unity3d三维场景开发中，为场景中物体对象添加标签，标签的可视性随着距离和遮挡情况改变。-unity3d three-dimensional scene developers to add labels for the objects in the scene object, the visibility of the label change with distance and occlusion.

OSG的节点上，每个节点添加一个Label标签。-On the OSG nodes, each add a Label tag.