Development on Avatar began in 1994, when Cameron wrote an 80-page scriptment for the film. Filming was supposed to take place after the completion of Cameron's 1997 film Titanic, for a planned release in 1999, but according to Cameron, the necessary technology was not yet available to achieve his vision of the film. Work on the language for the film's extraterrestrial beings began in summer 2005, and Cameron began developing the screenplay and fictional universe in early 2006.
Avatar was officially budgeted at US$237 million. Other estimates put the cost between $280 million and $310 million for production, and at $150 million for promotion. The film was released for traditional two-dimensional projectors, as well as in 3-D, using the RealD 3D, Dolby 3D, XpanD 3D and IMAX 3D formats, and also in 4-D. The stereoscopic filmmaking was touted as a likely breakthrough in cinematic technology.