Rigidbody2D drifitng after collision

Questions & Answers
1

Using the following code to control a top down 2D character. Movement works fine until I run into a wall or any object, then it starts to drift without input in a random direction. I’m sure this has something to do with the physics but not sure what.

public class Player : MonoBehaviour {

	public Transform target;
	public float speed;
	public Text healthDisplay;
	public int health = 10;
	public bool isRunning = false;
	public float RunSpeed;
	public float NormalSpeed;
	private Rigidbody2D rb;
	private Vector2 moveVelocity;

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

	void Update(){

		//healthDisplay.text = "HEALTH: " + health;
		if(health <= 0){
			SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
		}

		//Player faces mouse direction
		Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        transform.rotation = Quaternion.LookRotation(Vector3.forward, mousePos - transform.position);
	}

	void FixedUpdate(){

		//Normal movement 
		Vector2 moveInput = new Vector2(Input.GetAxis("Horizontal"), Input.GetAxis("Vertical"));
		moveVelocity = moveInput.normalized * speed;
		rb.MovePosition(rb.position + moveVelocity * Time.fixedDeltaTime);

		//Sprinting
		if(Input.GetKey(KeyCode.LeftShift)){
			isRunning = true;
			speed = RunSpeed;
		} else {
			isRunning = false;
			speed = NormalSpeed;
		}
	}

}
2

I modified your script (I removed the part of your code that doesn’t have to do with movement, but you can add that back in later). I changed you rigidbody operation to use velocity rather than MovePosition. Also, I do NOT set the value of speed in the inspector. Speed is automatically set by your code. It’s either equal to normal speed or running speed. Tell me what you think:

using UnityEngine;

public class Player : MonoBehaviour
{

    public float speed;

    public float RunSpeed;
    public float NormalSpeed;

    private Rigidbody2D rb;

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

    void Update()
    {
        Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        transform.rotation = Quaternion.LookRotation(Vector3.forward, mousePos - transform.position);

        if (Input.GetKey(KeyCode.LeftShift))
        {
            speed = RunSpeed;
        }
        else
        {
            speed = NormalSpeed;
        }
    }

    void FixedUpdate()
    {
        float horizontal = Input.GetAxis("Horizontal");
        float vertical = Input.GetAxis("Vertical");
        Vector2 movement = new Vector2(horizontal, vertical);
        rb.velocity = movement * speed;
    }

}
3

Figured it out, turns out I needed to check the Freeze Rotation box under my character’s Rigidbody 2D