说明：  OpenSceneGraph教程 本页面将帮助新用户逐步有目的地学习OSG的各方面内容。这里的教程与示例代码不同，它们主要是由文字和口头（视频教程）的编程指南组成。
(OpenSceneGraph Tutorials This page will help new users learn the destination step by step in all aspects of OSG. Tutorials and sample code here is different from them mainly by the written and oral (video tutorial) composed of the programming guide.)