this, she transfers herself, Jake, and Norm to an outpost. Over three months, Jake grows to sympathize with the natives. After Jake is initiated into the tribe, he and Neytiri choose each other as mates, and soon afterward, Jake reveals his change of allegiance when he attempts to disable a bulldozer that threatens to destroy a sacred Na'vi site. When Quaritch shows a video recording of Jake's attack on the bulldozer to Administrator Parker Selfridge,[35] and another in which Jake admits that the Na'vi will never abandon Hometree, Selfridge orders Hometree destroyed.
Despite Grace's argument that destroying Hometree could damage the biological neural network native to Pandora, Selfridge gives Jake and Grace one hour to convince the Na'vi to evacuate before commencing the attack. While trying to warn the Na'vi, Jake confesses to being a spy and the Na'vi take him and Grace captive. Seeing this, Quaritch's men destroy Hometree, killing Neytiri's father (the clan chief) and many others. Mo'at frees Jake and Grace, but they are detached from their avatars and imprisoned by Quaritch's forces. Pilot Trudy Chacón, disgusted by Quaritch's brutality, carries them to Grace's outpost, but during the escape, Quaritch fires at them, hitting Grace.
To regain the Na'vi's trust, Jake connects his mind to that of Toruk, a dragon-like predator feared and honored by the Na'vi. Jake finds the refugees at the sacred Tree of Soulsand pleads with Mo'at to heal Grace. The clan attempts to transfer Grace from her human body into her avatar with the aid of the Tree of Souls, but she dies before the process can complete.
Supported by the new chief Tsu'tey, who acts as Jake's translator, Jake speaks to unite the clan and tells them to gather all of the clans to battle against the RDA. Noticing the impending gathering, Quaritch organizes a pre-emptive strike against the Tree of Souls, believing that its destruction will demoralize the natives. On the eve of battle, Jake prays to Eywa, via a neural connection to the Tree of Souls, to intercede on behalf of the Na'vi.
During the subsequent battle, the Na'vi suffer heavy casualties, including Tsu'tey and Trudy; but are rescued when Pandoran wildlife unexpectedly join the attack and overwhelm the humans, which Neytiri interprets as Eywa's answer to Jake's prayer. Then Jake destroys a makeshift bomber before it can reach the Tree of Souls; Quaritch escapes from his own damaged aircraft, wearing an AMP suit and breaks open the avatar link unit containing Jake's human body, exposing it to Pandora's poisonous atmosphere. Quaritch then prepares to slit the throat of Jake's avatar, but Neytiri kills Quaritch and saves Jake from suffocation.
With the exceptions of Jake, Norm, Max (another scientist), and a select few others, all humans are expelled from Pandora and sent back to Earth, after which Jake is transferred permanently into his avatar with the aid of the Tree of Souls.
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. The live action was shot with a modified version of the proprietary digital 3-DFusion Camera System, developed by Cameron and Vince Pace. 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. According to Cameron, the film is composed of 60% computer-generated elements and 40% live action, as well as traditional miniatures.
Motion-capture photography lasted 31 days at the Hughes Aircraft stage in Playa Vista in Los Angeles. Live action photography began in October 2007 at Stone Street Studios in Wellington, New Zealand, and was scheduled to last 31 days. More than a thousand people worked on the production. 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.[89] Before shooting the film, Cameron also sent the cast to the Hawaiian tropical rainforests to get a feel for a rainforest setting before shooting on the soundstage.
During filming, Cameron made use of his virtual camera system, a new way of directing motion-capture filmmaking. The system shows 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." 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. 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".
Cameron gave fellow directors Steven Spielberg and Peter Jackson a chance to test the new technology. 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. Spielberg and George Lucaswere also able to visit the set to watch Cameron direct with the equipment.
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.
Visual effects
A number of innovative visual effects techniques were used during production. According to Cameron, work on the film had been delayed since the 1990s to allow the techniques to reach the necessary degree of advancement to adequately portray his vision of the film.[15][16]The director planned to make use of photorealistic computer-generated characters, created using new motion capture animation technologies he had been developing in the 14 months leading up to December 2006.[91]
Innovations include a new system for lighting massive areas like Pandora's jungle,[96] a motion-capture stage or "volume" six times larger than any previously used, and an improved method of capturing facial expressions, enabling full performance capture. To achieve the face capturing, actors wore individually made skull caps fitted with a tiny camera positioned in front of the actors' faces; the information collected about their facial expressions and eyes is then transmitted to computers.[97] According to Cameron, the method allows the filmmakers to transfer 100% of the actors' physical performances to their digital counterparts.[98] Besides the performance capture data which were transferred directly to the computers, numerous reference cameras gave the digital artists multiple angles of each performance.[99] A technically challenging scene was near the end of the film when the computer-generated Neytiri held the live action Jake in human form, and attention was given to the details of the shadows and reflected light between them