The collision detection passes three steps.Firstly, we detect if the root boxs of the dynamic objects intersect the children boxes of the octree to determine the possible intersection spaces quickly.

• 碰撞检测分为三步进行：首先检测活动对象的根包围盒与八叉树子节点包围盒是否相交来快速确定可能存在的物体相交区域；