Auto Resolution Script

It's useful for overcoming very slight differences.

It is difficult to apply a large changes in which the resolution is reversed.

It can be used appropriately in situations where resolution is important in mobile-like environments.

Attach this script to the camera and enter the desired resolution.

Assets/Scripts/Camera/AutoResolution.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class AutoResolution : MonoBehaviour
+{
+        public int setWidth = 1440;
+        public int setHeight = 2560;
+
+        private void Start()
+        {
+            // Get the main camera and its current dimensions
+            Camera camera = Camera.main;
+            Rect rect = camera.rect;
+
+            // Calculate the scale height and width of the screen
+            float scaleHeight = ((float)Screen.width / Screen.height) / ((float)9 / 16);
+            float scaleWidth = 1f / scaleHeight;
+
+            // Adjust the camera's dimensions based on the scale height and width
+            if (scaleHeight < 1)
+            {
+                rect.height = scaleHeight;
+                rect.y = (1f - scaleHeight) / 2f;
+            }
+            else
+            {
+                rect.width = scaleWidth;
+                rect.x = (1f - scaleWidth) / 2f;
+            }
+
+            camera.rect = rect;
+
+            SetResolution();
+        }
+
+        public void SetResolution()
+        {
+            // Get the current device's screen dimensions
+            int deviceWidth = Screen.width;
+            int deviceHeight = Screen.height;
+
+            // Set the screen resolution to the desired dimensions, while maintaining aspect ratio
+            Screen.SetResolution(setWidth, (int)(((float)deviceHeight / deviceWidth) * setWidth), true);
+
+            // Adjust the camera's dimensions based on the new resolution
+            if ((float)setWidth / setHeight < (float)deviceWidth / deviceHeight)
+            {
+                float newWidth = ((float)setWidth / setHeight) / ((float)deviceWidth / deviceHeight);
+                Camera.main.rect = new Rect((1f - newWidth) / 2f, 0f, newWidth, 1f);
+            }
+            else
+            {
+                float newHeight = ((float)deviceWidth / deviceHeight) / ((float)setWidth / setHeight);
+                Camera.main.rect = new Rect(0f, (1f - newHeight) / 2f, 1f, newHeight); // 새로운 Rect 적용
+            }
+        }
+}