How to use the dataclasses.I3Position function in dataclasses

# now apply the DOM orientation (this will flip over the DOM)
                    flasherDir = omGeo.orientation.rotate_out(flasherDir)
                    #flasherDir = omGeo.orientation.rotate(flasherDir)
                    # for standard DOMs (i.e. pointing down), flashers are now 
                    # ordered clockwise when viewed from above
                    
                    flasherPos = dataclasses.I3Direction()
                    # flasher position on flasher board
                    flasherPos.set_theta_phi(90.*I3Units.deg, flasherAziRotation) # no upwards tilt for position
                    # flasher position in DOM coordinates
                    flasherPos = dataclasses.I3Position(flasherPos.x*flasherRadiusInDOM, flasherPos.y*flasherRadiusInDOM, flasherZPosInDOM)
                    # apply the DOM orientation (this will flip over the DOM)
                    #flasherPos = omGeo.orientation.rotate(flasherPos)
                    flasherPos = omGeo.orientation.rotate_out(flasherPos)
                    # shift to the actual position in global coordinates
                    flasherPos = dataclasses.I3Position(domPos.x + flasherPos.x, domPos.y + flasherPos.y, domPos.z - flasherPos.z)
                else:
                    # old-style I3OMGeo (only up/down enum and aziangle for DOM orientation):
                    # do calculations in global coordinate system (DOM axis towards -z)

                    # the rotation of flashers is clockwise when viewed from above
                    # flasher LED1 and LED7 (both flasherPosIndex==0) are assumed 
                    # to point towards the DOM's x-axis.
                    flasherAziRotation = -60.*I3Units.deg * float(flasherPosIndex)
                    flasherUpwardsTiltAngle = 0.
                    if tiltedFlasher: flasherUpwardsTiltAngle=48.*I3Units.deg # (or 42deg down from the vertical)

                    flasherDir = dataclasses.I3Direction()
                    flasherDir.set_theta_phi(90.*I3Units.deg - flasherUpwardsTiltAngle, flasherAziRotation - omGeo.aziangle)

                    flasherPos = dataclasses.I3Direction()
                    # flasher position on flasher board

flasherUpwardsTiltAngle = 0.
                    if tiltedFlasher: flasherUpwardsTiltAngle=48.*I3Units.deg # (or 42deg down from the vertical)

                    flasherDir = dataclasses.I3Direction()
                    flasherDir.set_theta_phi(90.*I3Units.deg + flasherUpwardsTiltAngle, flasherAziRotation)
                    # now apply the DOM orientation (this will flip over the DOM)
                    flasherDir = omGeo.orientation.rotate_out(flasherDir)
                    #flasherDir = omGeo.orientation.rotate(flasherDir)
                    # for standard DOMs (i.e. pointing down), flashers are now 
                    # ordered clockwise when viewed from above
                    
                    flasherPos = dataclasses.I3Direction()
                    # flasher position on flasher board
                    flasherPos.set_theta_phi(90.*I3Units.deg, flasherAziRotation) # no upwards tilt for position
                    # flasher position in DOM coordinates
                    flasherPos = dataclasses.I3Position(flasherPos.x*flasherRadiusInDOM, flasherPos.y*flasherRadiusInDOM, flasherZPosInDOM)
                    # apply the DOM orientation (this will flip over the DOM)
                    #flasherPos = omGeo.orientation.rotate(flasherPos)
                    flasherPos = omGeo.orientation.rotate_out(flasherPos)
                    # shift to the actual position in global coordinates
                    flasherPos = dataclasses.I3Position(domPos.x + flasherPos.x, domPos.y + flasherPos.y, domPos.z - flasherPos.z)
                else:
                    # old-style I3OMGeo (only up/down enum and aziangle for DOM orientation):
                    # do calculations in global coordinate system (DOM axis towards -z)

                    # the rotation of flashers is clockwise when viewed from above
                    # flasher LED1 and LED7 (both flasherPosIndex==0) are assumed 
                    # to point towards the DOM's x-axis.
                    flasherAziRotation = -60.*I3Units.deg * float(flasherPosIndex)
                    flasherUpwardsTiltAngle = 0.
                    if tiltedFlasher: flasherUpwardsTiltAngle=48.*I3Units.deg # (or 42deg down from the vertical)