用C#下载图片

using UnityEngine;
using System.Collections;

public class NewBehaviourScript : MonoBehaviour {
    public GameObject obj;
    // Use this for initialization
    WWW www;
    void Start () {
        StartCoroutine(ABC("http://images.earthcam.com/ec_metros/ourcams/fridays.jpg"));
    }

    // Update is called once per frame
    void Update ()
    {
        if(www.isDone)
        {
            renderer.material.mainTexture = www.texture;
            www=null;
        }
        else
        {
            print(www);
        }
    }

    public IEnumerator ABC(string URL)
    {
        www = new WWW (URL);
        yield return www;
    }
}