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
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