private void SendCollisionMessage(Vector3 normal, PhysicsEntity obj, PhysicsEntity other)
{
var collisionInfo = new CollisionInfo(obj, other, normal);
obj.SendMessage("OnCollide", collisionInfo, SendMessageOptions.DontRequireReceiver);
other.SendMessage("OnCollide", collisionInfo.GetOtherInfo(), SendMessageOptions.DontRequireReceiver);
}