diff options
Diffstat (limited to 'intern/cycles/kernel/shaders/node_fresnel.h')
| -rw-r--r-- | intern/cycles/kernel/shaders/node_fresnel.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/intern/cycles/kernel/shaders/node_fresnel.h b/intern/cycles/kernel/shaders/node_fresnel.h index 447a84255ef..9f10ba8023e 100644 --- a/intern/cycles/kernel/shaders/node_fresnel.h +++ b/intern/cycles/kernel/shaders/node_fresnel.h @@ -34,3 +34,16 @@ float fresnel_dielectric_cos(float cosi, float eta) return result; } +color fresnel_conductor(float cosi, color eta, color k) +{ + color cosi2 = color(cosi*cosi); + color one = color(1, 1, 1); + color tmp_f = eta * eta + k * k; + color tmp = tmp_f * cosi2; + color Rparl2 = (tmp - (2.0 * eta * cosi) + one) / + (tmp + (2.0 * eta * cosi) + one); + color Rperp2 = (tmp_f - (2.0 * eta * cosi) + cosi2) / + (tmp_f + (2.0 * eta * cosi) + cosi2); + return (Rparl2 + Rperp2) * 0.5; +} + |