add player stats and camera shaking on damage

scripts/main_camera.gd

@@ -1,6 +1,7 @@
 class_name MainCamera
 extends Camera3D
 
+@export_group("Positioning")
 @export var _height_offset: float = 0.5
 @export var _distance: float = 50
 @export var _angle_degrees: Vector3 = Vector3(-35, -45, 0)
@@ -8,7 +9,14 @@ extends Camera3D
 @export var _aim_offset_factor_controller: float = 0.5
 @export var _aim_damping: float = 1
 
+@export_group("Damage shake")
+@export var _damage_shake_duration: float = 0.5
+@export_exp_easing var _damage_shake_ease: float = 2
+@export var _damage_shake_amplitude: float = 0.02
+@export var _damage_shake_frequency: float = 50
+
 var _player_offsets: Dictionary[int, PlayerOffset]
+var _damage_shake_time: float = 0
 
 @onready var _listener := $AudioListener3D as AudioListener3D
 
@@ -16,6 +24,13 @@ var _player_offsets: Dictionary[int, PlayerOffset]
 func _ready() -> void:
 	Referencer.main_camera = self
 	_listener.make_current()
+	for player in Referencer.players:
+		_connect_player_signals(player)
+
+
+func _process(delta: float) -> void:
+	global_rotation_degrees = _angle_degrees
+	_damage_shake(delta)
 
 
 func _physics_process(delta: float) -> void:
@@ -25,11 +40,14 @@ func _physics_process(delta: float) -> void:
 	follow_position /= Referencer.players_count
 	follow_position += Vector3.UP * _height_offset
 
-	global_rotation_degrees = _angle_degrees
 	global_position = follow_position + transform.basis.z * _distance
 	_listener.global_position = follow_position
 
 
+func _connect_player_signals(player: Player) -> void:
+	player.stats.damaged.connect(_on_player_stats_damaged)
+
+
 func _follow(player: Player, delta: float) -> Vector3:
 	var id := player.get_instance_id()
 	if not _player_offsets.has(id):
@@ -73,6 +91,24 @@ func _follow(player: Player, delta: float) -> Vector3:
 	return follow_position
 
 
+func _damage_shake(delta: float) -> void:
+	if _damage_shake_time <= 0:
+		return
+
+	_damage_shake_time -= delta
+	var shake_value := (
+		sin(_damage_shake_frequency * _damage_shake_time) * _damage_shake_amplitude
+	)
+	global_rotation.z += (
+		shake_value
+		* ease(_damage_shake_time / _damage_shake_duration, _damage_shake_ease)
+	)
+
+
+func _on_player_stats_damaged() -> void:
+	_damage_shake_time = _damage_shake_duration
+
+
 class PlayerOffset:
 	var floor_height: float = 0
 	var aim_offset: Vector3 = Vector3.ZERO

scripts/player/player.gd

@@ -7,6 +7,7 @@ extends CharacterBody3D
 @export var _respawn_height: float = -5
 @export var _collision_debug_material: Material
 
+var stats: PlayerStats = PlayerStats.new()
 var movement: PlayerMovement = PlayerMovement.new()
 var aiming: PlayerAiming = PlayerAiming.new()
 

scripts/player/player_stats.gd

@@ -0,0 +1,10 @@
+class_name PlayerStats
+
+signal damaged
+
+var health: int = 6
+
+
+func damage() -> void:
+	health -= 1
+	damaged.emit()

scripts/player/player_stats.gd.uid

@@ -0,0 +1 @@
+uid://clks186ll0joi

scripts/projectiles/projectile.gd

@@ -43,9 +43,7 @@ func _physics_process(delta: float) -> void:
 	var speed_squash := clampf(
 		_velocity.length() / _speed_stretch_factor, 0, MAX_STRETCH
 	)
-	_model_base.scale = Vector3(
-		1 - speed_squash, 1 - speed_squash, 1 + speed_squash
-	)
+	_model_base.scale = Vector3(1 - speed_squash, 1 - speed_squash, 1 + speed_squash)
 
 
 func init(velocity: Vector3, start_position: Vector3, lifetime: float = 10) -> void:
@@ -62,6 +60,8 @@ func set_velocity(velocity: Vector3) -> void:
 func _on_body_entered(node: Node3D) -> void:
 	if node is Player:
 		queue_free()
+		var player := node as Player
+		player.stats.damage()
 		return
 
 	if node is CollisionObject3D: