Simple first-person controller

extends CharacterBody3D

@onready var camera = $Cam/Camera3D
@onready var cam = $Cam

const MOUSE_SENSITIVITY = 0.25
const GRAVITY = -20.0
const JUMP_SPEED = 7
const SPEED = 6
const ACCEL = 12.0

var vel = Vector3.ZERO
var currentvel = Vector3.ZERO
var dir = Vector3.ZERO

func _ready():
    Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED)

func _physics_process(delta):
    dir = Vector3.ZERO
    if Input.is_action_pressed("forward"):
        dir -= camera.global_transform.basis.z
    if Input.is_action_pressed("back"):
        dir += camera.global_transform.basis.z
    if Input.is_action_pressed("left"):
        dir -= camera.global_transform.basis.x
    if Input.is_action_pressed("right"):
        dir += camera.global_transform.basis.x

    dir = dir.normalized()

    var target_vel = dir * SPEED

    currentvel = currentvel.lerp(target_vel, ACCEL * delta)

    vel.x = currentvel.x
    vel.z = currentvel.z
    vel.y += GRAVITY * delta

    if Input.is_action_just_pressed("jump") and is_on_floor():
        vel.y = JUMP_SPEED

    set_velocity(vel)
    move_and_slide()

func _input(event):
    if event is InputEventMouseMotion:
        cam.rotate_x(deg_to_rad(event.relative.y * -MOUSE_SENSITIVITY))
        cam.rotation_degrees.x = clamp(cam.rotation_degrees.x, -70, 45)
        self.rotate_y(deg_to_rad(event.relative.x * -MOUSE_SENSITIVITY))

#RAGDEV