Lecture 14: Intro to Material Modeling (34)
ijrsvt

I was pretty surprised to see how many materials are anisotropic. I initially thought it was only fairly metallic ones, but there are quite a few. It makes sense that it really depends on the structure of the material. This link has some more examples and explanations of the types of anisotropic reflections:

http://graphics.stanford.edu/courses/cs348b-06/lectures/reflection_iii/reflection_iii.pdf

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