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these aren't QR codes
{{see also|Markerless inside-out tracking|Positional tracking}}
[[File:Inside out vs. outside in tracking.png|thumb|Figure 1. Inside-out vs. outside-in tracking (Image: Ishii, 2010)]]
[[File:F2Ak4iE.jpg|thumbnail|Figure 2. Early [[Lighthouse]] prototype, an inside-out tracking system with QR codes 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)]]
