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 下面自己总结的 计算点与TopoDS_Shape中各个点的距离的代码，输入为gn_Pnt类型的点

//DesPnt 为输入

TopExp_Explorer Ex; 	Standard_Real MinDisance = 1e+10;	Standard_Real CurDisance = 0.0;	gp_Pnt current,ResPnt;	for (Ex.Init(S,TopAbs_VERTEX); Ex.More(); Ex.Next()) { 		TopoDS_Vertex currentVt = TopoDS::Vertex(Ex.Current());	current = BRep_Tool::Pnt(currentVt);	CurDisance = current.Distance(DesPnt);	if(CurDistance

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