Implemented physics interpolation

client/Global.gd

@@ -11,6 +11,6 @@ var terrain: Terrain3D
 var instance_id: int
 
 func _enter_tree():
-	instance_id = 0
+	instance_id = OS.get_process_id() % 2
 	account = Account.new()
 	account.name = "user%d" % instance_id

client/Main.tscn

@@ -28,6 +28,7 @@ process_thread_group = 2
 process_thread_group_order = 0
 process_thread_messages = 0
 script = ExtResource("2_8hxcx")
+host = "akyoto.dev"
 
 [node name="Ping" type="Node" parent="Client"]
 unique_name_in_owner = true
@@ -84,8 +85,6 @@ process_thread_group_order = 0
 process_thread_messages = 0
 autostart = true
 
-[node name="Camera" parent="." instance=ExtResource("12_aljdh")]
-
 [node name="World" parent="." instance=ExtResource("13_sqmhj")]
 process_thread_group = 2
 process_thread_group_order = 0
@@ -95,8 +94,20 @@ process_thread_messages = 0
 unique_name_in_owner = true
 script = ExtResource("16_dp6bj")
 
+[node name="UpdatePlayers" type="Timer" parent="Players"]
+unique_name_in_owner = true
+process_priority = 1
+wait_time = 0.25
+autostart = true
+
+[node name="Camera" parent="." instance=ExtResource("12_aljdh")]
+process_priority = 100
+process_physics_priority = 100
+
 [node name="UI" parent="." instance=ExtResource("17_43qhq")]
 process_mode = 3
+process_priority = 100
+process_physics_priority = 100
 
 [connection signal="timeout" from="Client/Ping/Timer" to="Client/Ping" method="send_ping"]
 [connection signal="timeout" from="Client/Login/Timer" to="Client/Login" method="send_login"]

client/enemy/death/DeathComponent.gd

@@ -1,5 +1,5 @@
 class_name DeathComponent
-extends Node
+extends CharacterComponent
 
 @export var health: HealthComponent
 @export var hud: HUDComponent
@@ -10,7 +10,7 @@ extends Node
 var respawn_position: Vector3
 
 func _ready():
-	respawn_position = owner.global_position
+	respawn_position = character.global_position
 	health.death.connect(on_death)
 
 func on_death():
@@ -21,20 +21,20 @@ func on_death():
 
 func drop_loot():
 	var loot := drop.instantiate() as Node3D
-	owner.get_parent().add_child(loot)
-	loot.global_position = owner.global_position + loot.position
+	character.get_parent().add_child(loot)
+	loot.global_position = character.global_position + loot.position
 
 func die():
-	DeathComponent.set_physics(owner, false)
+	DeathComponent.set_physics(character, false)
 	hud.visible = false
 	animation.play("slime_death")
 
 func revive():
 	health.restore()
-	DeathComponent.set_physics(owner, true)
+	DeathComponent.set_physics(character, true)
 	hud.visible = true
-	(owner as Node3D).transform = Transform3D.IDENTITY
-	owner.global_position = respawn_position
+	character.transform = Transform3D.IDENTITY
+	character.global_position = respawn_position
 	animation.play("slime_idle")
 
 static func set_physics(obj: Node3D, alive: bool):

client/item/soul/Soul.gd

@@ -24,7 +24,7 @@ func _process(delta):
 	if !collected_by:
 		return
 	
-	global_position = Math.damp(global_position, Global.player.global_position + Vector3.UP, 0.75 * delta)
+	global_position = Math.damp_vector(global_position, Global.player.global_position + Vector3.UP, 0.75 * delta)
 
 func on_body_entered(body: Node3D):
 	if not body is Player:

client/math/Math.gd

@@ -1,17 +1,20 @@
 class_name Math
 
-static func damp(from: Variant, to: Variant, weight: float):
+static func damp(from: Variant, to: Variant, weight: float) -> Variant:
 	return lerp(from, to, 1 - exp(-weight))
 
-static func dampf(from: float, to: float, weight: float):
+static func dampf(from: float, to: float, weight: float) -> float:
 	return lerpf(from, to, 1 - exp(-weight))
 
-static func damp_angle(from: float, to: float, weight: float):
+static func damp_angle(from: float, to: float, weight: float) -> float:
 	return lerp_angle(from, to, 1 - exp(-weight))
 
-static func damp_spherical(from: Vector3, to: Vector3, weight: float):
+static func damp_spherical(from: Vector3, to: Vector3, weight: float) -> Vector3:
 	return from.slerp(to, 1 - exp(-weight))
 
+static func damp_vector(from: Vector3, to: Vector3, weight: float) -> Vector3:
+	return from.lerp(to, 1 - exp(-weight))
+
 static func from_to_rotation(from: Vector3, to: Vector3) -> Quaternion:
 	var axis := from.cross(to).normalized()
 	var angle := from.angle_to(to)

client/player/Character.gd

@@ -1,5 +1,5 @@
 class_name Character
-extends CharacterBody3D
+extends Node3D
 
 signal controlled(Controller)
 

client/player/CharacterComponent.gd

@@ -0,0 +1,9 @@
+class_name CharacterComponent
+extends Node
+
+var character: Character
+
+func _enter_tree():
+	assert(owner, "owner not set")
+	assert(owner is Character, "owner must be a character")
+	character = owner

client/player/Player.gd

@@ -7,10 +7,16 @@ var id: String
 ## Components
 var movement: MovementComponent
 var state: StateComponent
+var performance: PerformanceComponent
+var animation: AnimationComponent
+var physics: CharacterBody3D
 
 func _enter_tree():
 	movement = $Movement
 	state = $State
+	performance = $Performance
+	animation = $Animation
+	physics = $Physics
 
 ## Name
 signal name_changed(new_name: String)

client/player/Player.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=31 format=3 uid="uid://2lcnu3dy54lx"]
+[gd_scene load_steps=32 format=3 uid="uid://2lcnu3dy54lx"]
 
 [ext_resource type="Script" path="res://player/Player.gd" id="1_8gebs"]
 [ext_resource type="PackedScene" uid="uid://c8j7t4yg7anb0" path="res://assets/female/Female.blend" id="2_8nah6"]
@@ -26,6 +26,7 @@
 [ext_resource type="AudioStream" uid="uid://cdywep3dxm0y3" path="res://assets/audio/footsteps/Footsteps-Human-Dirt-07.wav" id="19_vvmo0"]
 [ext_resource type="AudioStream" uid="uid://bp8pka7qhcetq" path="res://assets/audio/footsteps/Footsteps-Human-Dirt-08.wav" id="20_srjtb"]
 [ext_resource type="AudioStream" uid="uid://bgdodasvt7ier" path="res://assets/audio/footsteps/Footsteps-Human-Dirt-01.wav" id="21_a8ikg"]
+[ext_resource type="PackedScene" uid="uid://b5yfm1sektkv" path="res://player/performance/PerformanceComponent.tscn" id="22_iqcgj"]
 [ext_resource type="PackedScene" uid="uid://sx4ein0bju6m" path="res://player/state/StateComponent.tscn" id="28_0i0of"]
 [ext_resource type="PackedScene" uid="uid://csidusk3jpq0m" path="res://player/voice/VoiceComponent.tscn" id="28_iolce"]
 
@@ -58,10 +59,16 @@ stream_8/weight = 1.0
 stream_9/stream = ExtResource("21_a8ikg")
 stream_9/weight = 1.0
 
-[node name="Player" type="CharacterBody3D" groups=["player"]]
+[node name="Player" type="Node3D"]
+script = ExtResource("1_8gebs")
+
+[node name="Physics" type="CharacterBody3D" parent="."]
 collision_layer = 512
 collision_mask = 769
-script = ExtResource("1_8gebs")
+
+[node name="Collision" type="CollisionShape3D" parent="Physics"]
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.8, 0)
+shape = SubResource("CapsuleShape3D_2f50n")
 
 [node name="Model" type="Node3D" parent="."]
 
@@ -97,10 +104,6 @@ bone_idx = 44
 [node name="Heirloom" parent="Model/Female/Armature/GeneralSkeleton/Weapon" instance=ExtResource("7_u8433")]
 transform = Transform3D(-4.37114e-08, 1, 0, -1, -4.37114e-08, 0, 0, 0, 1, 0.197644, 0, 0)
 
-[node name="Collision" type="CollisionShape3D" parent="."]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.8, 0)
-shape = SubResource("CapsuleShape3D_2f50n")
-
 [node name="HUD" parent="." node_paths=PackedStringArray("health") instance=ExtResource("7_fwgtd")]
 layers = 512
 visibility_range_end = 50.0
@@ -129,10 +132,14 @@ footsteps = SubResource("AudioStreamRandomizer_4yj1k")
 [node name="Health" parent="." instance=ExtResource("2_np5ag")]
 max_value = 100.0
 
-[node name="Movement" parent="." instance=ExtResource("8_25qd0")]
+[node name="Movement" parent="." node_paths=PackedStringArray("body") instance=ExtResource("8_25qd0")]
+body = NodePath("../Physics")
+
+[node name="Performance" parent="." node_paths=PackedStringArray("animation") instance=ExtResource("22_iqcgj")]
+animation = NodePath("../Animation")
 
 [node name="Rotation" parent="." node_paths=PackedStringArray("root") instance=ExtResource("9_agxqu")]
-root = NodePath("..")
+root = NodePath("../Model")
 
 [node name="Skills" parent="." instance=ExtResource("14_6idcf")]
 skills = Array[Resource("res://skill/Skill.gd")]([ExtResource("2_x58e1"), ExtResource("3_l76ly"), null, ExtResource("5_pnues")])

client/player/animation/AnimationComponent.gd

@@ -1,16 +1,27 @@
 class_name AnimationComponent
-extends Node
+extends CharacterComponent
+
+@export var skip_frames: int = 0
 
 var animations: AnimationPlayer
 var state: StateComponent
+var accumulated_delta: float
+var skipped_frames: int
 
 func _ready():
-	state = owner.get_node("State")
+	state = character.get_node("State")
 	state.transitioned.connect(on_transition)
 	animations = %AnimationPlayer
 
 func _process(delta):
-	animations.advance(delta)
+	accumulated_delta += delta
+
+	if skipped_frames >= skip_frames:
+		animations.advance(accumulated_delta)
+		accumulated_delta = 0
+		skipped_frames = 0
+	else:
+		skipped_frames += 1
 
 func on_transition(_from: StateComponent.State, to: StateComponent.State):
 	match to:

client/player/controller/ProxyController.gd

@@ -1,22 +1,25 @@
 class_name ProxyController
 extends Controller
 
-@export var interpolation_speed := 5.0
+@export var interpolation_speed := 20.0
 
 var player: Player
+var movement: MovementComponent
 var server_position: Vector3
 
 func _init(new_player: Player):
 	player = new_player
+	movement = player.movement
 	name = "Controller"
+	process_physics_priority = 1
 
 func _ready():
 	server_position = player.position
 
 func _physics_process(delta: float):
-	if absf(server_position.x - player.position.x) < 0.001 && absf(server_position.z - player.position.z) < 0.001:
+	if absf(server_position.x - movement.physics_position.x) < 0.001 && absf(server_position.z - movement.physics_position.z) < 0.001:
 		return
 	
 	var time := interpolation_speed * delta
-	player.position.x = Math.dampf(player.position.x, server_position.x, time)
-	player.position.z = Math.dampf(player.position.z, server_position.z, time)
+	movement.physics_position.x = Math.dampf(movement.physics_position.x, server_position.x, time)
+	movement.physics_position.z = Math.dampf(movement.physics_position.z, server_position.z, time)

client/player/movement/MovementComponent.gd

@@ -1,24 +1,30 @@
 class_name MovementComponent
-extends Node
+extends CharacterComponent
 
+static var ticks_per_second := ProjectSettings.get_setting("physics/common/physics_ticks_per_second") as float
+static var gravity := ProjectSettings.get_setting("physics/3d/default_gravity") as float
+
+@export var body: CharacterBody3D
 @export var move_speed := 4.5
 @export var jump_velocity := 4.5
 @export var deceleration_speed := 20
 
-var body: Character
 var direction: Vector3
-var gravity: float
+var physics_position: Vector3
 
 func _ready():
-	gravity = ProjectSettings.get_setting("physics/3d/default_gravity")
-	body = owner as Character
-	body.controlled.connect(on_controlled)
+	physics_position = character.position
+	character.controlled.connect(on_controlled)
 
-func on_controlled(controller: Controller):
-	controller.direction_changed.connect(on_direction_changed)
-	controller.jumped.connect(jump)
+func _process(delta: float):
+	character.position = Math.damp_vector(character.position, physics_position, ticks_per_second * delta)
 
-func _physics_process(delta):
+func _physics_process(delta: float):
+	begin_physics()
+	move(delta)
+	end_physics()
+
+func move(delta: float):
 	if direction:
 		body.velocity.x = direction.x * move_speed
 		body.velocity.z = direction.z * move_speed
@@ -34,11 +40,22 @@ func _physics_process(delta):
 	
 	body.move_and_slide()
 
-func on_direction_changed(new_direction: Vector3):
-	direction = new_direction
+func begin_physics():
+	body.global_position = physics_position
+
+func end_physics():
+	physics_position = body.global_position
+	body.position = Vector3.ZERO
 
 func can_jump() -> bool:
 	return body.is_on_floor()
 
 func jump():
 	body.velocity.y = jump_velocity
+
+func on_controlled(controller: Controller):
+	controller.direction_changed.connect(on_direction_changed)
+	controller.jumped.connect(jump)
+
+func on_direction_changed(new_direction: Vector3):
+	direction = new_direction

client/player/performance/PerformanceComponent.gd

@@ -0,0 +1,72 @@
+class_name PerformanceComponent
+extends VisibleOnScreenNotifier3D
+
+const SKIP_FRAMES_INVISIBLE := 16
+const SKIP_FRAMES_VISIBLE := 8
+
+static var quality_budget: Array[int] = [
+	10, # 0 skipped frames
+	10, # 1 skipped frame
+	10, # 2 skipped frames
+	10, # 3 skipped frames
+	10, # 4 skipped frames
+	10, # 5 skipped frames
+	10, # 6 skipped frames
+	10, # 7 skipped frames
+]
+
+@export var animation: AnimationComponent
+
+var camera_distance_squared: float
+var on_screen: bool
+var skip_frames_visible: int
+
+func _ready():
+	assert(animation)
+	screen_entered.connect(on_screen_entered)
+	screen_exited.connect(on_screen_exited)
+
+func on_screen_entered():
+	on_screen = true
+	animation.skip_frames = skip_frames_visible
+
+func on_screen_exited():
+	on_screen = false
+	animation.skip_frames = SKIP_FRAMES_INVISIBLE
+
+static func update_all_animations():
+	var visible_players: Array[Player] = []
+
+	for player in Global.players.id_to_player.values():
+		player.performance.camera_distance_squared = player.global_position.distance_squared_to(Global.camera.global_position)
+
+		if player.performance.on_screen:
+			visible_players.append(player)
+		else:
+			player.performance.animation.skip_frames = SKIP_FRAMES_INVISIBLE
+	
+	if Global.player:
+		Global.player.performance.camera_distance_squared = 0
+
+	visible_players.sort_custom(PerformanceComponent.distance_sort)
+	
+	var skip_frames := 0
+	var count := 0
+
+	for player in visible_players:
+		if skip_frames >= quality_budget.size():
+			player.performance.skip_frames_visible = SKIP_FRAMES_VISIBLE
+			player.animation.skip_frames = SKIP_FRAMES_VISIBLE
+			continue
+
+		player.performance.skip_frames_visible = skip_frames
+		player.animation.skip_frames = skip_frames
+		count += 1
+
+		if count >= quality_budget[skip_frames]:
+			skip_frames += 1
+			count = 0
+
+static func distance_sort(a: Player, b: Player) -> bool:
+	return a.performance.camera_distance_squared < b.performance.camera_distance_squared
+	

client/player/performance/PerformanceComponent.tscn

@@ -0,0 +1,7 @@
+[gd_scene load_steps=2 format=3 uid="uid://b5yfm1sektkv"]
+
+[ext_resource type="Script" path="res://player/performance/PerformanceComponent.gd" id="1_vp0dv"]
+
+[node name="Performance" type="VisibleOnScreenNotifier3D"]
+aabb = AABB(-1, 0, -1, 2, 2, 2)
+script = ExtResource("1_vp0dv")

client/player/rotation/RotationComponent.gd

@@ -1,5 +1,5 @@
 class_name RotationComponent
-extends Node
+extends CharacterComponent
 
 @export var root: Node3D
 @export var rotation_speed: float = 15.0
@@ -8,8 +8,9 @@ var direction: Vector3
 var angle: float
 
 func _ready():
-	assert(root, "Rotation root needs to be set")
-	(owner as Character).controlled.connect(on_controlled)
+	assert(root, "rotation root needs to be set")
+	assert(rotation_speed > 0, "rotation speed must be greater than zero")
+	character.controlled.connect(on_controlled)
 
 func _process(delta):
 	if absf(angle_difference(root.rotation.y, angle)) < 0.001:

client/player/skills/SkillsComponent.gd

@@ -1,12 +1,9 @@
 class_name SkillsComponent
-extends Node
+extends CharacterComponent
 
 @export var skills: Array[Skill]
 
-var character: Character
-
 func _ready():
-	character = owner
 	character.controlled.connect(on_controlled)
 
 func on_controlled(controller: Controller):
@@ -25,4 +22,4 @@ func use_skill(slot: int):
 		return
 	
 	var scene := skill.scene.instantiate()
-	owner.add_child(scene)
+	character.add_child(scene)

client/player/state/StateComponent.gd

@@ -1,5 +1,5 @@
 class_name StateComponent
-extends Node
+extends CharacterComponent
 
 enum State {
 	None,
@@ -17,7 +17,7 @@ var _current: State
 
 func _ready():
 	current = State.Idle
-	movement = owner.get_node("Movement")
+	movement = character.get_node("Movement")
 
 func _process(_delta):
 	if current == State.Skill:

client/ui/chat/ChatInput.gd

@@ -25,4 +25,6 @@ func on_focus_exited():
 func on_text_submitted(message: String):
 	text = ""
 	release_focus()
-	(owner as Chat).message_submitted.emit(message)
+	
+	var chat := owner as Chat
+	chat.message_submitted.emit(message)

client/ui/debug/DebugLabelText.gd

@@ -4,6 +4,6 @@ extends Label
 func _ready():
 	text = get_parent().name + ":"
 
-func _get_configuration_warnings():
+func _get_configuration_warnings() -> PackedStringArray:
 	text = get_parent().name + ":"
 	return []

client/ui/debug/VelocityLabel.gd

@@ -4,4 +4,4 @@ func _process(_delta):
 	if Global.player == null:
 		return
 
-	text = str(Global.player.velocity)
+	text = str(Global.player.physics.velocity)

client/world/PlayerManager.gd

@@ -1,27 +1,33 @@
 class_name PlayerManager
 extends Node3D
 
-var players = {}
+var id_to_player = {}
 
 func _ready():
 	Global.players = self
 
+	var timer := %UpdatePlayers as Timer
+	timer.timeout.connect(tick)
+
+func tick():
+	PerformanceComponent.update_all_animations()
+
 func add(player: Player):
 	if has(player.id):
 		return
 	
 	add_child(player)
-	players[player.id] = player
+	id_to_player[player.id] = player
 
 func get_player(id: String) -> Player:
-	return players[id] as Player
+	return id_to_player[id] as Player
 
 func has(id: String) -> bool:
-	return players.has(id)
+	return id_to_player.has(id)
 
 func remove(id: String):
-	if !players.has(id):
+	if !id_to_player.has(id):
 		return
 	
-	players[id].queue_free()
-	players.erase(id)
+	id_to_player[id].queue_free()
+	id_to_player.erase(id)

stresstest/main.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
+	"math/rand"
 	"net"
 	"sync"
 	"time"
@@ -49,7 +50,8 @@ func udpClient(wg *sync.WaitGroup, id int) {
 
 	defer conn.Close()
 
-	loginRequest := [2]string{fmt.Sprintf("user%d", id+1), sha256Text("password")}
+	username := fmt.Sprintf("user%d", id+1)
+	loginRequest := [2]string{username, sha256Text("password")}
 	data, err := json.Marshal(loginRequest)
 
 	if err != nil {
@@ -69,6 +71,10 @@ func udpClient(wg *sync.WaitGroup, id int) {
 			return
 		}
 
+		if rand.Float32() > 0.5 {
+			conn.Write([]byte{13})
+		}
+
 		time.Sleep(*sleepTime)
 	}
 }