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 // cylinder.cpp* 00024 #include "shape.h" 00025 // Cylinder Declarations 00026 00027 namespace lux 00028 { 00029 00030 class Cylinder: public Shape { 00031 public: 00032 // Cylinder Public Methods 00033 Cylinder(const Transform &o2w, bool ro, float rad, 00034 float zmin, float zmax, 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, 00041 Normal *Ns) const { 00042 float z = Lerp(u1, zmin, zmax); 00043 float t = u2 * phiMax; 00044 Point p = Point(radius * cosf(t), radius * sinf(t), z); 00045 *Ns = Normalize(ObjectToWorld(Normal(p.x, p.y, 0.))); 00046 if (reverseOrientation) *Ns *= -1.f; 00047 return ObjectToWorld(p); 00048 } 00049 00050 static Shape* CreateShape(const Transform &o2w, bool reverseOrientation, const ParamSet ¶ms); 00051 protected: 00052 // Cylinder Private Data 00053 float radius; 00054 float zmin, zmax; 00055 float phiMax; 00056 }; 00057 00058 }//namespace lux