_onHitTest(x, y) {
    const hits = this._nativeHitTest.call(this.vrDisplay, x, y);

    const t = (parseInt(performance.now(), 10) / 1000).toFixed(1);
    const didHit = hits && hits.length;
    const value = `${didHit ? this._hitToString(hits[0]) : 'MISS'} @ ${t}s`;

    this.update(value, didHit, didHit !== this._didPreviouslyHit);
    this._didPreviouslyHit = didHit;
    return hits;
  }
@param {number} x
@param {number} y
@return {VRHit?}