[Solved] Rigidbody2d smooth movement

Unity Engine
1

Hello. I am new to Unity.
I have a question about the movement of Rigidbody2D.
I add a sprite with Rigidbody2D to the 2d scene.

Player movement script:

    private Vector2 movement;
    private Rigidbody2D rb;

    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    void Update()
    {
        movement = new Vector2(Input.GetAxisRaw("Horizontal"), Input.GetAxisRaw("Vertical"));
    }

    private void FixedUpdate()
    {
        rb.AddForce(movement * 4000 * Time.fixedDeltaTime);
    }

Script on camera:

    private GameObject player;

    void Start()
    {
        player = GameObject.FindWithTag("Player");
    }

    void Update()
    {
        Vector3 moveTo = new Vector3(player.transform.position.x, player.transform.position.y, -10f);
        transform.position = Vector3.Lerp(transform.position, moveTo, 10.0f * Time.deltaTime);
    }

When I start the game, the player moves with shaking, not smoothly. How to avoid this?
Thanks.

2

Enabling interpolation for Rigidbody2D and increasing the values of Linear Drag and Angular Drag solved the problem. In addition, you must include your sprite in the Player object as a child and rotate it if necessary (for example, rotate to a crosshair).

3

The reason you’re having to scale the force up so much is because you’re scaling it down by the fixed delta-time. You don’t need to do this because the force you specify here will be time-integrated when it’s applied during the simulation step.

In other words, the force you specify is being time-integrated (reduced) twice.

1 Like
4

Yes you are right. I also deleted the delta

1 Like