Develop Reference

Unity: Why wont my movement return to value 0

Hi im new to programming in C# and i ran into a problem.Eveything is working,only the value wont return to 0 when the button is not pressed,i can change the direction of the movement,but the object wont stop moving...Here is the code!
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class Movement : MonoBehaviour
{
private Rigidbody2D rb2D;
private float speed = 1f;
private float moveHorizontal;
void Start()
{
rb2D = GetComponent<Rigidbody2D>();
}
void Update()
{
moveHorizontal = Input.GetAxisRaw("Horizontal");
}
void FixedUpdate()
{
if (moveHorizontal > 0.1f || moveHorizontal < -0.1f)
{
rb2D.AddForce(new Vector2 (moveHorizontal * speed, 0f), ForceMode2D.Impulse);
}
}
}

I see you adding forces, but you never reset the velocity to 0 anywhere
you could do this like e.g.
if(Mathf.Abs(moveHorizontal) > 0.1f)
{
...
}
else
{
var vel = rb2D.velocity;
vel.x = 0;
rb2D.velocity = vel;
}

How to flip character when moving left unity 2D

I am trying to flip my character sprite when moving left in my game, and I have followed multiple tutorials however my sprite does not seem to flip. It is always facing the same way.
Below is my code for my character's movement. I have created a Flip() function and 2 if statements used to call the function. The character can move left, right, up and down (no jumping).
I cannot seem to see where an error would be and why it is not flipping, so any help would be appreciated. thank you.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerMovement : MonoBehaviour
{
// Start is called before the first frame update
private Animator animate;
public float moveSpeed = 6f;
bool facingRight = true;
public Rigidbody2D rb;
Vector2 movement;
private void Start()
{
animate = gameObject.GetComponent<Animator>();
}
// Update is called once per frame
void Update()
{
movement.x = Input.GetAxisRaw("Horizontal");
movement.y = Input.GetAxisRaw("Vertical");
animate.SetFloat("Speed", Mathf.Abs(movement.x));
if(movement.x < 0 && facingRight)
{
Flip();
}
else if (movement.x > 0 && !facingRight)
{
Flip();
}
}
void FixedUpdate()
{
rb.MovePosition(rb.position + movement * moveSpeed * Time.fixedDeltaTime);
}
void Flip()
{
Vector3 currentScale = gameObject.transform.localScale;
currentScale.x *= -1;
gameObject.transform.localScale = currentScale;
facingRight = !facingRight;
}
}
Updated code:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerMovement : MonoBehaviour
{
// Start is called before the first frame update
private Animator animate;
public float moveSpeed = 6f;
bool facingRight = true;
public Rigidbody2D rb;
Vector2 movement;
private void Start()
{
animate = gameObject.GetComponent<Animator>();
}
// Update is called once per frame
void Update()
{
movement.x = Input.GetAxisRaw("Horizontal");
movement.y = Input.GetAxisRaw("Vertical");
animate.SetFloat("Speed", Mathf.Abs(movement.x));
if (movement.x < 0 && facingRight)
{
GetComponent<SpriteRenderer>().flipX = true;
}
else if (movement.x > 0 && !facingRight)
{
GetComponent<SpriteRenderer>().flipX = false;
}
}
void FixedUpdate()
{
rb.MovePosition(rb.position + movement * moveSpeed * Time.fixedDeltaTime);
}
void Flip()
{
Vector3 currentScale = gameObject.transform.localScale;
currentScale.x *= -1;
gameObject.transform.localScale = currentScale;
facingRight = !facingRight;
}
}

Try to set the flipX property of the SpriteRenderer.
GetComponent<SpriteRenderer>().flipX = true;
You have an animator attached to the game object, if the scale value is controlled by the animation clip, you cannot change it. A typical workaround is give the game object an empty parent and change its scale.
Player <---- Change scale here
Model <---- Animator here

transform.Rotate(0f, 180f, 0f); you have to change y while fliping
will work better instead of using currentScale.x *= -1;
gameObject.transform.localScale = currentScale;
This code worked for me
private void Flip()
{
// Rotate the player
if (transform.localEulerAngles.y != 180 && !facingRight)
transform.Rotate(0f, 180f, 0f);
else if(transform.localEulerAngles.y != 0 && facingRight)
transform.Rotate(0f, -180f, 0f);
// player flip point of attck also flip is direction
//transform.Rotate(0f, 180f, 0f);
}

if (Input.GetKeyDown(KeyCode.LeftArrow))
{
GetComponent<SpriteRenderer>().flipX = true;
isLookingRight = false;
}
if (Input.GetKeyDown(KeyCode.RightArrow))
{
GetComponent<SpriteRenderer>().flipX = false;
isLookingRight = true;
}
Going to right
Going to left

Unity 2D - Moving Any Object Between Two (or more) Spaces

new Unity person, and new coder in general. I'm trying to have an object move back and forth between two spots. I have it right now going from Point 1 to Point 2, but it stops. I tried a do loop, and to call back the Move() function again but it just froze Unity.
I'm guessing I need some sort of Loop, but not sure where to do it? I wouldn't mind having the ability to add more spots as well. I have waypoints in Unity itself, tied to the Object. Thanks!
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ZombiePathing : MonoBehaviour
{
[SerializeField] List<Transform> waypoints;
[SerializeField] float moveSpeed = 2f;
int waypointIndex = 0;
void Start()
{
transform.position = waypoints[waypointIndex].transform.position;
}
// Update is called once per frame
void Update()
{
Move();
}
private void Move()
{
if (waypointIndex <= waypoints.Count -1)
{
var targetPosition = waypoints[waypointIndex].transform.position;
var movementThisFrame = moveSpeed * Time.deltaTime;
transform.position = Vector2.MoveTowards
(transform.position, targetPosition, movementThisFrame);
if (transform.position == targetPosition)
{
waypointIndex++;
}
}
}
}

just add an index equal to 1 or -1 depends on the current transform,
I wrote this code very quickly so it's unsorted, and I do my best to make it very close to your code with some edits.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ZombiePathing : MonoBehaviour
{
[SerializeField] List<Transform> waypoints;
[SerializeField] float moveSpeed = 2f;
Vector3 targetPosition;
int waypointIndex = 0;
int index = 1;
void Start()
{
transform.position = waypoints[waypointIndex].position;
UpdateTransform();
}
void Update()
{ transform.position = Vector2.MoveTowards
(transform.position, targetPosition, moveSpeed * Time.deltaTime);
if (transform.position == targetPosition) UpdateTransform();
}
private void UpdateTransform()
{
waypointIndex += index;
targetPosition = waypoints[waypointIndex].position;
if (waypointIndex >= waypoints.Count -1) index = -1;
else if (waypointIndex <= 0 && index == -1)index = 1;
}
}

How can i make my prefab completely reverse (180 degrees) from it's spawnpoint? Unity 2D

So i made a little side scroller that uses a prefab to spawn bullets.
My problem is that it only shoots to one side... the Right.
I need it to fire to the left as well. I've already made a variable to see if the player is looking to the right or left.
I've tried to put the Speed to -20 and i've tried to rotate it 180 degrees on it's Z axis. I tested if the bullet script even picked up the change from the player movement script and it does.
Player Movement script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerMovement : MonoBehaviour
{
public GameObject bullet;
private Rigidbody2D myRigidbody;
private float speed = 15;
private bool facingRight;
private bool ground = false;
private float jump = 23;
// Start is called before the first frame update
void Start()
{
facingRight = true;
myRigidbody = GetComponent<Rigidbody2D>();
}
// Update is called once per frame
void FixedUpdate()
{
float horizontal = Input.GetAxis("Horizontal");
Movement(horizontal);
Flip(horizontal);
if (Input.GetKey("w"))
{
if (ground)
{
GetComponent<Rigidbody2D>().velocity = new Vector2(GetComponent<Rigidbody2D>().velocity.x, jump);
}
}
if(facingRight == false)
{
bullet.GetComponent<bullet>().left = true;
}
if (facingRight == true)
{
bullet.GetComponent<bullet>().left = false;
}
}
void OnTriggerEnter2D()
{
ground = true;
}
void OnTriggerExit2D()
{
ground = false;
}
private void Movement(float horizontal)
{
myRigidbody.velocity = new Vector2(horizontal * speed,myRigidbody.velocity.y);
}
private void Flip(float horizontal)
{
if (horizontal > 0 && !facingRight || horizontal < 0 && facingRight)
{
facingRight = !facingRight;
Vector3 theScale = transform.localScale;
theScale.x *= -1;
transform.localScale = theScale;
}
}
}
Weapon script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class weapon : MonoBehaviour
{
// Start is called before the first frame update
public bool right;
public Transform firepointR;
public GameObject bulletPrefab;
// Update is called once per frame
void Update()
{
if (Input.GetKeyDown("space"))
{
Debug.Log("Oh well");
Shoot();
}
}
void Shoot()
{
Instantiate(bulletPrefab, firepointR.position, firepointR.rotation);
}
}
bullet script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class bullet : MonoBehaviour
{
public bool left;
public float speed = 20;
public Rigidbody2D rb;
// Start is called before the first frame update
void Start()
{
rb.velocity = transform.right * speed;
}
// Update is called once per frame
void FixedUpdate()
{
Debug.Log(speed);
if (left == false)
{
transform.Rotate(0, 0, 180);
}
}
}
As i previously said i need my bullet (prefab) to go the opposite direction but whatever i do right now it will always go right.

Expanding on my comment:
Did you try reversing the velocity?
rb.velocity = -(transform.right * speed);
Note: There are instances when using a negative float wont return the opposite of the positive result. However, in this example, it will work just fine.
I imagine this will work also (and is probably the correct way of doing it):
rb.velocity = transform.left * speed;

My character is animating but still not moving

I am just starting out with unity and am also making a game for a school project. My 2d game character can do the walk animation when I press the "a" and "d" keys and the sprite flips, but it stays in the same position. Below is my PlayerController script
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerController : MonoBehaviour
{
private float speed = 3f;
private Animator anim;
private SpriteRenderer sr;
// Start is called before the first frame update
void Awake()
{
anim = GetComponent<Animator>();
sr = GetComponent<SpriteRenderer>();
}
// Update is called once per frame
void Update()
{
Move();
}
void Move()
{
float h = Input.GetAxisRaw("Horizontal");
Vector3 temp = transform.position;
if (h > 0)
{
temp.x += speed * Time.deltaTime;
sr.flipX = true;
anim.SetBool("Walk", true);
}
else if (h < 0)
{
temp.x -= speed * Time.deltaTime;
sr.flipX = false;
anim.SetBool("Walk", true);
}
else if (h == 0)
{
anim.SetBool("Walk", false);
}
}
}

You're setting 'temp' to equal transform.position, but that doesn't mean that transform.position equals 'temp'. Here, the below script should give you what you want
using UnityEngine;
public class PlayerController : MonoBehaviour
{
private float speed = 3f;
private Animator anim;
private SpriteRenderer sr;
void Awake()
{
anim = GetComponent<Animator>();
sr = GetComponent<SpriteRenderer>();
}
void Update()
{
Move();
}
void Move()
{
float h = Input.GetAxisRaw("Horizontal");
transform.Translate(Vector2.right * (h * speed * Time.deltaTime));
anim.SetBool("Walk", h != 0f);
if (anim.GetBool("Walk"))
Flip(h > 0f);
}
void Flip(bool facingRight)
{
sr.flipX = !facingRight;
}
}