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)