A manifold point is a contact point belonging to a contact
manifold. It holds details related to the geometry and dynamics
of the contact points.
The local point usage depends on the manifold type:
-e_circles: the local center of circleB
-e_faceA: the local center of cirlceB or the clip point of polygonB
-e_faceB: the clip point of polygonA
This structure is stored across time steps, so we keep it small.
Note: the impulses are used for internal caching and may not
provide reliable contact forces, especially for high speed collisions.
public var m_id:b2ContactID
public var m_localPoint:b2Vec2
public var m_normalImpulse:Number
public var m_tangentImpulse:Number
public function b2ManifoldPoint()
public function Reset():void
public function Set(m:b2ManifoldPoint):voidParameters
Box2DFlash 2.1a
