When one of the drones is displaced a bit, it comes back to its original position in the formation while avoiding other drones that come along its way
The drones in formation rise up when another fast moving drone approaches them, to avoid a collision, and finally come back to their proper positions
Setting up rotors_simulator and mav_control_rw in your system
Comment out the lines for PX-4 Autopilot from the .bashrc file if you have it installed already