else this.center = new Vector3f(0,0,0);
    public void setData(Vector3f center, int zSamples, int radialSamples, float radius) {        if (center != null)            this.center = center;        this.zSamples = zSamples;        this.radialSamples = radialSamples;        this.radius = radius;        setGeometryData();        setIndexData();        setColorData();    }