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.
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。
Gus stood at the table, toying with a cue stick, his eyes straying lazily over the billiard balls scattered about the table in the array of an unfinished game.
格斯站在桌旁，手里拿着一根弹球棒弄着玩，两眼懒洋洋地瞟着因一局未完而散在桌上各处的弹球。
Game Description: Our lost hero is out with his best buddy Blue ball. Together, the two balls manage to lose a treasure on an island. Can you help them reclaim their riches?
游戏描述：两个小球来到孤岛，寻找他们失散的伙伴，你能帮他们找到宝藏吗？
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