CGI allows the people working in film to control what is happening a lot easier than using loads and loads of extras in a crowd scene, or constructing miniatures for effects. Almost every film made today will have some aspect of CGI to give their film better effects.
CGI was first seen in movies in the 1973 film Westworld.
The film was based around robots living around humans. A bit like 'I Robot' starring Will Smith. Another example is Jurassic park; action scenes with real life actors amongst dinosaurs. This gives a really good effect and makes the movie come alive and allot more exciting for an audience as they were realistic images.
Over 30 years since CGI was first introduced, most films will use this type of computer based technology, even for the smallest things.
Avatar is a great recent example, without CGI this film could not have been made so successfully, or even at all.
With these amazing effects, avatar was made to be exciting, thrilling and the lovely shots and scenes you see on your screen make it so successful.
CGI allows more freedom in ideas for films, as the effects can make them happen allot easier, allot quicker and with the most amazing effects.
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