The article contains a comparative analysis of two methods of calculating angles in the shoulder joint of the right upper limb. For the purposes of this study, a marker-vector method was developed that calculates angles based on retroreflective 3D marker’s positions and vectors created on the basis of their positions. Movements from two types of sports (sword fighting and tennis forehand) were analysed. These movements were recorded using an optical motion capture system. The obtained results were compared with the values read from the Plug-in Gait biomechanical model from C3D files. The results show that the proposed method is more universal and can be used independently. In addition, the Plug-in Gait model is not adequate for the analysis of the acquired shoulder angles of tennis players.

中文翻译：

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使用三维数据分析两种指示肩关节角度的方法

该文章包含对两种计算右上肢肩关节角度的方法的比较分析。为了本研究的目的，开发了一种标记矢量方法，该方法可根据逆反射3D标记的位置以及基于其位置创建的矢量来计算角度。分析了两种运动的动作（剑术和网球正手）。使用光学运动捕获系统记录了这些运动。将获得的结果与从C3D文件中的“插入式步态”生物力学模型读取的值进行比较。结果表明，该方法具有通用性，可以独立使用。另外，插入式步态模型不足以分析网球运动员获得的肩角。