学习创建逼真的次表面皮肤着色器，适用于各种皮肤类型。

Learn to create realistic sub-surface skin shaders for a variety of skin types.

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着色器种类：表面，光源，置换，转换，体，图像。

Shader types: surface, light source, displacement, transformation, volume, image.

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本章介绍了加载纹理，将纹理映射到多边形表面和如何使用纹理着色器的基本知识。

You should now understand the basics of loading a texture, mapping it to a polygon face, and then rendering it with a shader.

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