Rotating object to face mouse with physics isn't working

Questions & Answers
1

(First time on the forums) So, I want my players ship to face the mouse using physics and it sort of does… I have posted a screenshot below to illustrate the problem

39348-i77cimgpsh-orig.png
39348-i77cimgpsh-orig.png1922×1080 198 KB

My code looks as follows:

using UnityEngine;
using System.Collections;

public class Movement : MonoBehaviour {

	public GameObject thruster;
	
	public float thrust;
	public float torque;
	private float optimalDirection;
	
	public float mouseAngle;
	private float playerRotation;

    float angle;

	void Start() {
		rigidbody2D.centerOfMass = new Vector2(0.0f,0.0f);
	}

	void Update() {
	}

	// Update is called once per frame
    void FixedUpdate()
    {

        //Enables acceleration
        if ((Input.GetAxisRaw("Vertical") > 0) && (Input.GetKey("left shift")))
        {
            rigidbody2D.AddForce((transform.up * Time.deltaTime * thrust) * 1.5f, ForceMode2D.Force);
            thruster.particleEmitter.emit = true;
        }
        else if (Input.GetAxisRaw("Vertical") > 0)
        {
            rigidbody2D.AddForce(transform.up * Time.deltaTime * thrust, ForceMode2D.Force);
            thruster.particleEmitter.emit = true;
        }
        else
        {
            thruster.particleEmitter.emit = false;
        }

        //Allows ship to strave
        rigidbody2D.AddForce(transform.right * Time.deltaTime * (thrust / 2) * Input.GetAxisRaw("Horizontal"), ForceMode2D.Force);

        
        //Mouse rotation
        Vector2 mouse = Camera.main.ScreenToViewportPoint(Input.mousePosition);        //Mouse position
        Vector3 objpos = Camera.main.WorldToViewportPoint(transform.position);        //Object position on screen
        Vector2 relobjpos = new Vector2(objpos.x - 0.5f, objpos.y - 0.5f);              //Set coordinates relative to object
        Vector2 relmousepos = new Vector2(mouse.x - 0.5f, mouse.y - 0.5f) - relobjpos;
        mouseAngle = Vector2.Angle (Vector2.up, relmousepos);    //Angle calculation
        if (relmousepos.x > 0)
            mouseAngle = 360-mouseAngle;

        //sets 2 variables to aid with figuring out which direction to go
        playerRotation = rigidbody2D.rotation;

        //Finds the optimal direction
        optimalDirection = ((((mouseAngle - (playerRotation)) % 360) + 540) % 360) - 180;


        //Makes ships come to a stand still
        if (Mathf.Round(optimalDirection) == 0)
            rigidbody2D.rotation += optimalDirection;

        //Chages velocity when appropriate
        if (Mathf.Round(optimalDirection) > 0 && rigidbody2D.angularVelocity < -5)
            rigidbody2D.angularVelocity = rigidbody2D.angularVelocity / 1.5f;
        if (Mathf.Round(optimalDirection) < 0 && rigidbody2D.angularVelocity > 5)
            rigidbody2D.angularVelocity = rigidbody2D.angularVelocity / 1.5f;

        //Applying torque relative to Optimal_Direction
        if (Mathf.Round(optimalDirection) > 0)
            rigidbody2D.AddTorque(torque * Time.deltaTime);
        if (Mathf.Round(optimalDirection) < 0)
            rigidbody2D.AddTorque(-torque * Time.deltaTime);


    }
}

I’m not sure what the issue is and was hoping for some sort of solution or alternative, the problem is reoccurring with every side however having the mouse at 90, 180, 270 and 360 degrees relative makes it align perfectly

2

EDIT: Fixed the code. This should work if you have a thing in the background with a collider on it.

I personally think you are doing waaaaay too much work. Look at Transform.LookAt
You could just call it and be done. Lerp it if you want for the effects it looks like you’re doing.

Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
RaycastHit hit;
Physics.Raycast(ray, out hit);

if (hit.collider != null)
{
    if (hit.collider.tag == Tags.enemy) {
         transform.LookAt(hit.collider.transform.position);
    } else transform.LookAt(hit.point);
}
3

Transform.LookAt did not provide the desired effect however using the following worked
//Finds the rotation of mouse
Vector3 diff = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
diff.Normalize();
mouseAngle = (Mathf.Atan2(diff.y, diff.x) * Mathf.Rad2Deg)-90;

        //sets 2 variables to aid with figuring out which direction to go
        playerRotation = rigidbody2D.rotation;

        //Finds the optimal direction
        optimalDirection = ((((mouseAngle - (playerRotation)) % 360) + 540) % 360) - 180;

        //Makes ships come to a stand still
        if (Mathf.Round(optimalDirection) == 0)
            rigidbody2D.rotation += optimalDirection;

        //Chages velocity when appropriate
        if (Mathf.Round(optimalDirection) > 0 && rigidbody2D.angularVelocity < -5)
            rigidbody2D.angularVelocity = rigidbody2D.angularVelocity / 1.5f;
        if (Mathf.Round(optimalDirection) < 0 && rigidbody2D.angularVelocity > 5)
            rigidbody2D.angularVelocity = rigidbody2D.angularVelocity / 1.5f;

        //Applying torque relative to Optimal_Direction
        if (Mathf.Round(optimalDirection) > 0)
            rigidbody2D.AddTorque(torque * Time.deltaTime);
        if (Mathf.Round(optimalDirection) < 0)
            rigidbody2D.AddTorque(-torque * Time.deltaTime);