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ScriptedImporter PrefabOrder

Seanba Seanba/ScriptedImporter_PrefabOrder 1

Demonstrates a bug in Unity's Scripted Importers where child object hierarchy order is not preserved when instantiating prefabs. Contains a reproducible test case showing how prefab children are reordered alphabetically instead of maintaining their original hierarchy order, which can cause rendering issues in UI-heavy scenes. Useful for understanding and reporting this importer limitation.

scripted-importerprefabbug-reporteditor-extensionhierarchyui-rendering

Unity Project

Built with Unity 2019.2.8f1 · download the source from GitHub

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ScriptedImporter PrefabOrder

README

ScriptedImporter_PrefabOrder

Prefab Order Bug with Unity Scripted Importers

This project contains a simple Scripted Importer (MyScriptedImporter.cs) with these two game objects:

  1. An empty main game object (this is the parent)
  2. An instantiated prefab object (this is the child)

The referenced prefab, TestPrefab, itself has 3 child objects with the following order:

  1. bbbBackPanel
  2. aaaFrontPanel
  3. _ThisShouldComeLast

We would like this order of child objects to be preserved when we instantiate the TestPrefab and attach it to the main object through our scripted importer. However, the child objects are ordered alphabetically.

  1. _ThisShouldComeLast
  2. aaaFrontPanel
  3. bbbBackPanel

Some Unity components, like UI elements, are rendered in the order they appear in the scene hierarchy so the re-ordered children can be the source of bugs.

To Reproduce

In order to reprodcue the bug you'll want to run the scripted importer and view the resulting asset in the scene.

  1. Reimport Assets/MyImportedObject. This uses the scripted importer that attaches a prefab instance.
  2. Drag Assets/MyImportedObject in the scene hierarchy
  3. Expand MyImportedObject in the scene hierarchy to see the TestPrefab children are out of order.

This depot is currently using Unity 2019.2.8f1. This behavior was first noticed with 2018.3.0f2.

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