Smaller version of motion tracking hardware, similar to the equipment used to animate movies. Something similar to its cheap version was 3D glove on kickstarter, with much cheaper version it failed to get the amount of money to get it produced, so as a commercial project it is not useful, but making a prototype for personal use with higher precision makes sense, except the price for the parts, labor and time - and it is cumbersome, requires a separate computer and professional calibration.
