47 lines
1.8 KiB
GLSL
47 lines
1.8 KiB
GLSL
/**
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*
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* RenderPipeline
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*
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* Copyright (c) 2014-2016 tobspr <tobias.springer1@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*/
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#pragma once
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/*
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From:
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http://www.iryoku.com/translucency/
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*/
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const float skin_travel_weight = 1.0;
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vec3 skin_transmittance(float distance_through_medium) {
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float s = distance_through_medium * skin_travel_weight;
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float s_sq = -s * s;
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vec3 t = vec3(0.233, 0.455, 0.649) * exp(s_sq / 0.0064) +
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vec3(0.1, 0.336, 0.344) * exp(s_sq / 0.0484) +
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vec3(0.118, 0.198, 0.0) * exp(s_sq / 0.187) +
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vec3(0.113, 0.007, 0.007) * exp(s_sq / 0.567) +
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vec3(0.358, 0.004, 0.0) * exp(s_sq / 1.99) +
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vec3(0.078, 0.0, 0.0) * exp(s_sq / 7.41);
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return t;
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}
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