Question

我在Unity 3D中开发FPS游戏时遇到错误

NullReferenceException：对象引用未设置为的实例对象Node.OnDrawGizmos（）（在Assets / Node.cs：14）

它工作得很好但是当我向节点添加了图层时，我收到了这个错误。

查看完整的代码

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

public class Node : MonoBehaviour {

public List<GameObject> neighours = new List<GameObject>();

public float nodeRadius = 50.0f;
public LayerMask nodeLayerMask;
public LayerMask collisionLayerMask;

public GameObject goal;

void OnDrawGizmos() {

    Gizmos.DrawWireCube(transform.position, Vector3.one);

    foreach(GameObject neighbor in neighbors) {

        Gizmos.DrawLine(transform.position, neighbor.transform.position);
        Gizmos.DrawWireSphere(neighbor.transform.position, 0.25f);
    }

    if(goal) {

        GameObject current = gameObject;
        Stack<GameObject> path = DijkstraAlgorithm.Dijkstra(GameObject.FindGameObjectsWithTag("Node"), gameObject, goal);

        foreach(GameObject obj in path) {

            Gizmos.DrawSphere(obj.transform.position, 1.0f);
            Gizmos.color = Color.green;
            Gizmos.DrawLine(current.transform.position, obj.transform.position);
            current = obj;
        }
    }
}

[ContextMenu ("Connect Node to Neighours")]
void findNeighours() {

    neighours.Clear();
    Collider[] cols = Physics.OverlapSphere(transform.position, nodeRadius, nodeLayerMask);

    foreach(Collider node in cols) {

        if(node.gameObject != gameObject) {


        }
    }
}

}

Answer 1

我看到findNeighours没有提供neighours，所以我想你想要这样的东西：

foreach (Collider node in cols) {
    if (node.gameObject != gameObject)
        neighours.Add (node.gameObject);
}

关于OnDrawGizmos，可能path和neighours可能持有null项。您应该检查是否是这种情况，并查看它为什么填充它null。请注意，可能删除场景中的GameObject（而不是使用findNeighours刷新）可能会使其保留null引用。

检查您是否已定义goal。

注意：通过邻居你的意思是邻居？

我在Unity3D中出现此错误 - NullReferenceException：对象引用未设置为对象的实例

1 个答案: