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.
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@ -111,14 +111,16 @@ ccl_device float fresnel_dielectric_cos(float cosi, float eta)
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return 1.0f; // TIR(no refracted component)
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}
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ccl_device float fresnel_conductor(float cosi, float eta, float k)
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ccl_device float3 fresnel_conductor(float cosi, const float3 eta, const float3 k)
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{
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float tmp_f = eta * eta + k * k;
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float tmp = tmp_f * cosi * cosi;
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float Rparl2 = (tmp - (2.0f * eta * cosi) + 1)/
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(tmp + (2.0f * eta * cosi) + 1);
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float Rperp2 = (tmp_f - (2.0f * eta * cosi) + cosi * cosi)/
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(tmp_f + (2.0f * eta * cosi) + cosi * cosi);
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float3 cosi2 = make_float3(cosi*cosi);
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float3 one = make_float3(1.0f, 1.0f, 1.0f);
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float3 tmp_f = eta * eta + k * k;
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float3 tmp = tmp_f * cosi2;
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float3 Rparl2 = (tmp - (2.0f * eta * cosi) + one) /
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(tmp + (2.0f * eta * cosi) + one);
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float3 Rperp2 = (tmp_f - (2.0f * eta * cosi) + cosi2) /
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(tmp_f + (2.0f * eta * cosi) + cosi2);
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return(Rparl2 + Rperp2) * 0.5f;
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}
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@ -34,3 +34,16 @@ float fresnel_dielectric_cos(float cosi, float eta)
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return result;
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}
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color fresnel_conductor(float cosi, color eta, color k)
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{
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color cosi2 = color(cosi*cosi);
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color one = color(1, 1, 1);
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color tmp_f = eta * eta + k * k;
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color tmp = tmp_f * cosi2;
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color Rparl2 = (tmp - (2.0 * eta * cosi) + one) /
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(tmp + (2.0 * eta * cosi) + one);
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color Rperp2 = (tmp_f - (2.0 * eta * cosi) + cosi2) /
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(tmp_f + (2.0 * eta * cosi) + cosi2);
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return (Rparl2 + Rperp2) * 0.5;
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}
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@ -0,0 +1,38 @@
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/*
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* Copyright 2011-2014 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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color fresnel_conductor(float cosi, color eta, color k)
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{
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color cosi2 = color(cosi*cosi);
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color one = color(1, 1, 1);
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color tmp_f = eta * eta + k * k;
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color tmp = tmp_f * cosi2;
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color Rparl2 = (tmp - (2.0 * eta * cosi) + one) /
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(tmp + (2.0 * eta * cosi) + one);
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color Rperp2 = (tmp_f - (2.0 * eta * cosi) + cosi2) /
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(tmp_f + (2.0 * eta * cosi) + cosi2);
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return (Rparl2 + Rperp2) * 0.5;
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}
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shader node_fresnel_conductive(
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color n = color(0.084136, 0.410708, 1.472421),
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color k = color(4.018579, 2.363371, 1.607574),
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normal Normal = N,
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output color Color = color(0.8, 0.8, 0.8))
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{
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float cosi = dot(I, Normal);
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Color = fresnel_conductor(cosi, n, k);
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}
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