Bug with loading scene from asset bundle

Unity Engine
,
1

Hi there :slight_smile:

I am experiencing a weird bug when loading a scene from an asset bundle -
for some bizarre reason, the GameObjects within the scene are reorganized.
Specifically - they are sorted alphabetically.

For example, I am building a simple mostly empty scene with the following hierarchy:

However, when loading that scene from the asset bundle, it looks like this:

The following is my asset bundle building logic:

[MenuItem("Assets/Build AssetBundles")]
    private static void BuildAllAssetBundles()
    {
        string bundleName = "emptyScene";
        string timestamp = DateTime.Now.ToShortTimeString().Replace(":","");
       
        string assetBundleDirectory = "Assets/StreamingAssets";
        if (!Directory.Exists(Application.streamingAssetsPath))
            Directory.CreateDirectory(assetBundleDirectory);

        AssetBundleBuild[] buildMap = new AssetBundleBuild[1];
        buildMap[0].assetBundleName = bundleName + "_" + timestamp;
        buildMap[0].assetNames = new string[1]
        {
            "Assets/Scenes/EmptyScene.unity"
        };
       
        BuildPipeline.BuildAssetBundles(assetBundleDirectory, buildMap, BuildAssetBundleOptions.None,
            EditorUserBuildSettings.activeBuildTarget);
    }

Has anyone experienced this bug before? Perhaps a clue as to what may be the cause of the issue?

Thanks in advance!

2

I don’t think the order of root objects is defined. It’s just sort of a big bag-o-data. Watching a running game it sorta seems random for the most part.

Everything that is parented under another GameObject should still be correctly ordered.

3

Hi Kurt-Dekker,

This isn’t a big deal if it comes to random GameObjects, however in the world of UI the order of children directly affects how the objects are rendered on top of each other.

4

Did you read what I wrote?

In my “world of UI” everything lives under a Canvas.

Therefore the items below it are parented.

Therefore its order is preserved.

Is that not the case?

5

Oh, you’re correct. My bad.
Not only is the parent-child relationship preserved, but all non-root GameObjects maintain their child index.

Thanks for the help!

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