Batch Export Scene Roots to glTF Files

A common Editor scripting use case is exporting GameObjects to individual .glb files.

The example below adds a Tools > glTFast Examples > Batch Export menu entry.

[MenuItem("Tools/glTFast Examples/Batch Export")]
static async Task BatchExportAllObjects()
{
    var currentScene = SceneManager.GetActiveScene();
    var rootObjects = currentScene.GetRootGameObjects();

    var exportSettings = new ExportSettings
    {
        Format = GltfFormat.Binary
    };

    var logger = new ConsoleLogger();
    try
    {
        for (var index = 0; index < rootObjects.Length; index++)
        {
            var rootObject = rootObjects[index];

            EditorUtility.DisplayProgressBar(
                "glTF Batch Export", rootObject.name, index / (float)rootObjects.Length);

            var export = new GameObjectExport(exportSettings, logger: logger);
            export.AddScene(new[] { rootObject }, rootObject.name);

            var success = await export.SaveToFileAndDispose(
                $"Assets/{rootObject.name}.glb",
                // Edit Mode does not pump the main-thread SynchronizationContext;
                // awaited I/O continuations could hang. Force the synchronous path.
                forceSync: true
                );
            if (!success)
            {
                Debug.LogError($"Exporting {rootObject.name} failed.");
            }
        }
    }
    finally
    {
        EditorUtility.ClearProgressBar();
        AssetDatabase.Refresh();
    }
}

A few details worth highlighting:

• forceSync: true is required because the menu item runs in Edit Mode — see Editor Scripting: Enforce Synchronous I/O for the rationale.

Trademarks

Unity® is a registered trademark of Unity Technologies.

Khronos® is a registered trademark and glTF™ is a trademark of The Khronos Group Inc.