00001 00002 /* 00003 pbrt source code Copyright(c) 1998-2007 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 // light.cpp* 00025 #include "light.h" 00026 #include "scene.h" 00027 // Light Method Definitions 00028 Light::~Light() { 00029 } 00030 bool VisibilityTester::Unoccluded(const Scene *scene) const { 00031 // Update shadow ray statistics 00032 static StatsCounter nShadowRays("Lights", 00033 "Number of shadow rays traced"); 00034 ++nShadowRays; 00035 return !scene->IntersectP(r); 00036 } 00037 Spectrum VisibilityTester:: 00038 Transmittance(const Scene *scene) const { 00039 return scene->Transmittance(r); 00040 } 00041 Spectrum Light::Le(const RayDifferential &) const { 00042 return Spectrum(0.); 00043 }