def update(self,dt):
        """
        Should be called regularly to move the actor.
        
        This method does nothing if the :py:attr:`enabled` property is set to False.
        
        This method is called automatically and should not be called manually.
        """
        if not self.enabled:
            return
        dy = self.speed * dt * self.move
        x,y,z = self.actor._pos
        newpos = x,dy+y,z
        self.actor.pos = newpos
Should be called regularly to move the actor.
        
        This method does nothing if the :py:attr:`enabled` property is set to False.
        
        This method is called automatically and should not be called manually.