Unity 2d Camera Scale to Screen Size - unity3d

Question

I am looking to scale a orthographic camera in unity 2d to screen size.
When you edit your game you orient the camera in a way you want it to be, view all your objects etc.
But then when you maximise it your camera zooms out showing maybe other things you don't want to show
Images for example
Edit Mode View
Maximised
Thank you if you can answer my question
Best Regards
Dawid

Answer 1

Attach the following component to your camera. Make sure to set the target aspect ratio in the inspector (16/9 for example).
using UnityEngine;
[ExecuteAlways]
[RequireComponent(typeof(Camera))]
public class ViewportScaler : MonoBehaviour
{
private Camera _camera;
[Tooltip("Set the target aspect ratio.")]
[SerializeField] private float _targetAspectRatio;
private void Awake()
{
_camera = GetComponent<Camera>();
if (Application.isPlaying)
ScaleViewport();
}
private void Update()
{
#if UNITY_EDITOR
if (_camera)
ScaleViewport();
#endif
}
private void ScaleViewport()
{
// determine the game window's current aspect ratio
var windowaspect = Screen.width / (float) Screen.height;
// current viewport height should be scaled by this amount
var scaleheight = windowaspect / _targetAspectRatio;
// if scaled height is less than current height, add letterbox
if (scaleheight < 1)
{
var rect = _camera.rect;
rect.width = 1;
rect.height = scaleheight;
rect.x = 0;
rect.y = (1 - scaleheight) / 2;
_camera.rect = rect;
}
else // add pillarbox
{
var scalewidth = 1 / scaleheight;
var rect = _camera.rect;
rect.width = scalewidth;
rect.height = 1;
rect.x = (1 - scalewidth) / 2;
rect.y = 0;
_camera.rect = rect;
}
}
}

Answer 2

I'd like to expand on #sean-carey 's very useful answer.
I modified his code in order to add a min and max aspect ratio, so the viewport will be full screen in between those two aspects, and will pillarbox when < min and letterbox when > max
using UnityEngine;
[ExecuteAlways]
[RequireComponent(typeof(Camera))]
public class ViewportController : MonoBehaviour
{
private Camera _camera;
[Tooltip("Set the target aspect ratio.")]
[SerializeField] private float _minAspectRatio;
[SerializeField] private float _maxAspectRatio;
private void Awake()
{
_camera = GetComponent<Camera>();
if (Application.isPlaying)
ScaleViewport();
}
private void Update()
{
#if UNITY_EDITOR
if (_camera)
ScaleViewport();
#endif
}
private void ScaleViewport()
{
// determine the game window's current aspect ratio
var windowaspect = Screen.width / (float) Screen.height;
// current viewport height should be scaled by this amount
var letterboxRatio = windowaspect / _minAspectRatio;
var pillarboxRatio = _maxAspectRatio / windowaspect;
// if max height is less than current height, add letterbox
if (letterboxRatio < 1)
{
SetRect(1, letterboxRatio, 0, (1-letterboxRatio)/2);
}
// if min height is more than current height, add pillarbox
else if (pillarboxRatio < 1)
{
SetRect(pillarboxRatio, 1, (1-pillarboxRatio)/2, 0);
}
// full screen
else
{
SetRect(1, 1, 0, 0);
}
}
private void SetRect(float w, float h, float x, float y)
{
var rect = _camera.rect;
rect.width = w;
rect.height = h;
rect.x = x;
rect.y = y;
_camera.rect = rect;
}
}