> ## Documentation Index
> Fetch the complete documentation index at: https://docs.liv.tv/llms.txt
> Use this file to discover all available pages before exploring further.

# LckMonitor

> How to display the LIV Camera Kit (LCK) camera preview on an in-game surface using a RenderTexture in Unity VR apps.

## Description

`LckMonitor` is a Unity `MonoBehaviour` implementing `ILckMonitor` that acts as a display surface for LCK camera output. It auto-registers with the LCK system on enable, provides a `RenderTexture` output from connected `LckCamera` instances, and raises an event whenever a new texture is assigned — so you can pipe the capture preview onto any in-game screen, UI element, or 3D mesh.

***

## Usage

Use `LckMonitor` when you need to show the camera preview in your scene. Add it to a GameObject, then subscribe to `OnRenderTextureSet` to apply the texture wherever you need it.

```c# theme={null}
using Liv.Lck;
using UnityEngine;

public class MonitorExample : MonoBehaviour
{
    [SerializeField] private Renderer _screenRenderer;
    [SerializeField] private LckMonitor _lckMonitor;

    private void OnEnable()
    {
        _lckMonitor.OnRenderTextureSet += HandleRenderTextureSet;
    }

    private void OnDisable()
    {
        _lckMonitor.OnRenderTextureSet -= HandleRenderTextureSet;
    }

    private void HandleRenderTextureSet(RenderTexture rt)
    {
        // Apply the LCK render texture to a material on a screen mesh
        _screenRenderer.material.mainTexture = rt;
    }
}
```

***

## References

### Fields

| Field       | Type   | Description                                  |
| :---------- | :----- | :------------------------------------------- |
| \_monitorId | string | Unique identifier for this monitor instance. |

### Properties

| Property  | Type   | Description                             |
| :-------- | :----- | :-------------------------------------- |
| MonitorId | string | The unique identifier for this monitor. |

### Events

| Event              | Type                                                            | Description                                                         |
| :----------------- | :-------------------------------------------------------------- | :------------------------------------------------------------------ |
| OnRenderTextureSet | LckMonitorRenderTextureSetDelegate(RenderTexture renderTexture) | Invoked whenever a new `RenderTexture` is assigned to this monitor. |

### Methods

| Method                          | Returns | Description                                                          |
| :------------------------------ | :------ | :------------------------------------------------------------------- |
| SetRenderTexture(RenderTexture) | void    | Assigns a new `RenderTexture` to the monitor and triggers the event. |

***

## See Also

* [LckCamera](/api-reference/unity/classes/LckCameraController) — Camera component that outputs to monitors
* [LckMediator](/api-reference/unity/classes/LckMediator) — Static registry where monitors are auto-registered