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A somewhat awkward moment came during the presentation’s Q&A portion, when a questioner asked about the physics engine used in [Angry Birds], and why it wasn’t credited in the game itself. Only after Vesterbacka agreed that it should be credited did the questioner reveal himself as Erin Catto, creator of the open source Box2D physics engine used in the game.
“I have to talk to you after this,” Vesterbacka called out above audience applause, after the revelation.
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