Which VR headset was the first to successfully implement inside-out tracking, eliminating the need for external sensors or base stations?

The evolution of Virtual Reality in gaming has transformed how players interact with digital worlds. From bulky headsets to sophisticated systems tracking precise movements, VR technology has made remarkable advancements in creating immersive gaming experiences. This trivia question explores a pivotal moment in VR gaming history that changed the industry's trajectory and consumer expectations about virtual reality experiences.

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Oculus Quest
HTC Vive Pro
PlayStation VR
Valve Index