BRDF CSV

theta_i,theta_r,phi,brdf
0,0,180,1.0536
30,30,180,1.3159
30,30,0,0.23899

Column	Unit	Accepted names
Incidence	degrees	theta_i, incidence, ti…
Emergence	degrees	theta_r, theta_o, theta_v, emergence…
Relative azimuth	degrees	phi, dphi, azimuth, relative_azimuth… — 180° = specular direction, 0° = back toward the source
BRDF	sr⁻¹	brdf, f_r, value
or reflectance factor	—	brf = π × BRDF

• Without a phi column, the samples are taken in the plane of incidence, forward scattering (φ = 180°).
• Incidence and emergence must be below 90°; values must be positive.
• At least 6 samples are needed; more is better: the coverage shows the share of the table actually measured.

Example: scripts/examples/brdf-glossy-white.csv — a synthetic white paint with a gloss, not a laboratory measurement.

How the table is built: Photometric model.