unity中實現物體在一定角度范圍內來回旋轉

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Rotate : MonoBehaviour {
    private float origionZ;
    private Quaternion targetRotation;
    public float RotateAngle = 60;
    public int count = 0;
    private bool i;
    // Use this for initialization
    void Start () {
        origionZ = transform.rotation.z;
    }
    
    // Update is called once per frame
    void Update () {
        if (Input.GetKeyDown(KeyCode.D))//當按下D時進行旋轉
        {
            if (count >= 3)
            {
                i = false;
            }
            if (count <= 0)
            {
                i = true;
            }
            
            if (i == true)
            {
                count++;
                targetRotation = Quaternion.Euler(0, 180, RotateAngle * count + origionZ) * Quaternion.identity;
            }
            if(i==false)
            {
                count--;
                targetRotation = Quaternion.Euler(0,180,RotateAngle*count+origionZ) * Quaternion.identity;
            }
            

        }
        else
        {
            transform.rotation = Quaternion.Slerp(transform.rotation, targetRotation, Time.deltaTime * 2);
            //避免誤差
            if (Quaternion.Angle(targetRotation, transform.rotation) < 1)
                transform.rotation = targetRotation;
        }

    }
}

使用四元數可以避免萬向鎖的問題，並且實現平滑轉化。當按下D鍵時，物體的z軸會旋轉60度，在該腳本中，物體的Z軸在0~180度之間來回變化，其中count的值可以改變，造成的結果就是角度范圍和旋轉次數的變化。

該腳本可適用於uinty中需要旋轉指示的對象，如按鈕，把手，門等物體。