ABGX

Format

ABGR,  ABGR_a,  ABGR_b,  ABGR_g,    ABGT,  ABGT_a,  ABGT_b,  ABGT_g // all float

The probability of a light ray being reflected by or transmitted through the surface according to ABg model, and the corresponding ABG coefficients.

Math

BSDF
$\frac{A}{B+|\sin \theta |^g}$