Unity用GUI在角色头上显示名字（C#脚本）

 using UnityEngine;

    
 using System.Collections;
    
  
    
 public class wenzi : MonoBehaviour {
    
 	
    
 	//主摄像机对象
    
 	private Camera camera;
    
 	//NPC名称
    
 	public string name;
    
 	
    
 	//主角对象
    
 	GameObject hero;
    
 	//NPC模型高度
    
 	float npcHeight;
    
  
    
 	//默认NPC血值
    
 	private int HP = 100;
    
 	
    
 	void Start ()
    
 	{
    
 		//得到主角对象
    
 		hero = this.gameObject;
    
 		//得到摄像机对象
    
 		camera = Camera.main;
    
  
    
 		//得到模型原始高度
    
 		float size_y = collider.bounds.size.y;
    
 		//得到模型缩放比例
    
 		float scal_y = transform.localScale.y;
    
 		//它们的乘积就是高度
    
 		npcHeight = (size_y *scal_y) ;
    
 		
    
 	}
    
 	
    
 	void OnGUI()
    
 	{
    
 		//得到NPC头顶在3D世界中的坐标
    
 		//默认NPC坐标点在脚底下，所以这里加上npcHeight它模型的高度即可
    
 		Vector3 worldPosition = new Vector3 (transform.position.x , transform.position.y + npcHeight,transform.position.z);
    
 		//根据NPC头顶的3D坐标换算成它在2D屏幕中的坐标
    
 		Vector2 position = camera.WorldToScreenPoint(worldPosition);
    
 		//得到真实NPC头顶的2D坐标
    
 		position = new Vector2 (position.x, Screen.height - position.y);
    
  
    
 		//计算NPC名称的宽高
    
 		Vector2 nameSize = GUI.skin.label.CalcSize (new GUIContent(this.name));
    
 		//根据tag设置显示颜色
    
 		if (this.tag == "green")
    
 				GUI.color = Color.green;
    
 		else if(this.tag == "red")
    
 				GUI.color = Color.red;
    
 		GUI.skin.label.fontSize = 18;//字体大小
    
 		//绘制NPC名称
    
 		GUI.Label(new Rect(position.x - (nameSize.x/2),position.y - nameSize.y ,nameSize.x,nameSize.y), name);
    
  
    
  
    
  
    
 	}
    
 }