00001 /*************************************************************************** 00002 * Copyright (C) 1998-2007 by authors (see AUTHORS.txt ) * 00003 * * 00004 * This file is part of Lux Renderer. * 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.org * 00021 ***************************************************************************/ 00022 00023 #ifndef LUX_IRREGULARSPD_H 00024 #define LUX_IRREGULARSPD_H 00025 // irregular.h* 00026 #include "lux.h" 00027 #include "spectrum.h" 00028 #include "regular.h" 00029 00030 namespace lux 00031 { 00032 // only use spline for regular data 00033 enum SPDResamplingMethod { Linear, Spline }; 00034 00035 // Irregularly sampled SPD 00036 // Resampled to a fixed resolution (at construction) 00037 // using cubic spline interpolation 00038 class IrregularSPD : public SPD { 00039 public: 00040 00041 IrregularSPD() : SPD() {} 00042 00043 // creates an irregularly sampled SPD 00044 // may "truncate" the edges to fit the new resolution 00045 // wavelengths array containing the wavelength of each sample 00046 // samples array of sample values at the given wavelengths 00047 // n number of samples 00048 // resolution resampling resolution (in nm) 00049 IrregularSPD(const float* const wavelengths, const float* const samples, 00050 int n, int resolution = 5, SPDResamplingMethod resamplignMethod = Linear); 00051 00052 ~IrregularSPD() {} 00053 00054 protected: 00055 void init(float lMin, float lMax, const float* const s, int n); 00056 00057 private: 00058 // computes data for natural spline interpolation 00059 // from Numerical Recipes in C 00060 void calc_spline_data(const float* const wavelengths, 00061 const float* const amplitudes, int n, float *spline_data); 00062 }; 00063 00064 }//namespace lux 00065 00066 #endif // LUX_IRREGULARSPD_H