INNER CODE UNIT · Python
Lz
SedulousWorks/SedulousEngine · Scripts/generate_brdf_lut.py:103
Lz = 2.0 * VdotH * Hz[None, :] - Vz[:, None]
NdotL = np.maximum(Lz, 0.0)
NdotH = np.maximum(Hz[None, :] * np.ones((SIZE, 1)), 0.0)
# Only contributing samples (NdotL > 0) accumulate.
mask = NdotL > 0.0
# Smith GGX geometry term (split-sum form).
gv = ndot_v[:, None] / (ndot_v[:, None] * (1.0 - k) + k)
gl = NdotL / (NdotL * (1.0 - k) + k + 1e-10)
G = gv * gl
# G_Vis = G * VdotH / (NdotH * NdotV + epsilon).
G_Vis = (G * VdotH) / (NdotH * ndot_v[:, None] + 0.0001)
# Schlick Fresnel split: Fc = (1 - VdotH)^5.
Fc = np.power(np.maximum(1.0 - VdotH, 0.0), 5.0)