Hi,
Hi I´m trying to change my particle systems life time in run-time. To do that,
I started making a function setUp called once and a function update called
every frame. Inside the setUp function I create the particle system: I set the
shape, life time, size, mass, initial speed and so on.
Code:
void setUp(osg::Group *pRoot)
{
m_ParticleSystem = new osgParticle::ParticleSystem;
m_ParticleSystem->setDefaultAttributes("Fire.dds", false, false);
m_Geode = new osg::Geode;
m_Geode->addDrawable(m_ParticleSystem.get());
mRoot->addChild(m_Geode.get());
m_pSystemUpdater = new osgParticle::ParticleSystemUpdater;
m_pSystemUpdater->addParticleSystem(m_ParticleSystem.get());
mRoot->addChild(m_SystemUpdater.get());
m_myParticle = new osgParticle::Particle;
m_myParticle->setShape(osgParticle::Particle::QUAD);
m_myParticle->setSizeRange(osgParticle::rangef(0.2,0.2));
m_myParticle->setLifeTime(4);
m_myParticle->setMass(0.1);
m_ParticleSystem->setDefaultParticleTemplate(*m_myParticle);
m_Emitter = new osgParticle::ModularEmitter;
m_Emitter->setParticleSystem(m_ParticleSystem.get());
osg::ref_ptr<osgParticle::PointPlacer> mPlacer = new
osgParticle::PointPlacer();
mPlacer->setCenter(osg::Vec3(0.0,0.0,0.0));
m_Emitter->setPlacer(mPlacer.get());
m_Program = new osgParticle::ModularProgram;
m_Program->setParticleSystem(m_ParticleSystem.get());
Root->addChild(m_Program.get());
}
Then in the Update function for each frame I want to change the life time,
random rate counter and initial speed. The problem is that I can change the
random rate counter and initial speed but I can´t change the life time because
the particle disappear (whatever the value I set). Below you can find my code
snipet
Code:
void Update(float speed, float count, float life)
{
osg::ref_ptr<osgParticle::RadialShooter> pShooter =
(osgParticle::RadialShooter *)_pEmitter->getShooter();
pShooter->setInitialSpeedRange(speed*0.5,speed*0.9);
osg::ref_ptr<osgParticle::RandomRateCounter> pRate =
static_cast<osgParticle::RandomRateCounter *> (_pEmitter->getCounter());
pRate->setRateRange(count*1.0,count*1.5);
//osgParticle::Particle myParticle =
_pParticleSystem->getDefaultParticleTemplate(); //This don't work if there are
several particle systems
//if I remove the following instruction, the system works properly but
without the lifetime functionality.
m_myParticle->setLifeTime(life);
}
Thanks in advance for your help
cheers,
Iban
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=12605#12605
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