In 1970 even the simplest computer animation was so expensive and time consuming to do that it was far cheaper to do cell animation, where each image was drawn on a clear acetate just like Mickey Mouse cartoons.
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He himself was in Launch Control with a NASA cameraman and was the only civilian ever issued a pass to the Firing Room.
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It was during this scouting trip to Cape Canaveral that the idea came to him to begin the film with Stonehenge, which he had seen on a sunless dawn the year before while in England shooting another film.