坠落重生

Question

我正在使用 Unity 制作平台游戏，并使用 C# 进行编程。我有一个 Ball Control 脚本，它处理输入和其连续弹跳背后的物理特性。我还有一个 BounceTrigger 脚本，它可以让球停下来，然后让它再次反弹。我试图用玩家实现重生应该是在他反弹过来的最后一个不可破坏的平台上重生。

控球脚本 公共浮动速度 = 2;

bool alreadyBounced;
bool boost;
float boostMultiplier;
Vector3 boostVelocityAdd;

int fallY = 10;
BounceTrigger platform;

// Update is called once per frame
void Update () 
{
    alreadyBounced = false;

    float appliedVelocity = velocity * (boost ? boostMultiplier : 1);
    Vector3 direction = Vector3.zero;

    if(Input.GetKeyDown(KeyCode.LeftArrow) || Input.GetKeyDown(KeyCode.A)) { direction = Vector3.left; rigidbody.AddForce(direction * appliedVelocity, ForceMode.VelocityChange);}
    if(Input.GetKeyDown(KeyCode.RightArrow) || Input.GetKeyDown(KeyCode.D)) { direction = Vector3.right; rigidbody.AddForce(direction * appliedVelocity, ForceMode.VelocityChange);}
    if(Input.GetKeyDown(KeyCode.UpArrow) || Input.GetKeyDown(KeyCode.W)) { direction = Vector3.forward; rigidbody.AddForce(direction * appliedVelocity, ForceMode.VelocityChange);}
    if(Input.GetKeyDown(KeyCode.DownArrow) || Input.GetKeyDown(KeyCode.S)) { direction = -Vector3.forward; rigidbody.AddForce(direction * appliedVelocity, ForceMode.VelocityChange); }

    if(Input.GetKeyUp(KeyCode.LeftArrow) || Input.GetKeyUp(KeyCode.A)) { direction = -Vector3.left; rigidbody.AddForce(direction * appliedVelocity, ForceMode.VelocityChange); }
    if(Input.GetKeyUp(KeyCode.RightArrow) || Input.GetKeyUp(KeyCode.D)){ direction = -Vector3.right; rigidbody.AddForce(direction * appliedVelocity, ForceMode.VelocityChange); }
    if(Input.GetKeyUp(KeyCode.UpArrow) || Input.GetKeyUp(KeyCode.W)) { direction = -Vector3.forward; rigidbody.AddForce(direction * appliedVelocity, ForceMode.VelocityChange); }
    if(Input.GetKeyUp(KeyCode.DownArrow) || Input.GetKeyUp(KeyCode.S)) { direction = Vector3.forward; rigidbody.AddForce(direction * appliedVelocity, ForceMode.VelocityChange); }
    CheckFalling ();
}

public void CheckFalling(){
    if(this.transform.position.y < fallY){
        Respawn();
    }
}

public void Respawn(){
    this.transform.position = lastPlatform.transform.position + Vector3.up;
}



public void Bounce(BounceTrigger platform, float upVelocity) {

    var reboteGO = (GameObject) GameObject.FindWithTag ("TextoRebote");
    var reboteComp = reboteGO.GetComponent<BounceCounter>();

    if(!alreadyBounced)
    {
        if(!platform.isDestructible){
            lastPlatform = platform;
        }

        Debug.Log("Bounce");
        alreadyBounced = true;
        reboteComp.AumentarRebote();
        float downVelocity = rigidbody.velocity.y;
        rigidbody.AddForce(Vector3.up * (-downVelocity + upVelocity), ForceMode.VelocityChange);
        ResetBoost();
    }
}

public void Boost(float multiplier){
    if(!boost){
        Debug.Log("Boost");
        StartCoroutine(BoostCoroutine(multiplier));
    }
}

public void ResetBoost(){
    if(boost){
        Debug.Log("Reset boost");
        boost = false;
        Vector3 velocityAdd = rigidbody.velocity;
        velocityAdd.x = velocityAdd.x / boostMultiplier * (boostMultiplier - 1);
        velocityAdd.z = velocityAdd.z / boostMultiplier * (boostMultiplier - 1);
        velocityAdd.y = 0;
        rigidbody.AddForce(-velocityAdd, ForceMode.VelocityChange);
    }
}

public void RestarVida(){
    var vidaGO = (GameObject) GameObject.FindWithTag ("TextoVida");
    var vidaComp = vidaGO.GetComponent<LifeCounter>();
    vidaComp.RestarVida ();
}

IEnumerator BoostCoroutine(float multiplier){
    yield return 0;
    yield return new WaitForFixedUpdate();
    boost = true;
    boostMultiplier = multiplier;
    Vector3 velocityAdd = rigidbody.velocity;
    Debug.Log(velocityAdd);
    velocityAdd.x = velocityAdd.x * (boostMultiplier - 1);
    velocityAdd.z = velocityAdd.z * (boostMultiplier - 1);
    velocityAdd.y = 0;
    rigidbody.AddForce(velocityAdd, ForceMode.VelocityChange);
    Debug.Log(velocityAdd);
}

弹跳触发脚本： ` 公共浮动 upVelocity = 10;

public bool isDestructible = false;

public virtual void OnTriggerEnter(Collider collider){
    collider.GetComponent<BallControl>().Bounce(this, upVelocity);
}

当我编译这个时，我得到一个 nullReferenceException `

Answer 1

您有一个全局变量 BounceTrigger platform; 而不是 BounceTrigger lastPlatform;，因此 lastPlatform 在您的代码中的任何位置都不存在。