如何统一找到数组中第二近的对象？ [复制]答案

【问题标题】：How to find second closest object in array in unity? [duplicate]如何统一找到数组中第二近的对象？ [复制]
【发布时间】：2022-01-16 06:12:03
【问题描述】：

我在 Unity 中遇到问题。我想创建一个脚本，它能够找到离玩家最近的物体（我设法做到了）和离玩家第二近的物体。我的问题是如何修改此代码使其也适用于第二个对象？

public class Robot2 : MonoBehaviour
{
    public GameObject cameraHolder;
    public Transform[] objects;
    private Transform nearestObj;
    private Transform secondObj;
    void Update()
    {
        float lowestDist = Mathf.Infinity;
        nearestObj = null;
        secondObj = null;
    
        foreach(Transform obj in objects)
        {
            float dist = Vector3.Distance(transform.position, obj.position);
            if(dist < lowestDist)
            {
                lowestDist = dist;
                nearestObj = obj;
            }
        } 
        Debug.DrawLine(transform.position, nearestObj.transform.position, Color.red); 
        cameraHolder.transform.position = nearestObj.transform.position;
    }
}

【问题讨论】：

标签： c# unity3d

【解决方案1】：

您可以像下面的代码一样使用 LINQ：

Objects.ToList().OrderBy(o => Vector3.Distance(transform.position, o.position))[1]

或

Objects.ToList().OrderByDescending(o => Vector3.Distance(transform.position, o.position))[1]

【讨论】：

【解决方案2】：

你可以这样做：

float lowestDistance = Mathf.Infinity;
float nextLowestDistance = Mathf.Infinity;
nearestObject = null;
secondObject = null;

foreach ( Transform object in objects )
{
    float dist = Vector3.Distance( object.position, transform.position );
    if ( dist < lowestDistance )
    {
        if ( lowestDistance < nextLowestDistance )
        {
            nextLowestDistance = lowestDistance;
            secondObject = nearestObject;
        }
        lowestDistance = dist;
        nearestObject = object;
    }
    else if ( dist < nextLowestDistance )
    {
       nextLowestDistance = dist;
       secondObject = object;
    }
}

【讨论】：