Unity骰子游戏Alpha1/Alpha2按键触发异常问题求助

问题描述 #

开发Unity骰子游戏时遇到三个异常：

• 双击Alpha1键时骰子出现“双跳”，StopDiceMovement()似乎未生效
• 偶尔骰子从初始静止位置而非随机投掷位置发射
• 按下Alpha2键时骰子仅停止运动，无法回到初始位置

核心问题脚本如下：

using System.Collections.Generic;
using UnityEngine;

public class BoardController : MonoBehaviour
{
    #region VAR
    [SerializeField] private List<Transform> diceRestPositions = new List<Transform>();
    [SerializeField] private List<Transform> dices = new List<Transform>();
    [SerializeField] private Transform throwPosition;
    [SerializeField] private float throwRange;
    #endregion

    #region MONO
    private void Update()
    {
        LaunchDices();
        if(Input.GetKeyDown(KeyCode.Alpha2))
        {
            ResetDicesPos();
        }
    }
    private void Start()
    {
        
    }
    #endregion

    #region CUSTOM
 
    private Vector3 GetRandomThrowPos()
    {
        return new Vector3(Random.Range(throwPosition.position.x- throwRange, throwPosition.position.x + throwRange), 1.2f, Random.Range(throwPosition.position.z - throwRange, throwPosition.position.z + throwRange));
    }

    private void ResetDicesPos()
    {
        StopDiceMovement();
        for (int i = 0; i < diceRestPositions.Count; i++)
        {
            dices[i].position = diceRestPositions[i].localPosition;
            dices[i].rotation = diceRestPositions[i].localRotation;
        }
    }
    private void StopDiceMovement()
    {
        foreach(Transform dice in dices)
        {
            if(dice.TryGetComponent<Rigidbody>(out Rigidbody rb))
            {
                rb.velocity = Vector3.zero;
                dice.rotation = Quaternion.identity;
                rb.angularVelocity = Vector3.zero;
            }
        }
    }
    private void LaunchDices()
    {
        if(Input.GetKeyDown(KeyCode.Alpha1)) 
        {
            StopDiceMovement();
            foreach (Transform dice in dices)
            {
                dice.position = GetRandomThrowPos();
                if(dice.TryGetComponent<DiceAddForce>(out DiceAddForce comp))
                {
                    comp.ApplyRandomForce();
                }
            }
        }
        
    }
    #endregion    
}

问题根源分析 #

1. 双击Alpha1的双跳问题：

   • LaunchDices()在Update()每帧调用，双击时两次Input.GetKeyDown(KeyCode.Alpha1)都会触发，StopDiceMovement()仅重置速度，未阻止重复施加力，导致双跳。
   • 直接修改dice.position后立刻加力，物理引擎可能未同步位置，导致力的作用位置异常。

2. 骰子从初始位置发射：

   • 骰子运动时，StopDiceMovement()直接设置dice.rotation = Quaternion.identity，未等物理引擎确认状态就设置位置，可能被物理引擎的碰撞或状态回滚覆盖。

3. Alpha2无法回到初始位置：

   • ResetDicesPos()使用diceRestPositions[i].localPosition（本地坐标）赋值给dices[i].position（世界坐标），若diceRestPositions父物体非世界原点，坐标会完全错误。

修复后的代码 #

using System.Collections.Generic;
using UnityEngine;

public class BoardController : MonoBehaviour
{
    #region VAR
    [SerializeField] private List<Transform> diceRestPositions = new List<Transform>();
    [SerializeField] private List<Transform> dices = new List<Transform>();
    [SerializeField] private Transform throwPosition;
    [SerializeField] private float throwRange;
    // 标记是否正在处理投掷，防止重复触发
    private bool isThrowing = false;
    #endregion

    #region MONO
    private void Update()
    {
        if(Input.GetKeyDown(KeyCode.Alpha1) && !isThrowing)
        {
            LaunchDices();
        }
        if(Input.GetKeyDown(KeyCode.Alpha2))
        {
            ResetDicesPos();
        }
    }
    #endregion

    #region CUSTOM
 
    private Vector3 GetRandomThrowPos()
    {
        return new Vector3(Random.Range(throwPosition.position.x - throwRange, throwPosition.position.x + throwRange), 
                          1.2f, 
                          Random.Range(throwPosition.position.z - throwRange, throwPosition.position.z + throwRange));
    }

    private void ResetDicesPos()
    {
        StopDiceMovement();
        for (int i = 0; i < diceRestPositions.Count; i++)
        {
            // 使用世界坐标而非本地坐标
            dices[i].position = diceRestPositions[i].position;
            dices[i].rotation = diceRestPositions[i].rotation;
        }
    }

    private void StopDiceMovement()
    {
        foreach(Transform dice in dices)
        {
            if(dice.TryGetComponent<Rigidbody>(out Rigidbody rb))
            {
                // 先设置刚体为运动学，避免物理引擎干扰位置设置
                rb.isKinematic = true;
                rb.velocity = Vector3.zero;
                rb.angularVelocity = Vector3.zero;
            }
        }
    }

    private void LaunchDices()
    {
        isThrowing = true;
        StopDiceMovement();
        foreach (Transform dice in dices)
        {
            if(dice.TryGetComponent<Rigidbody>(out Rigidbody rb))
            {
                // 恢复动力学状态，允许物理模拟
                rb.isKinematic = false;
            }
            dice.position = GetRandomThrowPos();
            if(dice.TryGetComponent<DiceAddForce>(out DiceAddForce comp))
            {
                comp.ApplyRandomForce();
            }
        }
        // 延迟标记投掷结束，防止快速双击触发
        Invoke(nameof(ResetThrowingFlag), 0.1f);
    }

    private void ResetThrowingFlag()
    {
        isThrowing = false;
    }
    #endregion    
}

关键修复点说明 #

• 防止重复触发：添加isThrowing标记，配合Invoke延迟重置，避免双击Alpha1时重复执行投掷逻辑。
• 坐标系统修正：ResetDicesPos()中改用diceRestPositions[i].position（世界坐标）设置骰子位置，解决无法回到初始位置的问题。
• 刚体状态控制：StopDiceMovement()中先将刚体设为运动学（isKinematic = true），避免物理引擎干扰位置和旋转的设置；投掷前恢复动力学状态，确保力能正常作用。
• 移除错误旋转设置：删除StopDiceMovement()中dice.rotation = Quaternion.identity的硬编码，改用初始位置的旋转，避免干扰后续位置设置。

内容的提问来源于stack exchange，提问作者Wiktor Mazurkiewicz