[osg-users] Creating a flame of rocket

[Suraj Paul]

Hi Jannik,

Here's my code i am using the create the particle system and emitter. I am creating two particle systems--one for each exhaust of the rocket.:--
int main()
{
osg::ref_ptr<osg::MatrixTransform> mt = new osg::MatrixTransform;
osg::ref_ptr<osg::MatrixTransform> mt_2 = new osg::MatrixTransform;
osg::ref_ptr<osg::MatrixTransform> trans= new osg::MatrixTransform;

osg::ref_ptr<osg::Node> lan = osgDB::readNodeFile("cessna.osg");
trans->setMatrix( osg::Matrix::translate(0.0f, 0.0f, 0.0f) );
trans->addChild(lan); 


//create two particle systems at different locations 
mt->setMatrix( osg::Matrix::translate(5.0f, -5.0f, 0.0f) );
osgParticle::ParticleSystem* ps = createParticleSystem( mt.get());

mt_2->setMatrix( osg::Matrix::translate(-5.0f, -5.0f, 0.0f) );
osgParticle::ParticleSystem* ps_2 = createParticleSystem( mt_2.get());

//attach the two Particle system to 'trans' node
trans->addChild(mt.get());  trans->addChild(mt_2.get());  

//give motion to 'trans' using osg::AnimationPath::LOOP

trans->addUpdateCallback( createAnimationPathCallback(100.0f, 30.0) );

//add updater to each of the particle system
osg::ref_ptr<osgParticle::ParticleSystemUpdater> updater =    new osgParticle::ParticleSystemUpdater;
updater->addParticleSystem( ps );
updater->addParticleSystem( ps_2 );

//add the trans and updater to a group node called root

osg::ref_ptr<osg::Group> root = new osg::Group;
root->addChild( updater.get() );
root->addChild(trans.get());
osgViewer::Viewer viewer;
viewer.setSceneData( root.get() );
return viewer.run();

 }  /*******end of main********/

/************createparticleSystem func ***********************/

osgParticle::ParticleSystem* createParticleSystem( osg::Group* parent )
{
 osg::ref_ptr<osgParticle::ParticleSystem> ps =    new osgParticle::ParticleSystem;
 ps->getDefaultParticleTemplate().setShape(    osgParticle::Particle::QUAD); 
 ps->getDefaultParticleTemplate().setLifeTime( 0.50f ); 
 ps->getDefaultParticleTemplate().setSizeRange( osgParticle::rangef(0.5f, 0.1f) ); 
 ps->getDefaultParticleTemplate().setAlphaRange( osgParticle::rangef(0.5f, 0.0f) );
 ps->getDefaultParticleTemplate().setColorRange(osgParticle::rangev4(osg::Vec4(45.0/255.0f,179.0/255.0,217/255.0f,1.0f), osg::Vec4(172.0/255.0f,225.0/255.0f,240/255.0f,1.0f)) );
 ps->setDefaultAttributes("smoke.rgb", true, false );

 osg::ref_ptr<osgParticle::RandomRateCounter> rrc =  new osgParticle::RandomRateCounter;
 rrc->setRateRange( 100, 200 ); 
 osg::ref_ptr<osgParticle::ModularEmitter> emitter =    new osgParticle::ModularEmitter;
 emitter->setParticleSystem( ps.get() );
 emitter->setCounter( rrc.get() );
 osg::ref_ptr<osgParticle::RadialShooter> shooter = new osgParticle::RadialShooter;
 shooter->setThetaRange(osg::DegreesToRadians(-0.50), osg::DegreesToRadians(0.50) );

 shooter->setInitialSpeedRange( 1.5f, 1.0f );
 emitter->setShooter( shooter.get() );
 ps->setUseShaders(true);

 osg::ref_ptr<osgParticle::ModularProgram> program =   new osgParticle::ModularProgram;
 program->setParticleSystem( ps.get() );

osg::ref_ptr<osg::Geode> geode = new osg::Geode;
geode->addDrawable( ps.get() );
parent->addChild( emitter.get() );
parent->addChild( program.get() );
parent->addChild( geode.get() );
return ps.get();
}

... 

Thank you!

Cheers,
Suraj

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http://forum.openscenegraph.org/viewtopic.php?p=68760#68760