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我最近在使用reactingParcelFilmFoam计算水滴与结构表面撞击并形成水膜的过程中，我想往模型中添加一个水滴的收集系数，这个系数需要知道水滴在撞击到结构时的位置坐标和初始的位置坐标，请问有人知道该怎么确定这两个坐标吗？
