code: def start_coordsys(self):
          
          coordsys = copy(self.location)
          coordsys.origin = self.start_point
          return coordsys
docs: Coordinate system at start of effect.
  
          All axes are parallel to the original vector evaluation location, with
          the origin moved to this effect's start point.
  
          :return: coordinate system at start of effect
          :rtype: :class:`CoordSys`