Whole-body movements enhance the presence and enjoyment of Virtual Reality (VR) experiences. However, using large gestures is often uncomfortable and impossible in confined spaces (e.g., public transport). We introduce FingerMapper, mapping small-scale finger motions onto virtual arms and hands to enable whole-body virtual movements in VR. In a first target selection study (n=13) comparing FingerMapper to hand tracking and ray-casting, we found that FingerMapper can significantly reduce physical motions and fatigue while having a similar degree of precision. In a consecutive study (n=13), we compared FingerMapper to hand tracking inside a confined space (the front passenger seat of a car). The results showed participants had significantly higher perceived safety and fewer collisions with FingerMapper while preserving a similar degree of presence and enjoyment as hand tracking. Finally, we present three example applications demonstrating how FingerMapper could be applied for locomotion and interaction for VR in confined spaces.

翻译：全身运动能够增强虚拟现实（VR）体验的沉浸感与趣味性。然而，在受限空间（如公共交通工具）中，大幅度的身体动作往往令人不适且难以实现。我们提出FingerMapper技术，通过将小幅手指运动映射到虚拟手臂和双手上，从而在VR中实现全身虚拟运动。在一项首次目标选择研究（n=13）中，对比FingerMapper与手部追踪及射线投射技术，我们发现FingerMapper能够显著减少物理运动强度和疲劳感，同时保持相似的精确度。在后续研究（n=13）中，我们在受限空间（汽车副驾驶座位）内对比了FingerMapper与手部追踪技术。结果显示，使用FingerMapper时，参与者感知到的安全性显著提升，碰撞次数显著减少，同时保持了与手部追踪相似的沉浸感和趣味性。最后，我们展示了三个示例应用，说明FingerMapper如何用于受限空间中的VR移动和交互。