Unity Button 滚动 3D 骰子寻找按钮上的 Rigidbody 而不是骰子对象

Question

我是 Unity 的新手，一直在尝试掷骰子。我遇到了一组教程，这些教程允许我创建一个 3d 模具（该模具使用 Rigidbody 和 Mesh Collider）并将其编写为在按下空格键时滚动的脚本，如下所示：

Dice.cs:

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

public class Dice : MonoBehaviour
{
    Rigidbody rb;

    bool hasLanded;
    bool thrown;

    Vector3 initPosition;
    
    public int diceValue;

    public DiceSide[] diceSides;


    // Start is called before the first frame update
    void Start()
    {
        rb = GetComponent<Rigidbody>();
        initPosition = transform.position;
        rb.useGravity = false;
    }

    // Update is called once per frame
    void Update()
    {
         if (Input.GetKeyDown(KeyCode.Space)){
            RollDice();
        }

        if (rb.IsSleeping() && !hasLanded && thrown)
        {
            hasLanded = true;
            rb.useGravity = false;
            rb.isKinematic = true;

            SideValueCheck();
        }
        else if (rb.IsSleeping() && hasLanded && diceValue == 0)
        {
            RollAgain();
        }
    }

    void RollDice()
    {
        if (!thrown && !hasLanded)
        {
            thrown = true;
            rb.useGravity = true;
            rb.AddTorque(Random.Range(0, 500), Random.Range(0,500), Random.Range(0, 500));
        }
        else if (thrown && hasLanded)
        {
            Reset();
        }
    }

    void Reset()
    {
        transform.position = initPosition;
        thrown = false;
        hasLanded = false;
        rb.useGravity = false;
        rb.isKinematic = false;
    }

    void RollAgain()
    {
        Reset();
        thrown = true;
        rb.useGravity = true;
        rb.AddTorque(Random.Range(0, 500), Random.Range(0, 500), Random.Range(0, 500));
    }

    void SideValueCheck()
    {
        diceValue = 0;
        foreach (DiceSide side in diceSides)
        {
            if (side.OnGround())
            {
                diceValue = side.sideValue;
                Debug.Log(diceValue + " has been rolled!");
            }
        }
    }
}

DiceSide.cs:

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

public class DiceSide : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        
    }

    bool onGround;
    public int sideValue;

    private void OnTriggerStay(Collider col)
    {
        if(col.tag == "Ground")
        {
            onGround = true;
        }
    }

    private void OnTriggerExit(Collider col)
    {
        if(col.tag == "Ground")
        {
            onGround = true;
        }
    }

    public bool OnGround()
    {
        return onGround;
    }
}

骰子的每一面都有一个球体，DiceSide.cs 附在球体上，包含与给定面相反的边值，Dice.cs 附在主骰子本身上。

以上所有都工作得很好。

我面临的问题是调整它而不是按下一个键（在这种情况下，空格键）我想在点击一个按钮后掷骰子。

为此，我修改了 Dice.cs 代码如下：

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

public class Dice : MonoBehaviour
{
    Rigidbody rb;

    bool hasLanded;
    bool thrown;

    Vector3 initPosition;

    public int diceValue;

    public DiceSide[] diceSides;


    // Start is called before the first frame update
    void Start()
    {
        rb = GetComponent<Rigidbody>();
        initPosition = transform.position;
        rb.useGravity = false;
    }

    // Update is called once per frame
    void Update()
    {
        if (rb.IsSleeping() && !hasLanded && thrown)
        {
            hasLanded = true;
            rb.useGravity = false;
            rb.isKinematic = true;

            SideValueCheck();
        }
        else if (rb.IsSleeping() && hasLanded && diceValue == 0)
        {
            RollAgain();
        }
    }

    public void RollDice()
    {
        if (!thrown && !hasLanded)
        {
            thrown = true;
            rb.useGravity = true;
            rb.AddTorque(Random.Range(0, 500), Random.Range(0,500), Random.Range(0, 500));
        }
        else if (thrown && hasLanded)
        {
            Reset();
        }
    }

    void Reset()
    {
        transform.position = initPosition;
        thrown = false;
        hasLanded = false;
        rb.useGravity = false;
        rb.isKinematic = false;
    }

    void RollAgain()
    {
        Reset();
        thrown = true;
        rb.useGravity = true;
        rb.AddTorque(Random.Range(0, 500), Random.Range(0, 500), Random.Range(0, 500));
    }

    void SideValueCheck()
    {
        diceValue = 0;
        foreach (DiceSide side in diceSides)
        {
            if (side.OnGround())
            {
                diceValue = side.sideValue;
                Debug.Log(diceValue + " has been rolled!");
            }
        }
    }
}

但是当我将Dice.cs脚本拖到按钮上时如下：

我收到 Unity 的错误提示

MissingComponentException: There is no 'Rigidbody' attached to the "Button-RollDice" game object, but a script is trying to access it. You probably need to add a Rigidbody to the game object "Button-RollDice". Or your script needs to check if the component is attached before using it. Dice.Update () (at Assets/Dice.cs:35)

我知道代码正在寻找按钮上的刚体而不是骰子，但我不知道如何修改我的代码以使其按预期作用于骰子。

谢谢。

Answer 1

骰子脚本仍需要位于 Dice 对象上。您需要一个带有 OnClick 事件的中间脚本来分配给带有对 Dice 脚本的引用的按钮，该脚本随后可以调用 RollDice。

类似于：


    public class ButtonHandler : MonoBehavior
    {
        // Assign dice game object to script in editor
        public GameObject DiceGameObject;
        private Dice dice;
    
        void Awake()
        {
            // Retrieve the script from the gameobject 
            dice = diceGameObject.GetComponent<Dice>();
        }
    
        public void RollDiceOnClick()
        {
            // Call the roll dice method
            dice.RollDice();
        }
    }

您可以将 RollDiceOnClick() 方法分配给按钮的 OnClick 事件（而不是 RollDice）。

然后将骰子游戏对象拖到 DiceGameObject 属性上，一切都应该 link 向上

Unity Button 滚动 3D 骰子寻找按钮上的 Rigidbody 而不是骰子对象

Unity Button to roll 3D dice looking for Rigidbody on the button instead of the die object

c#

unity3d

rigid-bodies