Unity拾取物体脚本故障修复咨询：持有时物体不跟随手部、可无限触发投掷

嘿，我来帮你搞定这两个问题！咱们先拆解一下问题根源，再给你修复后的完整代码：

问题1：持有时物体不跟随手部 #

你的核心问题出在按键检测逻辑错误：原代码用了Input.GetKey(KeyCode.E)（按住E键才生效），而且在持有状态下，只要没按住E就会自动调用Drop()。这意味着你必须一直按住E才能拿住物体，松开就立刻掉落，自然没法让物体稳定跟随手部。

问题2：可无限触发投掷 #

原Throw()函数没有重置持有状态（isHolding没设为false，也没清空heldObject和heldRb），所以每次按F都会重复执行投掷逻辑，给物体持续加力，导致“无限扔”的情况。

修复后的完整代码 #

我把关键逻辑都调整好了，标注了修改点：

using TMPro;
using Unity.VisualScripting;
using UnityEngine;
using static UnityEngine.GraphicsBuffer;

public class PickUpObject : MonoBehaviour
{
    [Header("Pickup")]
    public Transform hand;
    public float pickupDistance = 3f;
    public LayerMask pickupMask;

    [Header("UI")]
    [Header("Throw")]
    public float throwForce = 8f; // Throw force
    public ForceMode throwForceMode = ForceMode.VelocityChange; // Add force immediately
    GameObject heldObject;
    Rigidbody heldRb;
    bool isHolding;

    void Update()
    {      
        // If holding something
        if (isHolding)
        {
            // 修改：用GetKeyDown（按下瞬间）触发放下，而不是松开E就自动放下
            if (Input.GetKeyDown(KeyCode.E))
                Drop();
            // 修改：用GetKeyDown确保投掷只触发一次，不是按住F就一直扔
            if (Input.GetKeyDown(KeyCode.F))
                Throw();
           
            return;
        }

        TryPickupRaycast();
    }

    void TryPickupRaycast()
    {
        RaycastHit hit;

        if (Physics.Raycast(
            Camera.main.transform.position,
            Camera.main.transform.forward,
            out hit,
            pickupDistance,
            pickupMask))
        {
            Rigidbody rb = hit.collider.GetComponent<Rigidbody>();

            if (rb != null)
            {                
                // 修改：用GetKeyDown（按下瞬间）触发拾取，不是按住E才拾取
                if (Input.GetKeyDown(KeyCode.E))
                {
                    PickUp(hit.collider.gameObject, rb);
                }
            }           
        }
    }


    void PickUp(GameObject obj, Rigidbody rb)
    {
        heldObject = obj;
        heldRb = rb;
        isHolding = true;

        heldRb.isKinematic = true;

        Collider col = obj.GetComponent<Collider>();
        if (col) col.enabled = false;

        obj.transform.SetParent(hand);
        obj.transform.localPosition = Vector3.zero;
        obj.transform.localRotation = Quaternion.identity;
    }

    public void Drop()
    {
        if (!isHolding) return;

        isHolding = false;

        heldRb.isKinematic = false;

        Collider col = heldObject.GetComponent<Collider>();
        if (col) col.enabled = true;

        heldObject.transform.SetParent(null);

        heldObject = null;
        heldRb = null;
    }

    void Throw()
    {
        if (!isHolding) return;

        // 修改：扔出前先启用碰撞体
        Collider col = heldObject.GetComponent<Collider>();
        if (col) col.enabled = true;

        // Unparent
        heldObject.transform.SetParent(null);

        // Reestablish the New Rigidbody Targetting
        if (heldObject != null) heldObject.SetActive(true);

        if (heldRb != null)
        {
            heldRb.isKinematic = false;

            // Throw force: at myHands.position.forward
            Vector3 dir = hand.forward;

            // restart speed and then addforce
            heldRb.linearVelocity = Vector3.zero;
            heldRb.angularVelocity = Vector3.zero;
            heldRb.AddForce(dir * throwForce, throwForceMode);
        }

        // 修改：清空持有状态，防止重复触发投掷
        isHolding = false;
        heldObject = null;
        heldRb = null;
    }

    // Used by SceneTransform
    public bool IsHolding() => isHolding;
    public GameObject GetHeldObject() => heldObject;
}

修复要点说明 #

1. 按键逻辑修正：把所有Input.GetKey改成Input.GetKeyDown，这样拾取、放下、投掷都是按下按键瞬间触发一次，符合正常操作逻辑。
2. 投掷状态重置：在Throw()函数末尾添加了持有状态的清空，确保扔出后不会重复执行投掷逻辑。
3. 碰撞体管理：在投掷时主动启用碰撞体，和Drop()保持一致，避免物体扔出后无法碰撞。

这样修改后，物体持有时会稳定跟随手部，按F只会投掷一次，不会无限触发啦！

备注：内容来源于stack exchange，提问作者idiotStackOverflow