WebGL Asset Bundles

Unity Engine
1

Normally for exporting WebPlayer asset bundles we would use:
the extension .unity3d, and
the BuildTarget.WebPlayer

string[] levels = new string[] {"Assets/Level1.unity"};
BuildPipeline.BuildStreamedSceneAssetBundle( levels, "Streamed-Level1.unity3d", BuildTarget.WebPlayer);

But For WebGL, is it?

string[] levels = new string[] {"Assets/Level1.unity"};
BuildPipeline.BuildStreamedSceneAssetBundle( levels, "Streamed-Level1.unity3d", BuildTarget.WebGLPlayer);

Does the file extension still remains .unity3d ?

2

The extension is not important for asset bundles. You can pick whichever you like or none at all.

3

Ok, so only setting the correct BuildTarget is important?
In my case, for WebGL: BuildTarget.WebGLPlayer

4

Correct.

5

Ok, so now, I am trying to load my scene. Here is the script I am using.

IEnumerator LoadSceneWebGL(string scene)
{
    download = new WWW ("./AssetBundles/"+scene+".unity3d");
    while(!download.isDone)
    {
       //here I update my preloader progress bar...
        yield return null;
    }
    yield return download;

    assetBundle = download.assetBundle;
   
    Application.LoadLevel(scene);

    yield return true;
}

Unfortunatly, it doesn’t work for me.
I get this error, in both Chrome and Firefox running on local server.

Chrome alert error:

Chrome console log:

Firefox alert error:

Firefox console log:

6

Also, when trying to log the asset bundle name, after the download is finished returns nothing.

//these two alert methods returns nothing.
Application.ExternalCall("alert",  download.assetBundle.name);
//and
Application.ExternalCall("alert", assetBundle.name);
7

Hello sluice,

you can get more details about the exception being thrown by enabling exceptions in your WebGL build.
To enable exceptions:

  • open Build Settings
  • select WebGL
  • click “Player Settings”
  • in the inspector, click “Publishing Settings”
  • set Enable Exceptions to a value different than none

Than recompile and run again.

Give it a try, it should give us more info to understand the problem.

8

For reference, here is what the UI looks like and what it should be set too. Make sure you make a development build.

1826718--117028--Screenshot 2014-10-28 10.05.20.png

9

@GabrieleUnity , @RalphH ,
I already have my exceptions set to SoftNullReferenceExceptions.

The complete errors is:

Then looking at that first error hint, in route1webgl.js:978:13,
the error is var err = new Error();

function jsStackTrace() {
  var err = new Error();
  if (!err.stack) {
    // IE10+ special cases: It does have callstack info, but it is only populated if an Error object is thrown,
    // so try that as a special-case.
    try {
      throw new Error(0);
    } catch(e) {
      err = e;
    }
    if (!err.stack) {
      return '(no stack trace available)';
    }
  }

Not really of much help…

10

that stack trace doesn’t seem to imply anything related to the assetbundle loading, as far as I can see. Rather, it is happening by an instantiate call in TilesCoinsIntegrator::InstantiateCoins. However, it does look like it is an issue with either a null reference or something going wrong in the instantiate.

11

With a different scene (without any TilesCoinsIntegrator stuff), It finally loads!
funny thing is the AssetBundle name returned is " ".

Now, I have to figure out why there is a problem with my other scene (most probably TilesCoinsIntegrator like you said.)
The weird thing is the scene doesn’t return any error when run alone as a build.
As with loading it as an asset, it works fine in WebPlayer, Flash and StandAlone.