When we get lost in Virtual Reality (VR) or want to return to a previous location, we use the same methods of locomotion for the way back as for the way forward. This is time-consuming and requires additional physical orientation changes, increasing the risk of getting tangled in the headsets' cables. In this paper, we propose the use of undo actions to revert locomotion steps in VR. We explore eight different variations of undo actions as extensions of point\&teleport, based on the possibility to undo position and orientation changes together with two different visualizations of the undo step (discrete and continuous). We contribute the results of a controlled experiment with 24 participants investigating the efficiency and orientation of the undo techniques in a radial maze task. We found that the combination of position and orientation undo together with a discrete visualization resulted in the highest efficiency without increasing orientation errors.

翻译：当我们在虚拟现实中迷失方向或希望返回先前位置时，通常采用与前进相同的移动方式原路返回。这种方式耗时且需要额外的身体定向调整，增加了被头显线缆缠绕的风险。本文提出在虚拟现实中使用撤销动作来回溯移动步骤。我们基于是否可撤销位置与方向变化、结合离散与连续两种撤销步骤可视化方式，探索了八种作为点传送延伸的撤销动作变体。通过一项包含24名参与者的控制实验，我们研究了径向迷宫任务中撤销技术的效率与定向能力。研究发现，位置与方向联合撤销配合离散可视化方案能在不增加定向错误的情况下实现最高效率。