root/OpenSceneGraph/trunk/src/osgParticle/ExplosionEffect.cpp @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13
14#include <osgParticle/ExplosionEffect>
15
16#include <osgParticle/ExplosionEffect>
17#include <osgParticle/ModularEmitter>
18#include <osgParticle/ModularProgram>
19#include <osgParticle/RandomRateCounter>
20#include <osgParticle/SectorPlacer>
21#include <osgParticle/RadialShooter>
22#include <osgParticle/AccelOperator>
23#include <osgParticle/FluidFrictionOperator>
24#include <osgParticle/ParticleSystemUpdater>
25
26#include <osg/Geode>
27
28using namespace osgParticle;
29
30ExplosionEffect::ExplosionEffect(bool automaticSetup):
31    ParticleEffect(automaticSetup)
32{
33    setDefaults();
34
35    _position.set(0.0f,0.0f,0.0f);
36    _scale = 1.0f;
37    _intensity = 1.0f;
38
39    _emitterDuration = 1.0;
40
41    if (_automaticSetup) buildEffect();
42}
43
44ExplosionEffect::ExplosionEffect(const osg::Vec3& position, float scale, float intensity)
45{
46    setDefaults();
47
48    _position = position;
49    _scale = scale;
50    _intensity = intensity;
51
52    _emitterDuration = 1.0;
53
54    if (_automaticSetup) buildEffect();
55}
56
57ExplosionEffect::ExplosionEffect(const ExplosionEffect& copy, const osg::CopyOp& copyop):
58    ParticleEffect(copy,copyop)
59{
60    if (_automaticSetup) buildEffect();
61}
62
63void ExplosionEffect::setDefaults()
64{
65    ParticleEffect::setDefaults();
66
67    _textureFileName = "Images/smoke.rgb";
68    _emitterDuration = 1.0;
69
70    // set up unit particle.
71    _defaultParticleTemplate.setLifeTime(0.5+0.1*_scale);
72    _defaultParticleTemplate.setSizeRange(osgParticle::rangef(0.75f, 3.0f));
73    _defaultParticleTemplate.setAlphaRange(osgParticle::rangef(0.1f, 1.0f));
74    _defaultParticleTemplate.setColorRange(osgParticle::rangev4(
75                                            osg::Vec4(1.0f, 0.8f, 0.2f, 1.0f),
76                                            osg::Vec4(1.0f, 0.4f, 0.1f, 0.0f)));
77
78}
79
80
81void ExplosionEffect::setUpEmitterAndProgram()
82{
83    // set up particle system
84    if (!_particleSystem)
85    {
86        _particleSystem = new osgParticle::ParticleSystem;
87    }
88
89    if (_particleSystem.valid())
90    {
91        _particleSystem->setDefaultAttributes(_textureFileName, false, false);
92
93        osgParticle::Particle& ptemplate = _particleSystem->getDefaultParticleTemplate();
94
95        float radius = 0.4f*_scale;
96        float density = 1.2f; // 1.0kg/m^3
97
98        ptemplate.setLifeTime(_defaultParticleTemplate.getLifeTime());
99
100        // the following ranges set the envelope of the respective
101        // graphical properties in time.
102        ptemplate.setSizeRange(osgParticle::rangef(radius*_defaultParticleTemplate.getSizeRange().minimum,
103                                                   radius*_defaultParticleTemplate.getSizeRange().maximum));
104        ptemplate.setAlphaRange(_defaultParticleTemplate.getAlphaRange());
105        ptemplate.setColorRange(_defaultParticleTemplate.getColorRange());
106
107        // these are physical properties of the particle
108        ptemplate.setRadius(radius);
109        ptemplate.setMass(density*radius*radius*radius*osg::PI*4.0f/3.0f);
110
111    }
112
113
114    // set up emitter
115    if (!_emitter)
116    {
117        _emitter = new osgParticle::ModularEmitter;
118        _emitter->setCounter(new osgParticle::RandomRateCounter);
119        _emitter->setPlacer(new osgParticle::SectorPlacer);
120        _emitter->setShooter(new osgParticle::RadialShooter);
121    }
122
123    if (_emitter.valid())
124    {
125        _emitter->setParticleSystem(_particleSystem.get());
126        _emitter->setReferenceFrame(_useLocalParticleSystem?
127                                    osgParticle::ParticleProcessor::ABSOLUTE_RF:
128                                    osgParticle::ParticleProcessor::RELATIVE_RF);
129
130        _emitter->setStartTime(_startTime);
131        _emitter->setLifeTime(_emitterDuration);
132        _emitter->setEndless(false);
133
134        osgParticle::RandomRateCounter* counter = dynamic_cast<osgParticle::RandomRateCounter*>(_emitter->getCounter());
135        if (counter)
136        {
137            counter->setRateRange(50*_intensity,100*_intensity);
138        }
139
140        osgParticle::SectorPlacer* placer = dynamic_cast<osgParticle::SectorPlacer*>(_emitter->getPlacer());
141        if (placer)
142        {
143            placer->setCenter(_position);
144            placer->setRadiusRange(0.0f*_scale,0.25f*_scale);
145        }
146
147        osgParticle::RadialShooter* shooter = dynamic_cast<osgParticle::RadialShooter*>(_emitter->getShooter());
148        if (shooter)
149        {
150            shooter->setThetaRange(0.0f, osg::PI_2);
151            shooter->setInitialSpeedRange(1.0f*_scale,10.0f*_scale);
152        }
153    }
154
155    // set up the program
156    if (!_program)
157    {
158        _program = new osgParticle::FluidProgram;
159    }
160
161    if (_program.valid())
162    {
163        _program->setParticleSystem(_particleSystem.get());
164        _program->setWind(_wind);
165    }
166
167}
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