@Override
    protected void applyVelocityVariation(Particle particle) {
        temp.set(FastMath.nextRandomFloat() * velocityVariation, FastMath.nextRandomFloat() * velocityVariation, FastMath.nextRandomFloat() * velocityVariation);
        particle.velocity.addLocal(temp);
    }
This method returns the surface tangent rotation factor.
@return the surface tangent rotation factor
jme3-core/src/main/java/com/jme3/effect/influencers/NewtonianParticleInfluencer.java