00001 /*************************************************************************** 00002 * Copyright (C) 1998-2008 by authors (see AUTHORS.txt ) * 00003 * * 00004 * This file is part of LuxRender. * 00005 * * 00006 * Lux Renderer is free software; you can redistribute it and/or modify * 00007 * it under the terms of the GNU General Public License as published by * 00008 * the Free Software Foundation; either version 3 of the License, or * 00009 * (at your option) any later version. * 00010 * * 00011 * Lux Renderer is distributed in the hope that it will be useful, * 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * 00014 * GNU General Public License for more details. * 00015 * * 00016 * You should have received a copy of the GNU General Public License * 00017 * along with this program. If not, see <http://www.gnu.org/licenses/>. * 00018 * * 00019 * This project is based on PBRT ; see http://www.pbrt.org * 00020 * Lux Renderer website : http://www.luxrender.net * 00021 ***************************************************************************/ 00022 00023 #ifndef LUX_NULLTRANSMISSION_H 00024 #define LUX_NULLTRANSMISSION_H 00025 // nulltransmission.h* 00026 #include "lux.h" 00027 #include "bxdf.h" 00028 #include "spectrum.h" 00029 00030 namespace lux 00031 { 00032 00033 class NullTransmission : public BxDF { 00034 public: 00035 // NullTransmission Public Methods 00036 NullTransmission() 00037 : BxDF(BxDFType(BSDF_TRANSMISSION | BSDF_SPECULAR)) {} 00038 SWCSpectrum f(const Vector &wo, const Vector &wi) const { 00039 return wo == -wi ? SWCSpectrum(1.f / fabsf(CosTheta(wi))) : SWCSpectrum(0.); 00040 } 00041 SWCSpectrum Sample_f(const Vector &wo, Vector *wi, float u1, float u2, float *pdf, float *pdfBack = NULL) const; 00042 float Pdf(const Vector &wo, const Vector &wi) const { 00043 return wo == -wi ? 1.f : 0.f; 00044 } 00045 private: 00046 // NullTransmission Private Data 00047 }; 00048 00049 }//namespace lux 00050 00051 #endif // LUX_NULLTRANSMISSION_H 00052