Magnets play an ongoing role in virtual reality through electromagnetic tracking (EMT), a technology that uses magnetic fields to pinpoint a sensor's position in 3D space without a direct line of sight. While most consumer VR headsets today (like Meta Quest and Apple Vision Pro) rely on camera-based hand tracking, electromagnetic tracking remains the go-to solution for professional motion capture, surgical navigation, and situations where cameras alone can't keep up.

Where It Started: The Finexus Project

Back in 2015, Keyu Chen, a graduate student at the University of Washington, developed a system called Finexus while interning at Oculus Research. Finexus used small electromagnets mounted on the fingertips paired with four magnetometers to track finger movement in real time without needing a camera to "see" the fingers at all. Because magnetic fields pass through obstructions that would blind a camera, Finexus could, in theory, track finger position more reliably in exactly those moments. Finexus never shipped, but the concept it explored is still alive today, just in different corners of the VR and motion-capture world.

Where Electromagnetic Tracking Is Used Today

Consumer VR Headsets Went a Different Direction

Modern consumer headsets like Meta Quest 3 and Apple Vision Pro use inside-out camera tracking for hands and fingers. These small cameras are built into the headset to watch your hands and use machine learning to interpret finger position. It works well for pinching, pointing, and grabbing in well-lit environments, but it still struggles when hands overlap, move behind the body, or fall outside the camera's field of view.

Professional Motion Capture Still Relies On Magnetic Sensing

In film production, robotics, and high-end VR development, professional-grade tracking gloves combine inertial sensors with electromagnetic field (EMF) tracking to capture finger movement with a precision cameras can't match. Because these systems don't depend on line of sight, they hold up in situations that would trip up a camera-based system, like tight grips, overlapping fingers, and props in hand.

The Future Of VR

Camera-based tracking will likely keep improving, but it has a hard physical limit: it can't see what it can't see. Electromagnetic tracking fills that gap. As VR and mixed reality push into more demanding applications like remote surgery training, industrial simulation, and precision skills training, expect magnetic sensing to keep playing a supporting role alongside cameras.

Magnets Power More Than You'd Think

From industrial applications to emerging technology like virtual reality, magnets continue to show up in surprising places. If you have questions about magnet applications for your industry or project, contact us — we're happy to help.

 

Safety Warning: Children should not be allowed to play with magnets. Small magnets present a choking hazard and can cause serious injury if swallowed. Neodymium magnets should always be handled with care to avoid pinching injuries and damage to the magnets. Visit our Magnet Safety page to learn more.

Magnets can be dangerous. Neodymium magnets, especially, must be handled with care to avoid personal injury and damage to the magnets. Fingers and other body parts can get severely pinched between two attracting magnets. Bones can be broken by larger magnets. Visit our Magnet Safety page to learn more.