# SceneLookupData

## General

{% hint style="warning" %}
When Creating [**SceneLoadData**](/docs/guides/features/scene-management/scene-data/sceneloaddata.md) or [**SceneUnloadData**](/docs/guides/features/scene-management/scene-data/sceneunloaddata.md) there are provided constructors that automatically create SceneLookupData for you. Most likely you will be using these constructors and will not be creating a separate SceneLookupData.
{% endhint %}

When you specify a scene by reference, or handle, the SceneManager will prefer to lookup that scene using the scene handle. This is important information when [**Scene Stacking**](/docs/guides/features/scene-management/scene-stacking.md). Looking up a scene by handle or object reference will place connections in the scene specified, but when using scene names, the server will create a new scene instance for the specified connections and place them into that scene. The described behavior only applies when loading scenes over multiple load calls; such as if you call LoadConnectionScene twice, each with its own connection.

## Default values

{% hint style="info" %}
A Scene Handle is an integer that Unity generates for a scene instance when it is loaded. You can use it to specify an instance of a scene that is already loaded, but not for loading a new instance of that scene. Read more about it here: <https://docs.unity3d.com/ScriptReference/SceneManagement.Scene-handle.html>
{% endhint %}

```csharp
// SceneLookupData default values
SceneLookupData slud = new SceneLookupData()
{ 
    // If Handle is greater than 0 then it will ignore Name and use Handle
    // to look up the scene.
    Handle = 0,
    // If Handle is set to 0, then Name is used to lookup the scene instead.
    Name = null 
}; 
```

See[ **Loading Scenes**](/docs/guides/features/scene-management/loading-scenes.md) and [**Unloading Scenes**](/docs/guides/features/scene-management/unloading-scenes.md) for implementation.


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