设置texture

//获取内部资源贴图
    public void setInsideTexture()
    {
        Texture2D texture = Resources.Load(texture_url) as Texture2D;
        Renderer renderer = GetComponent<Renderer>();
        renderer.material.mainTexture = texture;
    }

    //获取外部资源贴图(本地路径)
    public void setExternalTextureByIO()
    {
        //创建文件读取流
        FileStream fileStream = new FileStream(texture_url, FileMode.Open,
            FileAccess.Read);
        fileStream.Seek(0, SeekOrigin.Begin);
        //创建文件长度缓冲区
        byte[] bytes = new byte[fileStream.Length];
        //读取文件
        fileStream.Read(bytes, 0, (int) fileStream.Length);
        //释放文件读取流
        fileStream.Close();
        fileStream.Dispose();
        fileStream = null;

        //创建Texture
        int width = 800;
        int height = 640;
        Texture2D texture = new Texture2D(width, height);
        texture.LoadImage(bytes);
        Renderer renderer = GetComponent<Renderer>();
        renderer.material.mainTexture = texture;

    }

    /// <summary>
    /// 以WWW方式进行加载
    /// </summary>
    private void setExternalTextureByWWW()
    {
        StartCoroutine(LoadWWW());
    }

    IEnumerator LoadWWW()
    {
        //请求WWW
        WWW www = new WWW(texture_url);
        yield return www;
        Renderer renderer = GetComponent<Renderer>();
        renderer.material.mainTexture = www.texture;
        Debug.Log(www.ToString());
        Stream outStream = File.Create(ExportClass.prePath + "test.png");
        byte[] buffer = www.bytes;
        outStream.Write(buffer, 0, buffer.Length);
        outStream.Close();

    }