Change width and height of camera independently of each other,Change height and width of camera without changing size of display

Question

Hi, I am fairly new to unity and c# and I am mostly just doing this for learning purposes.

I want to make a game where the camera's width and height can change independently of each other, and rather than changing the size of the game on the screen, it maintains the same size and stretches or squishes the environment to do it. I don't know how to change the viewport rectangle values with a script and I can't figure out how to do it by looking it up, because every time I save my script it gives an error that says "object reference not set to an instance of an object". I'm sorry if this is a stupid question but I'm very inexperienced in programming and I'm a lot more used to python, so this is all new to me.

Here is my script so far:

 public class CameraScale : MonoBehaviour
 {
 
     public float cScaleX = 1f;
     
     public float cScaleY = 1f;
 
     GameObject CameraGameObject = GameObject.Find("Camera");
 
     Rect cameraRect = new Rect(0, 0, 1, 1);
 
     void Update() {
     
         cScaleX *= (1f + (0.001f * Input.GetAxisRaw("CameraScaleX")));
     
         cScaleY *= (1f + (0.001f * Input.GetAxisRaw("CameraScaleY")));
 
         cameraRect.width = cScaleX;
         cameraRect.height = cScaleY;
         cameraRect.center = new Vector2(0.5f,0.5f);
 
         CameraGameObject.viewportRect = cameraRect;
     
     }
 }

The cScaleX and Y variables are how tall and wide the camera should be and they are controlled with the arrow keys.

Answer 1

Changing the viewport won't do anything like that - you'll need to modify the camera's projection matrix;

 //Cache the camera
 private Camera cam;
 
 //This is the scaling factor for each axis
 [SerializeField]
 private Vector2 scale = Vector2.one;
 
 //Before any objects are drawn
 void OnPreCull ()
 {
     //Find and store the attached camera if we don't already have it cached
     if (!cam)
         cam = GetComponent<Camera>();
 
     //These functions create projection matrices for both orthographic and perspective projection. Choose between them based on the camera's settings
     Matrix4x4 proj;
     if (cam.orthographic)
         proj = Matrix4x4.Ortho (-cam.orthographicSize * scale.x, cam.orthographicSize * scale.x, -cam.orthographicSize * scale.y, cam.orthographicSize * scale.y, cam.nearClipPlane, cam.farClipPlane)
     else
         proj = Matrix4x4.Perspective (cam.fieldOfView, scale.x / scale.y, cam.nearClipPlane, cam.farClipPlane);
 
     //Set the camera's projection matrix
     cam.projectionMatrix = proj;
 }
 
 void OnDisable ()
 {
     //*Important* Reset the camera's projection matrix when this is disabled/the scene ends or things will start to break
     if (cam)
         cam.ResetProjectionMatrix ();
 }

https://docs.unity3d.com/ScriptReference/Matrix4x4.Ortho.html
https://docs.unity3d.com/ScriptReference/Matrix4x4.Perspective.html

Change width and height of camera independently of each other,Change height and width of camera without changing size of display

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