00001 00002 /* 00003 pbrt source code Copyright(c) 1998-2010 Matt Pharr and Greg Humphreys. 00004 00005 This file is part of pbrt. 00006 00007 pbrt is free software; you can redistribute it and/or modify 00008 it under the terms of the GNU General Public License as published by 00009 the Free Software Foundation; either version 2 of the License, or 00010 (at your option) any later version. Note that the text contents of 00011 the book "Physically Based Rendering" are *not* licensed under the 00012 GNU GPL. 00013 00014 pbrt is distributed in the hope that it will be useful, 00015 but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00017 GNU General Public License for more details. 00018 00019 You should have received a copy of the GNU General Public License 00020 along with this program. If not, see <http://www.gnu.org/licenses/>. 00021 00022 */ 00023 00024 00025 // volumes/homogeneous.cpp* 00026 #include "stdafx.h" 00027 #include "volumes/homogeneous.h" 00028 #include "paramset.h" 00029 00030 // HomogeneousVolumeDensity Method Definitions 00031 HomogeneousVolumeDensity *CreateHomogeneousVolumeDensityRegion(const Transform &volume2world, 00032 const ParamSet ¶ms) { 00033 // Initialize common volume region parameters 00034 Spectrum sigma_a = params.FindOneSpectrum("sigma_a", 0.); 00035 Spectrum sigma_s = params.FindOneSpectrum("sigma_s", 0.); 00036 float g = params.FindOneFloat("g", 0.); 00037 Spectrum Le = params.FindOneSpectrum("Le", 0.); 00038 Point p0 = params.FindOnePoint("p0", Point(0,0,0)); 00039 Point p1 = params.FindOnePoint("p1", Point(1,1,1)); 00040 return new HomogeneousVolumeDensity(sigma_a, sigma_s, g, Le, BBox(p0, p1), 00041 volume2world); 00042 } 00043 00044