sets camera position to a point

def set_position(self, point, reset=False):
        """ sets camera position to a point """
        if isinstance(point, np.ndarray):
            if point.ndim != 1:
                point = point.ravel()
        self.camera.SetPosition(point)
        if reset:
            self.reset_camera()
        self.camera_set = True
        self._render()