统一游戏BreakOut球失去速度和方向

Question

我刚刚完成了一个BreakOut风格的游戏，但有一个错误，有时球被粘在地图的边缘，没有方向或速度，如屏幕截图所示。

我所看到的是，当球完全失去轨迹或速度，但不能解决错误时，就会发生这种情况。

在这里输入图像描述

我的代码

public class Ball : MonoBehaviour
{
    [SerializeField] Rigidbody2D rigidbody2D;
    Vector2 moveDirection;
    Vector2 currentVelocity;
     float velocity=10;
    //GameManager gameManager;
    Transform paddle;
    [SerializeField] AudioController audioController;
    [SerializeField] AudioClip bounceSfx;
    [SerializeField] AudioClip dieSfx;
    public bool superBall;
    [SerializeField] float superBallTime=10;
    [SerializeField]float yMinSpeed = 10;
    [SerializeField]TrailRenderer trailRenderer;

    public bool SuperBall
    {
        get=> superBall;
        set{
            superBall=value;
            if(superBall)
                StartCoroutine(ResetSuperBall());
        }
    }
    // Start is called before the first frame update
    void Start()
    {

        //rigidbody2D = GetComponent<Rigidbody2D>();
        //rigidbody2D.velocity = Vector2.up*velocity*Time.deltaTime;
        GameManager.Instance = FindObjectOfType<GameManager>();
        paddle = transform.parent;
    }
    // Update is called once per frame
    void Update()
    {
        currentVelocity = rigidbody2D.velocity;
        if (Mathf.Abs(currentVelocity.y) < 3 && Mathf.Abs(currentVelocity.y) < 3 && GameManager.Instance.ballOnGame)
        {
            velocity = 10;
            rigidbody2D.velocity = Vector2.up * velocity ;
        }
        if (Mathf.Abs(currentVelocity.y) + Mathf.Abs(currentVelocity.y) < 10 && GameManager.Instance.ballOnGame)
        {
            velocity = 10;
            rigidbody2D.velocity = Vector2.up * velocity ;
        }
        if  (velocity <10 && GameManager.Instance.ballOnGame)
        {
            velocity = 10;
            rigidbody2D.velocity = Vector2.up * velocity ;
        }

        if ((Input.GetKey(KeyCode.W) && GameManager.Instance.ballOnGame == false)||(Input.GetKey(KeyCode.Space) && GameManager.Instance.ballOnGame == false))
        {
            rigidbody2D.velocity = Vector2.up * velocity ;
            transform.parent = null;
            GameManager.Instance.ballOnGame = true;
            rigidbody2D.isKinematic = false;
            rigidbody2D.AddForce(new Vector3(velocity, velocity, 0));
            if (!GameManager.Instance.GameStarted)
            {
                GameManager.Instance.GameStarted = true;

            }
        }
    }
    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.transform.CompareTag("Brick") && superBall)
        {
            rigidbody2D.velocity = currentVelocity;
            return;
        }
        moveDirection=Vector2.Reflect(currentVelocity,collision.GetContact(0).normal);
        if (Mathf.Abs(moveDirection.y) < yMinSpeed)
        {
            //permitir velocidad minima
            moveDirection.y = yMinSpeed*Mathf.Sign(moveDirection.y);
        }
        rigidbody2D.velocity=moveDirection;

        audioController.PlaySfx(bounceSfx);

        if (collision.transform.CompareTag("BottomLimit"))
        {
            if(GameManager.Instance != null)
            {
                GameManager.Instance.PlayerLives--;
                audioController.PlayDie(dieSfx);
                if (GameManager.Instance.PlayerLives > 0)
                {
                    rigidbody2D.velocity = Vector2.zero;
                    transform.SetParent(paddle);
                    transform.localPosition = new Vector2(0, 0.65f);
                    GameManager.Instance.ballOnGame = false;
                }
                
            }
        }
    }
    IEnumerator ResetSuperBall()
    {
        trailRenderer.enabled = true;
        yield return new WaitForSeconds(superBallTime);
        trailRenderer.enabled = false;
        GameManager.Instance.powerIsActive = false;
        superBall = false;

    }

}

Answer 1

这是低速刚体常见的问题。物理引擎实现了一个Physics2D.velocityThreshold，它旨在抑制缓慢的反弹，并使一堆刚体平静下来。

velocityThreshold的默认值是1，这意味着速度较慢的x或y分量将被累加到0。

要解决此问题，只需将值降低到0.001。您可以在位于Edit->ProjectSettings->Physics2d的Physcs2d选项卡中执行此操作。