DIfference between GetCorrespondingObjectFromOriginalSource and GetCorrespondingObjectFromSource

Hello,
I am trying to find a method, with which I could find out, if a Game object is / is created from a prefab. If the GameObject has a parent, I am not intressted, if the parent is a prefab, but the Child itself. I tried probably every possible method from here: https://docs.unity3d.com/ScriptReference/PrefabUtility.html, but unfortunatly nothing works. So I wanted to know, how exactly the methods are described. I got a look on the two most probable ones: GetCorrespondingObjectFromOriginalSource and GetCorrespondingObjectFromSource and found out, that they have the same definition:

Code (CSharp):

1. public static TObject GetCorrespondingObjectFromOriginalSource<TObject>  (TObject componentOrGameObject) where TObject : UnityEngine.Object;
2.  
3. public static TObject GetCorrespondingObjectFromSource<TObject>   (TObject componentOrGameObject) where TObject : UnityEngine.Object;

This leads me to the question, why the two exist if they are the same...

Does anybody know that?

Thank you very much
Huxi

 

They are not the same. Here's the docs for the two methods:
https://docs.unity3d.com/ScriptReference/PrefabUtility.GetCorrespondingObjectFromSource.html
https://docs.unity3d.com/ScriptReference/PrefabUtility.GetCorrespondingObjectFromOriginalSource.html

Due to nested Prefabs and Prefab Variants, there can be a chain of corresponding objects. GetCorrespondingObjectFromSource goes one step along this chain. GetCorrespondingObjectFromOriginalSource goes all the way to the last one.

 

Hello @runevision
I have read the documentation, but I still don't understand the exact meaning. But still, it looks, that these two are not what I am looking for. Is there a method, with which help I can find out, whether a children has/is a prefab? I guess I tried already every method from the PrefabUtilities, but it seams, that every method searches after a prefab just in the parent, but not for the child itself.

 

Perhaps this session can help get a deeper understanding:

I'm not completely sure what you mean.

You can always get a parent by getting transform.parent and then (if it's not null) perform checks on that. This way you could check if the parent is a Prefab instance using
https://docs.unity3d.com/ScriptReference/PrefabUtility.IsPartOfPrefabInstance.html
This will return true if the parent is part of a Prefab instance and false if it isn't.

If you want to check if a given GameObject is the root of a Prefab instance, then you can use of of these:
https://docs.unity3d.com/ScriptReference/PrefabUtility.IsAnyPrefabInstanceRoot.html
https://docs.unity3d.com/ScriptReference/PrefabUtility.IsOutermostPrefabInstanceRoot.html

This will return true for objects that are the root of a Prefab instance, but not for the children inside the Prefab instance - except if a child is the root of a different Prefab instance. IsOutermostPrefabInstanceRoot will not return true for nested Prefabs while IsAnyPrefabInstanceRoot will.

 

I try it with an example. You have this GameObject:

Door
- Frame
- Wing

and you want to know if the "Frame" itself is a prefab (or was created from a prefab). So, I am not interested to know, if the Door as parent is a prefab, but The frame itself.
Unfortunately, all methods I tried are checking just this; They go to the Frame and then the hierarchy up, to see if it's parent is an prefab. But well, that's not what I want.

 

Prefabs can contain multiple GameObjects, but always only one root GameObject. When you say you want to check if Frame itself is a Prefab, not the parent, it sounds like you want to know if Frame is the root of a Prefab. You can do this with
https://docs.unity3d.com/ScriptReference/PrefabUtility.IsAnyPrefabInstanceRoot.html

If that doesn't do what you need, can you go into more details about how it gives different results than you expect?

 

Hi, it actually works .
I didn't consider this because the name was not convincing me that it would do what I needed.

Thank you very much
Huxi