# Add selection to scene

Here you can follow few short steps to add selection to your scene.  You can choose from predefined selection areas or implemented your own.

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**Steps to set up:**

1. You can start by creating an empty Game Object and attach `UnitSelector` component to it or by dragging the <mark style="color:green;">**SelectionSystem**</mark> prefab into your scene, which is partially already configured for use. See **Main tab** and set up the following:

   * Once Selection is in the scene, set the camera to your player's camera (`Camera.main` will be used if it's not set)
   * Check out configuration options and adjust them for your project respectively
   * Set maximal selection number, if required.
   * Enable or disable quick access for units (saving and loading selection)

2. Next click on **Selection Area** tab and choose from one of the two provided selection area's or reference your custom one. For more details about them and their detection types see here [selection-area](https://travljen.gitbook.io/unit-selection/how-it-works/selection-area "mention").

   * **1st option: Selection Screen Rectangle** for 2D screen space selection area.
   * **2nd option: Selection World Cube** for 3D world space selection area.&#x20;

     Here you have to set the **Ground Layer Mask** because the world selection needs ground position to start somewhere.

3. Now you can set up player interactions with the input on **Input tab**. Here you have support for:
   * **None:** requires manual management of selection active states, either directly on `UnitSelector` or by implementing your own `AInputControl`
   * **Legacy Input**: uses built-in Unity input system
   * **New InputSystem**: utilises Unity latest and flexible input system (Package manager dependency)

4. Finally you can update any UI or notify your own components of selection events in the **Events tab**.

5. Save Scene.
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In case your camera is spawned later or loaded with a different scene, you can always use set it up later once you have the reference to it. Like this:

```csharp
// Set camera in code at any time
FindObjectOfType<UnitSelector>().SetCamera(Camera.main);
```

Ok, You are now **done** with scene set up.


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