Transform.GetSiblingIndex() not working in build?

Is Transform.GetSiblingIndex() meant to work in builds? In editor it seems to work fine, but when I do an OS/X build it always returns 0 for every transform. The documentation doesn't give any information.

I'm trying to search the scene for all objects with a specific component, and then sort the list so it is in the same order for all master/clients connected. Basically the list needs to be deterministic. So I thought I could assign each object an ID based on its index in the hierarchy and sort based on that, but it appears GetSiblingIndex() does not work in builds.

Am I missing something?

 

I should state that I am using Unity 5.3.3p3 and am loading scenes asynchronously. Perhaps that is why it doesn't work in builds?

 

I've since found this bug report for Unity: http://forum.unity3d.com/threads/bu...ne-root-game-objects-in-build-runtime.291137/

It sounds like this is a bug that is still not fixed. Objects in the root scene hierarchy all return a GetSibiingIndex of 0.

 

You can use own implementation:

Code (CSharp):

1. int GetSiblingIndex(Transform child, Transform parent)
2. {
3.         for (int i = 0; i < parent.childCount; ++i)
4.         {
5.             if (child == parent.GetChild(i))
6.                 return i;
7.         }
8.         Debug.LogWarning("Child doesn't belong to this parent.");
9.         return 0;
10. }

 

Quick question.

When do you call it? Awake? Start? OnEnable?

 

@Max-Bot And I should mention: nice necro

 

Doesn't matter where to call. From custom method.

For further generations.

 

2015-2019, still not fixed.

 

this bug is about root objects, they have no parent. this code won't work

 

The year is 2020, Unity 2019.3.10f1, the bug is still there...

 

Still there in 2021.1.16. I get correct values in editor, but on build all root gameobjects are at 0. Doesn't matter if I check it in awake/start/update.