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OgreCylinderEmitter.cpp

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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