Chapter 9

Physically Based Shading

“Let the form of an object be what it may,—light, shade, and perspective will always make it beautiful.”

—John Constable

In this chapter we cover the various aspects of physically based shading. We start with a description of the physics of light-matter interaction in Section 9.1, and in Sections 9.2 to 9.4 we show how these physics connect to the shading process. Sections 9.5 to 9.7 are dedicated to the building blocks used to construct physically based shading models, and the models themselves—covering a broad variety of material types—are discussed in Sections 9.8 to 9.12. Finally, in Section 9.13 we describe how materials are blended together, and we cover filtering methods for avoiding aliasing and preserving ...

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