SubfaceType Enumeration Members:
| Name | Description |
|---|---|
| 0 | A horizontal face at the bottom of the room, as defined by the room's level and base offset, or a face of the room that is bounded below by a room-bounding element. |
| 1 | A horizontal top face of the room as defined by the room's level and height, or a face of the room that is bounded above by a room-bounding element. |
| 2 | Any face which does not meet the criteria to be Top or Bottom. |