Hi Frank, Take a look to the osgparticleeffects example in the examples folder. In this code you can see how if you pick a moving model the particle system moves with it. You can see the result picking the cessna or the hanglide model in the example.
Hope this helps. 2010/7/15 Frank Sullivan <[email protected]> > Hello, > > I am hoping to create a particle effect that moves. However, I am having > difficulty with this. If I call ParticleEffect::setPosition, it seems to > have the effect of destroying the existing particle system and rebuilding it > from scratch: > > > Code: > > void ParticleEffect::setPosition(const osg::Vec3& position) > { > if (_position==position) return; > > _position = position; > > if (_automaticSetup) setUpEmitterAndProgram(); > } > > > > > The result of this seems to be that only 1 particle is emitted before the > Effect is reset, causing perhaps 2-3 particles to be emitted per second > rather than the 200 or so that I set as the rate. > > So, I tried to instead add this ParticleEffect as a child of a > MatrixTransform and, instead of moving the ParticleEffect with setPosition, > I move the MatrixTransform instead. This has an interesting effect. The > emitter itself seems to stay in the same exact spot. However, the particles > have a definite inertia to them. I tried moving the MatrixTransform in a > continuous circle on the x/y plane. The emitter didn't move, but the > particles seemed to fly outward from this position, as if they knew they > should be flying out at the circle's tangent, but weren't actually being > emitted from changing positions on the circle's perimeter. > > Lastly, I tried setting the useLocalParticleSystem value to false, not > knowing what it was, but thinking it was worth a try. The result seems to be > that no particles are emitted (or perhaps they are emitted somewhere where I > can't see them). > > Does anyone have any idea how I can achieve this, hopefully without > modifying OSG code? > > Thank you! > > Cheers, > Frank > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=30045#30045 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- Jordi Torres Fabra gvSIG 3D blog http://gvsig3d.blogspot.com Instituto de Automática e Informática Industrial http://www.ai2.upv.es
_______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
