  Teleportation, a widely-used locomotion technique in Virtual Reality (VR),
allows instantaneous movement within VR environments. Enhanced hand tracking in
modern VR headsets has popularized hands-only teleportation methods, which
eliminate the need for physical controllers. However, these techniques have not
fully explored the potential of bi-manual input, where each hand plays a
distinct role in teleportation: one controls the teleportation point and the
other confirms selections. Additionally, the influence of users' posture,
whether sitting or standing, on these techniques remains unexplored.
Furthermore, previous teleportation evaluations lacked assessments based on
established human motor models such as Fitts' Law. To address these gaps, we
conducted a user study (N=20) to evaluate bi-manual pointing performance in VR
teleportation tasks, considering both sitting and standing postures. We
proposed a variation of the Fitts' Law model to accurately assess users'
teleportation performance. We designed and evaluated various bi-manual
teleportation techniques, comparing them to uni-manual and dwell-based
techniques. Results showed that bi-manual techniques, particularly when the
dominant hand is used for pointing and the non-dominant hand for selection,
enable faster teleportation compared to other methods. Furthermore, bi-manual
and dwell techniques proved significantly more accurate than uni-manual
teleportation. Moreover, our proposed Fitts' Law variation more accurately
predicted users' teleportation performance compared to existing models.
Finally, we developed a set of guidelines for designers to enhance VR
teleportation experiences and optimize user interactions.
