anyone know how angry bird simulate collision and casting?

I am rea开发者_如何学运维lly interesting at how "Angry Bird" simulate the collision and casting.

If I want to implement the similar affect, what knowledge should I acquire ? Any references for that ?

Thanks very much !

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It's probably using Box2D, like most 2D physics-based games these days. There are literally hundreds of ('twas rather shocking how popular this particular one became).

Here's an example Birds-alike, with source (Lua).