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beam.Get3dPhysicalArc(out Ccir3d);//由曲梁生成弧线arc
beam.GetSystemlineCurve(out curve_p);//由曲梁生成曲线curve3d
MessageBox.Show(“点到线的距离 :” + Ccir3d.DistanceTo(ppt));
MessageBox.Show(“线的长度 :” + Ccir3d.GetLength());
ppt = Ccir3d.GetClosestPointTo(ppt);
MessageBox.Show(“点到线的最近点:” + ppt.x + " " + ppt.y + " " + ppt.z);
Ccir3d.GetPerpIntersections(ppt, out ppt1, 0, tol);
MessageBox.Show("点和线的交点: " + ppt1.Max().x + " " + ppt1.Max().y + " " + ppt1.Max().z + " " + ppt1.Count());