Editing Motion capture (section)

===Magnetic systems===
{{Main|Positional tracking#Magnetic tracking}}
Magnetic systems calculate position and orientation by the relative magnetic flux of three orthogonal coils on both the transmitter and each receiver.<ref name="NGen10Mag">{{cite journal|title=Motion Capture: Magnetic Systems|journal=[[Next Generation (magazine)|Next Generation]]|issue=10|publisher=[[Imagine Media]]|date=October 1995|page=51}}</ref> The relative intensity of the voltage or current of the three coils allows these systems to calculate both range and orientation by meticulously mapping the tracking volume. The sensor output is [[six degrees of freedom]] (6DOF), which provides useful results obtained with two-thirds the number of markers required in optical systems; one on upper arm and one on lower arm for elbow position and angle.{{citation needed|date=August 2016}} The markers are vulnerable to magnetic and electrical interference from metal objects in the environment, like rebar (steel reinforcing bars in concrete) or wiring, which affect the magnetic field, and electrical sources such as monitors, lights, cables and computers.

The sensor response is nonlinear, especially toward edges of the capture area. The wiring from the sensors tends to preclude extreme performance movements.<ref name="NGen10Mag"/> With magnetic systems, it is possible to monitor the results of a motion capture session in real time.<ref name="NGen10Mag"/> The capture volumes for magnetic systems are dramatically smaller than they are for optical systems. With the magnetic systems, there is a distinction between [[Alternating current|alternating-current]] (AC) and [[Direct current|direct-current]] (DC) systems: DC system uses square pulses, AC systems use sine waves.