一个用Dirext9写的天空盒。代码使用了3D框架，演示了天空盒算法。-Used to write a Dirext9 sky box. Code uses a 3D fr a mework, demonstrating the sky box algorithm.

dirext入门程序，使用dirext9显示2d图片。-dirext entry procedures, the use of 2d images dirext9 show.