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这个问题主要是找到边界面正对的面,然后通过neighbor-owner找到单元。可以通过边界面的点找到共点的edge,然后找到另一顶点,再来查找面。呃,好像有点繁琐。第二个可以通过particle类,将边界面法相取反作为位移方向,edge长度作为位移,trackToFace找到面。记得用labelPair保存相邻单元。