System to film in 3-D. The system would use two high-definition cameras in a single camera body to create depth perception. While these preparations were underway, Fox kept wavering in its commitment to Avatar because of its painful experience with cost overruns and delays on Cameron's previous picture, Titanic. During the production of Titanic, Cameron rewrote the script to streamline the plot by combining several characters' roles and offered to cut his fee if the film were a commercial disappointment. Cameron installed a traffic light with the amber signal lit outside of co-producer Jon Landau's office to represent the film's uncertain future. In mid-2006, Fox told Cameron "in no uncertain terms that they were passing on this film," so he began shopping it around to other studios and approached Walt Disney Studios, showing his proof of concept to then chairman Dick Cook. However, when Disney attempted to take over, Fox exercised its right of first refusal. In , Fox finally agreed to commit to making Avatar after Ingenious Media agreed to back the film, which reduced Fox's financial exposure to less than half of the film's official $237 million budget. After Fox accepted Avatar, one skeptical Fox executive shook his head and told Cameron and Landau, "I don't know if we're crazier for letting you do this, or if you're crazier for thinking you can do this ..." In December 2006, Cameron described Avatar as "a futuristic tale set on a planet 200 years hence ... an old-fashioned jungle adventure with an environmental conscience [that] aspires to a mythic level of storytelling". The press release described the film as "an emotional journey of redemption and revolution" and said the story is of "a wounded former Marine, thrust unwillingly into an effort to settle and exploit an exotic planet rich in biodiversity, who eventually crosses over to lead the indigenous race in a battle for survival". The story would be of an entire world complete with an ecosystem of phantasmagorical plants and creatures, and native people with a rich culture and language. Estimates put the cost of the film at about $280–310 million to produce and an estimated $150 million for marketing, noting that about $30 million in tax credits would lessen the financial impact on the studio and its financiers. A studio spokesperson said that the budget was "$237 million, with $150 million for promotion, end of story." Filming Principal