Camera.main null reference exception - c#

I am new to C# and Unity and I have read this entire forum and I am still stuck. This is the error I am getting:
NullReferenceException: Object reference not set to an instance of an object
ClickToMove.Update () (at Assets/Scripts/ClickToMove.cs:27)
This is what I have...
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;
}
}
}
Line 27 starts with "Ray ray = Camera.main.ScreenPointToRay..."

You need to have a camera in your scene with the MainCamera tag in order to call Camera.main.ScreenPointToRay(). Without this, Camera.main does not exist, resulting in a null reference exception.

Related

NavMeshAgent missing remainingDistance in Unity

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("Nailed em");
}
else
{
walking = true;
enemyClicked = false;
navMeshAgent.isStopped = false;
navMeshAgent.destination = hit.point;
}
}
}
if (enemyClicked)
{
MoveAndAttack();
}
--> if (navMeshAgent.remaingDistance <= 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;
}
}
The line of code with --> is my main problem. I am new to unity and coding, so yes feel free to school me please.
'NavMeshAgent' does not contain a definition for 'remaingDistance' and no accessible extension method 'remaingDistance' accepting a first argument of type 'NavMeshAgent' could be found (are you missing a using directive or an assembly reference?).
I understand the console tells me the problem, I just have no idea how to fix it.

How do I call a method which is in another class, when swiping up, down, left or right? Unity2D

I have a Unity project that I started a couple of days ago. It is a simple 2D top down shooting game, which is aimed to be played on smartphone platforms.
I have a Shooting script, which basically has a method called Shoot1, which spawns in a bullet.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Shooting : MonoBehaviour
{
public Transform firePoint;
public GameObject BulletRedPrefab;
public GameObject BulletGreenPrefab;
public float bulletForce = 20f;
// Update is called once per frame
void Start()
{
}
void Update()
{
}
public IEnumerator Shoot1()
{
yield return new WaitForSeconds(0.00001f);
GameObject bullet = Instantiate(BulletRedPrefab, firePoint.position, firePoint.rotation);
Rigidbody2D rb = bullet.GetComponent<Rigidbody2D>();
rb.AddForce(firePoint.up * bulletForce, ForceMode2D.Impulse);
}
}
I also have the Swipe script which determines the direction of the swipe, etc.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Swipe : MonoBehaviour
{
private bool tap, swipeUp, swipeDown, swipeLeft, swipeRight;
private bool isDraging = false;
private Vector2 startTouch, swipeDelta;
// Update is called once per frame
private void Update()
{
tap = swipeUp = swipeDown = swipeLeft = swipeRight = false;
if (Input.touches.Length > 0)
{
if (Input.touches[0].phase == TouchPhase.Began)
{
isDraging = true;
tap = true;
startTouch = Input.touches[0].position;
}
else if (Input.touches[0].phase == TouchPhase.Ended || Input.touches[0].phase == TouchPhase.Canceled)
{
isDraging = false;
Reset();
}
}
if (Input.GetMouseButtonDown(0))
{
tap = true;
isDraging = true;
startTouch = Input.mousePosition;
}
else if (Input.GetMouseButtonUp(0))
{
isDraging = false;
Reset();
}
swipeDelta = Vector2.zero;
if (isDraging)
{
if (Input.touches.Length > 0)
swipeDelta = Input.touches[0].position - startTouch;
else if (Input.GetMouseButton(0))
swipeDelta = (Vector2)Input.mousePosition - startTouch;
}
if (swipeDelta.magnitude > 125)
{
float x = swipeDelta.x;
float y = swipeDelta.y;
if (Mathf.Abs(x) > Mathf.Abs(y))
{
if (x < 0)
swipeLeft = true;
else
swipeRight = true;
}
else
{
if (y < 0)
swipeDown = true;
else
swipeUp = true;
}
Reset();
}
}
private void Reset()
{
startTouch = swipeDelta = Vector2.zero;
isDraging = false;
}
public Vector2 SwipeDelta { get { return swipeDelta; } }
public bool SwipeUp { get { return swipeUp; } }
public bool SwipeDown { get { return swipeDown; } }
public bool SwipeLeft { get { return swipeLeft; } }
public bool SwipeRight { get { return swipeRight; } }
}
And I have the GestureDetector script which is aimed to shoot a bullet whenever the user swipes left, right, up or down. When I tried to make the player object (which is called robot) move via swiping, it worked. But when I try calling a method from another class with swiping, it's not working.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class GestrueDetector : MonoBehaviour
{
public Shooting other;
public Swipe swipeControls;
// Start is called before the first frame update
void Start()
{
}
// Update is called once per frame
private void Update()
{
if (GameObject.Find("robot") != null)
{
if (swipeControls.SwipeLeft)
desirePosition += Vector3.left;
other.Shoot1();
if (swipeControls.SwipeRight)
desirePosition += Vector3.right;
other.Shoot1();
if (swipeControls.SwipeUp)
desirePosition += Vector3.up;
other.Shoot1();
if (swipeControls.SwipeDown)
desirePosition += Vector3.down;
other.Shoot1();
}
}
}
I just started using unity this week, so I'm quite new to the software. Thank you very much!
For coroutines you need to call this methods like this:
StartCoroutine(Shoot1());
I a little bit changed your classes:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Shooting : MonoBehaviour
{
public Transform firePoint;
public GameObject BulletRedPrefab;
public GameObject BulletGreenPrefab;
public float bulletForce = 20f;
void Start ()
{
}
void Update()
{
}
public void Shoot()
{
StartCoroutine(Shoot1());
}
private IEnumerator Shoot1()
{
yield return new WaitForSeconds(0.00001f);
GameObject bullet = Instantiate(BulletRedPrefab, firePoint.position, firePoint.rotation);
Rigidbody2D rb = bullet.GetComponent<Rigidbody2D>();
rb.AddForce(firePoint.up * bulletForce, ForceMode2D.Impulse);
}
}
And for GestrueDetector:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class GestrueDetector : MonoBehaviour
{
public Shooting other;
public Swipe swipeControls;
// Start is called before the first frame update
void Start()
{
}
// Update is called once per frame
private void Update()
{
if (GameObject.Find("robot") != null)
{
if (swipeControls.SwipeLeft)
desirePosition += Vector3.left;
other.Shoot();
if (swipeControls.SwipeRight)
desirePosition += Vector3.right;
other.Shoot();
if (swipeControls.SwipeUp)
desirePosition += Vector3.up;
other.Shoot();
if (swipeControls.SwipeDown)
desirePosition += Vector3.down;
other.Shoot();
}
}
}
Just read more about how coroutines are working in Unity - https://docs.unity3d.com/ScriptReference/Coroutine.html

Why the audio clip never heard when playing?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using Whilefun.FPEKit;
public class RoboSphereWindowBreakInteraction : MonoBehaviour
{
public Transform target;
public InteractableObjects interactableObjects;
public AudioClip audioClip;
public float speed;
private bool hasStarted = false;
private Animator anim;
void Update()
{
if ((Input.GetKeyDown(KeyCode.B) || (hasStarted == true)))
{
float step = speed * Time.deltaTime; // calculate distance to move
transform.position = Vector3.MoveTowards(transform.position, target.position, step);
hasStarted = true;
}
}
private void OnTriggerEnter(Collider other)
{
if (other.gameObject.name == "Square 1")
{
GetComponent<Rigidbody>().isKinematic = false;
hasStarted = false;
Destroy(GameObject.Find("Wall_Window_Long_03"));
}
}
public void ActivateRoboSphere()
{
foreach(Transform child in transform)
{
if(child.name == "Camera")
{
RepositionCamera(child);
}
}
anim = GetComponent<Animator>();
anim.enabled = true;
if (!anim.GetBool("Open_Anim"))
{
anim.SetBool("Open_Anim", true);
StartCoroutine(PlayAudio());
}
else
{
//anim.SetBool("Open_Anim", false);
}
}
private void RepositionCamera(Transform camera)
{
var Eyes = GameObject.Find("eyeDome");
camera.position = Eyes.transform.position + Eyes.transform.forward;
camera.LookAt(Eyes.transform);
camera.GetComponent<Camera>().enabled = true;
}
IEnumerator PlayAudio()
{
AudioSource audio = GetComponent<AudioSource>();
audio.Play();
yield return new WaitForSeconds(audio.clip.length);
audio.clip = audioClip;
audio.Play();
}
}
It's getting inside the PlayAudio but the sound is not heard.
The audio source component screenshot settings :
The only problem I see with this code is that initially, your audio source's clip isn't set to anything. Thus will result in a null ref exception on this line:
yield return new WaitForSeconds(audio.clip.length);
Add a null check and you should be good to go
if (audioSource.clip != null)
{
yield return new WaitForSeconds(audioSource.clip.length);
}

Jump/Throw Coding or Animation Issues

The Setup
I have a basketball player with an animator and 5 assigned animations to that animator as followed:
PlayerIdle
PlayerWalk
PlayerJump
PlayerBend
PlayerShoot
Setup_FruitHoops
Player Animation Window with Parameters
The Problem
In PlayMode, the player is able to move and jump successfully. The issue comes when the player attempts to grab the apple that is on the ground. The desired game design that I wanted was for the player to bend over and grab the apple by pressing the G key and then press G again to throw the apple towards the hoop to score a point. However, when I run it and after I first press G, the player can no longer jump, grab, or throw. The below section is the code for PlayerMovement and GrabberScript. Any advice is greatly appreciated.
PlayerMovement.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerMovement : MonoBehaviour
{
public float speed = 5f;
private Rigidbody2D rb;
private Animator anim;
private bool isGrounded, jumped;
private float jumpshotPower = 6f;
public Transform groundCheck;
public LayerMask groundLayer;
private void Awake()
{
rb = GameObject.Find("Player Parent").GetComponent<Rigidbody2D>();
anim = GameObject.Find("Player Parent").GetComponent<Animator>();
}
// Update is called once per frame
void Update()
{
CheckIfGrounded();
PlayerJump();
}
private void FixedUpdate()
{
PlayerWalk();
}
void PlayerWalk()
{
float h = Input.GetAxisRaw("Horizontal");
if (h > 0)
{
//going right
anim.SetBool("isWalking", true);
rb.velocity = new Vector2(speed, rb.velocity.y);
ChangeDirection(-1);
}
else if (h < 0)
{
//going left
anim.SetBool("isWalking", true);
rb.velocity = new Vector2(-speed, rb.velocity.y);
ChangeDirection(1);
}
else
{
//standing still
anim.SetBool("isWalking", false);
rb.velocity = new Vector2(0f, rb.velocity.y);
}
}
void ChangeDirection(int d)
{
Vector3 temp = transform.localScale;
temp.x = d;
transform.localScale = temp;
}
void CheckIfGrounded()
{
isGrounded = Physics2D.Raycast(groundCheck.position, Vector2.down, 0.1f, groundLayer);
if (isGrounded)
{
if (jumped)
{
jumped = false;
anim.SetBool("isJumping", false);
}
}
}
void PlayerJump()
{
if (isGrounded)
{
if (Input.GetKey(KeyCode.UpArrow))
{
jumped = true;
rb.velocity = new Vector2(rb.velocity.x, jumpshotPower);
anim.SetBool("isJumping", true);
}
}
}
}
GrabberScript.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class GrabberScript : MonoBehaviour
{
private bool grabbed, throwObject;
private RaycastHit2D hit;
public float distance;
public Transform holdpoint;
public float throwForce;
public LayerMask notFruitLayer;
private Animator anim;
private void Awake()
{
anim = GameObject.Find("Player Parent").GetComponent<Animator>();
}
// Update is called once per frame
void Update()
{
if (Input.GetKeyDown(KeyCode.G))
{
if (!grabbed)
{
//grab fruit
anim.Play("PlayerBend");
Physics2D.queriesStartInColliders = false;
hit = Physics2D.Raycast(transform.position, Vector3.down * transform.localScale.x, distance);
if(hit.collider != null && hit.collider.tag == "Apple")
{
grabbed = true;
}
}
else if(!Physics2D.OverlapPoint(holdpoint.position, notFruitLayer))
{
//throw fruit
grabbed = false;
if(hit.collider.gameObject.GetComponent<Rigidbody2D>() != null)
{
PlayerShooting();
}
}
if (grabbed)
{
hit.collider.gameObject.transform.position = holdpoint.position;
}
}
}
private void OnDrawGizmos()
{
Gizmos.color = Color.green;
Gizmos.DrawLine(transform.position, transform.position + Vector3.down * transform.localScale.x * distance);
}
void PlayerShooting()
{
if (grabbed == true)
{
if (Input.GetKey(KeyCode.G))
{
throwObject = true;
hit.collider.gameObject.GetComponent<Rigidbody2D>().velocity = new Vector2(transform.localScale.x, 1) * throwForce;
anim.Play("PlayerShoot");
}
}
}
}

First Person Shooter box collider problem

I'm creating a FPS game and I have the following issue:
Sometimes, when I shoot at the enemies the hit is not recognized, even if the player is shooting in front of them. However, when they attack the player, the hit is recognized normally.
They have a box collider and a rigidbody attached to them.
This script is attached to the player:
using System.Collections.Generic;
using UnityEngine;
public class DisparaArma : MonoBehaviour
{
private GerenciaArma gerenciaArma;
public float nDisparo = 15f;
private float TempoProximoDisparo;
public float damage = 20f;
private Animator ZoomCameraIn;
private bool zoomed;
private Camera Maincamera;
private GameObject mira;
// Start is called before the first frame update
void Start()
{
gerenciaArma = GetComponent<GerenciaArma>();
ZoomCameraIn = transform.Find(Tags.LOOK_ROOT).transform.Find(Tags.ZOOM_CAMERA).GetComponent<Animator>();
mira = GameObject.FindWithTag(Tags.MIRA);
Maincamera = Camera.main;
}
// Update is called once per frame
void Update()
{
Atira();
ZoomInAndOut();
}
void Atira()
{
if (Input.GetMouseButtonDown(0))
{
if(gerenciaArma.SelecionaArma().tipoBala == WeaponBulletType.BULLET)
{
gerenciaArma.SelecionaArma().AnimacaoTiro();
DisparaBala();
}
}
}
void ZoomInAndOut()
{
if (gerenciaArma.SelecionaArma().mira_tipo == TipoMira.AIM)
{
if (Input.GetMouseButtonDown(1))
{
ZoomCameraIn.Play(Animacoes.ZOOM_IN_ANIM);
// gerenciaArma.SelecionaArma().Aim(true);
mira.SetActive(false);
print("VaiZoom");
}
if (Input.GetMouseButtonUp(1))//
{
ZoomCameraIn.Play(Animacoes.ZOOM_OUT_ANIM);
//gerenciaArma.SelecionaArma().Aim(false);
mira.SetActive(true);
}
}
}
void DisparaBala()
{
RaycastHit hit;
if(Physics.Raycast(Maincamera.transform.position, Maincamera.transform.forward, out hit))
{
if (hit.transform.tag == Tags.ENEMY_TAG)
{
hit.transform.GetComponent<ScriptVida>().DanoAplicado(damage);
}
}
}
}
And this one is attached to the enemies:
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
public class ScriptVida : MonoBehaviour
{
private IndioAnimações indio_Anim;
private NavMeshAgent navAgent;
private IndioController indio_Controller;
public float vida = 100f;
public bool is_Player, is_Cannibal, is_Tiger;
private bool morto;
// Start is called before the first frame update
void Awake()
{
if (is_Tiger || is_Cannibal)
{
indio_Anim = GetComponent<IndioAnimações>();
indio_Controller = GetComponent<IndioController>();
navAgent = GetComponent<NavMeshAgent>();
}
if (is_Player)
{
}
}
public void DanoAplicado(float damage)
{
if (morto)
return;
vida -= damage;
if (is_Player)
{
}
if (is_Tiger || is_Cannibal)
{
if (indio_Controller.EnemyState == EnemyState.PATROL)
{
indio_Controller.chase_Distance = 50f;
}
}
if (vida <= 0)
{
JogadorMorre();
morto = true;
print(vida);
}
}
void JogadorMorre()
{
if (is_Cannibal)//
{
GetComponent<Animator>().enabled = false;
GetComponent<BoxCollider>().isTrigger = false;
GetComponent<Rigidbody>().AddTorque(-transform.forward * 50f);
indio_Controller.enabled = false;
navAgent.enabled = false;
indio_Anim.enabled = false;
}
if (is_Tiger)
{
GetComponent<Animator>().enabled = false;
GetComponent<BoxCollider>().isTrigger = false;
GetComponent<Rigidbody>().AddTorque(-transform.forward * 50f);
indio_Controller.enabled = false;
navAgent.enabled = false;
indio_Anim.enabled = false;
}
if (is_Player)
{
GameObject[] enemies = GameObject.FindGameObjectsWithTag(Tags.ENEMY_TAG);
for (int i = 0; i < enemies.Length; i++)
{
enemies[i].GetComponent<IndioController>().enabled = false;
}
GetComponent<Movimentação>().enabled = false;
GetComponent<DisparaArma>().enabled = false;
GetComponent<GerenciaArma>().SelecionaArma().gameObject.SetActive(false);
}
if (tag == Tags.PLAYER_TAG)
{
Invoke("RestartGame", 3f);
}
else
{
Invoke("TurnOffGameObject", 3f);
}
}
void RestartGame()
{
UnityEngine.SceneManagement.SceneManager.LoadScene("Gameplay");
}
void TurnOffGameObject()
{
gameObject.SetActive(false);
}
}
I think the problem is related to the box collider.
How could I solve this guys?

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