/// <summary>
 /// 高亮显示拾取的图元。
 /// </summary>
 /// <param name="highlighter"></param>
 /// <param name="pickableRenderer"></param>
 public HighlightedPickableRenderer(HighlightRenderer highlighter,
     PickableRenderer pickableRenderer)
 {
     this.Highlighter = highlighter;
     this.PickableRenderer = pickableRenderer;
 }