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，通常使用与前进相同的移动方法返回。这既耗时又需要额外的身体方位调整，增加了被头戴式设备线缆缠住的风险。本文提出在虚拟现实中利用后退动作撤销移动步骤。我们基于撤销位置和方向变化的可能性，结合两种后退步骤可视化方式（离散与连续），探索了作为点触传送扩展的八种不同后退动作变体。我们通过一项涉及24名参与者的受控实验，在径向迷宫任务中研究了后退技术的效率与方向感知，并得出结果：位置与方向联合撤销配合离散可视化方案，可在不增加方向错误的情况下实现最高效率。