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First we pre-visualized it [the flying fish scene in 'Life of Pi'] so the actors could act. It took a long time to get that to come to life and to design those coming out of the screen. We had great fun with that. It takes a long time, a year maybe.

"Ang Lee Talks LIFE OF PI, the Difficulty of Getting the Project Off the Ground, 3D as a New Artistic Form, Deleted Scenes and More". Interview with Steve 'Frosty' Weintraub, collider.com. October 3, 2012.
First we pre-visualized it [the flying fish scene in 'Life of Pi'] so the actors could act. It took a long time to get that to come to life and to design those coming out of the screen. We had great fun with that. It