visibility of a point

To study the intersection visibility of two general place planes, this paper set the planes as two faces of front and backs from the point of projection character of a space plane.

为了研究两平面相交可见性的规律，从空间一个平面的投影特点入手，将平面分别设定为正面、背面两面，讨论平面图形各顶点投影顺序与平面正面、背面的投影所具有的内在规律。

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People explore a method to plan an optimal collision free path from start point to destination point in short time. The visibility graph method, artificial potential field method, genetic algorithm and many other kinds of obstacle avoidance path planning algorithm are proposed.

人们对如何快速找到一条从起点到目标点的最优无碰路径进行了多方探索，提出了可视图法、人工势场法、遗传算法等多种避障路径规划算法。

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The present dissertation puts forward a weak visibility computing method of NURBS curve based on Voronoi diagram of polygons and a method for computing visible polygons of a point which move along curvilinear path.

本文提出一种基于多边形Voronoi图的NURBS曲线的弱可见性计算方法，并给出计算沿曲线运动点的可见多边形的方法。

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