Collision resolution data.
groupMath
   The first game object in the collision.
    The second game object in the collision.
    The contact normal.
    The length of the displacement.
    The displacement source game object have to make to avoid the collision.
    If the collision is resolved.
    Prevent collision resolution if not yet resolved.
sincev3000.0
    If the 2 objects have any overlap, or they're just touching edges.
sincev3000.0
    Get a new collision with reversed source and target relationship.
   isTop(): boolean
 If the collision happened (roughly) on the top side.
    If the collision happened (roughly) on the bottom side.
    If the collision happened (roughly) on the left side.
    If the collision happened (roughly) on the right side.