Mouse aiming problem

Unity Engine
1 
using UnityEngine;

public class CharcterMovment : MonoBehaviour
{
    public float MovmentSpeed = 2f;

    public Rigidbody2D rb;
    Vector2 Movment;
    public Camera cam;

    Vector2 movePos;
    Vector2 mousePos;

    void Update()
    {
        Movment.x = Input.GetAxisRaw("Horizontal");
        Movment.y = Input.GetAxisRaw("Vertical");

        mousePos = Camera.main.WorldToScreenPoint(Input.mousePosition);
    }

    void FixedUpdate()
    {
        rb.MovePosition(rb.position + Movment * MovmentSpeed * Time.fixedDeltaTime);

        Vector2 LookDir = mousePos - rb.position;
        float angle = Mathf.Atan2(LookDir.y, LookDir.x) * Mathf.Deg2Rad;
        rb.rotation = angle;
    }
}

The rotation is acting weird and I have tried to fix it but no success help will ve much appriciated

here is a video that show what’s happening when I try to use it:

2 
float angle = Mathf.Atan2(LookDir.y, LookDir.x) * Mathf.Deg2Rad;

Should be.

float angle = Mathf.Atan2(LookDir.y, LookDir.x) * Mathf.Rad2Deg;

You’re accidentally trying to take radians and convert them from degrees back to radians.

Oh and you should zero out the z of the mouse position after converting it to world position, I find that messes with things.

1 Like
3

ok I will try it

4

where do i need to set the Z to 0 because in Atan2 you can only put two arguments

5

Right here in update.

mousePos = Camera.main.WorldToScreenPoint(Input.mousePosition);
mousePos.z = 0f;
6

the mousePos is vector two as well so mousePos.z is not a thing

7

Ah alright, didn’t see that. So is it working for you?

8

still no

9

Maybe normalize LookDir.

Vector2 LookDir = mousePos - rb.position;
LookDir.Normalize();

It’s a pretty simple piece of math not sure why it isn’t working right. I have this in quite a few projects and it works every time.

10

It still doesn’t work

This is the character properties maybe it have something to do with that

6715894--772183--Capture.PNG
6715894--772183--Capture.PNG360Ă—507 12 KB

11

yo tengo un fallo en float con Atan2, dice que no esta añadido o que hace falta una directva “using”

12

The complete error message contains everything you need to know to fix the error yourself.

The important parts of the error message are:

  • the description of the error itself (google this; you are NEVER the first one!)
  • the file it occurred in (critical!)
  • the line number and character position (the two numbers in parentheses)
  • also possibly useful is the stack trace (all the lines of text in the lower console window)

Always start with the FIRST error in the console window, as sometimes that error causes or compounds some or all of the subsequent errors. Often the error will be immediately prior to the indicated line, so make sure to check there as well.

All of that information is in the actual error message and you must pay attention to it. Learn how to identify it instantly so you don’t have to stop your progress and fiddle around with the forum.

Remember: NOBODY here memorizes error codes. That’s not a thing. The error code is absolutely the least useful part of the error. It serves no purpose at all. Forget the error code. Put it out of your mind.

Tutorials and example code are great, but keep this in mind to maximize your success and minimize your frustration:

How to do tutorials properly, two (2) simple steps to success:

Tutorials are a GREAT idea. Tutorials should be used this way:

Step 1. Follow the tutorial and do every single step of the tutorial 100% precisely the way it is shown. Even the slightest deviation (even a single character!) generally ends in disaster. That’s how software engineering works. Every step must be taken, every single letter must be spelled, capitalized, punctuated and spaced (or not spaced) properly, literally NOTHING can be omitted or skipped.
Fortunately this is the easiest part to get right: Be a robot. Don’t make any mistakes.
BE PERFECT IN EVERYTHING YOU DO HERE!!

If you get any errors, learn how to read the error code and fix your error. Google is your friend here. Do NOT continue until you fix your error. Your error will probably be somewhere near the parenthesis numbers (line and character position) in the file. It is almost CERTAINLY your typo causing the error, so look again and fix it.

Step 2. Go back and work through every part of the tutorial again, and this time explain it to your doggie. See how I am doing that in my avatar picture? If you have no dog, explain it to your house plant. If you are unable to explain any part of it, STOP. DO NOT PROCEED. Now go learn how that part works. Read the documentation on the functions involved. Go back to the tutorial and try to figure out WHY they did that. This is the part that takes a LOT of time when you are new. It might take days or weeks to work through a single 5-minute tutorial. Stick with it. You will learn.

Step 2 is the part everybody seems to miss. Without Step 2 you are simply a code-typing monkey and outside of the specific tutorial you did, you will be completely lost. If you want to learn, you MUST do Step 2.

Of course, all this presupposes no errors in the tutorial. For certain tutorial makers (like Unity, Brackeys, Imphenzia, Sebastian Lague) this is usually the case. For some other less-well-known content creators, this is less true. Read the comments on the video: did anyone have issues like you did? If there’s an error, you will NEVER be the first guy to find it.

Beyond that, Step 3, 4, 5 and 6 become easy because you already understand!