some 3d character controller script for godot engine

Player.gd

extends CharacterBody3D

## forward/backward speed
@export var zSpeed = 320
## left/right speed (strafe)
@export var xSpeed=380.5
## speed downwards when falling
@export var ySpeed = 275
## mouse sentitivity for horizontal mouse movement (player rotation around Y)
@export var mouseHSensitivity=0.1
## mouse sensitivity for vertical mouse movement (camera rotation around X)
@export var mouseVSensitivity=0.1
## maximum vertical camera rotation 
@export var cameraRotMax=0.1
## minimum vertical camera rotation
@export var cameraRotMin=-1.2

## If is no more mouse movement after this number of seconds, mouse inputs is reset.
## This prevents the camera from rotating endlessly.
@export var mouseResetDelay=0.1	

var camPivot:Marker3D # "$CameraPivot" holds the camera
var pivot:Marker3D    # "$Pivot" holds the mesh

var yRot:int
var xRot:int
var noMouseInputSince:float

func _ready():
	Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
	camPivot=($CameraPivot as Marker3D)
	pivot=$Pivot

func _input(event):
	if event is InputEventMouseButton:
		if event.button_index==1:
			Input.mouse_mode = Input.MOUSE_MODE_CAPTURED
			
	if event is InputEventMouseMotion:
		yRot=-event.relative.x*mouseHSensitivity
		xRot=-event.relative.y*mouseVSensitivity
		noMouseInputSince=0
	
	if event is InputEventKey:
		if event.physical_keycode==KEY_ESCAPE:
			Input.mouse_mode = Input.MOUSE_MODE_VISIBLE
			
func dirX():
	if Input.is_action_pressed("move_right"):
		return 1
	if Input.is_action_pressed("move_left"):
		return -1
	return 0
	
func dirZ():
	if Input.is_action_pressed("move_back"):
		return 1
	if Input.is_action_pressed("move_forward"):
		return -1
	return 0
	
func resetMouseInput(delta):
	noMouseInputSince+=delta
	if noMouseInputSince>mouseResetDelay:
		yRot=0
		xRot=0	
		
func applyMouseInput(delta):
	rotation.y+=yRot*delta
	camPivot.rotation.x+=xRot*delta
	camPivot.rotation.x=clampf(camPivot.rotation.x,cameraRotMin,cameraRotMax)
	
func applyMovement(delta):
	var vx = transform.basis.x * dirX() * xSpeed * delta
	var vz = transform.basis.z * dirZ() * zSpeed * delta
	velocity = vx+vz
	
func _physics_process(delta):
	resetMouseInput(delta)
	
	if not is_on_floor(): 
		velocity.y = -ySpeed * delta
		move_and_slide()
	else:
		applyMovement(delta)
		applyMouseInput(delta)
		move_and_slide()