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FB
Facebook today open sourced Pop, the engine behind Paper’s smooth animations and transitions, over on GitHub. Pop uses dynamic instead of traditional static animations to control the scrolling, bouncing, and unfolding effects in the social news app. Facebook software engineer Kimon Tsinteris, who co-founded Push Pop Press before joining the social networking company in August 2011, notes that iOS has always excelled at supporting static animations. “The Apple-provided Core Animation framework makes linear, ease-in, ease-out, and ease-in-ease-out animations simple to leverage,” he explains. Tsinteris adds, however, that his animation engine goes a level higher: “With Pop, we are able to…

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