4.7.2
Was following a tutorial about state machines by chris tutorials and fond a comment that provided a solution for the problem with switching states when going downhill, I applied it and it got me an error:
@export var raycast_2d: RayCast2D
func state_process(_delta):
if raycast_2d.get_collider()==null:
playback.travel(jump())
next_state = charairstate
Since it’s an @export variable, you need to go to the inspector in Godot and actually select your RayCast2D node, otherwise it’s going to be null.
Maybe you want to use "jump" or your variable jump_animation instead of calling the function jump()
You haven’t shown us any code using current_state, chances are you need to fill in another @export variable through the editor.
Make sure to paste code instead of screenshots
extends State
class_name groundstate
@export var jump_velocity : float = -150.0
@export var charairstate : State
@export var jump_animation : String = "jump"
@export var raycast_2d: RayCast2D
func state_process(_delta):
if raycast_2d.get_collider()==null:
playback.travel(jump_animation)
next_state = charairstate
#this is how you write when programming a state
func state_input(event : InputEvent):
if(event.is_action_pressed("ui_accept")):
jump()
func jump():
character.velocity.y = jump_velocity
next_state = charairstate
playback.travel("jump")
extends Node
# Called when the node enters the scene tree for the first time.
class_name charstatemachine
@export var current_state : State
@export var character : CharacterBody2D
@export var animation_tree : AnimationTree
var states : Array[State]
func _ready():
for child in get_children():
if(child is State):
states.append(child)
#get states that are need to function
child.character = character
child.playback = animation_tree["parameters/playback"]
else:
push_warning("Child" + child.name + "is not a state for charstatemachine")
func _physics_process(_delta):
if(current_state.next_state != null):
switch_states(current_state.next_state)
current_state.state_process(_delta)
func check_if_can_move():
return current_state.can_move
func switch_states(new_state : State):
if (current_state != null):
current_state.on_exit()
current_state.next_state = null
current_state = new_state
current_state.on_enter()
func _input(event: InputEvent):
current_state.state_input(event)
heres my code
Your state machine is null, you didn’t set it in the inspector. Please show your inspector with that node selected.
Impossible to tell from this screenshot. You’d have to paste your code and those four errors in the debugger. Maybe you should take a break from using a state machine, they can make player controllers more complicated than needed.
Your animation_tree is null, you probably need to set it like the other @export variables
null instance
func _ready() -> void:
animation_tree.active = true
Every reply to this thread has been the same, different variables but all the same issue, you must assign values to the @export variables you create or they will give you null errors.