Got the cardboard demo app to fire up on my Nexus 4 using a magnet. Waving it around the headphone port seems to trigger the 'switch'. Was curious about how it

Got the cardboard demo app to fire up on my Nexus 4 using a magnet. Waving it around the headphone port seems to trigger the 'switch'. Was curious about how it did motion tracking. Seems all the demos use the accelerometer for tracking. Was sort of hoping they worked out how to use the camera for motion tracking. Now all I need is lenses, an nfc chip, laser cutter, and proper weight to strength ratio cardboard!