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2017 IEEE Virtual Reality (VR) (2017)
Los Angeles, CA, USA
March 18, 2017 to March 22, 2017
ISSN: 2375-5334
ISBN: 978-1-5090-6648-3
pp: 91-98
Mahdi Azmandian , USC Institute for Creative Technologies, Los Angeles CA, USA
Timofey Grechkin , USC Institute for Creative Technologies, Los Angeles CA, USA
Evan Suma Rosenberg , USC Institute for Creative Technologies, Los Angeles CA, USA
As the focus of virtual reality technology is shifting from singleperson experiences to multi-user interactions, it becomes increasingly important to accommodate multiple co-located users within a shared real-world space. For locomotion and navigation, the introduction of multiple users moving both virtually and physically creates additional challenges related to potential user-on-user collisions. In this work, we focus on defining the extent of these challenges, in order to apply redirected walking to two users immersed in virtual reality experiences within a shared physical tracked space. Using a computer simulation framework, we explore the costs and benefits of splitting available physical space between users versus attempting to algorithmically prevent user-to-user collisions. We also explore fundamental components of collision prevention such as steering the users away from each other, forced stopping, and user re-orientation. Each component was analyzed for the number of potential disruptions to the flow of the virtual experience. We also develop a novel collision prevention algorithm that reduces overall interruptions by 17.6% and collision prevention events by 58.3%. Our results show that sharing space using our collision prevention method is superior to subdividing the tracked space.
Legged locomotion, Tracking, Collision avoidance, Virtual environments, Trajectory, Navigation

M. Azmandian, T. Grechkin and E. S. Rosenberg, "An evaluation of strategies for two-user redirected walking in shared physical spaces," 2017 IEEE Virtual Reality (VR), Los Angeles, CA, USA, 2017, pp. 91-98.
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