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

public class EnemyCore : MonoBehaviour
{
    public int coreHP;
    public GameObject effectPrefab;
    public AudioClip sound;

    void Update()
    {
        if(coreHP < 1)
        {
            // rootを使うことで「親オブジェクト」を指定できる（重要）
            Destroy(transform.root.gameObject);

            GameObject effect = Instantiate(effectPrefab, transform.position, Quaternion.identity);
            Destroy(effect, 0.5f);
            AudioSource.PlayClipAtPoint(sound, transform.position);
        }
    }
}

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

[RequireComponent(typeof(LineRenderer))]
[RequireComponent(typeof(AudioSource))]
public class RayShot : MonoBehaviour
{
    public Transform gunPoint;
    private float fireRate = 0.25f;
    private float weaponRange = 50f;
    private float hitForce = 300f;
    private Camera FPSCamera;
    private WaitForSeconds shotDuration = new WaitForSeconds(0.07f);
    private AudioSource gunAudio;
    private LineRenderer laserLine;
    private float nextFire;

    private enum Mode
    {
        Normal,
        ZeroGravity,
        Gravity
    }

    private Mode mode;
    private int modeTotalNum;
    private int num = 0;
    private MeshRenderer mr;

    public AudioClip[] shotSounds;
    public Material[] materials;
    public AudioClip changeSound;
    public GameObject laserGun;

    // ★追加（敵の破壊）
    public AudioClip damageSound;
    public AudioClip reflectSound;

    void Start()
    {
        laserLine = GetComponent<LineRenderer>();
        gunAudio = GetComponent<AudioSource>();
        FPSCamera = GetComponent<Camera>();
        laserLine.enabled = false;
        modeTotalNum = System.Enum.GetValues(typeof(Mode)).Length;
        mr = laserGun.GetComponent<MeshRenderer>();
    }

    void Update()
    {
        ChangeMode();

        Debug.DrawRay(transform.position, transform.forward * 60, Color.red);

        if (Input.GetMouseButtonDown(0) && Time.time > nextFire)
        {
            nextFire = Time.time + fireRate;
            StartCoroutine(ShotEffect());
            Vector3 rayOrigin = FPSCamera.ViewportToWorldPoint(new Vector3(0.5f, 0.5f, 0));
            RaycastHit hit;
            laserLine.SetPosition(0, gunPoint.position);

            if (Physics.Raycast(rayOrigin, FPSCamera.transform.forward, out hit, weaponRange))
            {
                laserLine.SetPosition(1, hit.point);

                // ★追加（敵の破壊）
                string hitTag = hit.transform.gameObject.tag;

                if(hitTag == "EnemyCore")
                {
                    // 敵のコアのHPを減少させる
                    hit.transform.gameObject.GetComponent<EnemyCore>().coreHP -= 1;
                    AudioSource.PlayClipAtPoint(damageSound, transform.position);
                }

                if(hitTag == "EnemyBody")
                {
                    // 敵のボディを攻撃してもHPは減少できない。
                    AudioSource.PlayClipAtPoint(reflectSound, transform.position);
                }

                // 以上、ここまで

                if (hit.rigidbody != null)
                {
                    hit.rigidbody.AddForce(-hit.normal * hitForce);

                    switch(mode)
                    {
                        case Mode.ZeroGravity:
                            hit.rigidbody.useGravity = false;
                            break;
                        case Mode.Gravity:
                            hit.rigidbody.useGravity = true;
                            break;
                    }
                }
            }
            else
            {
                laserLine.SetPosition(1, rayOrigin + (FPSCamera.transform.forward * weaponRange));
            }
        }
    }

    private IEnumerator ShotEffect()
    {
        gunAudio.Play();
        laserLine.enabled = true;

        yield return shotDuration;

        laserLine.enabled = false;
    }

    void ChangeMode()
    {
        if(Input.GetKeyDown(KeyCode.E))
        {
            AudioSource.PlayClipAtPoint(changeSound, transform.position);

            num = (num + 1) % modeTotalNum;
            gunAudio.clip = shotSounds[num];
            mr.material = materials[num];

            switch(num)
            {
                case 0:
                    mode = Mode.Normal;
                    break;
                case 1:
                    mode = Mode.ZeroGravity;
                    break;
                case 2:
                    mode = Mode.Gravity;
                    break;
            }
        }
    }
}

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

public class LockOn : MonoBehaviour
{
    public float lockRange = 50f;
    public Image aimImage;
    private Camera FPSCamera;
    private Color originalColor;

    void Start()
    {
        FPSCamera = GetComponent<Camera>();
        originalColor = aimImage.color;
    }

    void Update()
    {
        Vector3 rayOrigin = FPSCamera.ViewportToWorldPoint(new Vector3(0.5f, 0.5f, 0));
        RaycastHit hit;

        if(Physics.Raycast(rayOrigin, FPSCamera.transform.forward, out hit, lockRange))
        {
            string hitTag = hit.transform.gameObject.tag;

            // ★追加
            // （ポイント）「||」の意味を復習しよう！
            if(hitTag == "Target" || hitTag == "EnemyCore")
            {
                aimImage.color = new Color(1.0f, 0f, 0f, 1.0f);
            }
            else
            {
                aimImage.color = originalColor;
            }
        }
    }
}