Many rooms are not rectangular, and in fact having angled walls or a vaulted ceiling is desirable.Unfortunately, with angles there is no direct way to determine the room modes exactly.

• 许多房间并不是规正的方形，有时有斜的墙，有时有拱顶，所以在这种情况下就难以直接确定房间长宽高的精确尺寸。