anchor.diff:    /// changes that affects the matrix.
     void invalidateTransformMatrix() {
       _transformMatrix = null;
  +    _transformMatrixInverse = null;
       _invalidateToBoxTransformMatrix();
     }
   
  
positive.code:       return position;
      } else if (physicsParent is PhysicsGroup) {
        // Transform the position
        Matrix4 inverseTransform = new Matrix4.copy(physicsParent.transformMatrix);
        inverseTransform.invert();
        Vector4 parentPos = inverseTransform.transform(new Vector4(position.x, position.y, 0.0, 1.0));
        Point newPos = new Point(parentPos.x, parentPos.y);
        return _positionToPhysics(newPos, physicsParent.parent);
      } else {
  
negative.code:     _transformMatrixBoxToNode.invert();
  
      return _transformMatrixBoxToNode;
    }
  
    Matrix4 _inverseMatrix() {
      if (_transformMatrixInverse == null) {
        _transformMatrixInverse = new Matrix4.copy(transformMatrix);
        _transformMatrixInverse.invert();
      }
      return _transformMatrixInverse;
    }
  
    /// Converts a point from the coordinate system of the [SpriteBox] to the local coordinate system of the node.
  