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c# - 如何为 Unity 3D 修复此脚本

问题描述

该脚本应该允许我的第一人称控制器/播放器上到一个对象，按 E 键，然后拾取并携带该对象。脚本中有错误，我还不明白如何编程。我还附上了代码中错误的屏幕截图以供参考。

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

public class PickupObject : MonoBehaviour
{
    GameObject mainCamera;
    bool carrying;
    GameObject carriedObject;
    public float distance;
    public float smooth;
    // Start is called before the first frame update
    void Start()
    {
        mainCamera = GameObject.FindWithTag("MainCamera");
    }

    // Update is called once per frame
    void Update()
    {
        if (carrying)
        {
            carry(carriedObject);
            checkDrop();
        }
        else
        {
            pickup();
        }
    }

    void carry(GameObject o)
    {
        o.GetComponent<Rigidbody>().isKinematic = true;
        o.transform.position = Vector3.Lerp (mainCamera.transform.position + mainCamera.transform.forward * distance, Time.deltaTime * smooth);
    }

    void pickup() 
    {
        if (Input.GetKeyDown KeyCode.E;))
        {
            int x = Screen.width / 2;
            int y = Screen.height / 2;
        }

        Ray ray = mainCamera.GetComponent<Camera>().ScreentPointToRay(new Vector3(x, y));
        RaycastHit hit;
        if(Physics.Raycast(ray, out hit))
        {
            Pickupable p = hit.collider.GetComponent<Pickupable>();
            if(p != null)
            {
                carrying = true;
                carriedObject = p.gameObject;
                p.gameObject.rigidbody.isKinematic = true;
            }
        }
    }
}

void checkDrop()
{
    if(Input.GetKeyDown(KeyCode.E))
    {
        dropObject();
    }
    void dropObject()
    {
        carrying = false;
        carriedObject = null;
        carriedObject.gameObject.rigidbody.isKinematic = false;
    }
}

}

在此处输入图像描述

标签： c#unity3dgame-development

解决方案

在pickup您定义的块内和int x块内。int yif

第二个问题是在方法之内（或之后）pickup你有一个}接近很多的方法。

if (Input.GetKeyDown KeyCode.E;))
{
    int x = Screen.width / 2;
    int y = Screen.height / 2;
} // <-- SEEMS THAT THIS HERE IS YOUR PROBLEM !

所以你基本上在方法之前结束你的课程checkDrop。其余的只是后续错误：xandy将仅在此代码块中以及稍后尝试在其中使用它们时才知道

Ray ray = mainCamera.GetComponent<Camera>().ScreentPointToRay(new Vector3(x, y));

它们不存在。

也正如您和班级所说，该方法checkDrop在Update. 然后你会得到一些额外的错误，因为不允许在类型之外定义方法。

请注意，我格式化了您的代码，所以现在应该很清楚了。你可能更希望它做

void pickup() 
{
    if (Input.GetKeyDown KeyCode.E;))
    {
        int x = Screen.width / 2;
        int y = Screen.height / 2;
    
        Ray ray = mainCamera.GetComponent<Camera>().ScreentPointToRay(new Vector3(x, y));
        RaycastHit hit;
        if(Physics.Raycast(ray, out hit))
        {
            Pickupable p = hit.collider.GetComponent<Pickupable>();
            if(p != null)
            {
                carrying = true;
                carriedObject = p.gameObject;
                p.gameObject.rigidbody.isKinematic = true;
            }
        }
    }
}

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