实现三维地形模拟。地形网格采用随机网格生成法，在地形的绘制中采用多阶曲线插值的方法，最后采用三角形近似和纹理贴图。-3D terrain simulation. Terrain mesh using random mesh generation method, in terrain rendering using multi-order curve interpolation method, and finally the triangle approximation and texture.