QualitySettings.antiAliasing

Description

Set The AA Filtering option.

Anti-aliasing value indicates the number of samples per pixel. If unsupported by the hardware or rendering API, the greatest supported number of samples less than the indicated number is used.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Start() {
        QualitySettings.antiAliasing = 2;
    }
}

See Also: Quality Settings.