Hi Bill, I think what you want is to put the ModularEmitter under a Transform. A Geode with the ParticleSystem will be a sister to the Transform. Make sure the ModularEmitter has a reference to the same ParticleSystem in the Geode. The ParticleSystemUpdater will also need a reference to the ParticleSystem. You can control the direction (and position) of the particles with the Transform. I usually use a MatrixTransform.
---- Tom Jolley ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Poirier, Guillaume Sent: Tuesday, October 06, 2009 1:25 PM To: OpenSceneGraph Users Subject: Re: [osg-users] MatrixTransform and particle system Hi Tom, Thanks for helping out. I am indeed using a ModularEmitter and ParticleSystemUpdater. I was doing something like: effect->addChild(emitter); effect->addChild(program); effect->addChild(updater); geode->addChild(particleSystem); transform->addChild(geode); effect->addChild(transform); root->addChild(effect); I was expecting that if with no transform the particles are emitted towards +Z say, then I could add a rotation transform to emit them towards the +X axis for example. Not sure what was the problem with adding a MatrixTransform. The behavior was add one geode, the particles go towards +Z. Add a parent rotation to move towards +X, the particles still emit towards +Z. Now add another geode with particle system before previous one (no transform), and particles are emitted both towards +Z and +X (see first post)... What I did to solve my problem is that I computed the theta and phi angles of the desired rotation and set the emitter to those values using setThetaRange() and setPhiRange(). This works as intended. Either there is something I was doing wrong / not understanding before, or maybe there is a bug somewhere in osgParticle... cheers ! bill ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Jolley, Thomas P Sent: October-06-09 11:55 AM To: OpenSceneGraph Users Subject: Re: [osg-users] MatrixTransform and particle system Hi Bill, Do you have a ModularEmitter and ParticleSystemUpdater? If so, where are they in the scene graph? Are you expecting the particles, after being emitted, to move with the transform or stay in the world coordinate system. ---- Tom Jolley ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Poirier, Guillaume Sent: Monday, October 05, 2009 12:09 PM To: OpenSceneGraph Users Subject: Re: [osg-users] MatrixTransform and particle system Yes sorry I should have mentioned that... I am using 2.8.2. cheers ! bill ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Jolley, Thomas P Sent: October-05-09 12:42 PM To: OpenSceneGraph Users Subject: Re: [osg-users] MatrixTransform and particle system Hi Bill, What version of osg are you using? ---- Tom Jolley ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Poirier, Guillaume Sent: Monday, October 05, 2009 11:18 AM To: OpenSceneGraph Users Subject: [osg-users] MatrixTransform and particle system I am trying to apply a transform to a particle system like this: _transform = new osg::MatrixTransform; _transform->setMatrix(osg::Matrix::rotate(fromDir, toDir)); _geode = new osg::Geode; _geode->addDrawable(particleSystem.get()); _transform->addChild(_geode.get()); addChild(_transform.get()); Unfortunately adding the transform does not transform my particles... However if I add another geode like this before the previous code: osg::ref_ptr<osg::Geode> pDummy = new osg::Geode; pDummy->addDrawable(particleSystem.get()); addChild(pDummy.get()); Then I have one set of transformed particles and one set of untransformed ones. Probably I am missing something simple here ? Anyone has a suggestion ? cheers ! bill
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