Motion Capture Sensors

Motion capture, motion tracking, or mocap is a technique of digitally recording movements.

http://www.youtube.com/watch?v=oXG6PI_yXZY
Publish Post

Magnetic Motion Capture Systems:

Magnetic motion capture systems utilize sensors placed on the body to measure the low-frequency magnetic field generated by a transmitter source. The sensors and source are cabled to an electronic control unit that correlates their reported locations within the field. The electronic control units are networked with a host computer that uses a software driver to represent these positions and rotations in 3D space.

Magnetic systems use 6 to 11 or more sensors per person to record body joint motion. The sensors report position and rotational information. Inverse kinematics (IK) is used to solve the angles for the various body joints, and compensate for the fact that the sensors are offset from the actual joint's center of rotation.

I think that we wont be using this kind of sensor.