角色不改变方向

问题描述

我有一个角色，每两秒钟更改其朝向(左右).在两秒钟之后，速度乘以-1，因此它改变了方向，但一直保持向右(->)

I've got a character that changes its facing (right or left) every two seconds. After that two seconds, the speed is multiplied by -1, so it changes its direction, but it just keeps going right (->)

这是我的代码:

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

public class EnemyController : MonoBehaviour {

public int speed = 2;

void Start ()
{

    StartCoroutine(Animate ());
}

void Update ()
{
    float auto = Time.deltaTime * speed;
    transform.Translate (auto, 0, 0);
}

IEnumerator Animate()
{
    while (true) {
        yield return new WaitForSeconds (2);
        transform.rotation = Quaternion.LookRotation (Vector3.back);
        speed *= -1;
        yield return new WaitForSeconds (2);
        transform.rotation = Quaternion.LookRotation (Vector3.forward);
        speed *= -1;
    }
}
}

推荐答案

这是因为transform.Translate在其本地空间而不是世界空间中转换对象.

That's because transform.Translate translates the object in it's local space, not the world space.

当您执行以下操作时:

// The object will look at the opposite direction after this line
transform.rotation = Quaternion.LookRotation (Vector3.back);
speed *= -1;

您将对象翻转，然后要求您朝相反的方向前进.这样，物体将随后沿初始方向平移.

You flip your object and you ask to go in the opposite direction. Thus, the object will translate in the initial direction afterwards.

为解决您的问题，建议您不要更改speed变量的值.

To fix your problem, I advise you to not change the value of the speed variable.

尝试在相同的情况下想象自己:

Try to imagine yourself in the same situation :

1. 向前走
2. 旋转180度并向后走

最后，您沿同一方向继续"前进

In the end, you "continue" your path in the same direction

这是最终的方法:

IEnumerator Animate()
{
    WaitForSeconds delay = new WaitForSeconds(2) ;
    Quaterion backRotation = Quaternion.LookRotation (Vector3.back) ;
    Quaterion forwardRotation = Quaternion.LookRotation (Vector3.forward) ;
    while (true)
    {
        yield return delay;
        transform.rotation = backRotation;
        yield return delay;
        transform.rotation = forwardRotation;
    }
}

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