在此基础上，用水平射线切割有向环所形成的出入点对，实现对区域的填充。

Horizontal rays are used to cut the loops to form pairs of in points and out points, thus realizing the filling of region.

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其次，边界轮廓环的三角网格化：层间三角面片填充和端面三角划分。

Secondly, the triangle meshing of contour loops that includes triangle plane filling between layers and section triangle plotting was accomplished.

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您可以看到，所有环都填充。

As you can see, all the rings are filled.

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