partial tagging system

level/StaticBody3D.gd

@@ -0,0 +1,4 @@
+extends StaticBody3D
+
+func grounded(src: Player):
+	src._is_grounded = true

level/level.gd

@@ -1,4 +1,65 @@
 extends Node3D
+class_name Level
+
+enum GameState {
+	WAITING, # Stop state to be used by default, nothing should react to this
+	TAGGER_GROUNDED, # Tagger is on the ground
+	TAGGER_UNGROUNDED, # Tagger is off the ground
+	TAGGER_CHANGE, # Tagger has caught someone, and new person must go to ground
+}
+
+var game_state: GameState = GameState.WAITING
+var game_tagger: Player
+
+signal state_change(old: GameState, new: GameState)
+signal state_enter_tagger_grounded
+signal state_leave_tagger_grounded
+signal state_enter_tagger_ungrounded
+signal state_leave_tagger_ungrounded
+signal state_enter_tagger_change(new_tagger: Player)
+signal state_leave_tagger_change
+
+func set_tagger_grounded(v: bool):
+	if v and game_state == GameState.TAGGER_CHANGE:
+		_change_state(GameState.TAGGER_GROUNDED)
+		return
+	if not (game_state == GameState.TAGGER_GROUNDED or game_state == GameState.TAGGER_UNGROUNDED):
+		return
+	if (not v) and game_state == GameState.TAGGER_GROUNDED:
+		_change_state(GameState.TAGGER_UNGROUNDED)
+	if v and game_state == GameState.TAGGER_UNGROUNDED:
+		_change_state(GameState.TAGGER_GROUNDED)
+
+func set_tagger(who: Player):
+	if game_state == GameState.WAITING:
+		return
+	game_tagger = who
+	_change_state(GameState.TAGGER_CHANGE)
+
+func _change_state(new_state: GameState):
+	if game_state == new_state:
+		return
+	if new_state == GameState.WAITING:
+		game_tagger = null
+	state_change.emit(game_state, new_state)
+	if new_state == GameState.TAGGER_GROUNDED:
+		state_enter_tagger_grounded.emit()
+	if new_state == GameState.TAGGER_UNGROUNDED:
+		state_enter_tagger_ungrounded.emit()
+	if new_state == GameState.TAGGER_CHANGE:
+		state_enter_tagger_change.emit(game_tagger)
+		
+	var old_state = game_state
+	game_state = new_state
+	
+	if old_state == GameState.TAGGER_GROUNDED:
+		state_leave_tagger_grounded.emit()
+	if old_state == GameState.TAGGER_UNGROUNDED:
+		state_leave_tagger_ungrounded.emit()
+	if old_state == GameState.TAGGER_CHANGE:
+		state_leave_tagger_change.emit()
+	
+
 
 func _ready():
 	# Hacky way to start level without going though multiplayer screens
@@ -8,3 +69,9 @@ func _ready():
 # Called from the server
 func server_add_player(id: int):
 	%PlayerSpawner.spawn(id)
+
+static func find_level(node: Node) -> Level:
+	var parent := node
+	while not (node is Level):
+		node = node.get_parent()
+	return node

level/level.tscn

@@ -1,8 +1,9 @@
-[gd_scene load_steps=9 format=3 uid="uid://b00brfkibo5cj"]
+[gd_scene load_steps=10 format=3 uid="uid://b00brfkibo5cj"]
 
 [ext_resource type="PackedScene" uid="uid://bq654gwim6col" path="res://level/level.glb" id="1_s37in"]
 [ext_resource type="Environment" uid="uid://covjrwmk4rplw" path="res://level/world_environment.tres" id="2_ptkl6"]
 [ext_resource type="Script" path="res://level/level.gd" id="2_s1bx6"]
+[ext_resource type="Script" path="res://level/StaticBody3D.gd" id="4_6rwm2"]
 [ext_resource type="Script" path="res://addons/smoother/smoother.gd" id="5_2tyle"]
 [ext_resource type="Script" path="res://level/PlayerSpawner.gd" id="6_7ww0m"]
 [ext_resource type="MeshLibrary" uid="uid://cgh6y5j8wgi36" path="res://level/mesh_library/level_mesh_library.glb" id="6_d34iv"]
@@ -22,7 +23,8 @@ environment = ExtResource("2_ptkl6")
 [node name="DirectionalLight3D" type="DirectionalLight3D" parent="WorldEnvironment" index="0"]
 transform = Transform3D(1, 0, 0, 0, 0.566018, 0.824393, 0, -0.824393, 0.566018, 0, 13.4573, 0)
 
-[node name="StaticBody3D" type="StaticBody3D" parent="Plane" index="0"]
+[node name="StaticBody3D" type="StaticBody3D" parent="Plane" index="0" groups=["ground"]]
+script = ExtResource("4_6rwm2")
 
 [node name="CollisionShape3D" type="CollisionShape3D" parent="Plane/StaticBody3D" index="0"]
 transform = Transform3D(0.1, 0, 0, 0, 0.1, 0, 0, 0, 0.1, 0, 0, 0)

player/player.gd

@@ -1,6 +1,7 @@
 # Automatically Generated From Builtin CharacterBody Template
 
 extends CharacterBody3D
+class_name Player
 
 @export var SPEED = 5.0
 @export var JUMP_VELOCITY = 4.5
@@ -10,6 +11,21 @@ var gravity = ProjectSettings.get_setting("physics/3d/default_gravity")
 # Set by camera child, switch to signals if becomes too spaghetti
 var movement_dir: Vector2 = Vector2.ZERO
 
+# Using signals to maintain a list of currently colliding players because it simplifies 
+# Memory management substantially since nodes are not GC'd
+# Connected nodes are the colliding nodes
+signal is_bumping(src: Player)
+var _is_grounded := false
+signal is_grounded
+
+func is_on_ground() -> bool:
+	_is_grounded = false
+	is_grounded.emit()
+	var v := _is_grounded
+	_is_grounded = false
+	return v
+	
+
 func _physics_process(delta):
 	if not is_on_floor():
 		velocity.y -= gravity * delta
@@ -25,3 +41,44 @@ func _physics_process(delta):
 		velocity.z = move_toward(velocity.z, 0, SPEED)
 
 	move_and_slide()
+
+var _first_bumper: Player = null
+	
+func _bump_check(src: Player):
+	if src._first_bumper == null:
+		src._first_bumper = self
+	
+func get_first_bumper() -> Player:
+	_first_bumper = null
+	is_bumping.emit(self)
+	var player := _first_bumper
+	_first_bumper = null
+	return player
+
+func _on_tag_detection_area_entered(area):
+	if not (area.get_parent() is Player):
+		return
+	var other_player: Player = area.get_parent()
+	if is_bumping.is_connected(_bump_check):
+		return
+	is_bumping.connect(_bump_check)
+	
+func _on_tag_detection_area_exited(area):
+	if not (area.get_parent() is Player):
+		return
+	var other_player: Player = area.get_parent()
+	if not is_bumping.is_connected(_bump_check):
+		return
+	is_bumping.disconnect(_bump_check)
+
+
+func _on_tag_detection_body_entered(body):
+	if body.is_in_group("ground"):
+		if not is_grounded.is_connected(body.grounded):
+			is_grounded.connect(body.grounded)
+
+
+func _on_tag_detection_body_exited(body):
+	if body.is_in_group("ground"):
+		if is_grounded.is_connected(body.grounded):
+			is_grounded.disconnect(body.grounded)

player/player.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=5 format=3 uid="uid://do25xvpy80iio"]
+[gd_scene load_steps=6 format=3 uid="uid://do25xvpy80iio"]
 
 [ext_resource type="PackedScene" uid="uid://bwg2jkbq7gada" path="res://player/player.glb" id="1_0u2un"]
 [ext_resource type="Script" path="res://player/player.gd" id="1_gh340"]
@@ -11,6 +11,9 @@ properties/0/replication_mode = 1
 [sub_resource type="SphereShape3D" id="SphereShape3D_t1htn"]
 radius = 0.986757
 
+[sub_resource type="SphereShape3D" id="SphereShape3D_ylark"]
+radius = 1.0605
+
 [node name="player" instance=ExtResource("1_0u2un")]
 floor_max_angle = 1.32121
 script = ExtResource("1_gh340")
@@ -21,3 +24,15 @@ replication_config = SubResource("SceneReplicationConfig_u4bmc")
 
 [node name="CollisionShape3D" type="CollisionShape3D" parent="." index="2"]
 shape = SubResource("SphereShape3D_t1htn")
+
+[node name="TagDetection" type="Area3D" parent="." index="3"]
+collision_layer = 8388608
+collision_mask = 8388608
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="TagDetection" index="0"]
+shape = SubResource("SphereShape3D_ylark")
+
+[connection signal="area_entered" from="TagDetection" to="." method="_on_tag_detection_area_entered"]
+[connection signal="area_exited" from="TagDetection" to="." method="_on_tag_detection_area_exited"]
+[connection signal="body_entered" from="TagDetection" to="." method="_on_tag_detection_body_entered"]
+[connection signal="body_exited" from="TagDetection" to="." method="_on_tag_detection_body_exited"]

project.godot

@@ -35,7 +35,6 @@ config/icon="res://icon.svg"
 
 [autoload]
 
-MultiplayerEvents="*res://server/MultiplayerEvents.gd"
 FmodManager="*res://addons/fmod/FmodManager.gd"
 
 [editor_plugins]

server/MultiplayerEvents.gd

@@ -1,2 +0,0 @@
-extends Node
-