[3D] Raycast 활용하기(Ray, RaycastHit,Instantiate)

* RaycastHit : raycast로부터 정보를 얻기 위해 사용되는 구조체를 나타냄

 

* Physics.Raycast : bool 형식으로 어떤 콜라이더와 레이가 충돌했으면 true, 아니면 false

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

public class ExampleClass : MonoBehaviour
{
    private void FixedUpdate()
    {
        Vector3 fwd = transform.TransformDirection(Vector3.forward);

        if (Physics.Raycast(transform.position, fwd, 10))
            print("There is something in front of the object");
    }
}

* Instantiate

Object.Instantiate

public static Object Instantiate(Object original);

public static Object Instantiate(Object original, Vector3 position, Quaternion rotation);

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

public class ExampleClass : MonoBehaviour
{
    public GameObject prefab;

    private void Start()
    {
        for (int i = 0; i < 10; i++)
            Instantiate(prefab, new Vector3(i * 2.0f, 0, 0), Quaternion.identity);
    }
}

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

public class ExampleClass : MonoBehaviour
{
    //Instantiate a prefab with an attached Missile script
    public Missile missilePrefab;

    private void Start()
    {
        //Instantiate the missile at the position and rotation of this object's transform
        missilePrefab clone = (Missile)Instantiate(missilePrefab, transform.position, transform.rotation);
    }
}

 

 

[MainScript]

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

public class GameSystemManager : MonoBehaviour
{

    private Vector3 movePos;
    
    //Raycast
    private Ray ray;
    private RaycastHit hitInfo;


    [SerializeField]
    private GameObject tree;


    private void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            CallTargetPos();
        }
    }

    void CallTargetPos()
    {
        ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        Debug.DrawRay(ray.origin, ray.direction * 10, Color.red, 1f);
        if (Physics.Raycast(ray, out hitInfo))
        {
            movePos = hitInfo.point;
            
            //Pond 색 바꾸기
            if(hitInfo.transform.tag == "Pond")
            {
                hitInfo.transform.GetComponent<MeshRenderer>().material.color = Color.blue;
            }
            
            //Ground에 나무 심기
            if(hitInfo.transform.tag == "Ground")
            {
                Instantiate(tree, movePos, Quaternion.identity);
            }

			//DestroyObj 삭제하기
            if(hitInfo.transform.tag == "DestroyObj")
            {
                Destroy(hitInfo.transform.gameObject);
            }
        }
    }
}