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What are the differences between the functions contactStarted(), contactPersisted() and contactEnded() and when should one be used?
In class FContactResult, when getNormalImpulse() and getTangentImpulse() are used, what is exactly the unit of the returned float values (or any metric/scale relationship to anything, say, the setScale method)? For instance, if a collision returns a float value of 40.0, how do we make sense of that scale of magnitude?