forked from bartvdbraak/blender
40 lines
1.3 KiB
Plaintext
40 lines
1.3 KiB
Plaintext
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/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "stdosl.h"
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shader node_refraction_bsdf(
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color Color = color(0.8, 0.8, 0.8),
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string distribution = "Sharp",
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float Roughness = 0.2,
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float IOR = 1.45,
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normal Normal = N,
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output closure color BSDF = diffuse(Normal))
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{
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float f = max(IOR, 1.0 + 1e-5);
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float eta = backfacing() ? 1.0 / f: f;
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if (distribution == "Sharp")
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BSDF = Color * refraction(Normal, eta);
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else if (distribution == "Beckmann")
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BSDF = Color * microfacet_beckmann_refraction(Normal, Roughness, eta);
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else if (distribution == "GGX")
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BSDF = Color * microfacet_ggx_refraction(Normal, Roughness, eta);
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}
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