SimpleThirdPersonController

PlayerController.cs

using UnityEngine;

public class PlayerController : MonoBehaviour
{
    [SerializeField] private float maxSpeed = 7f; // meter per second
    [SerializeField] private float acceleration = 20f;
    [SerializeField] private float maxRotation = 600f; // degree

    [Space]
    [SerializeField] private Vector3 velocity;
    [SerializeField] private Vector3 move;
    
    [Space]
    [SerializeField] private Camera playerCamera;

    // new input system
    private MyControls input;
    private MyControls.PlayerActions player;

    private new Rigidbody rigidbody;

    void Awake()
    {
        input = new MyControls();
        player = input.Player;
    }

    void Start()
    {
        rigidbody = GetComponent<Rigidbody>();
        if (playerCamera is null)
        {
            playerCamera = FindObjectOfType<Camera>();
        }
        input.Enable();
    }


    void Update()
    {
        var value = player.Move.ReadValue<Vector2>();
        move = playerCamera.transform.TransformDirection(new Vector3(value.x, 0, value.y));
        velocity = Vector3.MoveTowards(velocity, move * maxSpeed, acceleration * Time.deltaTime);
    }

    void FixedUpdate()
    {
        // if use rigidbody:
        rigidbody.velocity = velocity;
        // else if change transform position directory:
        // transform.position += new velocity * Time.delaTime;

        var dir = transform.InverseTransformDirection(move);
        var r = Mathf.Atan2(dir.x, dir.z) * Mathf.Rad2Deg;
        r = Mathf.MoveTowards(0, r, maxRotation * Time.deltaTime);
        transform.Rotate(0, r, 0);

    }
}