Example use of the Unity 4.1 AirPlay API - gives a setup with the iOS device as controller of the remote display.

DualDisplay.cs

using UnityEngine;
using System.Collections;

/*
Runtime use:
To be available, AirPlay needs to be switched on for the device either via a native AirPlay UI component or
via the global AirPlay mirroring setting. Your options are:

A: Modify your Xcode project to layer a native AirPlay Cocoa control somewhere over your Unity content.

B: Enable global AirPlay mirroring on the device.
   - You will find this next to the global volume control - available when you slide the multi-task bar
     (accessible from double-home-button-click) to the right.
   - If AirPlay receivers are available on the network, you should see an AirPlay button next to the volume
     control.
   - Tapping it pops a target selector up and with a display capable target selected, toggle on "mirroring".
   - Returning to your application, AirPlay should now be available.

Though it is a more cumbersome user experience, I would recommend going with option B as long as it makes
sense, with an in-game description - to keep app simplicity.

If you want to test AirPlay, but do not have an AppleTV, I have successfully used AirServer for testing:
http://www.airserverapp.com
*/

namespace UnityAssets
{
	public class DualDisplay : MonoBehaviour
	{
		public Camera mainCamera, controlsCamera;
		public bool autoEnable = true;


		public bool Available
		{
			get
			{
				return enabled && Display.displays.Length > 1;
			}
		}


		public bool Active
		{
			get
			{
				return enabled && controlsCamera.enabled;
			}
			set
			{
				if (!value || !Available)
				{
					controlsCamera.enabled = false;

					controlsCamera.SetTargetBuffers (Display.main.colorBuffer, Display.main.depthBuffer);
					mainCamera.SetTargetBuffers (Display.main.colorBuffer, Display.main.depthBuffer);
				}
				else
				{
					Display secondDisplay = Display.displays[1];

					mainCamera.SetTargetBuffers (secondDisplay.colorBuffer, secondDisplay.depthBuffer);
					controlsCamera.SetTargetBuffers (Display.main.colorBuffer, Display.main.depthBuffer);

					controlsCamera.enabled = true;
				}
			}
		}


		void Reset ()
		{
			mainCamera = Camera.main;
		}


		void Start ()
		{
			if (mainCamera == null || controlsCamera == null)
			{
				Debug.LogError ("DualDisplay missing a camera reference");
				Destroy (this);
				return;
			}

			controlsCamera.enabled = false;
		}


		void Update()
		{
			if (Available)
			{
				if (autoEnable)
				{
					Active = true;
				}
			}
			else
			{
				Active = false;
			}
		}
	}
}

I am experiencing bad quality in dual display as well. Antialisasing seems to not be working on the second display. Tried on AirServer and AppleTV2. Was this something anyone else experiences?

Hi Guys I have tried it for a protrait game with AirServer Trial version and iPod 5th Gen, this script work perfect. but I notice main camera should behave like landscape game in AirServer (MAC). any guess about that...? I cant find any property about rstrict aspect of Main Cam which show on Air Server (second display or so on...)

I also have some confusiona about this line....
A: Modify your Xcode project to layer a native AirPlay Cocoa control somewhere over your Unity content.

Hallo,

i would like to send or mirror via HDMI but in full hd without black boarders on the sides. i want to display a vuforia AR app on a large tv.

Has anyone managed to get this working with Image Effects on the Airplay screen, they refuse to work for me on Unity 2018.2.7