tip.getBatch(0).getLocalTranslation().set(0, length*.75f, 0);
tip.getBatch(0).translatePoints(0, length*.75f, 0);
    protected void buildArrow() {        clearBatches();                // Start with cylinders:        Cylinder base = new Cylinder("base", 4, 16, width*.75f, length);        rotator.fromAngles(90*FastMath.DEG_TO_RAD, 0, 0);        base.getBatch(0).getLocalRotation().set(rotator);        addBatch(base.getBatch(0));        Pyramid tip = new Pyramid("tip",  2*width, length/2f);        tip.getBatch(0).getLocalTranslation().set(0, length*.75f, 0);        addBatch(tip.getBatch(0));    }