Aim to introduce the basic concepts of environment mapping in D3D, and detailedly discuss the process of using D3D to realize cubic and spherical environment mapping.
目的介绍D3D中环境映射的基本概念，详细论述用D3D实现立方体环境映射和球面环境映射的过程。
The approach starts from an analysis of spherical harmonics and finds out a quadratic polynomial form of environment mapping.
该方法从分析球面调和函数入手，首先得出环境贴图的二次多项式表达形式；
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