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By Design

Votes

0

Found in

5.6.0b11

Issue ID

896474

Regression

No

SceneManager.GetSceneByBuildIndex().name returns an empty string if scene is not loaded

Scene Management

-

Reproduction steps:
1. Open the attached project and run any scene
2. See, that .GetSceneByBuildIndex().name returns valid name only for the scene which is loaded
3. You can click "Load next scene" to verify, that it happens on every scene

This bug makes it difficult to retreive all the scene names during runtime

  1. Resolution Note:

    This is by design because the SceneManager only manages scenes that have been loaded so if it hasn't been loaded yet you cannot query any information from the returned Scene struct. Try checking the scene.IsValid() method before querying any info.

    SOLUTION:
    You should use SceneUtility.GetScenePathByBuildIndex() instead.

    Note you can have scenes named the same at different paths so the path is better to use in general.

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Comments (14)

  1. kloot

    Jun 29, 2021 14:30

    If this is by design... How intuitive would you say that design is? :)

  2. Mads-Nyholm

    Nov 16, 2020 08:47

    This is by design because the SceneManager manages scenes that have been loaded so if it hasn't been loaded yet you cannot query any information from the returned Scene struct. Try checking the scene.IsValid() method before querying any info.

    SOLUTION:
    You should use SceneUtility.GetScenePathByBuildIndex() instead as this will work regardless of the scene being loaded or not. If you only need the name you can get that from the path.

  3. TheProcessor

    Jul 14, 2020 20:30

    Please fix it!

  4. zhuchun

    Jun 12, 2020 08:00

    When Unity insisted that it's by design, it's a design flaw

  5. deeprest

    Apr 01, 2020 09:58

    2019.3.6f1 still has this error. THIS SHOULD NOT BE BY DESIGN.

    SceneManager.GetSceneByBuildIndex() should take a build index and return a Scene struct.

    I think most folks try to get the scene struct this way IN ORDER TO THEN LOAD THE SCENE.

    If it only returns LOADED scenes BY DESIGN, call the function GetLoadedSceneByBuildIndex(),
    and then provide us with a function that returns a valid scene struct from a scene in the build menu.

  6. lassfar

    Mar 26, 2020 12:26

    Unity version 2019.1.3f1
    The error :
    "NullReferenceException: Object reference not set to an instance of an object
    LevelManager.NextLevelLoader () (at Assets/Scripts/LevelManager.cs:94) //My Script
    UnityEngine.Events.InvokableCall.Invoke () (at C:/buildslave/unity/build/Runtime/Export/UnityEvent/UnityEvent.cs:166)
    UnityEngine.Events.UnityEvent.Invoke () (at C:/buildslave/unity/build/Runtime/Export/UnityEvent/UnityEvent/UnityEvent_0.cs:58)
    UnityEngine.UI.Button.Press () (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Button.cs:66)
    UnityEngine.UI.Button.OnPointerClick (UnityEngine.EventSystems.PointerEventData eventData) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/UI/Core/Button.cs:108)
    UnityEngine.EventSystems.ExecuteEvents.Execute (UnityEngine.EventSystems.IPointerClickHandler handler, UnityEngine.EventSystems.BaseEventData eventData) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/ExecuteEvents.cs:50)
    UnityEngine.EventSystems.ExecuteEvents.Execute[T] (UnityEngine.GameObject target, UnityEngine.EventSystems.BaseEventData eventData, UnityEngine.EventSystems.ExecuteEvents+EventFunction`1[T1] functor) (at C:/buildslave/unity/build/Extensions/guisystem/UnityEngine.UI/EventSystem/ExecuteEvents.cs:261)
    UnityEngine.EventSystems.EventSystem:Update()".

    My respectful greetings to Unity Technologies Team for its efforts

  7. ghostravenstorm

    Mar 01, 2020 01:22

    2019.3.2f1 still has this problem.

  8. unity_YkF-_UDlrzm5Nw

    Sep 26, 2018 10:32

    2018.4.11f1 Still has this error.

  9. Estellise-Yukihime

    Aug 18, 2018 14:35

    2017.4.1f1 also have this error.

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