用四叉树实现了LOD地形的绘制，当然，是四叉树，如果有需要了解的话，或者是想要做场景管理开发的话，建议必备，呵呵！其他的就不多说啦！代码才是真功夫！祝下载者体验愉快吧！-Use quadtree realized LOD terrain rendering, of course, is quad-tree, and if there is a need to know about it, or want to make scene, necessary management developmen