Vray Materials May 2026

[ f_r = f_diffuse + f_specular ] For perfectly rough surfaces, V-Ray defaults to the Lambertian model (constant albedo). However, for rough, clay-like materials, V-Ray implements the Oren-Nayar model, which accounts for retro-reflection:

Where ( f_r ) is the VRay BRDF kernel, decomposed into diffuse and specular lobes: vray materials

The ( G(l,v) ), using the Smith model (GGX variant), ensures energy conservation: [ f_r = f_diffuse + f_specular ] For

[ \mathbbV[L] \propto \frac1N \sum_k=1^N \fracf(\omega_k)p(\omega_k) \cdot \texttrunc_L(\textFTT(u,v)) ] V-Ray implements the Oren-Nayar model

[ F_conductor = \frac(n^2 + k^2) - 2n\cos\theta + \cos^2\theta(n^2 + k^2) + 2n\cos\theta + \cos^2\theta ]