00001 /* 00002 ----------------------------------------------------------------------------- 00003 This source file is part of OGRE 00004 (Object-oriented Graphics Rendering Engine) 00005 For the latest info, see http://www.ogre3d.org/ 00006 00007 Copyright ) 2002 Tels <http://bloodgate.com> based on EllipsoidEmitter 00008 Also see acknowledgements in Readme.html 00009 00010 This program is free software; you can redistribute it and/or modify it under 00011 the terms of the GNU Lesser General Public License as published by the Free Software 00012 Foundation; either version 2 of the License, or (at your option) any later 00013 version. 00014 00015 This program is distributed in the hope that it will be useful, but WITHOUT 00016 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 00017 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. 00018 00019 You should have received a copy of the GNU Lesser General Public License along with 00020 this program; if not, write to the Free Software Foundation, Inc., 59 Temple 00021 Place - Suite 330, Boston, MA 02111-1307, USA, or go to 00022 http://www.gnu.org/copyleft/lesser.txt. 00023 ----------------------------------------------------------------------------- 00024 */ 00025 #include "OgreCylinderEmitter.h" 00026 #include "OgreParticle.h" 00027 #include "OgreQuaternion.h" 00028 #include "OgreException.h" 00029 #include "OgreStringConverter.h" 00030 00031 00032 /* Implements an Emitter whose emitting points all lie inside a cylinder. 00033 */ 00034 00035 namespace Ogre { 00036 00037 00038 //----------------------------------------------------------------------- 00039 CylinderEmitter::CylinderEmitter() 00040 { 00041 initDefaults("Cylinder"); 00042 } 00043 //----------------------------------------------------------------------- 00044 void CylinderEmitter::_initParticle(Particle* pParticle) 00045 { 00046 Real x, y, z; 00047 00048 // Call superclass 00049 AreaEmitter::_initParticle(pParticle); 00050 00051 // First we create a random point inside a bounding cylinder with a 00052 // radius and height of 1 (this is easy to do). The distance of the 00053 // point from 0,0,0 must be <= 1 (== 1 means on the surface and we 00054 // count this as inside, too). 00055 00056 while (true) 00057 { 00058 /* ClearSpace not yet implemeted 00059 00060 */ 00061 // three random values for one random point in 3D space 00062 x = Math::SymmetricRandom(); 00063 y = Math::SymmetricRandom(); 00064 z = Math::SymmetricRandom(); 00065 00066 // the distance of x,y from 0,0 is sqrt(x*x+y*y), but 00067 // as usual we can omit the sqrt(), since sqrt(1) == 1 and we 00068 // use the 1 as boundary. z is not taken into account, since 00069 // all values in the z-direction are inside the cylinder: 00070 if ( x*x + y*y <= 1) 00071 { 00072 break; // found one valid point inside 00073 } 00074 } 00075 00076 // scale the found point to the cylinder's size and move it 00077 // relatively to the center of the emitter point 00078 00079 pParticle->mPosition = mPosition + 00080 + x * mXRange + y * mYRange + z * mZRange; 00081 00082 // Generate complex data by reference 00083 genEmissionColour(pParticle->mColour); 00084 genEmissionDirection(pParticle->mDirection); 00085 genEmissionVelocity(pParticle->mDirection); 00086 00087 // Generate simpler data 00088 pParticle->mTimeToLive = pParticle->mTotalTimeToLive = genEmissionTTL(); 00089 00090 } 00091 00092 } 00093 00094
Copyright © 2002-2003 by The OGRE Team
Last modified Sun Nov 28 19:48:18 2004