unity 播放过场动画

public var url="file:///c:/sample.ogg";   //文件路径
function Start ()
{
    //拼凑一个url
    url="file:///" + Application.dataPath + "/video/sample.ogg";
    print(url);  

    // 开始下载
    var www = new WWW(url);
    // 查看电影是否下载完，如果没有下载完，那么延时
    var movieTexture = www.movie;
    print("downloading...");
    while (!movieTexture.isReadyToPlay)
    {
        print(www.progress);
        yield;
    }
    print("download complete");
    print(www.url);     

    // 初始化gui保证在最中间
    guiTexture.texture = movieTexture;
    transform.localScale = Vector3 (0,0,0);
    transform.position = Vector3 (0.5,0.5,0);
    guiTexture.pixelInset.xMin = -movieTexture.width / 2;
    guiTexture.pixelInset.xMax = movieTexture.width / 2;
    guiTexture.pixelInset.yMin = -movieTexture.height / 2;
    guiTexture.pixelInset.yMax = movieTexture.height / 2;

    // 设置一张截图（切片）作为显示，在没有播放的时候
    audio.clip = movieTexture.audioClip;
    // Play both movie & sound
    movieTexture.Play();
    audio.Play();
}
// Make sure we have gui texture and audio source
@script RequireComponent (GUITexture)
@script RequireComponent (AudioSource)