There is a project at
to make a DIY 3D controller with capacitors to infer the 3D position of the object being tracked (hand) without using any wiring to hand. My question is it possible to build a 3D sensor that uses changes in magnetic files and inductors (instead of the capacitors) to also build a hands free 3D tracker?-probably the hand would need a metal object possibly a finger ring to create a change in the three or more magnetic fields. So, if possible, whats the circuit for the 3D sensor using changes in magnetic fields instead? Also is there a simple circuit to do it like known capacitor circuit mentioned above? As a guess it could probably be done with two magnetic fields if it works something like 2d vision tracking where two 2d pictures (in suitable planes and orientations) can be used to determine the 3d position of the object.