Changes

{{see also|Markerless inside-out tracking‎|Positional tracking}}

[[File:F2Ak4iE.jpg|thumbnail|Figure 2. Early [[Lighthouse]] prototype, an inside-out tracking system with 2-dimensional barcodes as [[fiducial markers]].]]

[[File:Acer mixed reality headset inside-out.png|thumb|Figure 3. Inside-out tracking HMD (image: www.wareable.com)]]