（１）下準備

• オブジェクトを１つ作成

（２）スクリプトの作成

①PingPongを使用する方法

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

public class Move_PingPong : MonoBehaviour
{
    private Vector3 pos;

    void Start()
    {
        pos = transform.position;
    }

    void Update()
    {
        transform.position = new Vector3(pos.x + Mathf.PingPong(Time.time, 5), pos.y, pos.z);
    }
}

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②Sinを使用する方法

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

public class Move_Sin : MonoBehaviour
{
    private Vector3 pos;

    void Start()
    {
        pos = transform.position;
    }

    void Update()
    {
        transform.position = new Vector3(pos.x + Mathf.Sin(Time.time) * 5, pos.y, pos.z);
    }
}

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③Positionを変化させる方法

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

public class Move_Position : MonoBehaviour
{
    public float speed;
    private Vector3 pos;
    private bool isStop = false;

    void Start()
    {
        pos = transform.position;
    }

    void Update()
    {
        if (!isStop)
        {
            pos.x += Time.deltaTime * speed; // speedは移動速度
            transform.position = pos;

            if (pos.x > 15) // 終点（自由に変更可能）
            {
                isStop = true;
            }
        }
        else
        {
            pos.x -= Time.deltaTime * speed;
            transform.position = pos;

            if (pos.x < 0) // 始点（自由に変更可能）
            {
                isStop = false;
            }
        }
    }
}

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