The first feature film to use computer graphics was Westworld in 1973 and then again in the 1976 sequel Futureworld however these were only 2D. It wasn't until 1977 when Star Wars was released that 3d graphics came into play, albeit in the form of a simple wireframe Deathstar model. A slightly more advanced version of this simple wireframe technique was used in Ridley Scott's 1979 film Alien going as far as to show wireframe mountains. Graphics stayed in wireframe mode until the 1981 film Looker however I'm sure we'll all be more familiar with 1982's Tron which used a similar technique.
These effects were created by a number of production facilitates but sadly thanks to a poor reaction to Tron as a film and some difficulties during production made C.G.I in film temporarily unpopular. In 1984 the first photorealistic computer graphic images for a feature film, The Last Starfighter, were used. Graphics were used for all the spaceships, planets and high-tech hardware. For a few more years there were similar efforts in movies and then in 1985 Pixar made (arguably) the first CGI character in a film; a "stained-glass-window-come-to-life effect for Young Sherlock Holmes. It seems that Pixar are (again arguably) the godfathers when it comes to developing C.G.I as finally in 1995 they made the first feature length film rendered entirely from computer graphics, Toy Story.
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