Description: Easy language OpenGL tutorial forty-eighth lesson track ball source routine procedures combined with easy language OpenGL support library, call the API function to achieve the track ball effect.
点评：易语言OpenGL教程总共48课，现缺少22课凹凸映射，35课播放AVI，38课资源文件，45课顶点缓存，46课全屏反走样，47课CG顶点脚本等。后期有可能会补上，敬请期待。
Comments: easy language OpenGL tutorials a total of 48 classes, lack of lesson 22 bump mapping, play avi lesson 35, 38 class resource file, 45 class vertex buffer, 46 class full scene anti aliasing lesson 47 Cg Vertex scripts. Late may be up, please look forward to.
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第48课 轨迹球
.............\GL.ec
.............\GLU.ec
.............\WINGDI.ec
.............\WINUSER.ec
.............\源码使用说明.txt
.............\第48课 轨迹球.e
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