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	Class	Description
	b2Body	A rigid body.
	b2BodyDef	A body definition holds all the data needed to construct a rigid body.
	b2ContactFilter	Implement this class to provide collision filtering.
	b2ContactImpulse	Contact impulses for reporting.
	b2ContactListener	Implement this class to get contact information.
	b2DebugDraw	Implement and register this class with a b2World to provide debug drawing of physics entities in your game.
	b2DestructionListener	Joints and shapes are destroyed when their associated body is destroyed.
	b2FilterData	This holds contact filtering data.
	b2Fixture	A fixture is used to attach a shape to a body for collision detection.
	b2FixtureDef	A fixture definition is used to create a fixture.
	b2World	The world class manages all physics entities, dynamic simulation, and asynchronous queries.