Unity 物体从一个点移动到另一个点

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方式一

//两种方式效果一样
Transform.Translate（moveDir * Time.deltaTime * speed ,Space relativeTo）
//transform.position +=  moveDir * Time.deltaTime * speed

需要注意的是：moveDir表示移动方向，可以是Vector3.forward，也可以是endPosition-startPosition；

using UnityEngine;
using UnityEngine.UI;

public class MoveTest : MonoBehaviour
{
    Vector3 endPosition = new Vector3(3, 3, 3);
    Vector3 startPosition ;
    bool isStart = false;
    float speed = 1;
    Vector3 moveDir;
    float distance;

    public Button btn;

    void Start()
    {
        startPosition = transform.position;
        endPosition.y = transform.position.y;
        moveDir = endPosition - startPosition;
        distance = Vector3.Distance(startPosition, endPosition);

        btn.onClick.AddListener(StartRun);
    }

    public void StartRun() {
        transform.position = startPosition;

        isStart = true;
    }

    void Update()
    {
        if (isStart) {
            //下面3行代码一样的效果
            transform.Translate(moveDir * Time.deltaTime * speed, Space.World);
            //transform.position += moveDir * Time.deltaTime * speed;
            
            float dis = Vector3.Distance(startPosition, transform.position);
            if (dis >= distance) {
                isStart = false;
            }
        }
    }
}

方式二

Vector3 vec = Vector3.Lerp(startPosition, endPosition, progress);
transform.position = vec;

需要注意的是，progress是一个[0-1]之间的值，如果progress=0.1，那么vec的值就在两点的1/10位置处；如果progress=0.2，那么vec的值就在两点的2/10位置处；

using UnityEngine;
using UnityEngine.UI;

public class Move_Lerp : MonoBehaviour
{
    Vector3 endPosition = new Vector3(2, 2, 2);
    Vector3 startPosition;
    bool isStart = false;
    float speed = 1;
    float totalTime;
    float currentTime;

    public Button btn;

    void Start()
    {
        startPosition = transform.position;
        endPosition.y = transform.position.y;

        totalTime = Vector3.Distance(startPosition, endPosition) / speed;

        btn.onClick.AddListener(StartRun);
    }

    void StartRun()
    {
        transform.position = startPosition;

        isStart = true;
        currentTime = 0;
    }

    void Update()
    {
        if (isStart)
        {
            currentTime += Time.deltaTime;
            Vector3 vec = Vector3.Lerp(startPosition, endPosition, currentTime / totalTime);
            transform.position = vec;
        }
    }
}

方式三

transform.position = Vector3.MoveTowards(currentPosition, targetPosition, Time.deltaTime * speed);

需要注意的是currentPosition表示的是自己的实时位置

using UnityEngine;
using UnityEngine.UI;

public class MoveToTowards : MonoBehaviour
{

    Vector3 endPosition = new Vector3(3, 3, 3);
    Vector3 startPosition;
    bool isStart = false;
    float speed = 1;

    public Button btn;

    void Start()
    {
        startPosition = transform.position;
        endPosition.y = transform.position.y;

        btn.onClick.AddListener(StartRun);
    }

    public void StartRun()
    {
        transform.position = startPosition;

        isStart = true;
    }

    void Update()
    {
        if (isStart)
        {
            transform.position = Vector3.MoveTowards(transform.position, endPosition, Time.deltaTime * speed);
        }
    }
}