diff options
author | Thomas Dinges <blender@dingto.org> | 2014-09-07 20:28:59 +0400 |
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committer | Thomas Dinges <blender@dingto.org> | 2014-09-07 20:28:59 +0400 |
commit | aa8d25bf09c7ef952688eee51896fa3c4a02c989 (patch) | |
tree | 890948abdc275d077f4386bc21f6a1861c10f47f /intern/cycles | |
parent | 2633d0fac592ea6d9157a50c2ab25778ecc5b532 (diff) |
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.
Diffstat (limited to 'intern/cycles')
-rw-r--r-- | intern/cycles/kernel/closure/bsdf_util.h | 16 | ||||
-rw-r--r-- | intern/cycles/kernel/shaders/node_fresnel.h | 13 |
2 files changed, 22 insertions, 7 deletions
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; +} + |