The ( G(l,v) ), using the Smith model (GGX variant), ensures energy conservation:
A Comprehensive Analysis of V-Ray Material Models: Physically-Based Rendering, BRDF Microfacet Theory, and Stochastic Texture Evaluation vray materials
[ S(x_i, \omega_i; x_o, \omega_o) = F(\eta, \omega_i) R_d(|x_i - x_o|) F(\eta, \omega_o) ] The ( G(l,v) ), using the Smith model
Where ( \textFT ) is the Fourier Transform of the texture ( T ). V-Ray’s material system is compiled into a domain-specific intermediate representation (DSIR) before execution. Benchmarks show: The ( G(l
Where ( f_r ) is the VRay BRDF kernel, decomposed into diffuse and specular lobes:
For conductors (metals), V-Ray uses the ( \tilden = n + ik ), where ( k ) is the extinction coefficient: