Why is my player sliding (Unity 2D)

Unity Engine
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1

Hi guys im making a 2d platformer and im having some trouble with stopping the player from sliding forwards when i stop pressing a key?
heres my movement script if you could help that would be great

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerMovement : MonoBehaviour
{
public float moveSpeed;
public float jumpForce;
private Rigidbody2D rb2d;
public Animator animator;

    void Start()
    {
        rb2d = GetComponent<Rigidbody2D>();
    }

    void Update()
    {
        animator.SetFloat("Horizontal", Input.GetAxisRaw("Horizontal")) ;
        if (Input.GetKeyDown(KeyCode.Space) && Mathf.Abs(rb2d.velocity.y) < 0.001f)
        {
            rb2d.AddForce(new Vector2 (0, jumpForce), ForceMode2D.Impulse);
        }
    }

    void FixedUpdate()
    {
        float moveInput = Input.GetAxisRaw("Horizontal");
        if (moveInput > 0 && transform.localScale.x < 0) 
        {
            Flip();
        }
        else if (moveInput < 0 && transform.localScale.x > 0)
        {
            Flip();
        }
        rb2d.AddForce(new Vector2(moveInput * moveSpeed, 0));
    }

    void Flip()
    {
        Vector3 currentScale = transform.localScale;
        currentScale.x *= -1;
        transform.localScale = currentScale;
    }
}

Thankyou

2

You can add a physics material with increased friction to the player’s collider. Eventually you may find it better to have multiple colliders on your player so then you can have a collider at the player’s feet with lots of friction and a collider on the body with no friction.

When you increase friction you’ll need to increase the player’s moveSpeed. You can also decrease the player’s mass to make the player feel lighter and more responsive.

3

Its still sliding and also when i jump and press forward it accelerates massively
if you have any idea of how to fix this Then thankyou

4

Sounds like you wrote a bug… and that means… time to start debugging!

By debugging you can find out exactly what your program is doing so you can fix it.

Use the above techniques to get the information you need in order to reason about what the problem is.

You can also use Debug.Log(...); statements to find out if any of your code is even running. Don’t assume it is.

Once you understand what the problem is, you may begin to reason about a solution to the problem.

5

You can decrease the moveSpeed when the player is no longer on the ground. Take a look at other controller scripts to see how to detect the ground. You’ll probably learn lots from seeing how other people do it.

6

I replicated your problem, and the issue is that when we use the AddForce to move the player, this causes momentum to carry over when the key is released.

Now, I don’t know which option you would like best, but you have a couple based on what you want to accomplish:

  • Try using velocity-based movements instead of physics-based forces. This will give you control and stop the movement immediately.

For example replace in line 36:

rb2d.AddForce(new Vector2(moveInput * moveSpeed, 0));

With:

rb2d.linearVelocity = new Vector2(moveInput * moveSpeed, rb2d.linearVelocity.y);
  • If you still want to use AddForce but want to control the slide after releasing, you can start implementing a drag:

You need additional conditionals, here is what I tried:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
    public float moveSpeed;
    public float jumpForce;
    private Rigidbody2D rb2d;
    public Animator animator;

// Adjust this to control how fast the player stops when not moving
    public float drag = 5f;

    void Start()
    {
        rb2d = GetComponent<Rigidbody2D>();
    }

    void Update()
    {
        // Handle animation parameters
        animator.SetFloat("Horizontal", Input.GetAxisRaw("Horizontal"));

        // Jump input handling
        if (Input.GetKeyDown(KeyCode.Space) && Mathf.Abs(rb2d.velocity.y) < 0.001f)
        {
            rb2d.AddForce(new Vector2(0, jumpForce), ForceMode2D.Impulse);
        }
    }

    void FixedUpdate()
    {
        float moveInput = Input.GetAxisRaw("Horizontal");

        if (moveInput != 0)
        {
            // Apply force for movement
            rb2d.AddForce(new Vector2(moveInput * moveSpeed, 0));
        }
        else
        {
            // Apply custom drag when there's no input
            rb2d.velocity = new Vector2(rb2d.velocity.x * (1 - drag * Time.fixedDeltaTime), rb2d.velocity.y);
        }

        // Handle player flipping based on movement direction
        if (moveInput > 0 && transform.localScale.x < 0)
        {
            Flip();
        }
        else if (moveInput < 0 && transform.localScale.x > 0)
        {
            Flip();
        }
    }

    void Flip()
    {
        Vector3 currentScale = transform.localScale;
        currentScale.x *= -1;
        transform.localScale = currentScale;
    }
}

Let me know if this works for you :slight_smile:

7

Thakyou this worked really well

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