How to make movement relative to the looking direction?

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How to make movement relative to the looking direction?

Container

extends CharacterBody3D

var speed = 20
@onready var accel = 7

var direction = Vector3()
var movement = Vector3()

func _physics_process(delta):
    ##get keyboard input for moving
    direction = Vector3.ZERO
    var h_rot = global_transform.basis.get_euler().y

    var f_input = Input.get_action_strength("Backward") - Input.get_action_strength("Forward")
    var h_input = Input.get_action_strength("Right") - Input.get_action_strength("Left")

    direction = Vector3(h_input, 0, f_input).rotated(Vector3(0, 1, 0), h_rot).normalized()

    #make it move
    velocity = velocity.lerp(direction * speed, accel * delta)

    move_and_slide()

Sooo, WASD is already based on the direction, but I want to make controls so that you can fly up and down, but I don't know how to make this also directional. If you dont know what I mean, if you look down, and press up, it should move forward, but if you look down and press forward (W), it should move down.

spacecloud

Container
You need to transform the direction by your rotation.

direction = global_transform.basis * Vector3(
    x_input,
    y_input,
    z_input)

Container

And why is the code formatting not working?

Megalomaniak

Container Because you used inline(`) code formatting for a code block(```). I'll edit the OP and fix it, you can then try editing the post to see how I've formatted it for you. You can also use ~~~ instead if that is more convenient for you.

Container

Megalomaniak ah ok thanks

Container

@spacecloud

But how to make it for the x rotation? Now, it only works with the z rotation, so it only works when I tilt the camera on the z axis.

cybereality

You need to use the Basis. Basis is basically a coordinate frame, sort of like the x/y/z arrows. By default (if you haven't rotated anything on parents or children) the negative Z axis is forward. So you can use the Basis Z as forward (or you can use X for right, whatever). You don't need to rotate anything, because the basis is always in the current orientation.

Here is some code from one of my projects.

# at the top
var forward_vec = Vector3.FORWARD
var right_vec = Vector3.RIGHT
var forward = Vector3()
var right = Vector3()

# in the function before you move things
var basis = cam.get_transform().basis
forward = basis.xform(forward_vec)
right = basis.xform(right_vec)

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cybereality
so how to apply this to my code?

Container

cybereality

there seems to be no xform in godot 4

cybereality

You can use forward as the direction:

velocity = velocity.lerp(forward * speed, accel * delta)

cybereality

Check the API, I got it to work but I don't remember how off hand.