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vote
Normal Artifacts On Grazing Angles
According to learnopengl.com, the term $G(l, v, n)$ in the Cook-Torrance Specular BRDF can be written as
$$
G=\frac{n \cdot v}{(n \cdot v)(1-k)+k} \cdot \frac{n \cdot l}{(n \cdot l)(1-k)+k}
$$
and ...
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