UG 3D软件的Grip编程函数。分析曲面的法向。-Grip UG 3D software programming function. Analysis of surface area.

在UG里全开和全关，以及单开，单关，加开，移动图层的GRIP源代码分享(In UG fully open and fully closed, and single, single, open, mobile layer GRIP source code sharing)