@Override
    public DefaultParticleInfluencer clone() {
        // Set up the cloner for the type of cloning we want to do.
        Cloner cloner = new Cloner();
        DefaultParticleInfluencer clone = cloner.clone(this);
        return clone;
    }
This method applies the variation to the particle with already set velocity.
@param particle
       the particle to be affected
jme3-core/src/main/java/com/jme3/effect/influencers/DefaultParticleInfluencer.java