Unity Player Walk

PlayerWalk.cs

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

public class PlayerWalk : MonoBehaviour
{
    // Start is called before the first frame update
    [Header("Walking")]
    [SerializeField] private float walkSpeed = 10f;
    [SerializeField] private float jumpPower = 1f;
    [SerializeField] private float grav = -9.81f;
    [SerializeField] private CharacterController _controller;
    private Vector3 _velocity = Vector3.zero;
    
    
    [Header("Camera Movement")]
    [SerializeField] private float mouseSensitivity = 100f;
    [SerializeField] public Transform cameraTransform;
    public bool shouldCameraLook = true; // In case another script (like pause menu) wants to disable camera look
    private float _xRot = 0f;
    private bool isMoving = false;

    [Header("Head Bob")] 
    [SerializeField] private bool doHeadbob = true;
    [SerializeField] private float headBobSpeed = 0.15f;
    [SerializeField] private float headBobAmt = 0.05f;
    private float startY;
    private float startX;
    private float time;

    [Header("Core")] public bool shouldMove = true;
    void Start()
    {
        _controller = GetComponent<CharacterController>();
        startY = cameraTransform.localPosition.y;
        startX = cameraTransform.localPosition.x;

    }

    // Update is called once per frame

    void HeadbobMovement()
    {
        if (!_controller.isGrounded || !doHeadbob) return; // Head bob while jumping is stoopid

        if (isMoving)
        {
            time += Mathf.Clamp(Time.deltaTime, 0, 1) + headBobSpeed;
            cameraTransform.localPosition = new Vector3(
                startX + Mathf.Cos(time * headBobSpeed / 2) * headBobAmt,
                startY + Mathf.Sin(time * headBobSpeed) * headBobAmt * 2,
                cameraTransform.localPosition.z // Rider stfu nobody asked
            );

        }
        
    }
    
    void WalkMovement()
    {
        if (_controller.isGrounded && _velocity.y < 0f)
        {
            _velocity.y = -2f;
        }

        float wSpeed = walkSpeed;
        if (Input.GetKey(KeyCode.LeftShift))
        {
            wSpeed += 2f;
        }

        float x = Input.GetAxis("Horizontal") * wSpeed * Time.deltaTime;
        float z = Input.GetAxis("Vertical") * wSpeed * Time.deltaTime;
        
        Vector3 move = new Vector3(x, 0f, z);
        
        if (_controller.isGrounded && Input.GetButtonDown("Jump"))
        {
            _velocity.y += Mathf.Sqrt(jumpPower * -2f * grav);
        }
        
        _velocity.y += grav * Time.deltaTime;

        Vector3 moveRes = (_velocity * Time.deltaTime) + transform.TransformDirection(move);
        _controller.Move(moveRes);
        
        isMoving = _controller.velocity.magnitude > 0f;
    }
    
    void Update()
    {
        if (!shouldMove)
        {
            Cursor.lockState = CursorLockMode.None;
            return;
        }
        
        Cursor.lockState = CursorLockMode.Locked;
        
        CameraMovement();
        WalkMovement();
        HeadbobMovement();
    }

    void CameraMovement()
    {
        if (shouldCameraLook)
            Cursor.lockState = CursorLockMode.Locked;
        else
        {
            Cursor.lockState = CursorLockMode.None;
            return;
        }

        float mouseX = Input.GetAxis("Mouse X") * mouseSensitivity * Time.fixedDeltaTime;
        float mouseY = Input.GetAxis("Mouse Y") * mouseSensitivity * Time.fixedDeltaTime;

        _xRot -= mouseY;
        _xRot = Mathf.Clamp(_xRot, -90f, 90f);
        
        transform.Rotate(Vector3.up * mouseX);
        cameraTransform.localRotation = Quaternion.Euler(_xRot, 0f, 0f);
    }
}