鼠标图片icon（选中物体变换图片）C#代码

using UnityEngine;
using System.Collections;

public class mouseicon : MonoBehaviour {

    public Texture mouse_ico;
    public Texture mouse_sweep;     //鼠标经过
    public Texture mouse_air;      //鼠标点空气

    void Start () {
        Screen.showCursor=false;
    }

    // Update is called once per frame
    void Update ()
    {
        mouse_ico=mouse_air;
        Ray ray = Camera.main.ScreenPointToRay (Input.mousePosition);
        RaycastHit hit;
        if (Physics.Raycast (ray,out hit, 100))
        {
            Debug.DrawLine (ray.origin, hit.point);
            if(hit.transform.tag=="enwu"
            {
                mouse_ico=mouse_sweep;
            }
            else
            {
                mouse_ico=mouse_air;
            }
        }
    }
    void OnGUI()
    {
        Vector3 mouse_pos= Input.mousePosition;
        GUI.DrawTexture(new Rect(mouse_pos.x,Screen.height-mouse_pos.y,16,20),mouse_ico);
    }
}