Vray Materials [2021] May 2026

[ S(x_i, \omega_i; x_o, \omega_o) = F(\eta, \omega_i) R_d(|x_i - x_o|) F(\eta, \omega_o) ]

For conductors (metals), V-Ray uses the ( \tilden = n + ik ), where ( k ) is the extinction coefficient: vray materials

[ \mathbbV[L] \propto \frac1N \sum_k=1^N \fracf(\omega_k)p(\omega_k) \cdot \texttrunc_L(\textFTT(u,v)) ] [ S(x_i, \omega_i; x_o, \omega_o) = F(\eta, \omega_i)

Where ( f_r ) is the VRay BRDF kernel, decomposed into diffuse and specular lobes: \omega_o) = F(\eta

[ D_GGX(m) = \frac\alpha^2\pi \left( (n \cdot m)^2 (\alpha^2 - 1) + 1 \right)^2 ]

| Material Complexity | CPU (AVX-512) | GPU (NVIDIA RTX) | Bottleneck | |---------------------|---------------|------------------|-------------| | Simple Lambertian | 100% | 85% | Thread sync | | GGX + 2 textures | 100% | 210% (faster) | Texture fetch latency | | SSS + displacement | 100% | 45% (slower) | Divergent threads |