d3d 开发的一款碰撞检测实例，包含多种的检测类型，如包围球包围盒，-d3d collect so you can do something to check your things can touch。

实现图形轮廓包围盒的描述。内容包括设置包围盒的线段，设置包围盒的最大最小点-Graphic descr iption of contours bounding box. Content includes the provision of bounding box of the segment, set the minimum bounding box of the largest point