default fromRoom to the parented room is it's parented to a room

fast64_internal/oot/actor/properties.py

@@ -1,3 +1,5 @@
+import bpy
+
 from bpy.types import Object, PropertyGroup, UILayout
 from bpy.utils import register_class, unregister_class
 from bpy.props import EnumProperty, StringProperty, IntProperty, BoolProperty, CollectionProperty, PointerProperty
@@ -165,8 +167,23 @@ class OOTTransitionActorProperty(PropertyGroup):
     cameraTransitionBackCustom: StringProperty(default="0x00")
     isRoomTransition: BoolProperty(name="Is Room Transition", default=True)
 
+    # internal usage only
+    isFromRoomSet: BoolProperty(name="isFromRoomSet", default=False, get=lambda self: self.updateFromRoom())
+
     actor: PointerProperty(type=OOTActorProperty)
 
+    def updateFromRoom(self):
+        if self.fromRoom is None:
+            for obj in bpy.data.objects:
+                if (
+                    obj.type == "EMPTY"
+                    and obj.ootEmptyType == "Room"
+                    and bpy.context.view_layer.objects.active in obj.children_recursive
+                ):
+                    self.fromRoom = obj
+                    return True
+        return False
+
     def isRoomEmptyObject(self, obj: Object):
         return obj.type == "EMPTY" and obj.ootEmptyType == "Room"
 
@@ -204,6 +221,9 @@ def draw_props(
         headerProps: OOTActorHeaderProperty = self.actor.headerSettings
         headerProps.draw_props(actorIDBox, "Transition Actor", altSceneProp, objName)
 
+        # execute fromRoom get function
+        _ = self.isFromRoomSet
+
 
 class OOTEntranceProperty(PropertyGroup):
     # This is also used in entrance list.