PBRT
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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_DIFFUSE_H 00037 #define PBRT_LIGHTS_DIFFUSE_H 00038 00039 // lights/diffuse.h* 00040 #include "pbrt.h" 00041 #include "light.h" 00042 #include "primitive.h" 00043 00044 // DiffuseAreaLight Declarations 00045 class DiffuseAreaLight : public AreaLight { 00046 public: 00047 // DiffuseAreaLight Public Methods 00048 DiffuseAreaLight(const Transform &light2world, 00049 const Spectrum &Le, int ns, const Reference<Shape> &shape); 00050 ~DiffuseAreaLight(); 00051 Spectrum L(const Point &p, const Normal &n, const Vector &w) const { 00052 return Dot(n, w) > 0.f ? Lemit : 0.f; 00053 } 00054 Spectrum Power(const Scene *) const; 00055 bool IsDeltaLight() const { return false; } 00056 float Pdf(const Point &, const Vector &) const; 00057 Spectrum Sample_L(const Point &P, float pEpsilon, const LightSample &ls, float time, 00058 Vector *wo, float *pdf, VisibilityTester *visibility) const; 00059 Spectrum Sample_L(const Scene *scene, const LightSample &ls, float u1, float u2, 00060 float time, Ray *ray, Normal *Ns, float *pdf) const; 00061 protected: 00062 // DiffuseAreaLight Protected Data 00063 Spectrum Lemit; 00064 ShapeSet *shapeSet; 00065 float area; 00066 }; 00067 00068 00069 AreaLight *CreateDiffuseAreaLight(const Transform &light2world, const ParamSet ¶mSet, 00070 const Reference<Shape> &shape); 00071 00072 #endif // PBRT_LIGHTS_DIFFUSE_H