@Override
    public EmptyParticleInfluencer clone() {
        try {
            return (EmptyParticleInfluencer) super.clone();
        } catch (CloneNotSupportedException e) {
            throw new AssertionError();
        }
    }
This influencer does not influence particle at all.
It makes particles not to move.
@author Marcin Roguski (Kaelthas)
jme3-core/src/main/java/com/jme3/effect/influencers/EmptyParticleInfluencer.java