利用C++语言实现了三维地形的构建、漫游、渲染及裂缝处理等功能，代码结构清晰，注释完善，适合新手学习(C++ language is used to realize the functions of 3D terrain construction, roaming, rendering and crack processing. The code structure is clear and the annotation is perfect, which is suitable for beginners to learn)