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[[File:Acer mixed reality headset inside-out.png|thumb|Figure 3. Inside-out tracking HMD (image: www.wareable.com)]]
'''Inside-out tracking''' is a method of [[positional tracking]] commonly used in [[virtual reality]] (VR) technologies, specifically for tracking the position of [[head-mounted display|head-mounted displays]] (HMDs) and motion controller accessories.
It is egocentric. It usually involves [[SLAM]] or [[VIO]] for markerless tracking.<ref name="m249">{{cite web | title=Inside-out tracking | website=XVRWiki | date=2024-09-30 | url=https://www.xvrwiki.org/wiki/Inside-out_tracking | access-date=2024-10-05}}</ref>
It differentiates itself from [[outside-in tracking]] by the location of the cameras or other sensors that are used to determine the object’s position in space (Figure 1). In inside-out positional tracking, the camera or sensors are located on the device being tracked (e.g. HMD) while in outside-in the sensors are placed in a stationary location. <ref name=”1”> Ribo, M., Pinz, A. and Fuhrmann, A.L. (2001). A new optical tracking system for virtual and augmented reality applications. Instrumentation and Measurement Technology Conference Proceedings</ref> <ref name=”2”> Boger, Y. (2014). Positional tracking: "Outside-in" vs. "Inside-out.” Retrieved from http://vrguy.blogspot.pt/2014/08/positional-tracking-outside-in-vs.html</ref> <ref name=”3”> Ishii, K. (2010). Augmented Reality: Fundamentals and nuclear related applications. Nuclear Safety and Simulation, 1(1)</ref>
