PBRT
/home/felix/UBC/projects/AdaptiveLightfieldSampling/pbrt_v2/src/lights/spot.h
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_SPOT_H
00037 #define PBRT_LIGHTS_SPOT_H
00038 
00039 // lights/spot.h*
00040 #include "pbrt.h"
00041 #include "light.h"
00042 #include "shape.h"
00043 
00044 // SpotLight Declarations
00045 class SpotLight : public Light {
00046 public:
00047     // SpotLight Public Methods
00048     SpotLight(const Transform &light2world, const Spectrum &, float width, float fall);
00049     Spectrum Sample_L(const Point &p, float pEpsilon, const LightSample &ls, float time,
00050         Vector *wi, float *pdf, VisibilityTester *vis) const;
00051     bool IsDeltaLight() const { return true; }
00052     float Falloff(const Vector &w) const;
00053     Spectrum Power(const Scene *) const;
00054     Spectrum Sample_L(const Scene *scene, const LightSample &ls,
00055         float u1, float u2, float time, Ray *ray, Normal *Ns, float *pdf) const;
00056     float Pdf(const Point &, const Vector &) const;
00057 private:
00058     // SpotLight Private Data
00059     Point lightPos;
00060     Spectrum Intensity;
00061     float cosTotalWidth, cosFalloffStart;
00062 };
00063 
00064 
00065 SpotLight *CreateSpotLight(const Transform &l2w, const ParamSet &paramSet);
00066 
00067 #endif // PBRT_LIGHTS_SPOT_H