[Unity] Fixed aspect ratio camera

CameraFixedAspectRatio.cs

using UnityEngine;
using System.Collections;

public class CameraFixedAspectRatio : MonoBehaviour
{
	#region inspector properties
	[SerializeField]
	private float wantedAspectRatio = 1.5f;
	[SerializeField]
	private Color fillColor = Color.black;
	#endregion

	private Camera myCamera;
	private Camera backgroundCamera;

	void Awake() 
	{
		myCamera = GetComponent<Camera>();
	}
    
	void Start () 
	{
		// Set camera to our desired aspect ratio
		float currAspectRatio = (float)Screen.height / Screen.width;
		
		if (!Mathf.Approximately (currAspectRatio, wantedAspectRatio)) 
		{
			if (currAspectRatio < wantedAspectRatio)
			{
				// Pillarbox
				float padding = 1f - currAspectRatio/wantedAspectRatio;
				myCamera.rect = new Rect(padding / 2f, 0f, 1f-padding, 1f);
			}
			else
			{
				// Letterbox
				float padding = 1f - wantedAspectRatio/currAspectRatio;
				myCamera.rect = new Rect(0, padding / 2f, 1f, 1f - padding);
			}
			
			// Add a secondary, background camera just to paint the background black when letterboxing or pillarboxing 
			// is enabled.
			if (!GameObject.Find("BackgroundCam"))
			{
				backgroundCamera = new GameObject("BackgroundCam", typeof(Camera)).GetComponent<Camera>();
				backgroundCamera.depth = int.MinValue;
				backgroundCamera.clearFlags = CameraClearFlags.SolidColor;
				backgroundCamera.backgroundColor = fillColor;
				backgroundCamera.cullingMask = 0;
			}
		}
	}
	
}