The animation programs of the making revolution surface is compiled, and a general coordinateformula of geometric transformation is deduced about an arbitrary revolution curve around a rotation axis.
给出旋转曲面生成过程的动画程序，并导出了任一曲线绕任意轴旋转的坐标间几何变换公式。
2
To detect the number of intersections to the right from a point that is not aligned with a vertex, start with the formula of the coordinate where the horizontal line intersects a segment (Xi).
要检测未与一个顶点对其的一个点右侧的交点数量，首先使用水平线与一个线段(Xi)相交的坐标公式。
3
This paper is taking gear grinding as example, use gear engagement principle to establish the coordinate Y7125 gear grinder, deduced line formula for gear grinding engagement.