Auto Scale camera depending on Screen Size - How??

The last one, the Aspect ratio, you can set in the giant Game window tab. Forces your screen to be the same proportion as your phone, preventing cut-off surprises.

I tried to set the field of view that everything fits. But when I click on the play button. It resets the view. What's wrong?

Did you change the FOV on the camera object? Click on it in the hierarchy view and look at the value at runtime. If it is not the value you place there at edit time, then something in your scripts is resetting it. Note my suggestion above was to calculate the distance the camera needed to be at runtime and move the camera. If you have trouble translating the equation above into code, I can expand a bit.

I adjusted the FOV that everythings on the camera view. If I press on play the view gets reseted but it has the same value. It's strange.

Could you explain your calculation, please?

Given that your problem appears to happen in the editor, I suspect my calc will not be of help. There is something else going on. $$anonymous$$ake sure that your scripts are not changing the camera position or camera DOF.

Based on the calculations above, here is a bit of code. It is written expecting the camera to be looking towards positive Z and with the 2D surface for the game having a Z value of 0.0. You'll have to make appropriate changes if your setup is different. The public variable fWidth is the width in world coordinates you want the camera to see. If you don't know, you can either use the equation above to calculate the distance, or you can just place a couple of game objects in the scene and use their position to measure the distance.

Attach this to the camera:

 public class PositionCamera : $$anonymous$$onoBehaviour {
     
     public float fWidth = 9.0f;  // Desired width 
 
     void Start () {
         
         float fT = fWidth / Screen.width * Screen.height;
         fT = fT / (2.0f * $$anonymous$$athf.Tan (0.5f * Camera.main.fieldOfView * $$anonymous$$athf.Deg2Rad));
         Vector3 v3T = Camera.main.transform.position;
         v3T.z = -fT;
         transform.position = v3T;
     }
 }

Ok that makes sense. Thanks! So you recommend me to use 900x1200? (portrait? Or am I wrong?

Sorry for that question. I'm new on Unity.

Look up the aspect ratio of the phone (compute it from the pixel dims.)

Once you find the dropDown that says 16:9, 4:3, 5:4 ... it will make a lot more sense (try resizing that window with anything except FreeAspect selected.)

Ok now it looks good in the game view on the computer but now it's very small on the phone.