drg = []
drg.append(trick.DRAscii("cannon_aero"))
#drg[0] = trick.DRAscii("cannon_aero")
drg[0].set_freq(trick.DR_Always)
drg[0].set_cycle(0.01)

drg[0].add_variable("dyn.baseball.pos[0]")
drg[0].add_variable("dyn.baseball.pos[1]")
#drg[0].add_variable("dyn.baseball.pos[2]")

trick.add_data_record_group( drg[0], trick.DR_Buffer )
drg[0].enable()