人物头顶文字

using UnityEngine;
using System.Collections;

public class Text : MonoBehaviour {

    public Transform target;
    public Camera camera;
    public GUITexture guitexture ;    //偏移什么的所有的都设为0
    public GUIText guitext;      //偏移什么的所有的都设为0

    public GUIStyle center;

    Vector3 screenPos=new Vector3();
    public float x;
    public float y;
    public Vector3 forward;
    public Vector3 toOther;
    public bool infront;
    void Start () {

    }

    // Update is called once per frame
    void Update () {
        forward=camera.transform.TransformDirection(Vector3.forward);   //前方
        toOther=target.transform.position-camera.transform.position;    //相机到物体的向量
        if (Vector3.Dot(forward, toOther)>0)   //点乘
        {
            infront=true;
        }
        else
        {
            infront=false;
        }
        //~ print(camera.WorldToScreenPoint (target.position));
        screenPos = camera.WorldToScreenPoint (target.position+new Vector3(0F,0.1F,0f));
        x=screenPos.x;
        y=screenPos.y;
        guitext.pixelOffset =new Vector2 (x, y);
        guitext.material.color=Color.blue;

    }

    void OnGUI()
    {
        if (infront)
        {
            GUI.Label(new Rect (x, Screen.height-y, 200, 200),"renwuname",center);
            guitexture.pixelInset = new Rect (x, y, 100, 100);
        }
    }
}