Grunkbeast state machine

levels/pathing_test/pathing_test.tscn

@@ -550,5 +550,11 @@ source_gunk_material = ExtResource("14_olej6")
 [node name="CollisionShape3D" type="CollisionShape3D" parent="NavigationRegion3D/Corridor1/Hallway4/MessHallSign/GunkBody"]
 shape = SubResource("ConcavePolygonShape3D_spe8j")
 
+[node name="LurkPoint" type="Marker3D" parent="NavigationRegion3D/Corridor1" groups=["LurkPoint"]]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1.5, 4.5)
+
+[node name="LurkPoint2" type="Marker3D" parent="NavigationRegion3D/Corridor1" groups=["LurkPoint"]]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -27, 1.5, -19.5)
+
 [connection signal="activated" from="NavigationRegion3D/Corridor1/Hallway1/SwitchA2" to="NavigationRegion3D/Corridor1/Hallway1/SwitchA2" method="disable"]
 [connection signal="activated" from="NavigationRegion3D/Corridor1/Hallway4/SwitchB1" to="NavigationRegion3D/Corridor1/Hallway4/SwitchB1" method="disable"]

project.godot

@@ -81,6 +81,7 @@ config/input/hold_to_sneak=true
 MetalMaterial="This surface is made of metal."
 PlasticMaterial="This surface is made of plastic."
 MeetSpookSource="meet-spook event sources"
+LurkPoint="Point which a lurking beast may wander to."
 
 [importer_defaults]
 

src/world/grunk_beast/grunk_beast.gd

@@ -1,30 +1,179 @@
 class_name GrunkBeast extends CharacterBody3D
 ## Grunk beast controller
 
-@export var base_speed := 1.0
+#region Constants
+signal state_changed(new_state: State)
 
+enum State {
+	UNKNOWN,
+	LURKING,
+	STALKING,
+	PURSUIT,
+}
+
+const LURK_POINT_GROUP := "LurkPoint"
+const STALKING_SOUND_LIMIT := 14.0
+const IDLE_EPSILON := 0.001
+#endregion
+
+#region Exported Properties
+@export var lurk_spontaneity := 0.02
+@export var base_speed := 60.0
+@export var pursuit_speed := 180.0
+@export var initial_state := State.LURKING
+#endregion
+
+#region Member Variables
 var gravity: Vector3 = (
 	ProjectSettings.get_setting("physics/3d/default_gravity")
 	* ProjectSettings.get_setting("physics/3d/default_gravity_vector")
 )
 
+var state: State:
+	set(value):
+		if state != value:
+			_on_state_change(value)
+		state = value
+
+var pathfinding := true
+
 @onready var nav_agent: NavigationAgent3D = %NavAgent
+@onready var stalking_timeout: Timer = %StalkingTimeout
+@onready var idle_timer: Timer = %IdleTimer
+#endregion
+
+#region Character Controller
+
+
+func get_speed() -> float:
+	match state:
+		State.PURSUIT:
+			return pursuit_speed
+	return base_speed
 
 
 func _physics_process(delta: float) -> void:
-	var path_pos := nav_agent.get_next_path_position()
+	var motion := Vector3.ZERO
 
+	if pathfinding:
+		var path_pos := nav_agent.get_next_path_position()
 		var relative_pos := path_pos - global_position
-	var motion := relative_pos.normalized() * base_speed * delta
+		motion = relative_pos.normalized() * get_speed() * delta
+
 	velocity.x = motion.x
 	velocity.z = motion.z
 
 	if not is_on_floor():
 		velocity += gravity * delta
 
+	if velocity.length_squared() > IDLE_EPSILON:
+		idle_timer.start()
+
 	move_and_slide()
 
 
-func track_player() -> void:
+#endregion
+
+#region State Machine
+
+
+func _ready() -> void:
+	state = initial_state
+
+
+func _current_path_shorter_than(limit: float) -> bool:
+	var limit_sq := limit * limit
+	var length_sq := 0.0
+	var last_pos := global_position
+
+	for waypoint: Vector3 in nav_agent.get_current_navigation_path().slice(
+		nav_agent.get_current_navigation_path_index()
+	):
+		# Using distance squared to save a sqrt instruction
+		length_sq += last_pos.distance_squared_to(waypoint)
+		if length_sq > limit_sq:
+			return false
+		last_pos = waypoint
+
+	return true
+
+
+func _set_new_lurk_point() -> void:
+	@warning_ignore("unsafe_cast")
+	var next_lurk_point := get_tree().get_nodes_in_group(LURK_POINT_GROUP).pick_random() as Node3D
+	if next_lurk_point:
+		nav_agent.target_position = next_lurk_point.global_position
+	else:
+		push_warning(self, " tried to lurk, but couldn't find a lurk point!")
+
+
+## Lurking routine
+func lurk() -> void:
+	if nav_agent.is_target_reached() or randf() < lurk_spontaneity:
+		_set_new_lurk_point()
+
+
+## Stalking routine
+func stalk() -> void:
+	pass
+
+
+## Pursuit routine
+func pursue() -> void:
 	if Player.instance:
 		nav_agent.target_position = Player.instance.global_position
+
+
+func _on_state_change(new_state: State) -> void:
+	match new_state:
+		State.LURKING:
+			_set_new_lurk_point()
+		State.STALKING:
+			stalking_timeout.start()
+
+	state_changed.emit(new_state)
+
+
+func update_behavior() -> void:
+	match state:
+		State.UNKNOWN:
+			state = State.LURKING
+			update_behavior()
+		State.LURKING:
+			lurk()
+		State.STALKING:
+			stalk()
+		State.PURSUIT:
+			pursue()
+
+
+func on_sound_detected(source: Vector3) -> void:
+	var prev_target := nav_agent.target_position
+	nav_agent.target_position = source
+	# Check that the source isn't too far away, e.g. a sound from another room
+	if _current_path_shorter_than(STALKING_SOUND_LIMIT):
+		# First detection switches to stalking, second switches to pursuit
+		if state == State.STALKING:
+			state = State.PURSUIT
+		else:
+			state = State.STALKING
+	else:
+		nav_agent.target_position = prev_target
+
+
+func on_player_entered_grabbing_range(_body: Node3D) -> void:
+	print_debug("GET GRABBED, IDIOT!")
+
+
+func on_player_left_pursuit_range(_body: Node3D) -> void:
+	state = State.STALKING
+
+
+func on_stalking_timeout_timeout() -> void:
+	state = State.LURKING
+
+
+func on_stalking_idle_timer_timeout() -> void:
+	pass  # Replace with function body.
+
+#endregion

src/world/grunk_beast/grunk_beast.tscn

@@ -1,7 +1,8 @@
-[gd_scene load_steps=12 format=3 uid="uid://ehf5sg3ahvbf"]
+[gd_scene load_steps=16 format=3 uid="uid://ehf5sg3ahvbf"]
 
 [ext_resource type="Script" uid="uid://gwwmqwixqqr5" path="res://src/world/grunk_beast/grunk_beast.gd" id="2_qqnhb"]
 [ext_resource type="Shader" uid="uid://ckxc0ngd37rtk" path="res://src/shaders/gunk.gdshader" id="4_0gxpq"]
+[ext_resource type="Script" uid="uid://cfsiyhhrcua6o" path="res://src/world/game_sound/game_sound_listener.gd" id="5_3gbao"]
 [ext_resource type="Texture2D" uid="uid://cm1jrvx7ftx4c" path="res://assets/black.png" id="5_xuag8"]
 [ext_resource type="FastNoiseLite" uid="uid://cnlvdtx68giv6" path="res://assets/materials/gunk_noise.tres" id="6_mbqcc"]
 
@@ -63,9 +64,17 @@ rings = 1
 [sub_resource type="CapsuleShape3D" id="CapsuleShape3D_faau1"]
 radius = 0.45
 
+[sub_resource type="SphereShape3D" id="SphereShape3D_wffas"]
+radius = 7.0
+
+[sub_resource type="SphereShape3D" id="SphereShape3D_3gbao"]
+radius = 1.4
+
+[sub_resource type="SphereShape3D" id="SphereShape3D_d4ex2"]
+radius = 20.0
+
 [node name="GrunkBeast" type="CharacterBody3D"]
 script = ExtResource("2_qqnhb")
-base_speed = 60.0
 
 [node name="MeshInstance3D" type="MeshInstance3D" parent="."]
 mesh = SubResource("CapsuleMesh_d4ex2")
@@ -82,7 +91,44 @@ shape = SubResource("CapsuleShape3D_faau1")
 [node name="NavAgent" type="NavigationAgent3D" parent="."]
 unique_name_in_owner = true
 
-[node name="TrackingTimer" type="Timer" parent="."]
+[node name="IdleTimer" type="Timer" parent="."]
+unique_name_in_owner = true
+wait_time = 1.2
+one_shot = true
+
+[node name="StalkingTimeout" type="Timer" parent="."]
+unique_name_in_owner = true
+wait_time = 25.0
+one_shot = true
+
+[node name="BehaviorUpdateTimer" type="Timer" parent="."]
 autostart = true
 
-[connection signal="timeout" from="TrackingTimer" to="." method="track_player"]
+[node name="GameSoundListener" type="StaticBody3D" parent="."]
+collision_layer = 16
+collision_mask = 0
+script = ExtResource("5_3gbao")
+metadata/_custom_type_script = "uid://cfsiyhhrcua6o"
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="GameSoundListener"]
+shape = SubResource("SphereShape3D_wffas")
+
+[node name="GrabbingRange" type="Area3D" parent="."]
+collision_layer = 0
+collision_mask = 8
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="GrabbingRange"]
+shape = SubResource("SphereShape3D_3gbao")
+
+[node name="PursuitLimit" type="Area3D" parent="."]
+collision_layer = 0
+collision_mask = 8
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="PursuitLimit"]
+shape = SubResource("SphereShape3D_d4ex2")
+
+[connection signal="timeout" from="StalkingTimeout" to="." method="on_stalking_timeout_timeout"]
+[connection signal="timeout" from="BehaviorUpdateTimer" to="." method="update_behavior"]
+[connection signal="sound_detected" from="GameSoundListener" to="." method="on_sound_detected"]
+[connection signal="body_entered" from="GrabbingRange" to="." method="on_player_entered_grabbing_range"]
+[connection signal="body_exited" from="PursuitLimit" to="." method="on_player_left_pursuit_range"]

src/world/procedural_grunk_beast/ik_target.gd

@@ -10,7 +10,7 @@ const CRITICAL_ANGLE := 0.1
 var stepping := false
 var _resting := false
 
-@onready var parent := owner as GrunkBeast
+@onready var parent := owner as ProceduralGrunkBeast
 
 
 func step() -> void:

src/world/procedural_grunk_beast/target_container.gd

@@ -1,6 +1,6 @@
 extends Node3D
 
-@onready var parent := owner as GrunkBeast
+@onready var parent := owner as ProceduralGrunkBeast
 @onready var prev_position := parent.global_position