在加工具有大型复杂曲面的工件或对这些工件进行加工误差的检测时，都需要对曲面上的点进行测量。
When machining good-side workpiece or measuring its machining error, the points of these workpiece surface must be measured.
这样的2维宇宙模型就像是球体，不可能出现平行的测地线(测地线是曲面上的直线)——两直线必然在某点相交。
A two-dimensional model of such a universe would look like a sphere. It's impossible to have parallel geodesics (straight lines on a curved surface) — the two lines will cross at some point.
文摘：给出了一种基于等高线求解坡度约束下曲面上两点间最短路径的搜索算法。
Abstract: a path searching algorithm using contour is presented to obtain the shortest path between two points on a curved surface under the slope constraint.
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