If the interpolated curves intersect at point v, we can design a full symmetric triangle mesh at point v.
若要插值多条相交曲线只需在交点处构造全对称三角网格。
The elevation of the point can be interpolated by means of the triangle first.
它先产生一个包含插值点在内的内插三角形，然后利用此三角形来内插插值点高程；
The elevation of the point can be interpolated by means of the triangle first.
它先产生一个包含插值点在内的内插三角形，然后利用此三角形来内插插值点高程；
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