运用基于块和三角形面片的混合裁剪模式，结合简化的高度差投影计算方法，快速选取适合的地形节点；
Hybrid culling technique based on blocks and triangle faces and simplified computing method for screen-space errors are employed to select appropriate terrain nodes rapidly.
并对其生成的表面几何模型所包含三角面片数量巨大的问题，提出一种快速有效的三角形边收缩算法进行网格简化，提高了表面模型的绘制速度。
Because 3D surface model contains huge number of triangles, a mesh simplification algorithm based on triangle edges shrinkages is presented in this paper to speed up the rendering in real time.
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