I was wonder what the difference was between SetActive and SetAwake. This is kind of obvious once you look in the Box2d Manual and read it yourself.
SetAwake - Sets the b2Body to awaken from sleep or sets it to sleep. If any other body comes into contact with this body it will awaken by itself.
SetActive - Sets the b2Body to active or inactive. If any other body comes into contact with this body it will NOT awake and not be simulated.
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thx,it's helpful
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