How do I load an asset bundle?

Question

I am trying to load a bunch of prefabs from an asset bundle. I am building the asset bundles for StandaloneWindows64:

BuildPipeline.BuildAssetBundles(BuildPath, BuildAssetBundleOptions.None, BuildTarget.StandaloneWindows64);

I load my asset bundle using Unity's new web request system:

var www = UnityWebRequest.GetAssetBundle(Url); yield return www.Send(); if (www.isError) { Debug.LogError(www.error); yield break; } var bundle = ((DownloadHandlerAssetBundle)www.downloadHandler).assetBundle;

However, my bundle does not have my asset bundle in it. It only has the manifest:

//Output: "1 asset: bundlemanifest" Debug.Log(bundle.GetAllAssetNames().Length + " asset: " + bundle.GetAllAssetNames()[0]);

If I look at my manifest, I can see my asset bundle names "structures" does exist:

ManifestFileVersion: 0 CRC: 3317959940 AssetBundleManifest: AssetBundleInfos: Info_0: Name: structures Dependencies: {}

I tried retrieving it from my AssetBundleManifest:

var manifest = bundle.LoadAsset<AssetBundleManifest>("assetbundlemanifest");

But the AssetBundleManifest only has functions which return strings and Hash128s.

How can I instantiate the prefabs in my asset bundle named "structures"?

Can you clarify what you're doing with the results of BuildPipeline.BuildAssetBundles and where Url points (in your web request). BuildPipeline.BuildAssetBundles returns a manifest and then BuildPath is where the bundles are created. Note that each bundle also has a corresponding .manifest file that can be ignored in most cases; the actual bundle wont have an extension and that's the file you want to load. — Foggzie
– Foggzie, Commented Feb 22, 2017 at 20:26
I also noticed you tagged the question with "streaming-assets". If you're putting the bundles in Application.streamingAssetsPath, you don't need to deal with WWW, you can directly call AssetBundle.LoadFromFile. (WWW creates excessive amounts of garbage so only use it if you must) — Foggzie
– Foggzie, Commented Feb 22, 2017 at 20:29
@GuntherFox I am taking the asset bundles/manifests/etc and putting them on a local server. I am then using the URL of that local server. — Evorlor
– Evorlor ♦, Commented Feb 22, 2017 at 20:40
Does your URL include the underscore and the hash for the actual bundle file? When you build a bundle named "structures" it will create two files: one named structures.manifest and one named structures_XXXXXXXX where the X's are a hash. You want to make sure you're downloading the one with the underscore, hash, and no file extension. — Foggzie
– Foggzie, Commented Feb 22, 2017 at 21:09
@GuntherFox OK. I have no idea. This is where I am stuck? I cannot find access to my structures. The only reference I can find to it is the string name of it, which is not helpful. — Evorlor
– Evorlor ♦, Commented Feb 22, 2017 at 21:18

Evorlor · Accepted Answer · 2017-02-23 15:31:55Z

My URL required the name of the asset bundle at the end of it. I had the parent folder as my asset bundle's name, which loaded the Asset Bundle Manifest for some reason.

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