Top-down sprite "jitters" when moving and shootin

Unity Engine
,
1

Hi,

I have just started using Unity due to some inspiration for a top-down game.

I have implemented a basic player controller, where you can move in both x-y directions as well as rotate the sprite towards the cursor and a shooting mechanic as well (thanks to Brackeys).

One problem I have encountered is that whenever I move and shoot at the same time the sprite “jitters”, what I can see is that the rotation for the player-gameobject is constantly changing in very small increments around the current rotation value, but after shooting it just returns to the original value like nothing happened. I can’t for the life of me figure out what is going on since the player’s rigidbody is never accessed in the shooting-script.

The bullet in question is instantiated at a FirePoint in front of the character and it has no rigidbody so the bullet can’t collide with the FirePoint.

Some help would be appreciated!

// Brackeys top-down controller
public class PlayerController : MonoBehaviour
{

    public float moveSpeed = 5f;

    public Rigidbody2D rb;
    public Camera cam;

    Vector2 movement;
    Vector2 mousePos;

    // Update is called once per frame
    void Update()
    {
        movement.x = Input.GetAxisRaw("Horizontal");
        movement.y = Input.GetAxisRaw("Vertical");

        mousePos = cam.ScreenToWorldPoint(Input.mousePosition);
    }

    void FixedUpdate()
    {
        rb.MovePosition(rb.position + movement * moveSpeed * Time.fixedDeltaTime);

        Vector2 lookDir = mousePos - rb.position;
        float angle = Mathf.Atan2(lookDir.y, lookDir.x) * Mathf.Rad2Deg + 90f;
        rb.rotation = angle;
    }
}

public class Weapon : MonoBehaviour
{
    public Transform firePoint;
    public GameObject bullet;

    // Update is called once per frame
    void Update()
    {
        if (Input.GetButtonDown("Fire1"))
        {
            Shoot();
        }
    }

    void Shoot()
    {
        Instantiate(bullet, firePoint.position, firePoint.rotation);
    }
}

public class Bullet : MonoBehaviour
{
    public float speed = 5f;
    public Rigidbody2D rb;

    // Start is called before the first frame update
    void Start()
    {
        rb.velocity = transform.right * speed;
    }

   
     void OnTriggerEnter2D(Collider2D collision)
    {
       Destroy(gameObject);
    } 


    void OnBecameInvisible()
    {
        Destroy(gameObject);
    }

}
2

But if the bullet has a collider, then player can collide with it and jitter.

Eliminate that by removing the collider from the bullet. If it fixes it, then you can look into using physics layers to prevent your bullets from ever colliding with you. If it doesn’t fix the problem, put the collider back and move onto the next theory.