lux: cooktorrance.h Source File

00001 /***************************************************************************
00002  *   Copyright (C) 1998-2009 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  *                                                                         *
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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_COOKTORRANCE_H
00024 #define LUX_COOKTORRANCE_H
00025 // cooktorrance.h*
00026 #include "lux.h"
00027 #include "bxdf.h"
00028 #include "spectrum.h"
00029 
00030 namespace lux
00031 {
00032 
00033 // Multilobe Cook-Torrance model
00034 class  CookTorrance : public BxDF {
00035 public:
00036   // CookTorrance Public Methods
00037   CookTorrance(const SWCSpectrum &ks, MicrofacetDistribution *dist, Fresnel *fres);
00038   virtual ~CookTorrance() { }
00039   virtual void f(const TsPack *tspack, const Vector &wo, const Vector &wi, SWCSpectrum *const f) const;
00040   float G(const Vector &wo, const Vector &wi, const Vector &wh) const;
00041   virtual bool Sample_f(const TsPack *tspack, const Vector &wi, Vector *sampled_f, float u1, float u2, SWCSpectrum *const f, float *pdf, float *pdfBack = NULL, bool reverse = false) const;
00042   virtual float Pdf(const TsPack *tspack, const Vector &wi, const Vector &wo) const;
00043 private:
00044   // Cook-Torrance Private Data
00045   const SWCSpectrum KS;
00046   MicrofacetDistribution *distribution;
00047   Fresnel *fresnel;
00048 };
00049 
00050 }//namespace lux
00051 
00052 #endif // LUX_COOKTORRANCE_H
00053