[ios][opengles]OpenGL ES基础知识简介
参考: http://www.cnblogs.com/shangdahao/archive/2011/11/05/2233587.html
http://www.cnblogs.com/kesalin/archive/2012/12/06/3D_math.html
参考: http://www.cnblogs.com/shangdahao/archive/2011/11/05/2233587.html
http://www.cnblogs.com/kesalin/archive/2012/12/06/3D_math.html