Asset Bundles not supported?

Hi,

I'm getting:

The unity3d file is not a valid asset bundle.

When loading a bundle built with:

BuildPipeline.BuildStreamedSceneAssetBundle(new string[] { scenePath }, path, BuildTarget.PSM, out crc);

Are Scene asset bundles not supported or is there something I'm missing, it's the same code as on all other platforms.

Thanks,

Jon

 

Actually it's something that PSM is missing not you

 

Thanks guys!

 

Hi Erique,

Unfortunatly the attached only works in the editor, when I deploy to a device it comes up with the error:

[189.037467] HTTP status Code is 200
[189.037989] HTTP start transfer of 9592 bytes
[189.077889] HTTP end transfer
[189.131682] The unity3d file is not a valid asset bundle.
[189.132204] Bundle is null...
[189.212019] HTTP release context

All I changed was to upload the bundle to an online server and update the url as follows:

private string CreateURL(string name)
{
return "http://www.xxxxxxxx.com/"+name;//"file://" + Application.streamingAssetsPath + "/" + name;
}

it still works fine in the editor but on the device it fails.

Any thoughts?

Thanks,

Jon

 

If name has spaces in it then that will not work over a www connection without being encoded. Reason being that many servers will replace spaces with a + symbol instead as a space in a url breaks the url. if I were looking for a file called "max is great" and simply typed it into a browser, well let me type it here and you can see that the url is only valid up until the first space in the filename without using encoding i.e. www.fred.com/max is great

 

Sorry Peter, if you look at the error you'll see the file is downloading fine, it's an issue with the asset bundles compilation or runtime use not the WWW class or the request...that's clear from the error log.

 

Have you tried plugging your URL into a browser to see what is actually being returned?

 

Read the error, it's a 200 response confirming it's not the web request, and if you read the message you'll see it works in the editor, so I'm not sure what testing in a browser would achieve beside confirming exactly what the log already does. I've already properly debugged it, it is an issue with asset bundles on psm.

 

That doesn't answer the question. Have you tried your link in a browser?
A server returns a message based on how it's configured remotely. Just because your server is returning a 200 does not mean that it's returning a valid file. Simply plugging the url into a browser and checking if unity is able to read the returned file will tell you 100% if this is an issue with UnityPSM or your code. The error messages you've shown are just debug. For instance if you were to send a registration message to a push service like Pushwoosh it would return a 1000 code (registration succesful) even if there is an error as the error information is contained in a separate custom field. That's just the way that particular server works.
So while you seem to think I'm ignoring your debug I am simply asking you if you've ACTUALLY checked what is happening when you send YOUR request to the server and a browser, which is independent of unity or your code, will verify exactly what is happening. Until then you haven't actually tested your file downloads properly at all.

 

Bundle made in an up to date / same version Unity?

 

I said you didn't read my message properly:

"the attached only works in the editor"

The url and downloaded to the editor works fine, what would downloading it separately and then putting into the editor test that running the code in the editor does not? The issue is asset bundles, as stated at the top of the thread the same code that works on all other platforms is used, it's tested properly you've just not read the thread properly. Don't get me wrong I appreciate your responses and that you have taken the time to make a suggestion, but it is not the download link, it's the asset bundle.

Having tested further, it looks like unity is ignoring the compile to PSM and is compiling it to Stand Alone instead, which would follow as the bundle works in the Editor, yet no other platforms (iOS, BlackBerry and Android, etc) bundles work in the editor.

 

Yes, it works fine in the editor and every other platform, the same compiled bundle works in the Editor, Web Player and Stand Alone.

 

On further investigation it's the WWW class that's the issue. Not sure what it's doing, but if you load the bundles from StreamingAssets it's fine, but downloading with WWW on PSM fails from a Url, the Editor works fine. I'll submit a bug report.

 

For anyone wanting to do this:

private string CreateURL(string name)
{
return "http://www.yoururl.com/"+name;
}
private string CreatePath(string name)
{
return "file://" + Application.persistentDataPath + "/" + name;
}
private string IOPath(string name)
{
return "file://" + Application.persistentDataPath + "/" + name;
}
private IEnumerator DownloadAssetBundle(string name)
{
var path=CreatePath(name);
if (!System.IO.File.Exists(path))
{
WWW dl = new WWW(CreateURL(name));
Debug.Log(CreateURL(name));
yield return dl;
if (dl.error != null)
{
Debug.Log("ERROR: " + dl.error);
yield return 0;
}
System.IO.File.WriteAllBytes(IOPath(name), dl.bytes);
}
WWW www = new WWW(path);
yield return www;
if (www.error != null)
{
Debug.Log("ERROR: " + www.error);
yield return 0;
}
AssetBundle ab = www.assetBundle;
if(ab!=null)
{
Object obj = (Object) ab.mainAsset;
GameObject pGO = (GameObject) obj;
if (pGO == null)
Application.LoadLevelAdditive(System.IO.Path.GetFileNameWithoutExtension(name));
else
Instantiate(pGO,new Vector3(.0f,.0f,.0f),pGO.transform.rotation);
}
else
{
Debug.Log ("Bundle is null...");
}
}

Is the workaround I'm using that works, it seems to still be an issue with the .LoadFromCacheOrDownload command.

 

Building streamed scenes works fine for me did you actually set the scenes up to be loaded via WWW? as in

BuildOptions.BuildAdditionalStreamedScenes

 

No, because it only needs the single scene in the bundle, plus this would not return the error above.

 

I'm not sure I understand your logic. The build option above is needed if you are creating an asset bundle of a scene, be that a single scene or multiple scenes. Are you saying you omited the build options because you were only building a single scene into the asset bundle and the options name is plural BuildAdditionalStreamedScenes

Edit: Hopefully EriQue can explain asset bundle creation to you better.

 

I don't need an explanation, firstly, aside from the first post where it was code I had written for a game for Audi, currently out on iOS, Android, BB10 and Windows Phone which uses the same code yet works perfectly doesn't work on PSM. All the posts following are using EriQue sample code, which incidentally is the same as mine.

You should generally not use the method you are suggesting as it is not the recommended way to build a streamed scene, from the documents: "The best way to build a streamed scene asset bundle is to use BuildPipeline.BuildStreamedSceneAssetBundle" which is the technique both me and EriQue used.

 

Thanks eriQue, no need to apologise.