Trail

/** track options */
      TrackRobot* TrackOpt = new TrackRobot(false,false,false, track_rob);
      TrackOpt->conf.displayTraceDur = 2000;
      TrackOpt->conf.displayTraceThickness = 0.01; // 0.01 or 0.
      agent->setTrackOptions( *TrackOpt );
  
  // track position (plot position in file)
    agent->setTrackOptions(TrackRobot(true, false, false, false, "0"));