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<hr><h1>OgreEllipsoidEmitter.cpp</h1><a href="OgreEllipsoidEmitter_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><pre>00001 <font class="comment">/*</font>
00002 <font class="comment">-----------------------------------------------------------------------------</font>
00003 <font class="comment">This source file is part of OGRE</font>
00004 <font class="comment"> (Object-oriented Graphics Rendering Engine)</font>
00005 <font class="comment">For the latest info, see http://www.ogre3d.org/</font>
00006 <font class="comment"></font>
00007 <font class="comment">Copyright ) 2002 Tels <http://bloodgate.com> based on BoxEmitter</font>
00008 <font class="comment">Also see acknowledgements in Readme.html</font>
00009 <font class="comment"></font>
00010 <font class="comment">This program is free software; you can redistribute it and/or modify it under</font>
00011 <font class="comment">the terms of the GNU Lesser General Public License as published by the Free Software</font>
00012 <font class="comment">Foundation; either version 2 of the License, or (at your option) any later</font>
00013 <font class="comment">version.</font>
00014 <font class="comment"></font>
00015 <font class="comment">This program is distributed in the hope that it will be useful, but WITHOUT</font>
00016 <font class="comment">ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS</font>
00017 <font class="comment">FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.</font>
00018 <font class="comment"></font>
00019 <font class="comment">You should have received a copy of the GNU Lesser General Public License along with</font>
00020 <font class="comment">this program; if not, write to the Free Software Foundation, Inc., 59 Temple</font>
00021 <font class="comment">Place - Suite 330, Boston, MA 02111-1307, USA, or go to</font>
00022 <font class="comment">http://www.gnu.org/copyleft/lesser.txt.</font>
00023 <font class="comment">-----------------------------------------------------------------------------</font>
00024 <font class="comment">*/</font>
00025 <font class="preprocessor">#include "<a class="code" href="OgreEllipsoidEmitter_8h.html">OgreEllipsoidEmitter.h</a>"</font>
00026 <font class="preprocessor">#include "<a class="code" href="OgreParticle_8h.html">OgreParticle.h</a>"</font>
00027 <font class="preprocessor">#include "<a class="code" href="OgreException_8h.html">OgreException.h</a>"</font>
00028 <font class="preprocessor">#include "<a class="code" href="OgreStringConverter_8h.html">OgreStringConverter.h</a>"</font>
00029
00030
00031 <font class="comment">/* Implements an Emitter whose emitting points all lie inside an ellipsoid.</font>
00032 <font class="comment"> See <http://mathworld.wolfram.com/Ellipsoid.html> for mathematical details.</font>
00033 <font class="comment"></font>
00034 <font class="comment"> If the lengths of two axes of an ellipsoid are the same, the figure is</font>
00035 <font class="comment"> called a 'spheroid' (depending on whether c < a or c > a, an 'oblate</font>
00036 <font class="comment"> spheroid' or 'prolate spheroid', respectively), and if all three are the</font>
00037 <font class="comment"> same, it is a 'sphere' (ball).</font>
00038 <font class="comment">*/</font>
00039
00040 <font class="keyword">namespace </font>Ogre {
00041
00042
00043 <font class="comment">//-----------------------------------------------------------------------</font>
<a name="l00044"></a><a class="code" href="classOgre_1_1EllipsoidEmitter.html#Ogre_1_1EllipsoidEmittera0">00044</a> EllipsoidEmitter::EllipsoidEmitter()
00045 {
00046 <a class="code" href="classOgre_1_1AreaEmitter.html#Ogre_1_1RingEmitterb1">initDefaults</a>(<font class="stringliteral">"Ellipsoid"</font>);
00047 }
00048 <font class="comment">//-----------------------------------------------------------------------</font>
<a name="l00049"></a><a class="code" href="classOgre_1_1EllipsoidEmitter.html#Ogre_1_1EllipsoidEmittera1">00049</a> <font class="keywordtype">void</font> EllipsoidEmitter::_initParticle(<a class="code" href="classOgre_1_1Particle.html">Particle</a>* pParticle)
00050 {
00051 <a class="code" href="namespaceOgre.html#a349">Real</a> x, y, z;
00052
00053 <font class="comment">// Call superclass</font>
00054 AreaEmitter::_initParticle(pParticle);
00055 <font class="comment">// First we create a random point inside a bounding sphere with a</font>
00056 <font class="comment">// radius of 1 (this is easy to do). The distance of the point from</font>
00057 <font class="comment">// 0,0,0 must be <= 1 (== 1 means on the surface and we count this as</font>
00058 <font class="comment">// inside, too).</font>
00059
00060 <font class="keywordflow">while</font> (true)
00061 {
00062 <font class="comment">// three random values for one random point in 3D space</font>
00063
00064 x = Math::SymmetricRandom();
00065 y = Math::SymmetricRandom();
00066 z = Math::SymmetricRandom();
00067
00068 <font class="comment">// the distance of x,y,z from 0,0,0 is sqrt(x*x+y*y+z*z), but</font>
00069 <font class="comment">// as usual we can omit the sqrt(), since sqrt(1) == 1 and we</font>
00070 <font class="comment">// use the 1 as boundary:</font>
00071 <font class="keywordflow">if</font> ( x*x + y*y + z*z <= 1)
00072 {
00073 <font class="keywordflow">break</font>; <font class="comment">// found one valid point inside</font>
00074 }
00075 }
00076
00077 <font class="comment">// scale the found point to the ellipsoid's size and move it</font>
00078 <font class="comment">// relatively to the center of the emitter point</font>
00079
00080 pParticle-><a class="code" href="classOgre_1_1Billboard.html#Ogre_1_1Particlem3">mPosition</a> = <a class="code" href="classOgre_1_1ParticleEmitter.html#Ogre_1_1RingEmittern6">mPosition</a> +
00081 + x * <a class="code" href="classOgre_1_1AreaEmitter.html#Ogre_1_1RingEmittern3">mXRange</a> + y * <a class="code" href="classOgre_1_1AreaEmitter.html#Ogre_1_1RingEmittern4">mYRange</a> + z * <a class="code" href="classOgre_1_1AreaEmitter.html#Ogre_1_1RingEmittern5">mZRange</a>;
00082
00083 <font class="comment">// Generate complex data by reference</font>
00084 <a class="code" href="classOgre_1_1ParticleEmitter.html#Ogre_1_1RingEmitterb5">genEmissionColour</a>(pParticle-><a class="code" href="classOgre_1_1Billboard.html#Ogre_1_1Particlem6">mColour</a>);
00085 <a class="code" href="classOgre_1_1ParticleEmitter.html#Ogre_1_1RingEmitterb2">genEmissionDirection</a>(pParticle-><a class="code" href="classOgre_1_1Billboard.html#Ogre_1_1Particlem4">mDirection</a>);
00086 <a class="code" href="classOgre_1_1ParticleEmitter.html#Ogre_1_1RingEmitterb3">genEmissionVelocity</a>(pParticle-><a class="code" href="classOgre_1_1Billboard.html#Ogre_1_1Particlem4">mDirection</a>);
00087
00088 <font class="comment">// Generate simpler data</font>
00089 pParticle-><a class="code" href="classOgre_1_1Particle.html#Ogre_1_1Particlem0">mTimeToLive</a> = pParticle-><a class="code" href="classOgre_1_1Particle.html#Ogre_1_1Particlem1">mTotalTimeToLive</a> = <a class="code" href="classOgre_1_1ParticleEmitter.html#Ogre_1_1RingEmitterb4">genEmissionTTL</a>();
00090
00091 }
00092
00093 }
00094
00095
</pre></div><p>
Copyright © 2002-2003 by The OGRE Team<br />
Last modified Wed Jan 21 00:10:09 2004
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