forked from bartvdbraak/blender
47 lines
1.3 KiB
Plaintext
47 lines
1.3 KiB
Plaintext
/*
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* Copyright 2012, 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_light_falloff(
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float Strength = 0.0,
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float Smooth = 0.0,
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output float Quadratic = 0.0,
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output float Linear = 0.0,
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output float Constant = 0.0)
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{
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float ray_length = 0.0;
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float strength = Strength;
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getattribute("path:ray_length", ray_length);
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if (Smooth > 0.0) {
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float squared = ray_length * ray_length;
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strength *= squared / (Smooth + squared);
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}
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/* Quadratic */
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Quadratic = strength;
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/* Linear */
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Linear = (strength * ray_length);
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/* Constant */
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Constant = (strength * ray_length * ray_length);
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}
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