유니티 Instantiate 위치 - yuniti Instantiate wichi

- Instantiate(GameObject original) : original 게임오브젝트(프리팹)를 복제해서 생성 (복제되는 오브젝트의 모든 컴포넌트 정보가 원본과 완전히 동일)
- Instantiate(GameObject original, Vector3 position, Quaternion rotation) : 
original 게임오브젝트(프리팹)을 복제해서 생성하고, 생성된 복제본의 위치를 position으로, 회전을 rotation으로 설정
- GameObject clone = Instantiate(GameObject original, Vector3 position, Quaternion rotation) :
생성된 복제 오브젝트의 정보를 clone에 저장, clone과 오브젝트의 정보는 동일, clone의 정보가 바뀌면 Hierachy View에 생성되 오브젝트의 정보가 바뀜

// PlayerController.cs

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

public class PlayerController : MonoBehaviour
{

       [SerializeField]
    private KeyCode         keyCodeFire = KeyCode.Space;    // spacebar 키
    [SerializeField]
    private GameObject      bulletPrefab;        // 총알 오브젝트
    private float           moveSpeed = 5.0f;     // 플레이어 이동속도
    private Vector3         lastMoveDirection = Vector3.right;  // 마지막에 움직였던 방향을 저장, 처음엔 오른쪽으로 초기화

    // 새로운 위치 = 현재 위치 + (방향 * 속도)
    private void Update() {

        // Negative left,  a : -1
        // Positive right, d : +1
        // Non : 0
        float x = Input.GetAxisRaw("Horizontal");       // 좌우 이동
        // Negative down,  s : -1
        // Positive up, w : +1
        // Non : 0
        float y = Input.GetAxisRaw("Vertical");         // 위아래 이동

               // 이동 방향 이동
        transform.position += new Vector3(x, y, 0) * moveSpeed * Time.deltaTime;

        // 플레이어 이동 방향키를 입력 받으면 lastMoveDirection에 저장
        if(x != 0 || y != 0)
        {
            lastMoveDirection = new Vector3(x, y, 0);
        }

        // 플레이어 오브젝트 총알 발사
        // 스페이스바를 입력받으면 slimeBall 오브젝트 발사
        if(Input.GetKeyDown(keyCodeFire))
        {
            // bulletPrefab 오브젝트 생성, 생성되는 위치는 이 게임오브젝트의 위치(플레이어),
            GameObject clone = Instantiate(bulletPrefab, transform.position, Quaternion.identity);

            clone.name = "Bullet";  // 생성한 오브젝트의 이름
            clone.transform.localScale = Vector3.one;

clone.GetComponent<Movement2D>().Setup(lastMoveDirection);
            // clone.GetComponent<SpriteRenderer>().color = Color.red;
        }

    }
}

// Movement2D.cs

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

public class Movement2D : MonoBehaviour
{
    private float moveSpeed = 15.0f;
    private Vector3 moveDirection;

    public void Setup(Vector3 direction)
    {
        moveDirection = direction;
    }

    // Update is called once per frame
    void Update()
    {
        transform.position += moveDirection * moveSpeed * Time.deltaTime;
    }
}