![log of direction change [x, y, z]](https://i1.wp.com/interaction.jonasscheiwiller.ch/wp-content/uploads/2016/04/direction_change_log.jpg?resize=720%2C300)
The Leap Motion SDK offers a method called hand.palmVelocity. Unfortunately this does not seem to behave like I would expect it to, if measured during fast movements. For a quick hand shake (indicating a cancelling gesture) I may use the hands palm position to get a more reliable tracking. The picture above shows a log and logs direction changes depending on the x-coordinates ([x, y, z]). Again a good understanding of how the leap is registering hand movements is crucial for a successful gesture implementation.