.MoveRotation doesn't seem to do anything at all

Unity Engine
,
1

Hello,

I am now trying to use .MoveRotation, but it doesn’t work at all.

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

public class rotate : MonoBehaviour
{
    private Rigidbody2D rb;
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }
    void FixedUpdate()
    {
        rb.MoveRotation(rb.rotation + 90 * Time.fixedDeltaTime);
    }
}

I have tried looking up why this is not doing anything, but from what I can find this should be working like this. Am I doing something wrong, am I missing something or is something else going on?

2

You can not add a float to a quaternion. Check the docu on quaternions :slight_smile:

3

I’d say look at Unity’s example, your code doesn’t even compile.

4

your code should be like this

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class rotate : MonoBehaviour
{
    private Rigidbody2D rb;
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }
    void FixedUpdate()
    {
var rotation = new Vector3(0, 90, 0) // rotating in the y axis
        rb.MoveRotation(rb.rotation + 90 * Time.fixedDeltaTime);
    }
}
5

your code should be like this

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class rotate : MonoBehaviour
{
    private Rigidbody2D rb;
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }
    void FixedUpdate()
    {
        var rotation = new Vector3(0, 90, 0) // rotating in the y axis
        rb.MoveRotation(rb.rotation + rotation * Time.fixedDeltaTime);
    }
}
6

Thanks a lot for your awnsers,

Unfortunately I seem to not be able to make .MoveRotation work.

Kreshi:
I am using a Rigidbody2D component, so it is possible to use a float instead of an quaternion as argument for .MoveRotation. The issue is: even if I make it into a quaternion, it still doesn’t seem to do anything.

Brathnann:
The link you’ve put in your reply is for the Rigidbody component, but I am using a Rigidbody2D component. I am not sure if that matters but here’s the link to that:

From what I know my code is pretty much an exact copy of the example giving by Unity, at least for the rotation.

Also I do not understand what you mean by “your code doesn’t even compile”. I am that good in coding yet, but I would love to learn what you meant with that.

TheDevloper:
I have tried copying the code you made for me, but it gives me te following error:
Assets/Scripts/rotate.cs(14/25): error CS0019: Operator ‘+’ cannot be applied to operands of type ‘float’ and ‘Vector3’
I am pretty sure I get this error because rb.rotation is a float for a Rigidbody2D component, since only the Z-rotation is used. Unfortunately I can’t fix my initial issue by changing “rotation” to a float either.

7

There’s nothing wrong with this code, other than the fact that you are not following the convention for C# classes to use PascalCase names.

Note many of the commenters above are confused and seem to think you’re using a 3D Rigidbody, which you are not.

Your code is completely fine, I would guess that one or more of the following is the actual problem:

  • You haven’t actually attached this script to a GameObject
  • You have one or more compile errors somewhere in your code that you haven’t addressed
  • You haven’t actually run the game
  • The GameObject you attached this script to doesn’t have a Rigidbody2D component on it
  • The GameObject you attached this script to isn’t active or is not even in the scene.
3 Likes
8

Yes, odd, for some reason I thought I saw just a regular Rigidbody and not the 2D one.

2 Likes
9

Hey don’t know if you’re still having issues but I found this thread because I had the same issue. Turned out I had ticked the “Freeze Rotation” box under constraints in the Rigidbody2D component. After unchecking the box it works as predicted.

1 Like
10

I hope almost a year later they aren’t still stuck on this. :smile:

2 Likes