Room-scale VR is a term that describes the type of VR where the user is free (and oftentimes required) to walk around as part of the experience. The entire room or play area is tracked for VR experiences. Room-scale VR transforms your room into a holodeck similar to that of various science fiction books and films. Currently, the only tracking system that fully supports room-scale VR is the Lighthouse system of SteamVR and HTC Vive.
Room scale systems allow the user to move with six degrees of freedom, tracking both the rotation and position of the user in a large space. Users are free to walk, run and crawl within that space and their actions are accurately reflected within the VR experience.
Unlike seated or standing VR, room scale VR requires space to use. For HTC Vive, play spaces can range from as small as 2 x 1.5 meters to 3.5 x 3.5 meters. Users will generally define this space via the mounting of base stations and then tracing the area using their controllers. For added safety, Vive headsets include a forward facing camera and Chaperone software that can be used to take a peek into real life and warn them if they approach an object such as a piece of furniture or a pet.