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；

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

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此通道还负责渲染着色器中的光照贴图，环境光和自发光。

This pass also adds any lightmaps, ambient and emissive lighting from the shader.

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本系统通过简单的建模、多种贴图方式以及导入3d模型来近似地描述大型环境，具有较强的实用性、较好的实时性和显示效果。

Through simple modeling, multiple mapping ways and import 3d model to describe large-scale indoor environment, this paper presents a practical, real-time virtual scene construction system.

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