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。
2
The approach starts from an analysis of spherical harmonics and finds out a quadratic polynomial form of environment mapping.