Unity之绕轴进行旋转

先上一张效果图

using UnityEngine;
using System.Collections;

public class TestRotateRound : MonoBehaviour
{
    public GameObject Sphere;
    private float curtTime = 0.0f;
    void Update()
    {
        //使用C#封装好的代码RotateAround
        gameObject.transform.RotateAround(Sphere.transform.position, Sphere.transform.up, 72 * Time.deltaTime);
        //自己封装代码,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)
    {
        //绕axis轴旋转angle角度
        Quaternion rotation = Quaternion.AngleAxis(angle, axis);
        //旋转之前,以center为起点,transform.position当前物体位置为终点的向量.
        Vector3 beforeVector = transform.position - center;
        //四元数 * 向量(不能调换位置, 否则发生编译错误)
        Vector3 afterVector = rotation * beforeVector;//旋转后的向量
        //向量的终点 = 向量的起点 + 向量
        transform.position = afterVector + center;

        //看向Sphere,使Z轴指向Sphere
        transform.LookAt(Sphere.transform.position);
    }
}