CatlikeCoding-Unity/Assets/Scripts/MovingSphere.cs

using UnityEngine;

public class MovingSphere : MonoBehaviour
{
    [SerializeField, Range(0f, 100f)]
    private float maxSpeed = 10f;

    [SerializeField, Range(0f, 100f)]
    private float maxAcceleration = 10f;
    
    private Rigidbody body;

    private Vector3 desiredVelocity;

    private void Awake()
    {
        body = GetComponent<Rigidbody>();
    }

    private void Update()
    {
        Vector2 playerInput;
        playerInput.x = Input.GetAxis("Horizontal");
        playerInput.y = Input.GetAxis("Vertical");
        playerInput = Vector2.ClampMagnitude(playerInput, 1f);
        desiredVelocity = new Vector3(playerInput.x, 0f, playerInput.y) * maxSpeed;
    }

    private void FixedUpdate()
    {
        var velocity = body.velocity;
        float maxSpeedChange = maxAcceleration * Time.deltaTime;
        velocity.x = Mathf.MoveTowards(velocity.x, desiredVelocity.x, maxSpeedChange);
        velocity.z = Mathf.MoveTowards(velocity.z, desiredVelocity.z, maxSpeedChange);
        body.velocity = velocity;
    }
}