unity c# change game resolution
using UnityEngine;
public class ExampleScript : MonoBehaviour
{
void Start()
{
// Switch to 640 x 480 full-screen
Screen.SetResolution(640, 480, true);
// Switch to 640 x 480 full-screen at 60 hz
Screen.SetResolution(640, 480, true, 60);
// Switch to 800 x 600 windowed
Screen.SetResolution(800, 600, false);
}
}
//A resolution switch does not happen immediately;
//it will actually happen when the current frame is finished.