Bug How can I stop my ball from moving sideways when it turns?

I'm making a third person game where you roll a ball around, and have gotten some help in coding it. I'm not very good at it though, and I came across an issue where the ball you play as moves to the sides when you turn it. Here's the code.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class BallControl : MonoBehaviour
6. {
7.     public float speed = 10f;
8.     public float rotationSpeed = 100f;
9.     public Camera mainCamera;
10.  
11.     private Rigidbody rb;
12.  
13.     private void Start()
14.     {
15.         rb = GetComponent<Rigidbody>();
16.     }
17.  
18.     private void FixedUpdate()
19.     {
20.         float horizontalInput = Input.GetAxis("Horizontal");
21.         float verticalInput = Input.GetAxis("Vertical");
22.  
23.         Vector3 movement = mainCamera.transform.forward * verticalInput + mainCamera.transform.right * horizontalInput;
24.         movement.y = 0f; // remove the vertical component
25.         movement = Quaternion.AngleAxis(mainCamera.transform.rotation.eulerAngles.z, mainCamera.transform.forward) * movement;
26.  
27.         rb.AddForce(movement.normalized * speed);
28.  
29.         if (movement != Vector3.zero)
30.         {
31.             Quaternion targetRotation = Quaternion.LookRotation(movement);
32.             Quaternion newRotation = Quaternion.RotateTowards(rb.rotation, targetRotation, rotationSpeed * Time.fixedDeltaTime);
33.             rb.MoveRotation(newRotation);
34.  
35.             // Update the ball's rotation to match the camera's rotation
36.             Vector3 cameraForward = mainCamera.transform.forward;
37.             cameraForward.y = 0f;
38.             Quaternion cameraRotation = Quaternion.LookRotation(cameraForward);
39.             transform.rotation = Quaternion.Euler(0, mainCamera.transform.rotation.eulerAngles.y, 0);
40.         }
41.     }
42. }

Please help?

 

How is your camera controlled?

 

or do you want the ball to actually rotate?
then https://docs.unity3d.com/ScriptReference/Rigidbody.AddTorque.html

 

Sorry for taking a while to respond.
The camera moves by being parented to an empty gameobject, which is parented to the ball. The gameobject then uses this script:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class CameraFollow : MonoBehaviour
6. {
7.     public Transform target;
8.     public Vector3 offset;
9.     public float rotationSpeed = 1f;
10.  
11.     private float currentRotationAngle = 0f;
12.  
13.     private void LateUpdate()
14.     {
15.         // Update the position of the target object to match the ball's position
16.         transform.position = target.position + offset;
17.  
18.         // Rotate the camera around the ball based on A and D input
19.         float rotationInput = Input.GetAxis("Horizontal");
20.         currentRotationAngle += rotationInput * rotationSpeed;
21.         Quaternion rotation = Quaternion.Euler(0f, currentRotationAngle, 0f);
22.         transform.position = target.position + rotation * offset;
23.  
24.         // Ensure that the target object does not roll with the ball
25.         transform.rotation = Quaternion.Euler(0f, currentRotationAngle, 0f);
26.     }
27. }
28.  

 

You're using the same Horizontal Input for both of them. Just don't use it on the ball if you don't want it to move.

 

Thanks, ball turns how I wanted it now :>