AR / VR / XR & Spatial Computing

XR spectrum · 6-DoF tracking · presence · motion-to-photon

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How augmented, mixed, and virtual reality work — from the reality-virtuality continuum through stereoscopy, head tracking, SLAM, latency budgets, and the techniques that make it all feel real.

By the end, you can

Place AR, MR, and VR on the reality-virtuality continuum and explain what XR encompasses.
Describe how stereoscopy and head tracking together produce the feeling of presence.
Distinguish 3-DoF from 6-DoF tracking and explain why 6-DoF is needed for spatial computing.
Explain how inside-out visual-inertial SLAM works and why it needs no external base stations.
Describe what a Kalman filter does when fusing IMU and camera data.
List every stage of the motion-to-photon pipeline and state the ~20 ms comfort target.
Explain the vestibular-mismatch mechanism that causes cybersickness.
Describe three techniques — high refresh rate with low-persistence displays, foveated rendering, and accurate low-latency motion tracking — and explain how each reduces motion-to-photon latency and the motion sickness it causes.
Explain AR registration, world anchors, occlusion, and lighting estimation.
State what problem OpenXR solves and name its core API concepts.

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