I watched Monsters University yesterday, and I really loved the movie. But maybe it’s just me but I haven’t seen many comments for the short film that Pixar features before the actual movie. I am going to be honest, I always thought about it as it was totally computer generated, but still doubted since it looks real, yet gorgeous. There was also the theory that was a combination of real footage with CGI.
Searching for the answer, I came up with this interview by The Verge with Saschka Unseld, Director of the short, and he actually answers it on the first question:
Yeah. The Blue Umbrella was all animated. There is no bit of live action anywhere in the film.
It’s a pretty interesting interview that you should give it a look.