@thomasfuchs the first computer generated movie I saw was in an IMAX theatre in the Netherlands as part of a treat for contestants of a computer programming contest.

It was called "The Magic Egg", released as part of SIGRAPH in 1984. It blew my teenage brain.

m.imdb.com/title/tt0087662/

Edit: The movie itself: youtu.be/nf7jpGMkOnI