Develop Reference

How do i add multiple enemies to my unity wave system?

I have a wave script for my game and it works fine, however after a while I have realised it gets quite dull fighting against the same enemies over and over again, so I was wondering if I could make a list of some sort to store all enemies that will be in each wave.
Here is my script;
SpawnManager.cs
using System.Collections;
using UnityEngine;
[System.Serializable]
public class Wave
{
public int EnemiesPerWave;
public GameObject Enemy;
}
public class SpawnManager : MonoBehaviour
{
public Wave[] Waves; // class to hold information per wave
public Transform[] SpawnPoints;
public float TimeBetweenEnemies = 2f;
public GameObject HelpText;
public GameObject Shop;
public GameObject shopfx;
public Transform ShopL;
bool shopactive = false;
private int _totalEnemiesInCurrentWave;
private int _enemiesInWaveLeft;
private int _spawnedEnemies;
private int _currentWave;
private int _totalWaves;
void Start ()
{
_currentWave = -1; // avoid off by 1
_totalWaves = Waves.Length - 1; // adjust, because we're using 0 index
StartNextWave();
}
void Update()
{
if (_enemiesInWaveLeft <= 0 && Input.GetKeyDown(KeyCode.R))
{
StartNextWave();
}
}
void StartNextWave()
{
_currentWave++;
// win
if (_currentWave > _totalWaves)
{
return;
}
_totalEnemiesInCurrentWave = Waves[_currentWave].EnemiesPerWave;
_enemiesInWaveLeft = 0;
_spawnedEnemies = 0;
StartCoroutine(SpawnEnemies());
}
// Coroutine to spawn all of our enemies
IEnumerator SpawnEnemies()
{
GameObject enemy = Waves[_currentWave].Enemy;
while (_spawnedEnemies < _totalEnemiesInCurrentWave)
{
_spawnedEnemies++;
_enemiesInWaveLeft++;
int spawnPointIndex = Random.Range(0, SpawnPoints.Length);
// Create an instance of the enemy prefab at the randomly selected spawn point's
// position and rotation.
Instantiate(enemy, SpawnPoints[spawnPointIndex].position,
SpawnPoints[spawnPointIndex].rotation);
yield return new WaitForSeconds(TimeBetweenEnemies);
}
yield return null;
}
// called by an enemy when they're defeated
public void EnemyDefeated()
{
_enemiesInWaveLeft--;
// We start the next wave once we have spawned and defeated them all
if (_enemiesInWaveLeft == 0 && _spawnedEnemies == _totalEnemiesInCurrentWave)
{
HelpText.SetActive(true);
Invoke("SetFalse",5.0f);
Shop.SetActive(true);
Invoke("LateUpdate",1f);
Instantiate(shopfx, new Vector3(ShopL.transform.position.x, ShopL.transform.position.y, ShopL.transform.position.z), Quaternion.identity);
shopactive = true;
}
}
void SetFalse()
{
HelpText.SetActive(false);
}
void LateUpdate()
{
if(Input.GetKeyDown(KeyCode.R) && shopactive == true)
{
Shop.SetActive(false);
Instantiate(shopfx, new Vector3(Shop.transform.position.x, Shop.transform.position.y, Shop.transform.position.z), Quaternion.identity);
shopactive = false;
}
}
}

How can I change the moving objects speed at runtime?

The manager script
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
public class DronesManager : MonoBehaviour
{
public GameObject target;
public float movementSpeed;
public float launchTime;
public Transform dronesUnchild;
private List<GameObject> drones = new List<GameObject>();
private float currentDroneSpeed;
private void Awake()
{
currentDroneSpeed = movementSpeed;
}
// Start is called before the first frame update
void Start()
{
target = GameObject.Find("Base");
drones = GameObject.FindGameObjectsWithTag("Drone").ToList();
StartCoroutine(MoveDrone());
}
// Update is called once per frame
void Update()
{
if(currentDroneSpeed != movementSpeed)
{
for(int i = 0; i < drones.Count; i++)
{
var droneControl = drones[i].GetComponent<DroneControl>();
droneControl.movingSpeed = movementSpeed;
}
currentDroneSpeed = movementSpeed;
}
}
private IEnumerator MoveDrone()
{
// same as you did:
drones = GameObject.FindGameObjectsWithTag("Drone").ToList();
foreach(var drone in drones)
{
drone.GetComponent<DroneControl>().target = target.transform;
}
while (drones.Count > 0)
{
// pick one at random, get it
int index = Random.Range(0, drones.Count);
var drone = drones[index];
// remove it from list
drones.RemoveAt(index);
// TODO: might want to check/guard if drone == null ... this guards against it
// being Destroy()ed and yet still lying around in our list marked as "dead"
// simplified your get-component-and-go-if-not-already-going code here
var droneControl = drone.GetComponent<DroneControl>();
if (droneControl.go == false)
{
droneControl.movingSpeed = movementSpeed;
droneControl.go = true;
drone.transform.parent = dronesUnchild;
}
// wait
yield return new WaitForSeconds(launchTime);
}
}
}
I tried to add this part in the Update
void Update()
{
if(currentDroneSpeed != movementSpeed)
{
for(int i = 0; i < drones.Count; i++)
{
var droneControl = drones[i].GetComponent<DroneControl>();
droneControl.movingSpeed = movementSpeed;
}
currentDroneSpeed = movementSpeed;
}
}
and this script is attached to each moving object
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class DroneControl : MonoBehaviour
{
public Transform target;
public float turnSpeed = .01f;
Quaternion rotGoal;
Vector3 direction;
public float movingSpeed;
public bool go = false;
private bool waitBeforeRotate = false;
private bool startRotating = false;
#region AddedCode
public float targetRange = 1.0f;
private bool IsTargetReached(Vector3 dronePos, Vector3 targetPos)
{
var distance = Vector3.Distance(dronePos, targetPos);
return distance < targetRange;
}
#endregion AddedCode
// Update is called once per frame
void Update()
{
// next line is modified to incorporate the range check
if (go && !IsTargetReached(transform.position, target.position))
{
transform.position += transform.forward * movingSpeed * Time.deltaTime;
if (waitBeforeRotate == false)
{
StartCoroutine(StartRotating());
waitBeforeRotate = true;
}
if (startRotating)
{
direction = (target.position - transform.position).normalized;
rotGoal = Quaternion.LookRotation(direction);
transform.rotation = Quaternion.Slerp(transform.rotation, rotGoal, turnSpeed);
}
}
}
IEnumerator StartRotating()
{
yield return new WaitForSeconds(3f);
startRotating = true;
}
}
but it's never change the speed of moving objects.
if the speed of each moving object in the editor start is 5 for example and in the manager script I change the speed to 100 the speed of each object is still 5.

Maybe this is happening because after picking a random drone in IEnumerator you instantly remove it from the list?
So in Update() you set a speed for all drones, except the ones that are already moving.

How to change player speed with public float from another script

Hey I am trying to change a float when my player collides with a object. I tried many ways of reference but only got null when trying to debug I came up with this so far. I want to get the gameobject that contains the player script meaning the player and after I want to get the component script tankmovement to change the variable in it.
Getting the null reference error in the powerups script line 79 reset function Tank=GameObject.FindWithTag("Player")
using System.Collections.Generic;
using UnityEngine;
public class PowerUp : MonoBehaviour {
public bool boosting = false;
public GameObject effect;
public AudioSource clip;
public GameObject Tank;
private void Start()
{
Tank = GameObject.Find("Tank(Clone)");
TankMovement script = GetComponent<TankMovement>();
}
private void OnTriggerEnter(Collider other)
{
if (other.gameObject.CompareTag("Player"))
{
if (!boosting)
{
clip.Play();
GameObject explosion = Instantiate(effect, transform.position, transform.rotation);
Destroy(explosion, 2);
GetComponent<MeshRenderer>().enabled = false;
GetComponent<Collider>().enabled = false;
Tank.GetComponent<TankMovement>().m_Speed = 20f;
//TankMovement.m_Speed = 20f;
boosting = true;
Debug.Log(boosting);
StartCoroutine(coolDown());
}
}
private IEnumerator coolDown()
{
if (boosting == true)
{
yield return new WaitForSeconds(4);
{
boosting = false;
GetComponent<MeshRenderer>().enabled = true;
GetComponent<Collider>().enabled = true;
Debug.Log(boosting);
// Destroy(gameObject);
}
}
}
void reset()
{
//TankMovement.m_Speed = 12f;
TankMovement collidedMovement = Tank.gameObject.GetComponent<TankMovement>();
collidedMovement.m_Speed = 12f;
//TankMovement1.m_Speed1 = 12f;
}
}
}
Trying to call on my m_Speed float in the player script to boost the speed of my player when he collides with it. How would you get a proper reference since my player is a prefab.
Tank script
using UnityEngine;
public class TankMovement : MonoBehaviour
{
public int m_PlayerNumber = 1;
public float m_Speed = 12f;
public float m_TurnSpeed = 180f;
public AudioSource m_MovementAudio;
public AudioClip m_EngineIdling;
public AudioClip m_EngineDriving;
public float m_PitchRange = 0.2f;
private string m_MovementAxisName;
private string m_TurnAxisName;
private Rigidbody m_Rigidbody;
private float m_MovementInputValue;
private float m_TurnInputValue;
private float m_OriginalPitch;
private void Awake()
{
m_Rigidbody = GetComponent<Rigidbody>();
}
private void OnEnable ()
{
m_Rigidbody.isKinematic = false;
m_MovementInputValue = 0f;
m_TurnInputValue = 0f;
}
private void OnDisable ()
{
m_Rigidbody.isKinematic = true;
}
private void Start()
{
m_MovementAxisName = "Vertical" + m_PlayerNumber;
m_TurnAxisName = "Horizontal" + m_PlayerNumber;
m_OriginalPitch = m_MovementAudio.pitch;
}
private void Update()
{
// Store the player's input and make sure the audio for the engine is playing.
m_MovementInputValue = Input.GetAxis(m_MovementAxisName);
m_TurnInputValue = Input.GetAxis(m_TurnAxisName);
EngineAudio();
}
private void EngineAudio()
{
// Play the correct audio clip based on whether or not the tank is moving and what audio is currently playing.
if (Mathf.Abs(m_MovementInputValue) < 0.1f && Mathf.Abs(m_TurnInputValue) < 0.1f)
{
if (m_MovementAudio.clip == m_EngineDriving)
{
m_MovementAudio.clip = m_EngineIdling;
m_MovementAudio.pitch = Random.Range(m_OriginalPitch - m_PitchRange, m_OriginalPitch + m_PitchRange);
m_MovementAudio.Play();
}
}
else
{
if (m_MovementAudio.clip == m_EngineIdling)
{
m_MovementAudio.clip = m_EngineDriving;
m_MovementAudio.pitch = Random.Range(m_OriginalPitch - m_PitchRange, m_OriginalPitch + m_PitchRange);
m_MovementAudio.Play();
}
}
}
private void FixedUpdate()
{
// Move and turn the tank.
Move();
Turn();
}
private void Move()
{
// Adjust the position of the tank based on the player's input.
Vector3 movement = transform.forward * m_MovementInputValue * m_Speed * Time.deltaTime;
m_Rigidbody.MovePosition(m_Rigidbody.position + movement);
}
private void Turn()
{
// Adjust the rotation of the tank based on the player's input.
float turn = m_TurnInputValue * m_TurnSpeed * Time.deltaTime;
Quaternion turnRotation = Quaternion.Euler(0f, turn, 0);
m_Rigidbody.MoveRotation(m_Rigidbody.rotation * turnRotation);
}
}

Since the TankMovement component you need to access is attached to the GameObject that is colliding with the power, you can get the TankMovement component you need to change by using other.gameObject.GetComponent<TankMovement>():
private void OnTriggerEnter(Collider other)
{
if (other.gameObject.CompareTag("Player"))
{
if (!boosting)
{
// stuff
TankMovement collidedMovement = other.gameObject.GetComponent<TankMovement>();
collidedMovement.m_Speed = 20f;
// more stuff
}
}
}

transform does not exits in current context

I am finding it hard to figure out why my transform is wrong. Can anyone help me on this problem. I am trying to make a FSM for my enemy so it either goes for the player or go for food. But when I try to test it I get a compiler error.
using UnityEngine;
using System.Collections;
public class Enemy : MovingObject
{
public int playerDamage;
private Animator animator;
private Transform target;
private bool skipMove;
private Transform Player;
public AudioClip enemyAttack1;
public AudioClip enemyAttack2;
protected override void Start ()
{
GameManager.instance.AddEnemeyToList(this);
animator = GetComponent<Animator> ();
target = GameObject.FindGameObjectWithTag ("Food").transform;
base.Start ();
AIEnemy();
Player = GameObject.FindWithTag("Player").transform;
}
protected override void AttemptMove<T> (int xDir, int yDir)
{
if (skipMove)
{
skipMove = false;
return;
}
base.AttemptMove <T> (xDir, yDir);
skipMove = true;
}
public void MoveEnemy()
{
int xDir = 0;
int yDir = 0;
if (Mathf.Abs (target.position.x - transform.position.x) < float.Epsilon)
yDir = target.position.y > transform.position.y ? 1 : -1;
else
xDir = target.position.x > transform.position.x ? 1 : -1;
AttemptMove<Player> (xDir, yDir);
}
protected override void OnCantMove <T> (T component)
{
Player hitPlayer = component as Player;
hitPlayer.LoseFood (playerDamage);
animator.SetTrigger("enemyAttack");
SoundManager.instance.RandomizeSfx (enemyAttack1, enemyAttack2);
}
private void OnTriggerEnter2D(Collider2D other)
{
if (other.tag == "Food")
{
other.gameObject.SetActive(false);
}
else if (other.tag == "Soda")
{
other.gameObject.SetActive(false);
}
}
void AIEnemy()
{
int State = 0;
if (State == 0)
{
transform.LookAt(Player);
State++;
}
if (State == 1)
transform.LookAt(target);
Debug.Log("State 1");
State++;
if (State == 2)
{
Debug.Log("State 2");
}
}
}
public Transform FindClosetFood()
{
float minDistance = float.PositiveInfinity;
Transform closetFood = null;
GameObject[] foods = GameObject.FindGameObjectsWithTag("Food");
for(int i = 0; i<foods.Length; i++)
{
float distance = Vector2.Distance(transform.position, foods[i].transform.position);
if (distance < minDistance)
{
minDistance = distance;
closetFood = foods[i].transform;
}
}
return closetFood;
}
}
I added a private Transform Player. So my enemy knows what to look at but I still dont get anything in console. And I tried calling it in start. But now I ended up with this compiler error.
The error comes in this line
float distance = Vector2.Distance("transform".position, foods[i].transform.position);
MovingObject script:
using UnityEngine;
using System.Collections;
public abstract class MovingObject : MonoBehaviour
{
public float moveTime = 0.1f;
public LayerMask blockingLayer;
private BoxCollider2D boxCollider;
private Rigidbody2D rb2D;
private float inverseMoveTime;
// Use this for initialization
protected virtual void Start ()
{
boxCollider = GetComponent<BoxCollider2D> ();
rb2D = GetComponent<Rigidbody2D> ();
inverseMoveTime = 1f / moveTime;
}
protected bool Move (int xDir, int yDir, out RaycastHit2D hit)
{
Vector2 start = transform.position;
Vector2 end = start + new Vector2 (xDir, yDir);
boxCollider.enabled = false;
hit = Physics2D.Linecast (start, end, blockingLayer);
boxCollider.enabled = true;
if (hit.transform == null)
{
StartCoroutine(SmoothMovement (end));
return true;
}
return false;
}
protected IEnumerator SmoothMovement (Vector3 end)
{
float sqrRemainingDistance = (transform.position - end).sqrMagnitude;
while (sqrRemainingDistance > float.Epsilon)
{
Vector3 newPosition = Vector3.MoveTowards (rb2D.position, end, inverseMoveTime * Time.deltaTime);
rb2D.MovePosition(newPosition);
sqrRemainingDistance = (transform.position - end).sqrMagnitude;
yield return null;
}
}
protected virtual void AttemptMove <T> (int xDir, int yDir) where T : Component
{
RaycastHit2D hit;
bool canMove = Move (xDir, yDir, out hit);
if (hit.transform == null)
return;
T hitComponent = hit.transform.GetComponent<T> ();
if(!canMove && hitComponent != null)
OnCantMove (hitComponent);
}
protected abstract void OnCantMove <T> (T component) where T : Component;
}

It can't find transform.position because transform is a variable undeclared under Component. MonoBehaviour drives from Behaviour and Behaviour derives from Component. To get access to the transform variable, your script must derive from one of these. Although MonoBehaviour is what the script should derive from.
In code, your Enemy script already derive from MovingObject script which derives from MonoBehaviour so that should give you access to the transform variable but there is a problem. There is an extra } at the end of the AIEnemy() function in your Enemy script. That extra } at the end of the AIEnemy() function closes or marks the end of the Enemy script therefore making the transform variable unavailable to you. Remove the extra } at the end of the AIEnemy() function and your problem should be fixed.
If you can't find it, use the new Enemy script below:
public class Enemy : MovingObject
{
public int playerDamage;
private Animator animator;
private Transform target;
private bool skipMove;
private Transform Player;
public AudioClip enemyAttack1;
public AudioClip enemyAttack2;
protected override void Start()
{
GameManager.instance.AddEnemeyToList(this);
animator = GetComponent<Animator>();
target = GameObject.FindGameObjectWithTag("Food").transform;
base.Start();
AIEnemy();
Player = GameObject.FindWithTag("Player").transform;
}
protected override void AttemptMove<T>(int xDir, int yDir)
{
if (skipMove)
{
skipMove = false;
return;
}
base.AttemptMove<T>(xDir, yDir);
skipMove = true;
}
public void MoveEnemy()
{
int xDir = 0;
int yDir = 0;
if (Mathf.Abs(target.position.x - transform.position.x) < float.Epsilon)
yDir = target.position.y > transform.position.y ? 1 : -1;
else
xDir = target.position.x > transform.position.x ? 1 : -1;
AttemptMove<Player>(xDir, yDir);
}
protected override void OnCantMove<T>(T component)
{
Player hitPlayer = component as Player;
hitPlayer.LoseFood(playerDamage);
animator.SetTrigger("enemyAttack");
SoundManager.instance.RandomizeSfx(enemyAttack1, enemyAttack2);
}
private void OnTriggerEnter2D(Collider2D other)
{
if (other.tag == "Food")
{
other.gameObject.SetActive(false);
}
else if (other.tag == "Soda")
{
other.gameObject.SetActive(false);
}
}
void AIEnemy()
{
int State = 0;
if (State == 0)
{
transform.LookAt(Player);
State++;
}
if (State == 1)
transform.LookAt(target);
Debug.Log("State 1");
State++;
if (State == 2)
{
Debug.Log("State 2");
}
}
public Transform FindClosetFood()
{
float minDistance = float.PositiveInfinity;
Transform closetFood = null;
GameObject[] foods = GameObject.FindGameObjectsWithTag("Food");
for (int i = 0; i < foods.Length; i++)
{
float distance = Vector2.Distance(transform.position, foods[i].transform.position);
if (distance < minDistance)
{
minDistance = distance;
closetFood = foods[i].transform;
}
}
return closetFood;
}
}

Unity3D Text object gets removed in inspector when starting the game (Gif should make clear)

So I was wondering why this happens... https://gyazo.com/51e7951c85992d7f8851462e59da65da Gif should make clear what's wrong.
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class GrowlitheShieldSpell : MonoBehaviour {
public GameObject Shield;
public float coolDown = 10;
public float coolDownTimer;
public float EffectcoolDown = 5;
public float EffectcoolDownTimer;
public bool ShieldActive;
GameObject ShieldClone;
public GameObject Growlithe;
public GameObject BuffEffectcoolDowngo;
public Text BuffEffectcoolDownText;
public GameObject ShieldBuffIcon;
void Start(){
ShieldActive = false;
}
void Update () {
if (coolDownTimer < 0) {
coolDownTimer = 0;
}
if (EffectcoolDownTimer < 0) {
EffectcoolDownTimer = 0;
}
if (coolDownTimer > 0) {
coolDownTimer -= Time.deltaTime;
}
if (coolDownTimer == 0){
if (Input.GetKeyDown(KeyCode.Z)){
if (ShieldActive == false){
//when effect starts
ShieldClone = Instantiate(Shield, transform.position, Quaternion.identity)as GameObject;
ShieldClone.SetActive(true);
coolDownTimer = coolDown;
ShieldActive = true;
}}}
//when effect is over
if (EffectcoolDownTimer == 0) {
Shield.SetActive (false);
ShieldActive = false;
EffectcoolDownTimer = EffectcoolDown;
Destroy(ShieldClone);
ShieldBuffIcon.SetActive (false);
}
if (ShieldActive == true) {
EffectcoolDownTimer -= Time.deltaTime;
ShieldClone.transform.position = Growlithe.transform.position;
BuffEffectcoolDownText.text = EffectcoolDownTimer.ToString();
ShieldBuffIcon.SetActive (true);
}
}
}
I hope the cod makes it more clear... It's just very weird that the object gets removed while I never asked for it in any way inside the script. Any help?