c# - 为什么相机不旋转以面对第一个航路点？

Question

游戏开始时，从数组中随机选择一个航路点。然后相机应旋转以面向选定的随机航点并开始向其移动。

一旦相机到达路点，它应该等待 3 秒钟，然后再旋转面对并朝着下一个随机路点移动。

我遇到的问题在Start(). 在开始向第一个航路点移动之前，相机不会旋转以面对第一个航路点。相反，它向后移动到第一个航路点。然后，当它到达路点时，它会等待 3 秒旋转并朝下一个路点移动。

它工作正常，只是相机不会旋转以面对第一个选择的随机航点。它在没有先旋转面对它的情况下向后移动。

这是我的代码：

航点脚本

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

public class Waypoints : MonoBehaviour
{
    public GameObject[] waypoints;
    public GameObject player;
    public float speed = 5;
    public float WPradius = 1;
    public LookAtCamera lookAtCam;

    private int current = 0;
    private bool rot = false;

    public void Init()
    {
        waypoints = GameObject.FindGameObjectsWithTag("Target");

        if(waypoints.Length > 0)
        {
            StartCoroutine(RotateFacingTarget(waypoints[UnityEngine.Random.Range(0, waypoints.Length)].transform));
        }
    }

    void Update()
    {
        if (waypoints.Length > 0)
        {
            if (Vector3.Distance(waypoints[current].transform.position, transform.position) < WPradius)
            {
                current = UnityEngine.Random.Range(0, waypoints.Length);
                rot = false;
                StartCoroutine(RotateFacingTarget(waypoints[current].transform));

                if (current >= waypoints.Length)
                {
                    current = 0;
                }
            }

            if (rot)
                transform.position = Vector3.MoveTowards(transform.position, waypoints[current].transform.position, Time.deltaTime * speed);
        }
    }

    IEnumerator RotateFacingTarget(Transform target)
    {
        yield return new WaitForSeconds(3);

        lookAtCam.target = target;
        rot = true;
    }
}

看看相机脚本

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

public class LookAtCamera : MonoBehaviour
{
    //values that will be set in the Inspector
    public Transform target;
    public float RotationSpeed;

    //values for internal use
    private Quaternion _lookRotation;
    private Vector3 _direction;

    // Update is called once per frame
    void Update()
    {
        //find the vector pointing from our position to the target
        if (target)
        {
            _direction = (target.position - transform.position).normalized;

            //create the rotation we need to be in to look at the target
            _lookRotation = Quaternion.LookRotation(_direction);

            //rotate us over time according to speed until we are in the required rotation
            transform.rotation = Quaternion.Slerp(transform.rotation, _lookRotation, Time.deltaTime * RotationSpeed);
        }
    }
}

我怎样才能解决这个问题？

标签： c#unity3d

Answer 1

假设Waypoints.Init()正在调用它，并且您的waypoints变量的数组为 3。

• Waypoints.Init()启动协程
  • 你的协程等待 3 秒
  • 3秒后，您将相机目标设置Slerp为朝向该位置
• Update在它的第一帧上说waypoints.Length > 0 == true
  • 它没有靠近它的目标，并且rot是假的，所以它不会移动

现在，您等待 3 秒，不旋转，也不移动。

• 你的协程的 3 秒等待时间到了，开始向你的目标旋转
• rot现在在您的旋转开始时为真，因此您的Update方法也开始向目标移动

看起来您的逻辑在操作顺序的工作方式上是错误的。如果它需要像你描述的那样行动，我建议你对目标进行不同的操作。

我已经使用枚举实现了以下内容：

航点

public class Waypoints : MonoBehaviour
{
    private GameObject[] waypoints;
    private Transform currentWaypoint;

    private enum CameraState
    {
        StartRotating,
        Rotating,
        Moving,
        Waiting
    }

    private CameraState cameraState;

    public GameObject player;
    public float speed = 5;
    public float WPradius = 1;
    public LookAtCamera lookAtCam;

    private int current = 0;
    private bool isCameraRotating = false;

    void Start()
    {
        cameraState = CameraState.StartRotating;
    }

    void Update()
    {
        switch (cameraState)
        {
            // This state is used as a trigger to set the camera target and start rotation
            case CameraState.StartRotating:
            {
                // Sanity check in case the waypoint array was set to length == 0 between states
                if (waypoints.Length == 0)
                    break;

                // Tell the camera to start rotating
                currentWaypoint = waypoints[UnityEngine.Random.Range(0, waypoints.Length)].transform;
                lookAtCam.target = currentWaypoint;
                cameraState = CameraState.Rotating;

                break;
            }

            // This state only needs to detect when the camera has completed rotation to start movement
            case CameraState.Rotating:
            {
                if (lookAtCam.IsFinishedRotating)
                    cameraState = CameraState.StartMoving;

                break;
            }

            case CameraState.Moving:
            {
                // Move
                transform.position = Vector3.MoveTowards(transform.position, currentWaypoint.position, Time.deltaTime * speed);

                // Check for the Waiting state
                if (Vector3.Distance(currentWaypoint.position, transform.position) < WPradius)
                {
                    // Set to waiting state
                    cameraState = CameraState.Waiting;

                    // Call the coroutine to wait once and not in CameraState.Waiting
                    // Coroutine will set the next state
                    StartCoroutine(WaitForTimer(3));
                }

                break;
            }
            case CameraState.Waiting:
                // Do nothing. Timer has already started
                break;
        }
    }

    IEnumerator WaitForTimer(float timer)
    {
        yield return new WaitForSeconds(timer);
        cameraState = CameraState.StartRotating;
    }

    public void RefreshWaypoints()
    {
        waypoints = GameObject.FindGameObjectsWithTag("Target");
    }
}

看相机

public class LookAtCamera : MonoBehaviour
{
    // Values that will be set in the Inspector
    public Transform target;
    public float RotationSpeed;

    private float timer = 0.0f;
    public bool IsRotationFinished
    {
        get { return timer > 0.99f; }
    }

    // Update is called once per frame
    void Update()
    {
        if (target != null && timer < 0.99f)
        {
            // Rotate us over time according to speed until we are in the required rotation
            transform.rotation = Quaternion.Slerp(transform.rotation,
                Quaternion.LookRotation((target.position - transform.position).normalized),
                timer);

            timer += Time.deltaTime * RotationSpeed;
        }
    }
}