weapon slots and loadout done

scripts/projectile.gd

@@ -0,0 +1,31 @@
+class_name Projectile
+extends RigidBody3D
+
+var damage := 0.0        # set by launch(), read by whatever we hit
+var _time_left := 10.0
+
+func _ready() -> void:
+	add_to_group("shift_with_origin")
+	body_entered.connect(_on_body_entered)
+
+## Call after add_child(). Configures this projectile from a def and sends it flying.
+func launch(def: AmmoDef, muzzle: Transform3D, speed_scale := 1.0) -> void:
+	damage = def.damage
+	gravity_scale = def.gravity_scale
+	_time_left = def.lifetime
+	global_transform = muzzle
+	linear_velocity = -muzzle.basis.z * def.muzzle_speed * speed_scale
+	reset_physics_interpolation()
+
+func _physics_process(delta: float) -> void:
+	if Vector3.UP.cross(linear_velocity).length_squared() > 0.01:
+		look_at(global_position + linear_velocity)
+
+	_time_left -= delta
+	if _time_left <= 0.0:
+		queue_free()
+
+func _on_body_entered(body: Node) -> void:
+	if body.has_method("take_damage"):
+		body.take_damage(damage)
+	queue_free()