来回移动游戏对象 [英] Move GameObject back and forth

问题描述

我有一个对象，我想向上移动到 A 点，当它到达 A 点时，它应该移动到 B 点.当它到达 B 点时，它应该移动回 A 点.

I got an Object that I want to move up to Point A and when it reaches Point A it should move to Point B. When it reaches Point B it should move back to Point A.

我想我可以为此使用 Vector3.Lerp

I thought I could use Vector3.Lerp for this

void Update()
{
  transform.position = Vector3.Lerp(pointA, pointB, speed * Time.deltaTime);
}

但是我怎么能搬回去呢?有没有一种优雅的方式来存档?显然，我需要这样 2 个 Lerp:

But how can i move back then? Is there an elegant way to archieve this? Obviously I would need 2 Lerps like this way:

void Update()
{
  transform.position = Vector3.Lerp(pointA, pointB, speed * Time.deltaTime); // Move up
  transform.position = Vector3.Lerp(pointB, pointA, speed * Time.deltaTime); // Move down
}

有人可以帮我吗?

推荐答案

有很多方法可以做到这一点，但 Mathf.PingPong 是实现这一目标的最简单、最简单的方法.使用 Mathf.PingPong 获取0 和 1 然后将该值传递给 Vector3.Lerp.就是这样.

There are many ways to do this but Mathf.PingPong is the easiest and the simplest way to accomplish this. Use Mathf.PingPong to get number between 0 and 1 then pass that value to Vector3.Lerp. That's it.

Mathf.PingPong 将自动返回值会在 0 和 1 之间来回移动.阅读链接的文档了解更多信息.

Mathf.PingPong will automatically return value will that will move back and forth between 0 and 1. Read the linked documentation for more info.

public float speed = 1.19f;
Vector3 pointA;
Vector3 pointB;

void Start()
{
    pointA = new Vector3(0, 0, 0);
    pointB = new Vector3(5, 0, 0);
}

void Update()
{
    //PingPong between 0 and 1
    float time = Mathf.PingPong(Time.time * speed, 1);
    transform.position = Vector3.Lerp(pointA, pointB, time);
}

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