[Unity] 플레이어와 발판이 같이 움직이게 만들기

Preview

https://youtu.be/B8_Z3RoIKCw

Trail은 참 쓰기 편하면서도, 보기 좋다 :)

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필요한 Script

• Player
• Ground Sensor
• Moving Platform

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Player

필요한 Component;

• Sprite Renderer
• Box Collider 2D : Friction & Bounciness가 모두 0인 Physical Material 2D가 필요하다. 플레이어가 벽에 달라붙지 않게 하기 위함이다.
• Rigidbody 2D : Body Type(Dynamic), Gravity Scale(6), Collision Detection(Continuous), Constrains(Freeze Rotation Z만 체크)
• Player(Script) : 하단 참조.

using UnityEngine;

public class Player : MonoBehaviour
{
    private Rigidbody2D rb;

    private float speed;
    private float vel_damp;
    private float jump_force;
    private Vector2 acc_direction;
    private bool is_grounded; public void SetIsGrounded(bool value) { is_grounded = value; }

    private void Awake()
    {
        GetReferences();
        InitFields();
    }

    private void GetReferences()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    private void InitFields()
    {
        speed = 125f;
        vel_damp = 0.75f;
        jump_force = 17.5f; 
        acc_direction = Vector2.zero;
        is_grounded = false;
    }

    private void FixedUpdate()
    {
        AdjustMovement();
    }

    private void AdjustMovement()
    {
        rb.linearVelocity += acc_direction * speed * Time.fixedDeltaTime;
        rb.linearVelocity = new Vector2(rb.linearVelocity.x * vel_damp, rb.linearVelocity.y);
    }

    private void Update()
    {
        Move();
        Jump();
    }

    private void Move()
    {
    	acc_direction = Vector2.zero;
        
        if (Input.GetKey(KeyCode.RightArrow)) acc_direction += Vector2.right;
        if (Input.GetKey(KeyCode.LeftArrow))  acc_direction += Vector2.left;
    }

    private void Jump()
    {
        if (Input.GetKeyDown(KeyCode.UpArrow) && is_grounded)
        {
            rb.linearVelocity = new Vector2(rb.linearVelocityX, jump_force);
        }
    }
}

 

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Ground Sensor

(Player GameObject의 Child여야 한다)

 

필요한 Component;

• Box Collider 2D : Is Trigger(체크)
• GroundSensor(Script) : 하단 참조.

using UnityEngine;

public class GroundSensor : MonoBehaviour
{
    private Player player;

    private void Awake()
    {
        GetReferences();
        //InitFields();
    }

    private void GetReferences()
    {
        player = GetComponentInParent<Player>();
    }

    private void OnTriggerEnter2D(Collider2D other)
    {
        if (other.tag == "Ground")
        {
            player.SetIsGrounded(true);
        }
    }

    // 매우 정확한 물리적-판정이 요구되는 게임에만 사용할 것.
    /*private void OnTriggerStay2D(Collider2D other)
    {
        if (other.tag == "Ground")
        {
            player_script.SetIsGrounded(true);
            return;
        }
    }*/

    private void OnTriggerExit2D(Collider2D other)
    {
        if (other.tag == "Ground")
        {
            player.SetIsGrounded(false);
        }
    }
}

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Moving Platform

(Tag : Ground)

 

필요한 Component;

• Sprite Renderer
• Box Collider 2D
• MovingPlatform(Script) : 하단 참조.

using UnityEngine;

public class MovingPlatform : MonoBehaviour
{
    private Rigidbody2D rb;

    private Vector2 destination;

    // prefab화를 통해 사용하기 위함.
    [SerializeField] private float speed;
    [SerializeField] private Vector2 start_pos, end_pos;

    private void Awake()
    {
        GetReferences();
        InitFields();
    }

    private void GetReferences()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    private void InitFields()
    {
        destination = end_pos;
    }

    private void Start()
    {
        transform.position = start_pos;
    }

    private void Update()
    {
        Move();
    }

    private void Move()
    {
        transform.Translate((destination - (Vector2)transform.position).normalized * speed * Time.deltaTime);

        if (Vector2.Distance(transform.position, destination) <= 0.125f)
        {
            if (destination == start_pos) { destination = end_pos; }
            else                          { destination = start_pos; }
        }
    }

    private void OnTriggerEnter2D(Collider2D other)
    {
        if (other.GetComponent<GroundSensor>())
        {
            other.transform.parent.transform.SetParent(transform);
        }
    }

    private void OnTriggerExit2D(Collider2D other)
    {
        if (other.GetComponent<GroundSensor>())
        {
            other.transform.parent.transform.SetParent(null);
        }
    }
}

 

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읽어주셔서 감사합니다!

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