我是 C# 和 Unity 的新手,我已经阅读了整个论坛,但我仍然陷入困境。这是我收到的错误:
NullReferenceException:未将对象引用设置为对象的实例
ClickToMove.Update ()(位于 Assets/Scripts/ClickToMove.cs:27)
这就是我所拥有的...
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
public class ClickToMove : MonoBehaviour {
[Header("Stats")]
public float attackDistance;
public float attackRate;
private float nextAttack;
private NavMeshAgent navMeshAgent;
private Animator anim;
private Transform targetedEnemy;
private bool enemyClicked;
private bool walking;
void Awake ()
{
anim = GetComponent<Animator>();
navMeshAgent = GetComponent<NavMeshAgent>();
}
// Update is called once per frame
void Update ()
{
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
if (Input.GetButtonDown("Fire2"))
{
if (Physics.Raycast(ray, out hit, 1000))
{
if (hit.collider.tag == "Enemy")
{
targetedEnemy = hit.transform;
enemyClicked = true;
//print("Enemy Hit");
}
else
{
walking = true;
enemyClicked = false;
navMeshAgent.isStopped = false;
navMeshAgent.destination = hit.point;
}
}
}
if (enemyClicked)
{
MoveAndAttack();
}
if (navMeshAgent.remainingDistance <= navMeshAgent.stoppingDistance)
{
walking = false;
}
else
{
walking = true;
}
//anim.SetBool("isWalking", walking);
}
void MoveAndAttack()
{
if(targetedEnemy == null)
{
return;
}
navMeshAgent.destination = targetedEnemy.position;
if(navMeshAgent.remainingDistance > attackDistance)
{
navMeshAgent.isStopped = false;
walking = true;
}
else
{
transform.LookAt(targetedEnemy);
Vector3 dirToAttack = targetedEnemy.transform.position - transform.position;
if(Time.time > nextAttack)
{
nextAttack = Time.time + attackRate;
}
navMeshAgent.isStopped = true;
walking = false;
}
}
}
第 27 行以“Ray ray = Camera.main.ScreenPointToRay...”开头
您的场景中需要有一个相机MainCamera
标签以便调用Camera.main.ScreenPointToRay()
。没有这个,Camera.main
不存在,导致空引用异常。
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