Develop Reference

How do i get one object to track and move towards another object

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class EnemyControler : MonoBehaviour
{
private Transform player;
// Start is called before the first frame update
void Start()
{
//Note in this case we're saving the transform in a variable to work with later.
//We could save the player's game object (and just remove .transform from the below) but this is cleaner
var player = GameObject.FindWithTag("Player").transform;
}
// Update is called once per frame
void Update()
{
//**** The code below you need to modify and move into your own method and call that method from here.
//**** Don't overthink it. Look at how Start() is defined. Your own Move method would look the exact same.
//**** Experiment making it private void instead of public void. It should work the same.
//How much will we move by after 1 second? .5 meter
var step = .5f * Time.deltaTime; // 5 m/s
var newPosition = Vector3.MoveTowards(transform.position, player, step);//This is one way to move a game object by updating the transform. Watch the videos in this module and it should become apparent what goes here.
}
}
The transform does not map to the tagged player. I was trying to get an enemy in unity to move towards a moving player for a class, but I'm completely lost.

You had three issues in your code. The first was that you were defining a new player variable in the Start method. This hid the player member field you defined earlier.
The second issue was that you were getting a value to move towards, but you weren't assigning that value to the current objects position.
The third issue was that you were feeding in a Transform into the MoveTowards method, when you should have been feeding in a Vector2.
The code below should rectify these issues.
public class EnemyControler : MonoBehaviour
{
private Transform _player;
void Start()
{
_player = GameObject.FindWithTag("Player").transform;
}
void Update()
{
var step = .5f * Time.deltaTime;
transform.position = Vector3.MoveTowards(transform.position, _player.position, step);
}
}

Try doing something like this ive used this in the past to do something similar once you understand the code change it to what you desire
public int minRange;
private Transform target = null;
private void OnTriggerEnter(Collider other)
{
if (other.tag == "Player")
target = other.transform;
}
private void OnTriggerExit(Collider other)
{
if (other.tag == "Player")
target = null;
}
void update()
{
transform.LookAt(target);
float distance = Vector3.Distance(transform.position,
target.position);
bool tooClose = distance < minRange;
Vector3 direction = tooClose ? Vector3.back : Vector3.forward;
if (direction == Vector3.forward)
{
transform.Translate(direction * 6 * Time.deltaTime);
}
else
{
transform.Translate(direction * 3 * Time.deltaTime);
}
}

Moving a rigid body in the direction it's facing in Unity and C#

I've been trying to get this working using pretty much every method I can find (even using the dreaded transform.translate) but I just can't seem to get it working. This is just a draft of the code and if there are any other ways to go about it I'm down to change some stuff.
Currently, he barely moves (it looks like he's getting stuck on the floor somehow.) I'm fairly new to moving objects using rigid bodies so I'm pretty much in the dark on how to solve this issue.
Here's the script from my latest crack at it:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerTest : MonoBehaviour
{
public float speed = 10.0f;
public Rigidbody rb;
public Vector3 movement;
// Start is called before the first frame update
void Start()
{
rb.GetComponent<Rigidbody>();
}
// Update is called once per frame
void Update()
{
if (Input.GetKeyDown("w"))
{
movement = new Vector3(Input.GetAxis("Horizontal"), 0.0f, Input.GetAxis("Vertical"));
}
}
void FixedUpdate()
{
moveCharacter(movement);
}
void moveCharacter(Vector3 direction)
{
rb.MovePosition(transform.position + (transform.forward * speed * Time.deltaTime));
}
}

In your code you have your moveCharacter function inside your Update function, enclosed is the fixed one, which should work now. Before your FixedUpdate was not getting called, therefore your moveCharacter function was not as well and your GameObject was not moving.
EDIT 1: You shoud also multiply with your movement direction as well, updated the script to fit that
EDIT 2: I misplaced the curly brackets, fixed that now
EDIT 3: You should also update your movement Vector3 every frame, not if W is pressed, fixed the script again.
EDIT 4: Fixed the movement bug (copy and paste entire script, since i changed more lines)
This is the updated script:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerTest : MonoBehaviour
{
public float speed = 10.0f;
public Rigidbody rb;
public Vector3 movement;
// Start is called before the first frame update
void Start()
{
rb.GetComponent<Rigidbody>();
}
// Update is called once per frame
void Update()
{
movement = new Vector3(Input.GetAxis("Horizontal"), 1f, Input.GetAxis("Vertical"));
}
void FixedUpdate()
{
moveCharacter(movement);
}
void moveCharacter(Vector3 direction)
{
Vector3 offset = new Vector3(movement.x * transform.position.x, movement.y * transform.position.y, movement.z * transform.position.z);
rb.MovePosition(transform.position + (offset * speed * Time.deltaTime));
}
}
References: Rigidbody.MovePosition

Make Animation Play After Boolean is Set to True?

I am pretty fluent in using Unity, but regarding Mechanim and Animations I am not the too great at currently, so please don't give me too much of a hard time lol. So I have this boolean that is in my GameManager script:
public bool countDownDone = false;
This boolean gets set to true once my "3,2,1, GO!" Countdown Timer ends at the beginning of my game. Everything in my game starts after that boolean is set to true. Example:
using UnityEngine;
using System.Collections;
public class PlaneMover : MonoBehaviour {
private GameManagerScript GMS; // Reference to my GameManager Script
public float scrollSpeed;
public float tileSizeZAxis;
public float acceleration; //This has to be a negative number in the inspector. Since our plane is coming down.
private Vector3 startPosition;
void Start () {
GMS = GameObject.Find ("GameManager").GetComponent<GameManagerScript> (); //Finds the Script at the first frame
// Transform position of the quad
startPosition = transform.position;
}
void Update () {
if (GMS.countDownDone == true) //Everything starts once the countdown ends.
{
/* Every frame - time in the game times the assigned scroll speed
and never exceed the length of the tile that we assign */
float newPosition = Mathf.Repeat (Time.time * scrollSpeed, tileSizeZAxis);
// New position equal to the start position plus vector3forward times new position
transform.position = startPosition + Vector3.forward * newPosition; // was vector3.forward
scrollSpeed += Time.deltaTime * acceleration; // This makes the plane increase in speed over time with
// whatever our acceleration is set to.
}
}
}
I have this Crawling animation that plays at the very beginning of the game (Even before the Timer ends) and loops forever. My question is , how do I make that crawling animation also start once that boolean is set to "true"? Or do I just apply it to a CoRoutine and make it play after 3 seconds? I have done extensive research on whether to reference Animation or Animator and I got confused on that too. Any advice? If you need more pictures or details on my question, just let me know. Thank you! :)
NEW CODE BELOW
using UnityEngine;
using System.Collections;
public class Crawling : MonoBehaviour {
Animator animator;
private GameManagerScript GMS;
void Start ()
{
animator = GetComponent<Animator> ();
GMS = GameObject.Find ("GameManager").GetComponent<GameManagerScript> ();
}
void Update ()
{
if (GMS.countDownDone == true)
{
animator.Play("Main Character Crawling", 1);
}
}
}

I have this Crawling animation that plays at the very beginning of the
game (Even before the Timer ends) and loops forever. My question is ,
how do I make that crawling animation also start once that boolean is
set to "true"?
The solution is to play the animation from script.
Remove the currentAnimation.
Select the GameObject your PlaneMover script is attached to, attach Animation and Animator components to it. Make sure that the Animation's Play Automatically is unchecked.
public class PlaneMover : MonoBehaviour {
private GameManagerScript GMS; // Reference to my GameManager Script
public float scrollSpeed;
public float tileSizeZAxis;
public float acceleration; //This has to be a negative number in the inspector. Since our plane is coming down.
private Vector3 startPosition;
Animation animation;
public AnimationClip animationClip; //Assign from Editor
void Start () {
GMS = GameObject.Find ("GameManager").GetComponent<GameManagerScript> (); //Finds the Script at the first frame
// Transform position of the quad
startPosition = transform.position;
animation = GetComponent<Animation>();
//Add crawing Animation
animation.AddClip(animationClip, "Crawling");
//Add other animation clips here too if there are otheres
}
void Update ()
{
if (GMS.countDownDone) //Everything starts once the countdown ends.
{
/* Every frame - time in the game times the assigned scroll speed
and never exceed the length of the tile that we assign */
float newPosition = Mathf.Repeat (Time.time * scrollSpeed, tileSizeZAxis);
// New position equal to the start position plus vector3forward times new position
transform.position = startPosition + Vector3.forward * newPosition; // was vector3.forward
scrollSpeed += Time.deltaTime * acceleration; // This makes the plane increase in speed over time with
// whatever our acceleration is set to.
//Play Animation
animation.PlayQueued("Crawling", QueueMode.CompleteOthers);
}
}
} }

I solved the problem!!
This is my script:
using UnityEngine;
using System.Collections;
public class Crawling : MonoBehaviour {
public Animator animator;
private GameManagerScript GMS;
void Start ()
{
animator = GetComponent<Animator> ();
GMS = GameObject.Find ("GameManager").GetComponent<GameManagerScript> ();
}
void Update ()
{
if (GMS.countDownDone == true) {
animator.enabled = true;
}
else
{
animator.enabled = false;
}
}
}
All I do is just enable the Animator that I attach in the Inspector whenever "countDownDone" becomes "true", and for added safety, I added the "else" for it to be disabled. If someone notices a way for me to improve this script, please let me know. Thank you :)
Shorter version:
if (GMS.countDownDone)
animator.enabled = true;
else
animator.enabled = false;

Unity C# check if player (Rigidbody2D) stopped moving for x seconds

I'm working on a script, so I could detect when player is not moving for x seconds and load another scene accordingly.
If player started moving again after x seconds, then loading another scene should't be called.
I've tried using isSleeping function and delay it by including Coroutine with WaitForSeconds but it is still checking Rigidbody2D every frame. Is there any other way to check if Rigidbody2D hasn't moved for x seconds and only then load game over level, otherwise continue moving as before?
using UnityEngine;
using System.Collections;
public class PlayerStop : MonoBehaviour {
void Update() {
if (GetComponent<Rigidbody2D>().IsSleeping()) {
Application.LoadLevel(2);
}
}
}
In addition I have a script, which enables me to draw lines (with mouse) and stop player's movement, however lines disappear after x seconds. So for example if I'd set lines to disappear after 1 second, I would like to check if Rigidbody2D stopped moving for 2 seconds and only then load game over scene. Otherwise do nothing as Rigidbody2D will continue moving again after line disappears.

Try this
using UnityEngine;
using System.Collections;
public class PlayerStop : MonoBehaviour {
float delay = 3f;
float threshold = .01f;
void Update() {
if (GetComponent<Rigidbody2D>().velocity.magnitude < threshold * threshold)
StartCoRoutine("LoadTheLevel");
}
IEnumerator LoadTheLevel()
{
float elapsed = 0f;
while (GetComponent<Rigidbody2D>().velocity.magnitude < threshold * threshold)
{
elapsed += Time.deltaTime;
if(elapsed >= delay)
{
Application.LoadLevel(2);
yield break;
}
yield return null;
}
yield break;
}
}

You could try this...I'm not able to test this right now, so may need a little tweaking...
First some private variables:
private float _loadSceneTime;
private Vector3 _lastPlayerPosition;
private float _playerIdleDelay;
And in the Update method check if the player has moved:
private void Update()
{
// Is it time to load the next scene?
if(Time.time >= _loadSceneTime)
{
// Load Scene
}
else
{
// NOTE: GET PLAYERS POSITION...THIS ASSUMES THIS
// SCRIPT IS ON THE GAME OBJECT REPRESENTING THE PLAYER
Vector3 playerPosition = this.transform.position;
// Has the player moved?
if(playerPosition != _lastPlayerPosition)
{
// If the player has moved we will attempt to load
// the scene in x-seconds
_loadSceneTime = Time.time + _playerIdleDelay;
}
_lastPlayerPosition = playerPosition;
}
}

Firing Projectiles in the same direction as my character is looking. [UNITY 2D TOPDOWN]

I've searched through a bunch of posts on Top Down 2D rotation with firing missiles and none of them apply to mine.
My Wizard manages to fire his magicmissiles from his wand but they come out unaligned with his wands direction. It should be taking the Z value from the Quaternion of the wand and assigning that as the angle it goes out in ( or atleast thats what i believe it should be doing) But it seems to rotate faster than the wand and whilst it does change if I spin it isn't changing equally with the wand. So whilst if I point up it will fire up. If i point 45 degrees right of that it fires the missile directly into my wizard.
The Code for the MissileMovement ---------------
using UnityEngine;
using System.Collections;
public class MoveMissile : MonoBehaviour {
// Use this for initialization
public float speed = 0.5F;
public Transform Shotspawn;
// public Quaternion Direction;
private float Direction;
void Start (){
// Sets the direction that shot is fired in.
Direction = transform.rotation.eulerAngles.z;
transform.Rotate(0 , 0, Direction);
}
// Update is called once per frame
void Update () {
transform.Translate(Vector2.up * speed);
}
}
The Code for the Character Movement ---------------------------
using UnityEngine;
using System.Collections;
public class TopDownCharController2 : MonoBehaviour {
// Movement Variables
public float walkSpeed;
public bool colliding;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update ()
{
if(Input.GetKey (KeyCode.I))
{transform.Translate(Vector2.up * walkSpeed); } // UP MOVEMENT
if(Input.GetKey(KeyCode.J))
{transform.Translate(-Vector2.right * walkSpeed); } // LEFT MOVEMENT
if(Input.GetKey(KeyCode.K))
{transform.Translate(-Vector2.up * walkSpeed); }// DOWN MOVEMENT
if(Input.GetKey(KeyCode.L))
{transform.Translate(Vector2.right * walkSpeed); }// RIGHT MOVEMENT
if(Input.GetKey(KeyCode.U)) {
// Clockwise
transform.Rotate(0, 0, -3.0f);
}
if(Input.GetKey(KeyCode.O)) {
// Counter-clockwise
transform.Rotate(0, 0, 3.0f);
}
}
}
If anyone could show me where i'm going wrong that would be lovely. :)

So the reason it doesn't work is because it reads the direction and then adds a bit more to it so it sort of over corrects. So the code should read:
using UnityEngine;
using System.Collections;
public class MoveMissile : MonoBehaviour {
// Use this for initialization
public float speed = 0.5F;
public Transform Shotspawn;
void Start (){
// Sets the direction that shot is fired in.
transform.rotation=Shotspawn.rotation;
}
// Update is called once per frame
void Update () {
transform.Translate(Vector2.up * speed);
}
}