Unity3D - 为什么我的对象不会每秒移动每一帧

Question

我正在努力解决非常奇怪且可能很简单的问题，我创建了一个机器人，他的任务是向目标移动我的意思是我在无效更新中使用 Vector3.MoveTowards 函数来每帧移动我的机器人，但问题是他只在移动一次并停下来，他正在迈出一步，而不是例如 100。我正在使用 Unity3D。 这是源代码；

public class Test01 : MonoBehaviour
{
public float speed, stopDist, rotationSpeed, moveSpeed, minSpeed, maxBackSpeed, maxFrontSpeed, turnSpeed, riseSpeed;
public Transform target;
private Rigidbody rb;
private float currentSpeed;

public bool isFinding = false;
private PlaySound signal;

void Start()
{
    signal = GameObject.FindGameObjectWithTag("Signal").GetComponent<PlaySound>();
    rb = GetComponent<Rigidbody>();
}

private void Update()
{
    // If space key button is pressed the robot's isFinding bool is becaming true and robot is starting searching for target.
    if (Input.GetKeyDown(KeyCode.Space))
    {
        isFinding = true;
        if (Vector3.Distance(transform.position, target.position) > stopDist)
        {
            transform.position = Vector3.MoveTowards(transform.position, target.position, speed * Time.deltaTime);
            signal.isAlarming = true;
            signal.Sound();
        }
        else if (Vector3.Distance(transform.position, target.position) < stopDist)
        {
            isFinding = false;
            signal.isAlarming = false;
            SoundManager.instance.StopSound();
            StopChasing();
        }
    }
}
 public void StopChasing()
{
    transform.position = this.transform.position;
}

Answer 1

Input.GetKeyDown是您按下键时的功能。

您可能希望将其更改为Input.GetKey ，这样每次您保持空间时它都会移动。

像这样，

private void Update()
{
    // If space key button is pressed the robot's isFinding bool is becaming true and robot is starting searching for target.
    if (Input.GetKey(KeyCode.Space))
    {
        isFinding = true;
        if (Vector3.Distance(transform.position, target.position) > stopDist)
        {
            transform.position = Vector3.MoveTowards(transform.position, target.position, speed* Time.deltaTime);
            signal.isAlarming = true;
            signal.Sound();
        }
        else if (Vector3.Distance(transform.position, target.position) < stopDist)
        {
            isFinding = false;
            signal.isAlarming = false;
            SoundManager.instance.StopSound();
            StopChasing();
        }
    }
}

---

如果您使用Input.GetKeyDown为机器人开始定位。 然后像这样分割

private void Update()
{
    // If space key button is pressed the robot's isFinding bool is becaming true and robot is starting searching for target.
    if (Input.GetKeyDown(KeyCode.Space))
    {
        isFinding = true;
    }
    if (isFinding)
    {
        if (Vector3.Distance(transform.position, target.position) > stopDist)
        {
            transform.position = Vector3.MoveTowards(transform.position, target.position, speed* Time.deltaTime);
            signal.isAlarming = true;
            signal.Sound();
        }
        else if (Vector3.Distance(transform.position, target.position) < stopDist)
        {
            isFinding = false;
            signal.isAlarming = false;
            SoundManager.instance.StopSound();
            StopChasing();
        }
    }
}

---

毕竟，您之前所做的并没有真正使用isFinding作为任何东西，您只需将其设置为 true 并且它不会对代码产生任何影响。

Answer 2

好吧，目前您将所有内容都嵌套在GetKeyDown下，因此它只执行一次。

你可以改变那样做

if (Input.GetKeyDown(KeyCode.Space))
{
    isFinding = true;
}

if(isFinding)
{
    if (Vector3.Distance(transform.position, target.position) > stopDist)
    {
        transform.position = Vector3.MoveTowards(transform.position, target.position, speed * Time.deltaTime);
        signal.isAlarming = true;
        signal.Sound();
    }
    else
    {
        isFinding = false;
        signal.isAlarming = false;
        SoundManager.instance.StopSound();
        StopChasing();
    }
}

所以按一次Space激活isFinding模式，直到它到达Vector3.Distance(transform.position, target.position) < stopDist