ReadonlyboundsThe IfcDoor / IfcWindow in the opening (IfcRelFillsElement); null for a bare opening.
The voided wall or slab (IfcRelVoidsElement.RelatingBuildingElement).
Its current coordinates, native units.
The opening placement's Location point: Offset is its x, Sill its z (native units).
Along the host's local X to the opening's placement origin, metres (the centre, for an authored one).
The opening's bottom above the host's placement origin, metres.
Cut bounds in the host's placement frame, in the file's native units.