> For the complete documentation index, see [llms.txt](https://travljen.gitbook.io/unit-system/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://travljen.gitbook.io/unit-system/integration/unit-selection.md).
# Unit Selection
Guide on how to integrate Unit Selection with Unit System entities.
### Overview
This page is for guiding you through the process of basic integration for [**Selection System**](https://assetstore.unity.com/packages/tools/input-management/rts-unit-selection-v2-0-284090) package. Refer to the [**Selection Guide**](https://travljen.gitbook.io/unit-selection) if you need more information.
### 1. Selection & Units
For scene unit selection to work, you only need these two things:
* **Selection System** prefab in **scene** and configure it (and it's visuals)
* `SelectableUnit` and additionally `ManagedUnitObject` components to your **units**.
Now this will already work for selecting and highlighting units by the player. However since this is a separate package, we need to connect selection and interaction for the player.
Selection components on Unit
### 2. Sync Player Selection
If you are manually managing interactions and UI for selected units, you can **skip this step**.
However if you are using provided **Player UI** prefab, then `EntitySelectionManager` is used to communicate selection changes to those scripts. For this we have provided 2 basic scripts that simplify the integration process.
Find and add **Player Selection (Unit Selection)** prefab to your scene. This includes:
* `PlayerUnitSelectionManager` script which replaces `EntitySelectionManager`. This manages the communication between the `EntitySelectionManager` interface and `UnitSelector` to make sure the **data is synced**.
* Additionally we have 2 scripts for filtering selection, both may be removed if undesired:
* `MultiSelectionFilter` script for basic **Strategy filtering behaviour**, this restricts multi selection to only owned units of the player; when dragging to select multiple units, only owned ones are selected. Does not impact single selection behaviour.
* `UnitStructureSelectionFilter` script, similar to the previous one it filters out units with buildable capabilities on multi-selection, but only when non-building is present. This means that drag to select can select buildings, as long as there is no other unit present in selection. Otherwise those units will be prioritised.
