将游戏对象旋转到特定点[重复]

Question

在我的项目中，当我与桥发生碰撞时，我有一座桥，它旋转并且不停止旋转，我想要的是通过特定点旋转该桥并停止旋转，该桥位于游戏对象内这是我的枢轴点，一般我旋转枢轴点而不是桥，所以我这样做了：

using UnityEngine;
using System.Collections;

public class fallBridge : MonoBehaviour {

    private Rigidbody ball;
    public GameObject bridgePivot;
    private bool colided; 
    private bool rotating = true;
    // Update is called once per frame

    void Start(){
        colided = false;
    }

    void Update () {
        if (colided) {
            if (rotating) {
                Vector3 to = new Vector3 (0, 0, -85);
                if (Vector3.Distance (bridgePivot.transform.eulerAngles, to) > 0.01f) {
                    bridgePivot.transform.eulerAngles = Vector3.Lerp (bridgePivot.transform.rotation.eulerAngles, to, Time.deltaTime);
                } else {
                    bridgePivot.transform.eulerAngles = to;
                    rotating = false;
                }
            }
        }
    }

    void OnCollisionEnter(Collision other)
    {
        ball = GameObject.FindWithTag ("Player").GetComponent<Rigidbody> ();
        if (other.gameObject.tag == "Player" && ball.transform.localScale == new Vector3(2.0f,2.0f,2.0f)) {
            Debug.Log("ENTER");
            colided = true;
        }
    }
}

我做错了什么？？碰撞检测工作完美，但在更新方法上它永远不会停止旋转：S

Answer 1

你应该用协程来做这件事。在调用OnCollisionEnter 时，调用协程函数并传入要旋转的GameOjbect 和要旋转到的角度。您可以阅读此功能的工作原理here。

下面的示例将在 3 秒内沿 z 轴旋转 GameObject -85 度数。 您可以将其更改为适合您的任何内容。

public class fallBridge : MonoBehaviour
{
    private Rigidbody ball;
    public GameObject bridgePivot;
    bool rotating = false;

    void OnCollisionEnter(Collision other)
    {
        ball = GameObject.FindWithTag("Player").GetComponent<Rigidbody>();
        if (other.gameObject.CompareTag("Player") && ball.transform.localScale == new Vector3(2.0f, 2.0f, 2.0f))
        {
            Debug.Log("ENTER");
            Vector3 rotationAngle = new Vector3(0, 0, -85);
            StartCoroutine(RotateObject(bridgePivot, rotationAngle, 3f));
        }
    }

IEnumerator RotateObject(GameObject gameObjectToMove, Vector3 eulerAngles, float duration)
{
    if (rotating)
    {
        yield break;
    }
    rotating = true;

    Vector3 newRot = gameObjectToMove.transform.eulerAngles + eulerAngles;

    Vector3 currentRot = gameObjectToMove.transform.eulerAngles;

    float counter = 0;
    while (counter < duration)
    {
        counter += Time.deltaTime;
        gameObjectToMove.transform.eulerAngles = Vector3.Lerp(currentRot, newRot, counter / duration);
        yield return null;
    }
    rotating = false;
}

Answer 2

错误在这一行：

bridgePivot.transform.eulerAngles = Vector3.Lerp (bridgePivot.transform.rotation.eulerAngles, to, Time.deltaTime);

当您使用 Lerp 时，您通常有一个固定的开始和结束，并且您使最后一个参数 (t) 从 0 变为 1。在您的情况下，端点是固定的，t 参数也是固定的，您可以改变开始.这意味着您每次更新都会朝着目标迈出一小步，但这一步只是百分比。所以每次更新你都会更近一步，你的下一步会更小。

你应该做的是记住你开始的时候在哪里，什么时候开始的。您还需要为您的网桥定义一个速度。然后，您可以将桥从头移动到尾并控制速度。

public class fallBridge : MonoBehaviour {

    private Rigidbody ball;
    public GameObject bridgePivot;
    public float rotateDuration = 2; // Time in seconds
    // When you begin rotating you fill these three variables
    private float startTime;
    private Vector3 from;
    private bool rotating = false;
    // If the target doesn't change you might as well define it beforehand
    private Vector3 to = new Vector3 (0, 0, -85);

    void Update () {
        if (rotating) {
            float t = (Time.time - startTime) / rotateDuration;
            if (t < 1) {
                bridgePivot.transform.eulerAngles = Vector3.Lerp (from, to, t);
            } else {
                bridgePivot.transform.eulerAngles = to;
                rotating = false;
            }
        }
    }

    void OnCollisionEnter(Collision other)
    {
        ball = GameObject.FindWithTag ("Player").GetComponent<Rigidbody> ();
        if (other.gameObject.tag == "Player" && ball.transform.localScale == new Vector3(2.0f,2.0f,2.0f)) {
            Debug.Log("ENTER");
            startTime = Time.time; // Begin now
            from = bridgePivot.transform.eulerAngles; // Remember the start position
            rotating = true; // Signal to start rotating
        }
    }
}