Quaternion.AngleAxis

public static Quaternion AngleAxis (float angle, Vector3 axis);

Descripción

Crea una rotación que gira angle grados alrededor del axis.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void Example() {
        transform.rotation = Quaternion.AngleAxis(30, Vector3.up);
    }
}