# Advanced Preview Monitor

Advanced Preview Monitor (APM) is a powerful displaying interface that gives you the ability to **preview** your **Engine** scene in real-time right inside the Reality Hub user interface. 

APM displays the video on the pin you selected. 

To access it:

* Move your mouse pointer over the <mark style="color:green;">**`Output`**</mark> pin of the <mark style="color:yellow;">**`Composite Passes`**</mark> node and right-click.
* Go to **Monitor** and select **Channel - A**.

<div align="left"><figure><img src="https://content.gitbook.com/content/oKRkWKIoT5UAB0ERhlgD/blobs/SAdRYuLsg1UfJZvtKYkZ/image.png" alt=""><figcaption><p>Activating APM on <mark style="color:yellow;"><strong><code>Composite Passes</code></strong></mark> node's <mark style="color:green;"><strong><code>Output</code></strong></mark> pin</p></figcaption></figure></div>

<div align="left"><figure><img src="https://content.gitbook.com/content/oKRkWKIoT5UAB0ERhlgD/blobs/qj3ddXGwes1KOlDWPL9m/image.png" alt=""><figcaption><p>Active APM</p></figcaption></figure></div>

The screen symbol with letter on the <mark style="color:yellow;">**`Composite Passes`**</mark> node's <mark style="color:green;">**`Output`**</mark> pin indicates the which pin is currently monitored.

### Interface <a href="#advancedpreviewmonitor-interface" id="advancedpreviewmonitor-interface"></a>

<figure><img src="https://content.gitbook.com/content/oKRkWKIoT5UAB0ERhlgD/blobs/PKdLcOa4dfmTeegaXVAY/image.png" alt=""><figcaption><p>APM User Interface</p></figcaption></figure>

From left to right, APM buttons indicate the following features:

<div align="left"><img src="https://content.gitbook.com/content/oKRkWKIoT5UAB0ERhlgD/blobs/6NgoIRBw8CSG2dnFUoCv/image.png" alt="APM Menu"></div>

* **Safe Area**: Borders for action-safe area and title-safe area. It always shows a 16:9 widescreen aspect ratio.
* **RGB**: This feature allows you to display selected R, G, B, Y (Luminance) channels.
* **Zoom/Pan Reset**: When you select the Split View, this button gets activated and resets your pan/zoom view into its default state.
* **A|B**: Multiview allows you to check multiple outputs side by side.
* **A**: Channel A (Single view)
* **B**: Channel B (Single view)
* **A/B**: Split View allows you to check and compare multiple outputs in a unified window. With the help of a splitter, you can check and compare two videos from a 360-degree angle.
* **Pop-out**: This button allows you to popup APM as a new browser window. This function is helpful if you want to use APM in full-screen.

{% hint style="info" %}
Advanced Preview Monitor is **disabled** in the **Live Mode**. For more details, please visit the [Launcher Interface](https://zerodensitydocumentation.gitbook.io/docs/reality-5.4/reality-5.4/user-guide/launcher/launcher-interface).
{% endhint %}

{% hint style="info" %}
APM for **Unreal Engine** requires a different workflow. See [Advanced Preview Monitor for Unreal Engine](https://zerodensitydocumentation.gitbook.io/docs/reality-5.4/reality-5.4/user-guide/controlling-unreal-engine-vanilla-5.4.1/ustate/apm-for-unreal-engine-5.4)
{% endhint %}