Learn to Code Games Like a Pro

local Players = game:GetService("Players")
local RunService = game:GetService("RunService")
local player = Players.LocalPlayer
local character = player.Character -- player character
local humanoid = character:WaitForChild("Humanoid")
local moveDirection = Vector3.new()
local camera = workspace.CurrentCamera

function updateMovement()
    local forward = camera.CFrame.LookVector
    forward = Vector3.new(forward.X, 0, forward.Z).Unit
    local right = camera.CFrame.RightVector
    
    local moveVector = Vector3.new()
    moveVector = humanoid.MoveDirection
    
    if moveVector.Magnitude > 0 then
        humanoid.WalkSpeed = 16
    end
end

RunService.RenderStepped:Connect(updateMovement)

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour
{
    public float moveSpeed = 5f;
    public float rotationSpeed = 500f;
    
    private CharacterController controller;
    private Transform cameraTransform;
    private Vector3 moveDirection;
    
    void Start()
    {
        controller = GetComponent<CharacterController>();
        cameraTransform = Camera.main.transform;
    }
    
    void Update()
    {
        float horizontalInput = Input.GetAxis("Horizontal");
        float verticalInput = Input.GetAxis("Vertical");
        
        moveDirection = new Vector3(horizontalInput, 0, verticalInput);
        moveDirection = cameraTransform.TransformDirection(moveDirection);
        moveDirection.y = 0;
        
        controller.Move(moveDirection * moveSpeed * Time.deltaTime);
    }
}