如果你正在编写一个撞球游戏，你可以使用PickRaySegment表示撞球杆并使用BoundingSphere拣选以检查球与球之间的碰撞。
If you were writing a pool game you could use a PickRaySegment to represent the pool cue and you could pick with BoundingSphere to detecting collisions between the balls.
只检查你的碰撞球或者碰撞盒子所在的立方体，而且只需要检测那些面。
Just check in which cube your bounding sphere or box is and you will only have to check against those faces.
本文介绍“牛顿碰撞球”的有关实验，并用动力学普遍定理分析它的机理。
The experiment of "Newtons Cradle" is introduced and its principle is studied with the generalized theorem of dynamics.
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