飞机漫游系统的两个修改版本，主要针对地形系统的修改。这里面包括了平面地形和高程数据的地形。其中，高程数据的地形是从RAW灰白图像文件中读取的。做的不好，请多原谅。有志OPENGL实现虚拟现实的朋友，都可以和我联系，大家一起进步。本人QQ：183971435(不诚勿扰）。谢谢！-Roaming aircraft modified version of the two systems, mainly for the terrain system changes. This includes a flat topography and terrain elevation data. Among them, the terrain elevation data from the RAW image files gray read. Do not, please forgive me. OPENGL aspiring to achieve virtual reality friends, and I can contact you with progress. I QQ: 183971435 (not sincere enough not to disturbance). Thanks!