setData(null, xExtent, yExtent, zExtent);
setData(center, xExtent, yExtent, zExtent);
    public void recomputeMesh() {        if (!center.equals(oldCenter) || xExtent != oldXExtent || yExtent != oldYExtent || zExtent != oldZExtent) {            setData(null, xExtent, yExtent, zExtent);            oldXExtent = xExtent;            oldYExtent = yExtent;            oldZExtent = zExtent;            oldCenter.set(center.x, center.y, center.z);        }    }