” Ball juggling experiments with quadrotors in the ETH Flying Machine Arena By Mark Müller, Sergei Lupashin and Raffaello D’Andrea. They are not human-piloted The vehicles/ball are tracked by an overhead motion capture system and controlled by a pair of computers.”
Behind the scenes: Their Flying Machine Arena an overview of the ETH Flying Machine Arena (FMA) as of 2010. The FMA is an indoor 1000-cubic meter volume dedicated for research in autonomous systems and aerial robotics. It’s located in Zurich, Switzerland.
More info @ FlyingMachineArena.org