OBB树的建立，用于碰撞检测过程中的模型处理，提高效率-OBB tree establishment in the process of collision detection for model processing, improve efficiency

读取三维模型点集，构造OBB树，能判断两个三维点集有哪些点距离小于某个值-Reads the three-dimensional model point set, OBB tree structure that can determine two dimensional point set point distance which is less than a certain value