PBRT
|
00001 00002 /* 00003 pbrt source code Copyright(c) 1998-2012 Matt Pharr and Greg Humphreys. 00004 00005 This file is part of pbrt. 00006 00007 Redistribution and use in source and binary forms, with or without 00008 modification, are permitted provided that the following conditions are 00009 met: 00010 00011 - Redistributions of source code must retain the above copyright 00012 notice, this list of conditions and the following disclaimer. 00013 00014 - Redistributions in binary form must reproduce the above copyright 00015 notice, this list of conditions and the following disclaimer in the 00016 documentation and/or other materials provided with the distribution. 00017 00018 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 00019 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 00020 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 00021 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 00022 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00023 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 00024 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 00025 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 00026 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 00027 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 00028 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00029 00030 */ 00031 00032 #if defined(_MSC_VER) 00033 #pragma once 00034 #endif 00035 00036 #ifndef PBRT_LIGHTS_GONIOMETRIC_H 00037 #define PBRT_LIGHTS_GONIOMETRIC_H 00038 00039 // lights/goniometric.h* 00040 #include "pbrt.h" 00041 #include "light.h" 00042 #include "shape.h" 00043 #include "scene.h" 00044 #include "mipmap.h" 00045 00046 // GonioPhotometricLight Declarations 00047 class GonioPhotometricLight : public Light { 00048 public: 00049 // GonioPhotometricLight Public Methods 00050 GonioPhotometricLight(const Transform &light2world, const Spectrum &, const 00051 string &texname); 00052 Spectrum Sample_L(const Point &p, float pEpsilon, const LightSample &ls, 00053 float time, Vector *wi, float *pdf, VisibilityTester *vis) const; 00054 ~GonioPhotometricLight() { delete mipmap; } 00055 bool IsDeltaLight() const { return true; } 00056 Spectrum Scale(const Vector &w) const { 00057 Vector wp = Normalize(WorldToLight(w)); 00058 swap(wp.y, wp.z); 00059 float theta = SphericalTheta(wp); 00060 float phi = SphericalPhi(wp); 00061 float s = phi * INV_TWOPI, t = theta * INV_PI; 00062 return (mipmap == NULL) ? 1.f : 00063 Spectrum(mipmap->Lookup(s, t, SPECTRUM_ILLUMINANT)); 00064 } 00065 Spectrum Power(const Scene *) const; 00066 Spectrum Sample_L(const Scene *scene, const LightSample &ls, float u1, float u2, 00067 float time, Ray *ray, Normal *Ns, float *pdf) const; 00068 float Pdf(const Point &, const Vector &) const; 00069 private: 00070 // GonioPhotometricLight Private Data 00071 Point lightPos; 00072 Spectrum Intensity; 00073 MIPMap<RGBSpectrum> *mipmap; 00074 }; 00075 00076 00077 GonioPhotometricLight *CreateGoniometricLight(const Transform &light2world, 00078 const ParamSet ¶mSet); 00079 00080 #endif // PBRT_LIGHTS_GONIOMETRIC_H