The coordinates in 3d space of every contour point be derived, depending on the relative positions and 2d coordinates of the contour points.
依据各断层的相对位置及每断层中轮廓点的二维坐标，求出每个轮廓点在三维重建空间的坐标。
The enveloping line for the relative motion of empty bottle to star gear is the theoretical basis for the design of star gear contour line.
空瓶对星轮相对运动的包络线是设计星轮轮廓曲线的理论基础。
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