focus on 3d Terrien Programing书的电子版，介绍3D地形第一些LOD算法-focus on 3d Terrien Programing electronic version of the book introduces a number of 3D terrain LOD algorithm first

介绍3D地形编程的入门书籍。主要内容包括地形纹理映射，光照和阴影，地形Lod技术，GeoMipmap，四叉树算法，ROAM算法-Introduction 3D terrain introductory programming books. The main contents include terrain texture mapping, lighting and shadows, terrain Lod technology, GeoMipmap, quadtree algorithm, RO