@Override
    public void setInitialVelocity(Vector3f initialVelocity) {
        this.initialVelocity.set(initialVelocity);
    }
Called internally by com.jme3.util.clone.Cloner.  Do not call directly.
jme3-core/src/main/java/com/jme3/effect/influencers/DefaultParticleInfluencer.java