A virtual reality player often views a virtual reality scene of a virtual world while the player is located in a physical world via a head-mounted display. If the physical world is a virtual reality room, the scene can be re-centered within a known region, where stationary objects in the physical world (furniture, walls, etc.) may be accounted for via data such as maps or dimensions of the virtual reality room. However, in instances where the physical world is not a virtual reality room, such as a random standing space or a couch of a player’s house, a virtual reality content system cannot rely on such data, leaving the player’s proximity to objects in the room unknown. Apparatuses and methods are described that, for such instances, establish a reference location in the physical world as a head-mounted display is donned (e.g., don origin) and subsequently monitor location of the head-mounted display as the player changes location in the physical world. Such apparatus and methods may indicate to a player if thresholds of a clearance zone have been violated, allowing the player to assess his surroundings prior to continuing play.
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McKenzie, Chris, "Virtual Reality Re-Centering", Technical Disclosure Commons, (December 08, 2017)