Quaternion.Angle

public static float Angle (Quaternion a, Quaternion b);

Description

返回两个旋转 a 和 b 之间的角度（以度为单位）。

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public Transform target;
    void Update() {
        float angle = Quaternion.Angle(transform.rotation, target.rotation);
    }
}