1. A method of coordinating motion-capture of at least one hand by a network of motion-capture sensors having overlapping fields of view, the method comprising: designating a first sensor among three or more motion-capture sensors as having a master frame of reference; observing motion of a hand as it passes through overlapping fields of view of the respective motion-capture sensors; synchronizing capture of images of the hand within the overlapping fields of view by at least pairs of the motion-capture devices; and using the pairs of the hand images captured by the synchronized motion-capture devices to automatically calibrate the motion-capture sensors to the master frame of reference frame.