forked from bartvdbraak/blender
39 lines
1.3 KiB
Plaintext
39 lines
1.3 KiB
Plaintext
/*
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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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