三维游戏高级图形编程中的纹理特效制作实例源代码，如高级纹理映射、Billboard、阴影、粒子系统、L系统以及三维游戏自然场景的特效生成算法（树、云、雾、烟、爆炸等等）-3D game graphics programming texture effects produced source code examples, such as the High texture mapping, Billboard, shadows, particle system, L 3D games and the