update

portal/gate.gd

@@ -0,0 +1,34 @@
+extends StaticBody3D
+
+@export var target_scene: String = "res://dungeon/dungeon.tscn"
+@export var is_exit: bool = false
+
+var active := false
+
+func _ready() -> void:
+  if not is_exit:
+    if GameState.dungeon_cleared:
+      queue_free()
+      return
+    get_tree().create_timer(0.5).timeout.connect(_check_overlapping)
+  else:
+    get_tree().create_timer(1.0).timeout.connect(func() -> void: active = true)
+
+func _check_overlapping() -> void:
+  active = true
+  for body in $GateArea.get_overlapping_bodies():
+    _on_gate_area_body_entered(body)
+
+func _on_gate_area_body_entered(body: Node3D) -> void:
+  if not active:
+    return
+  if body is CharacterBody3D and body.name == "Player":
+    GameState.save_player(body)
+    if is_exit:
+      GameState.returning_from_dungeon = true
+    else:
+      GameState.portal_position = global_position
+    call_deferred("_change_scene")
+
+func _change_scene() -> void:
+  get_tree().change_scene_to_file(target_scene)