Steven Lisberger: Tron (1982)

Tron at the time one probably the most technologically advanced films to have been produced and paved the way for computer animation in film. The film was inspired when Steven Lisberger, saw footage from the video game pong and thought computer generated video could be used for film. Tron was the first film to extensively use computer animated footage within and is regarded as a milestone for that. Most of the animation used was for backgrounds and objects such as the light cycles (image below). The computer used at the time had a max of 2mb of memory so there were serious limitation to what the animators could do. In many circumstances they'd just fade out to black to create a depth to the animation without having to use too much memory.