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1·Restricts the effect to within a bounding sphere.

约速效果到一个边界球内。

2·The bounding sphere collision detection technique is used to achieve the realistic.

室内漫游采用包围球碰撞检测技术，实现了真实感漫游。

3·Just check in which cube your bounding sphere or box is and you will only have to check against those faces.

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。