如何从 spherecast 中获取最近的 object？

Question

我正在使用 Grab Object 脚本来抓取触发对撞机内的 object。 但是，当我尝试在对撞机内抓取 object 时，它会同时抓取所有对象（示例图像同时抓取两块砖）。

我需要一个规则来只抓取最近的 object。

两块砖被抓住

我正在使用此脚本来抓取对象。 在 YT 教程上找到它并对其进行了调整

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

public class PickUp : MonoBehaviour {

    
    public float throwForce = 100;

    public bool canHold = true;
    public GameObject item;
    public GameObject tempParent;
    public GameObject poof;
    public GameObject vanish;
    public GameObject poofParent;
    public Transform guide;
    public bool isHolding = false;
    
    float distance;

 // Use this for initialization
 void Start () {
         
 }
 
 // Update is called once per frame
 void Update () {

        distance = Vector3.Distance(item.transform.position, guide.transform.position);

        if (Input.GetKeyDown("space"))
        
        if (distance <= 6f)
        {
            isHolding = true;
            item.transform.position = tempParent.transform.position;
            
            //Poof
            GameObject myPoof = Instantiate(poof, Vector3.zero, Quaternion.identity) as GameObject;
            myPoof.transform.parent = poofParent.transform;
            myPoof.transform.position = poofParent.transform.position;
            Destroy (myPoof, 2);
            
            //Particles
            GameObject myVanish = Instantiate(vanish, Vector3.zero, Quaternion.identity) as GameObject;
            myVanish.transform.parent = tempParent.transform;
            myVanish.transform.position = tempParent.transform.position;
            Destroy (myVanish, 4);
        }

        if (isHolding==true)
        {
            
            item.GetComponent<Rigidbody>().useGravity = false;
            item.GetComponent<Rigidbody>().detectCollisions = true;
            item.GetComponent<Rigidbody>().isKinematic = false;
            item.transform.parent = tempParent.transform;
            item.transform.position = tempParent.transform.position;
            if (Input.GetKeyUp("space"))
            {
                Debug.Log("Trying to throw");
                item.GetComponent<Rigidbody>().AddForce(guide.transform.forward * throwForce);
                isHolding = false;
            }
        }
        else
        {
            item.GetComponent<Rigidbody>().useGravity = true;
            item.GetComponent<Rigidbody>().isKinematic = false;
            item.transform.parent = null;
        }
 }

}

Answer 1

在 Unity 的物理系统中实现了一个球体投射，但它的存在是为了不同的目的。 相反，您正在寻找Physics.OverlapSphere

假设您的guide object 应该是球体的中心，您可以确定指定选择半径中最近的 object ( closestSelectedObject )。

float radiusOfSphere;
float smallesDistance;
Transform closestSelectedObject;
/***/

void Update(){
  if(Input.GetKeyDown("space")){
    Collider[] hitColliders = Physics.OverlapSphere(guide.transform.position, radiusOfSphere);
    if(hitColliders.length > 0){
      smallesDistance = radiusOfSphere;
      foreach(Collider obj in hitColliders){
        float tempDistance = Vector3.Distance(obj.transform.position, guide.transform.position);
        if(tempDistance <= smallesDistance){
          smallesDistance = tempDistance;
          closestSelectedObject = obj;
        }
      }
      /*other stuff that your code does*/
    }
  }
}

Answer 2

没有你的帮助@derHugo，我的最终功能（更新）代码无法完成，谢谢！

void Update () {

    Collider[] hitColliders = Physics.OverlapSphere(guide.transform.position, radiusOfSphere);
    var closestSelectedObject = hitColliders.OrderBy(obj => (obj.transform.position - guide.transform.position). sqrMagnitude).FirstOrDefault();
    
    GameObject grabbed = GameObject.Find("grabbedObject");

    if (grabbed != null)
    {
    Debug.Log("existe");
    if (Input.GetKeyDown(KeyCode.Space) && !spaceDisabled) {
    spaceDisabled = true;
    }
    }

    else
    {

        if (Input.GetKeyDown("space"))
        {

            // targetObject does not exist in the scene
            Debug.Log("NAOexiste");

                if (closestSelectedObject.tag.Contains("CanPickup"))
                {

                closestSelectedObject.transform.position = tempParent.transform.position;
                closestSelectedObject.transform.parent = tempParent.transform;
                closestSelectedObject.GetComponent<Rigidbody>().detectCollisions = false;
                closestSelectedObject.GetComponent<Rigidbody>().isKinematic = true;
                closestSelectedObject.GetComponent<Rigidbody>().useGravity = true;

                originalName = closestSelectedObject.name;
                closestSelectedObject.name = "grabbedObject";
                
                //Poof
                GameObject myPoof = Instantiate(poof, Vector3.zero, Quaternion.identity) as GameObject;
                myPoof.transform.parent = poofParent.transform;
                myPoof.transform.position = poofParent.transform.position;
                Destroy (myPoof, 2);
                
                //Particles
                GameObject myVanish = Instantiate(vanish, Vector3.zero, Quaternion.identity) as GameObject;
                myVanish.transform.parent = tempParent.transform;
                myVanish.transform.position = tempParent.transform.position;
                Destroy (myVanish, 4);
                }
            }
    }

    if (Input.GetKeyDown(KeyCode.Q))
                {
                Debug.Log("Q key was pressed.");
                
                grabbed.transform.parent = null;
                grabbed.GetComponent<Rigidbody>().detectCollisions = true;
                grabbed.GetComponent<Rigidbody>().isKinematic = false;
                grabbed.GetComponent<Rigidbody>().useGravity = true;
                grabbed.GetComponent<Rigidbody>().AddForce(guide.transform.forward * throwForce);          
                
                Input.ResetInputAxes();

                grabbed.name = originalName;
                
            }

    }