forked from bartvdbraak/blender
da376e0237
Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
83 lines
2.2 KiB
Plaintext
83 lines
2.2 KiB
Plaintext
/*
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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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#include "node_texture.h"
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/* Voronoi */
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shader node_voronoi_texture(
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string DistanceMetric = "Actual Distance",
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string Coloring = "Intensity",
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float Weight1 = 1.0,
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float Weight2 = 0.0,
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float Weight3 = 0.0,
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float Weight4 = 0.0,
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float Exponent = 2.5,
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float Intensity = 1.0,
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float Size = 0.25,
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point Vector = P,
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output float Fac = 0.0,
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output color Color = color(0.0, 0.0, 0.0))
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{
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float exponent = max(Exponent, 1e-5);
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float size = nonzero(Size, 1e-5);
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float aw1 = fabs(Weight1);
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float aw2 = fabs(Weight2);
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float aw3 = fabs(Weight3);
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float aw4 = fabs(Weight4);
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float sc = (aw1 + aw2 + aw3 + aw4);
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if(sc != 0.0)
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sc = Intensity/sc;
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/* compute distance and point coordinate of 4 nearest neighbours */
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float da[4];
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point pa[4];
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voronoi(Vector/size, DistanceMetric, exponent, da, pa);
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/* Scalar output */
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Fac = sc * fabs(Weight1*da[0] + Weight2*da[1] + Weight3*da[2] + Weight4*da[3]);
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/* Colored output */
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if(Coloring == "Intensity") {
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Color = color(Fac, Fac, Fac);
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}
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else {
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Color = aw1*cellnoise_color(pa[0]);
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Color += aw2*cellnoise_color(pa[1]);
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Color += aw3*cellnoise_color(pa[2]);
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Color += aw4*cellnoise_color(pa[3]);
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if(Coloring != "Position") {
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float t1 = min((da[1] - da[0])*10.0, 1.0);
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if(Coloring == "Position, Outline, and Intensity")
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Color *= t1*Fac;
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else if(Coloring == "Position and Outline")
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Color *= t1*sc;
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}
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else {
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Color *= sc;
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}
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}
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}
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