00001 /*************************************************************************** 00002 * Copyright (C) 1998-2008 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 * * 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.net * 00021 ***************************************************************************/ 00022 00023 #include "shape.h" 00024 #include "mc.h" 00025 00026 namespace lux 00027 { 00028 00029 // Disk Declarations 00030 class Disk : public Shape { 00031 public: 00032 // Disk Public Methods 00033 Disk(const Transform &o2w, bool ro, float height, 00034 float radius, float innerRadius, float phiMax); 00035 BBox ObjectBound() const; 00036 bool Intersect(const Ray &ray, float *tHit, 00037 DifferentialGeometry *dg) const; 00038 bool IntersectP(const Ray &ray) const; 00039 float Area() const; 00040 Point Sample(float u1, float u2, Normal *Ns) const { 00041 Point p; 00042 ConcentricSampleDisk(u1, u2, &p.x, &p.y); 00043 p.x *= radius; 00044 p.y *= radius; 00045 p.z = height; 00046 *Ns = Normalize(ObjectToWorld(Normal(0,0,1))); 00047 if (reverseOrientation) *Ns *= -1.f; 00048 return ObjectToWorld(p); 00049 } 00050 00051 static Shape* CreateShape(const Transform &o2w, bool reverseOrientation, const ParamSet ¶ms); 00052 private: 00053 // Disk Private Data 00054 float height, radius, innerRadius, phiMax; 00055 }; 00056 00057 }//namespace lux 00058
1.5.9