using UnityEngine;
using System.Collections;
public class TestRotateRound : MonoBehaviour
{
    public GameObject Sphere;
    private float curtTime = 0.0f;
    void Update()
    {
        //使用C#封裝好的代碼RotateAround
        gameObject.transform.RotateAround(Sphere.transform.position, Sphere.transform.up, 72 * Time.deltaTime);
        //自己封裝代碼,功能和上面的相同
        //RotateAround(Sphere.transform.position,Vector3.up, 72 * Time.deltaTime);
    }
    private void RotateAround(Vector3 center, Vector3 axis, float angle)
    {
        //繞axis軸旋轉(zhuǎn)angle角度
        Quaternion rotation = Quaternion.AngleAxis(angle, axis);
        //旋轉(zhuǎn)之前,以center為起點(diǎn),transform.position當(dāng)前物體位置為終點(diǎn)的向量.
        Vector3 beforeVector = transform.position - center;
        //四元數(shù) * 向量(不能調(diào)換位置, 否則發(fā)生編譯錯(cuò)誤)
        Vector3 afterVector = rotation * beforeVector;//旋轉(zhuǎn)后的向量
        //向量的終點(diǎn) = 向量的起點(diǎn) + 向量
        transform.position = afterVector + center;
        //看向Sphere,使Z軸指向Sphere
        transform.LookAt(Sphere.transform.position);
    }
}

        public static void RotateClampX(this Transform t, float degree, float min, float max)
        {
            degree = (t.localEulerAngles.x - degree);
            if (degree > 180f)
            {
                degree -= 360f;
            }
            degree = Mathf.Clamp(degree, min, max);
            t.localEulerAngles = t.localEulerAngles.SetX(degree);
        }

myTransform.rotation = Quaternion.Slerp(myTransform.rotation, Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed * Time.deltaTime);