QualitySettings.SetQualityLevel

Parameters

Description

Sets a new graphics quality level.

The list of quality levels can be found by going to Edit > Project Settings > Quality. You can add, remove or edit these.

using UnityEngine;

public class Example : MonoBehaviour
{
    void OnGUI()
    {
        string[] names = QualitySettings.names;
        GUILayout.BeginVertical();
        for (int i = 0; i < names.Length; i++)
        {
            if (GUILayout.Button(names[i]))
            {
                QualitySettings.SetQualityLevel(i, true);
            }
        }
        GUILayout.EndVertical();
    }
}

Note that changing the quality level can be an expensive operation if the new level has different anti-aliasing setting. It's fine to change the level when applying in-game quality options, but if you want to dynamically adjust quality level at runtime, pass false to applyExpensiveChanges so that expensive changes are not always applied.

When building a player quality levels that are not used for that platform are stripped. You should not expect a given quality setting to be at a given index. It's best to query the available quality settings and use the returned index.

Additional resources: GetQualityLevel.