From aa8d25bf09c7ef952688eee51896fa3c4a02c989 Mon Sep 17 00:00:00 2001 From: Thomas Dinges Date: Sun, 7 Sep 2014 18:28:59 +0200 Subject: Cycles / OSL: Add a conductive fresnel shader template. This adds a fresnel conductive OSL preset to the Text Editor. Based on a patch by Lukas Stockner. Differential revision: https://developer.blender.org/D145 See the differential for details. --- intern/cycles/kernel/closure/bsdf_util.h | 16 +++++++++------- intern/cycles/kernel/shaders/node_fresnel.h | 13 +++++++++++++ 2 files changed, 22 insertions(+), 7 deletions(-) (limited to 'intern') diff --git a/intern/cycles/kernel/closure/bsdf_util.h b/intern/cycles/kernel/closure/bsdf_util.h index b3dcb9dcc38..6851dca309b 100644 --- a/intern/cycles/kernel/closure/bsdf_util.h +++ b/intern/cycles/kernel/closure/bsdf_util.h @@ -111,14 +111,16 @@ ccl_device float fresnel_dielectric_cos(float cosi, float eta) return 1.0f; // TIR(no refracted component) } -ccl_device float fresnel_conductor(float cosi, float eta, float k) +ccl_device float3 fresnel_conductor(float cosi, const float3 eta, const float3 k) { - float tmp_f = eta * eta + k * k; - float tmp = tmp_f * cosi * cosi; - float Rparl2 = (tmp - (2.0f * eta * cosi) + 1)/ - (tmp + (2.0f * eta * cosi) + 1); - float Rperp2 = (tmp_f - (2.0f * eta * cosi) + cosi * cosi)/ - (tmp_f + (2.0f * eta * cosi) + cosi * cosi); + float3 cosi2 = make_float3(cosi*cosi); + float3 one = make_float3(1.0f, 1.0f, 1.0f); + float3 tmp_f = eta * eta + k * k; + float3 tmp = tmp_f * cosi2; + float3 Rparl2 = (tmp - (2.0f * eta * cosi) + one) / + (tmp + (2.0f * eta * cosi) + one); + float3 Rperp2 = (tmp_f - (2.0f * eta * cosi) + cosi2) / + (tmp_f + (2.0f * eta * cosi) + cosi2); return(Rparl2 + Rperp2) * 0.5f; } 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; +} + -- cgit v1.2.3