Geometry Function in the specular BRDF term is defined as $G(l, v, h)$. Why need a $h$ since $h=\frac{l+v}2$.

$f_{spec}(l,v) = \frac{F(h,v)G_2(l,v,h)D(h)}{4|n\cdot l||n\cdot v|}$ from "Real Time Rendering 4th" Chap 9.8 BRDF Models for Surface Reflection.

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    $\begingroup$ @trichoplax I've updated the complete equation. Thanks! $\endgroup$ – zoujyjs Apr 19 at 2:25

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