def get_world_inverse(self):
        matrix = self.get_local_inverse()

        p = self.parent
        while p is not None:
            matrix = matrix * p.get_local_inverse()
            p = p.parent

        return matrix
returns an :class:`.euclid.Matrix3` with the world inverse 
dataset/ETHPy150Open los-cocos/cocos/cocos/cocosnode.py/CocosNode.get_world_inverse