Particle gravity doesn't rotate with parent node

1000ml · December 4, 2017, 1:29pm

Ok, it’s not related to transformations. The culprit is this line here:

jMonkeyEngine/jmonkeyengine/blob/bed3cc8a170c59ffcde220fa59f36d25d604a603/jme3-core/src/main/java/com/jme3/effect/ParticleEmitter.java#L1087


// Spawns particles within the tpf timeslot with proper age
float interval = 1f / particlesPerSec;
float originalTpf = tpf;
tpf += timeDifference;
while (tpf > interval){
    tpf -= interval;
    Particle p = emitParticle(min, max);
    if (p != null){
        p.life -= tpf;
        if (lastPos != null && isInWorldSpace()) {
            p.position.interpolateLocal(lastPos, 1 - tpf / originalTpf);
        }
        if (p.life <= 0){
            freeParticle(lastUsed);
        }else{
            updateParticle(p, tpf, min, max);
        }
    }
}
timeDifference = tpf;

And it’s explained here: Interpolation of particle spawning point
Something like that should be implemented in an EmitterShape IMO.