Improving object manipulation skills through hand-object interaction exercises is crucial for rehabilitation. Despite limited healthcare resources, physical therapists propose remote exercise routines followed up by remote monitoring. However, remote motor skills assessment remains challenging due to the lack of effective motion visualizations. Therefore, exploring innovative ways of visualization is crucial, and virtual reality (VR) has shown the potential to address this limitation. However, it is unclear how VR visualization can represent understandable hand-object interactions. To address this gap, in this paper, we present VRMoVi, a VR visualization system that incorporates multiple levels of 3D visualization layers to depict movements. In a 2-stage study, we showed VRMoVi's potential in representing hand-object interactions, with its visualization outperforming traditional representations, and detailed features improved the hand-object interactions understanding. This study takes the initial step in developing VR visualization of hand-object interaction to support remote physical therapy.

翻译：通过手-物交互练习提升物体操控能力对康复治疗至关重要。尽管医疗资源有限，物理治疗师仍提出远程锻炼方案并辅以远程监测。然而，由于缺乏有效的运动可视化手段，远程运动技能评估仍具挑战性。因此，探索创新可视化方法至关重要，而虚拟现实（VR）已展现出应对这一局限的潜力。但VR可视化如何呈现可理解的手-物交互尚不明确。为填补这一空白，本文提出VRMoVi——一种集成多层级三维可视化层来描绘运动的VR可视化系统。通过两阶段研究，我们证明了VRMoVi在呈现手-物交互方面的潜力：其可视化效果优于传统表征方式，且精细特征提升了对手-物交互的理解。本研究迈出了开发手-物交互VR可视化以支持远程物理治疗的第一步。