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Comment on Animating with physics instead of a timing functionparent

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Do you mean Verlet.js?[1]

Note that box2djs is also very capable[2], and has been around for years (it is port of Erin Catto's great work on Box2D[3]).

[1] http://subprotocol.com/2013/04/18/introducing-verlet-js.html

[2] http://www.jeremyhubble.com/box2d.html

[3] http://box2d.org/

I think parent was referring to more on the role of a physics engine in UI, not on physics engines in general. There are plenty of those, but how many UI toolkits are provide real physical animation? As in....the infamous TAT Foldout UI Demo:

https://www.youtube.com/watch?v=FtR_zA9elrM

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