i try this tutorial.and i write this code.
but i can not move left and back.
forward and right is work.
What's wrong?

``````extends KinematicBody
var gravity = -9.8
var velocity = Vector3()
var camera
const SPEED = 6
const ACCELERATION = 3
const DE_ACCELERATION = 5

# Called when the node enters the scene tree for the first time.
camera = get_node("../Camera").get_global_transform()
print(camera.basis)
print(camera.basis)
# Called every frame. 'delta' is the elapsed time since the previous frame.
#func _process(delta):
#   pass

func _physics_process(delta):
var dir = Vector3()

if Input.is_action_pressed("move_fw"):
dir += -camera.basis
if Input.is_action_pressed("move_fb"):
dir += camera.basis
if Input.is_action_pressed("move_r"):
dir += -camera.basis
if Input.is_action_pressed("move_l"):
dir += camera.basis

dir.y = 0
dir = dir.normalized()

velocity.y += delta * gravity

var hv = velocity
hv.y = 0

var new_pos = dir * SPEED
var accel = DE_ACCELERATION

hv = hv.linear_interpolate(new_pos,accel * delta)

velocity.x = hv.x
velocity.z = hv.z

velocity = move_and_slide(velocity,Vector3(0,1,0))
``````

Also, what is 3 × 3 matrix ()? I tried to print.

``````camera = get_node ("../ Camera"). get_global_transform ()
print (camera.basis)
print (camera)
``````

((-1, -0, -0), (-0, 0.951692, 0.307056), (0, 0.307056, -0.951692))
-1, -0, -0, -0, 0.951692, 0.307056, 0, 0.307056, -0.951692-0, 6.91487, -10.1349

where is difference this?
i think this section is value of rotation.
but what are the other section of question mark?
((rotation,?,?) (?, rotation,?) (?,?, rotation))

in Engine

First of all check the names of your actions.

Then if you want to understand matrices read this explanation in the godot documentation.