Scripted Importers: Identifier uniqueness violation

Hello, I'm using the scripted importers pipeline to import a custom 3d format.
The files contain the 3d model as well as the bone armature.
It wen't pretty well so far but I've reached a warning that I don't know what to do about.



This happens when I create the bone hierarchy and I parent them. It seems that if a bone has more than 1 child, this warning is thrown.
I'm not using ctx.AddObjectToAsset() for each bone transform. I'm just parenting them to their parent and to the main asset. If I also use ctx.AddObjectToAsset() on each bone transform, the bones are duplicated and I get a bunch of other errors. I believe ctx.AddObjectToAsset() would solve the problem if the duplication would not happen. My guess is that an import name is not assigned to the bones that I parent and are given the default name of Transform and that's why there are multiple identifiers like name/name/transform.

Anyone knows how I can fix these warnings?

 

So I tried to find the simplest code that reproduces this problem.

Code (CSharp):

1. public override void OnImportAsset(AssetImportContext ctx)
2. {
3.     GameObject test = GameObject.CreatePrimitive(PrimitiveType.Cube);
4.     test.name = "root";
5.  
6.     GameObject child = GameObject.CreatePrimitive(PrimitiveType.Cube);
7.     child.name = "child1";
8.  
9.     GameObject child2 = GameObject.CreatePrimitive(PrimitiveType.Cube);
10.     child2.name = "child2";
11.  
12.     child.transform.SetParent(test.transform);
13.     child2.transform.SetParent(test.transform);
14.  
15.     ctx.AddObjectToAsset("rootasset", test);
16.     ctx.SetMainObject(test);
17. }

I also tried to make a prefab from the hierarchy and then add it. Same problem

 

I'm not sure if it's related, but the first time I import a custom asset through the script I also get an error:

If I right click -> reimport after that, I only get the warnings.

 

Hey guys,
Thanks for investigating.
@markvi since jason found it's fixed in 2018.1, i'm guessing i should not submit a bug anymore

 

This is happening for me in Unity 2019.1.13f1

 

Also getting 'Identifier uniqueness violation...' in 2019.2.2f1

 

Same here. It seems identifier uniqueness warning occurs for example when a mesh added after a transform has the same name as that transform.

 

Same problem here with a substance on Unity 2018.4.01f

 

The same happening with my importer, its very annoying, any word from Unity on this?

 

Have any of you filed bug reports? If not can you please do that and post back with the case ID here, as thats the proper way to handle a bug. Mentioning it on the forums without a bug report gets you nowhere.

 

Guess this won't be fixed anytime soon (or ever): https://issuetracker.unity3d.com/is...ur-to-model-prefab-root-via-assetpostprocesso

 

this message also appears when running a scripted importer on unity 2018.4.11f1

we suspect this causes sever issues with version control of our project - on some machines the project loads with tons of missing prefabs

 

Getting same problem in 2020.1.13. Doesn't say which objects are affected so difficult to debug

Identifier uniqueness violation: 'Name:Missing Prefab (Dummy), Type:GameObject'. Multiple Objects with the same name/type are generated by this Importer. There is no guarantee that subsequent imports of this asset will properly re-link to these targets.

 

Getting same problem in 2021.1....is there a solution in sight?

 

Getting that issue in 2020.3.26f1!

 

Hi! The same here. I've got missed references after migrading from 2020 to 2021. But the error disappears when I open the project back in 2020.

Identifier uniqueness violation: 'Name:HeadDead, Type:Sprite'. Multiple Objects with the same name/type are generated by this Importer. There is no guarantee that subsequent imports of this asset will properly re-link to these targets.

 

The same issue still occur in Unity version 2021.3.3
Identifier uniqueness violation: 'Name:, Type:Sprite, FileId:2877471580529523173'. Multiple Objects with the same FileId are generated by this Importer. There is no guarantee that subsequent imports of this asset will properly re-link to these targets.

 

Hi, I'm working on a custom importer and getting this issue as well.
Is there a way to prevent it (i.e. by naming components adequately)?

I already made material names more unique by prefixing them with a specific name, but is there anything I can do regarding regular MonoBehaviour-based components?

 

I'm seeing the same problem with build 2021.3.25f1