Bruneton's wave spectrum is from "A unified directional spectrum for long and short wind-driven waves" by T. Elfouhaily, B. Chapron, K. Katsaros, D. V

Inverse of calcLogZNdc

Model the periodic dispersion relation, Section 3.2

Clamp z to keep vertex within far-plane of frustum, which effectivly disables far plane clipping. This is an alternative to glEnable(GL_DEPTH_CLAMP) i

Exact Schlick-smith V calculation. This is the visibility term, i.e the masking term (G) divided by the projected area. This does not incldue the divi

Fresnel from https://www.shadertoy.com/view/Ms2SD1 TODO: determine if this is a good cheep approximation or not

Calculates the maximum wave height based on trough to crest

Oren Nayer approximation from 'Beyond a Simple Physically Based Blinn-Phong Model in Real-Time' by Yoshiharu Gotanda. https://blog.selfshadow.com/publ

Phillips Spectrum modulated by wind speed and direction Section 3.3, equation 23

Schlick fresnel model

From https://www.geeks3d.com/hacklab/20190225/demo-checkerboard-in-glsl/