Which Assets are included in an Asset bundle? – Unity

Symptoms

You found that some Asset bundles are larger than expected.
You need to know what is packed into the Asset bundle.

Cause

If you have an Asset marked as none in the Inspector bundle name but other Assets have a dependency on it, it will be included in the bundle.

This will cause repeated Assets in AssetBundles.

Resolution

The simple way to inspect an Asset bundle is to create a public Asset bundle variable. Load the Asset bundle and double-click the Asset bundle object in the Inspector to open the Inspector with the content of the Asset bundle.

You now have a list of the elements that include the Asset bundle and a list of their dependencies.

Example:

using UnityEngine; 
using System.IO;

public class LoadAssets : MonoBehaviour { 
   public AssetBundle assetBundle; 
   public string name; 
   void Start() {
 
     //Get the asset from Streaming Assets path 
     var myLoadedAssetBundle = AssetBundle.LoadFromFile(Path.Combine(Application.streamingAssetsPath, name)); 

     if (myLoadedAssetBundle == null) { 
        Debug.Log("Failed to load AssetBundle!"); 
        return; 
     } 
     //set the public Asset bundle variable 
     assetBundle = myLoadedAssetBundle; 
   } 
}

Screen_Shot_2021-08-02_at_2.16.06_PM.png

Screen_Shot_2021-08-02_at_2.16.22_PM.png

Double-click on the cube bar in the Inspector window to view the bundle's properties.

Another alternative is to use an Editor script to load the Asset bundle as a SerializedObject and iterate for all the elements of the object.

[MenuItem("SUPPORT/Bundles/Print Contents")]
    static void PrintContents()
    {
        if( Selection.activeObject == null )
            return;

        AssetBundle bundle = AssetBundle.LoadFromFile( Application.dataPath + AssetDatabase.GetAssetPath( Selection.activeObject ).Remove(0,6) );

        if( bundle != null )
        {
            SerializedObject so = new SerializedObject( bundle );
            System.Text.StringBuilder str = new System.Text.StringBuilder();

            str.Append( "Preload table:\n" );
            foreach( SerializedProperty d in so.FindProperty( "m_PreloadTable" ) )
            {
                if( d.objectReferenceValue != null )
                    str.Append( "\t<color=green>" + d.objectReferenceValue.name + " " + d.objectReferenceValue.GetType().ToString() + "\n" );
            }

            str.Append( "Container:\n" );
            foreach( SerializedProperty d in so.FindProperty( "m_Container" ) )
                str.Append( "\t" + d.displayName + "\n" );

            Debug.Log( str.ToString() );
            bundle.Unload( false );
        }

Additionally, you can check the Editor log after you build the Asset bundles.

More Information

For more information, consult the following:

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