code: def get_point_along_spline(distance):
      """Return the closest point on the spline given a length along the spline."""
      idx = np.argmin(
          np.abs(spline.point_data["arc_length"] - distance)
      )
      return spline.points[idx]
  
label_desc: Use image node_id 1 for calling a global function with example usage: get_point_along_spline(distance) and returns: spline