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

public class StopGo : MonoBehaviour
{
    public float startSpeed_Min = 60;
    public float startSpeed_Max = 300;
    public float nextSpeed;

    private Rigidbody rb;
    private GameObject target;

    private float timeCount = 0;
    public float stopTime = 3; // 弾が生成後、何秒したら停止するか？

    private float stopTimeCount = 0;
    private float nextStartTime = 2; // 弾が停止後、何秒したら動き出すか？

    private bool stopKey = false;

    void Start()
    {
        rb = GetComponent<Rigidbody>();

        // 初速はランダムにする。
        rb.AddForce(-transform.forward * Random.Range(startSpeed_Min, startSpeed_Max));

        target = GameObject.Find("Player");
    }

    void Update()
    {
        timeCount += Time.deltaTime;

        if(timeCount >= stopTime && !stopKey)
        {
            stopTimeCount += Time.deltaTime;
            rb.velocity = Vector3.zero; // 弾の速度を０にする＝弾を停止させる。

            // 弾の色を変える
            GetComponent<MeshRenderer>().material.color = Color.white;

            if(stopTimeCount >= nextStartTime)
            {
                if(target != null)
                {
                    // プレーヤーの方向に向きを変える。
                    this.gameObject.transform.LookAt(target.transform.position);
                }
                
                rb.AddForce(transform.forward * nextSpeed);
                stopKey = true;
            }
        }
    }
}

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

public class Gene_StopGo : MonoBehaviour
{
    public GameObject stopGoPrefab;
    private int timeCount;

    void Update()
    {
        timeCount += 1;

        if(timeCount % 100 == 0)
        {
            GameObject stopGo = Instantiate(stopGoPrefab, transform.position, Quaternion.identity);
            Destroy(stopGo, 10f);
        }
    }
}