[ios][opengles]OpenGL ES基础知识简介

参考: http://www.cnblogs.com/shangdahao/archive/2011/11/05/2233587.html

3D变换:模型,视图,投影与Viewport

http://www.cnblogs.com/kesalin/archive/2012/12/06/3D_math.html

原文地址:https://www.cnblogs.com/lyggqm/p/5016490.html