三角形逼近球体演示 原理：先用正三角形逼近绘出20面体，然后递归分割，把每个面分割为4个三角形(递归次数可定),此以来逼近球体。-spherical approximation triangle demonstration tenets : first approximation using regular triangle charted 20 Verses, and then recursive segmentation, each side of the divided four t

采用三角形逐次逼近法绘制球体，可在此基础上贴纹理

该程序实现了一个LOD编程实例，根据视点与对象的距离，以不同的网格数来绘制球体，程序中球体表面是通过若干三角形来逼近的。-The program implements a LOD programming examples, according to the distance between the target point of view and in different grid to draw a number of spheres, spherical surface is the pro