add particle hit effect

scripts/effects/particles_3d_self_destructing.gd

@@ -0,0 +1,18 @@
+class_name Particles3DSelfDestructing extends GPUParticles3D
+
+
+func _ready() -> void:
+	emitting = true
+	for node in get_children():
+		if node is GPUParticles3D:
+			(node as GPUParticles3D).emitting = true
+	finished.connect(_on_finished)
+
+
+func init(start_position: Vector3, direction: Vector3 = Vector3.ZERO) -> void:
+	global_position = start_position
+	look_at(global_position + direction)
+
+
+func _on_finished() -> void:
+	queue_free()

scripts/effects/particles_3d_self_destructing.gd.uid

@@ -0,0 +1 @@
+uid://x3uft3uwakct

scripts/player/player_attack.gd

@@ -134,7 +134,7 @@ func _hit_projectile(projectile: Projectile) -> void:
 				projectile.global_position,
 				projectile.global_position + new_direction
 			)
-			projectile.set_velocity(new_direction * _hit_projectile_speed)
+			projectile.hit(new_direction * _hit_projectile_speed)
 			break
 
 		prev_dir_angle = dir_angle

scripts/projectiles/projectile.gd

@@ -7,6 +7,7 @@ const MAX_STRETCH: float = 0.75
 @export var _speed_stretch_factor: float = 100
 
 @export var _collision_debug_material: Material
+@export var _hit_particles_scene: PackedScene
 
 var _start_position: Vector3
 var _velocity: Vector3
@@ -52,6 +53,15 @@ func init(velocity: Vector3, start_position: Vector3, lifetime: float = 10) -> v
 	_lifetime = lifetime
 
 
+func hit(velocity: Vector3) -> void:
+	var hit_particles := (
+		_hit_particles_scene.instantiate() as Particles3DSelfDestructing
+	)
+	get_tree().get_root().add_child(hit_particles)
+	hit_particles.init(global_position, velocity)
+	set_velocity(velocity)
+
+
 func set_velocity(velocity: Vector3) -> void:
 	_velocity = velocity
 	_life_timer = _lifetime