mortar + mini gun cannot hit weak points

player/projectile/mortar_projectile.gd

@@ -0,0 +1,17 @@
+class_name MortarProjectile
+extends Node3D
+
+var velocity: Vector3
+
+const GRAVITY := 40.
+
+func _process(delta: float) -> void:
+	position += velocity * delta
+	velocity += GRAVITY * Vector3.DOWN * delta
+
+	if position.y <= 0.:
+		var explosion := preload("res://player/explosion/explosion.tscn").instantiate()
+		explosion.position = position
+		add_sibling(explosion)
+
+		queue_free()