Can't rotate object towards the mouse (2d)

Unity Engine
,
1

i’m trying to shoot towards the mouse and i’m using this set up
9767181--1399236--upload_2024-4-12_20-2-58.png

the rotate thing has this function that i call every update

private void AimMouse()
    {
        Vector3 cursorPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        Vector2 direction = cursorPos - transform.position;
        float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
        Quaternion rotation = Quaternion.AngleAxis(angle, Vector3.forward);
        transform.rotation = Quaternion.Slerp(transform.rotation, rotation, 1);
        // i've also tryed transform.rotation = Quaternion.Euler(new(0,0,angle)) and
       //Quaternion.angleAxis(angle,Vector3.forward)
    }

but the result is this:
q9j91b

2

You can short circuit a lot of this just by subtracting the two positions (object from mouse) and setting the result into either the transform.right or transform.up field of the pointer.

Vector2 delta = cursorPos - transform.position;

transform.right = delta;

Change .right to .up perhaps if your pointer points up naturally.

You might want to guard the above code from running if you think delta could be (0,0,0)

1 Like
3

i’ll try ty for the reply

4 
private void AimMouse()
{
    Vector3 cursorPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
    Vector2 direction = cursorPos - transform.position;
    transform.right = direction;
}

it still gives me the same error T^T
i also tryed transform.up

5

You say this is 2D in your title, but is it X/Y ??

Perhaps it is X/Z and you should be setting the transform.forward?

Generally when you say 2D in Unity you are referring to the X/Y plane.

6 
Vector3 direction=new Vector3(Input.mousePosition.x-Screen.width/2,0,Input.mousePosition.y-Screen.height/2);
transform.right=direction;
7

yeah X/Y
9767331--1399299--upload_2024-4-12_21-28-39.png
but also the map in 3d cause my classmates made it like that

8

Well in that case what I wrote above works, so start debugging it.

Maybe you’re not using the transform you think you are.

Print out the two vector inputs, figure it out.

9

yup it was as you said the problem was that the cam was offset by -18 in the y so all i had to do was to add 18 to the y of the mouse position