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each design option to modify those elements as desired for each design. See Moving Elements from the
Main Model to a Design Option Set on page 1246.
■ View-specific elements can reference elements in design options. For example, you can dimension
elements in a view that is dedicated to a design option. See
Annotating and Detailing Design Options
on page 1249.
Interdependent Elements in Design Options
Elements that depend on another element must be in the same design option. Interdependent elements
include the following:
■ Inserts that cut their hosts (such as windows in walls or skylights in roofs)
■ Host sweeps and their hosts (such as wall sweeps and walls)
■ Topographical surfaces and building pads
■
Curtain panels, mullions, and grids
If you add the host to a design option, the hosted element is automatically included. If you try to add the
hosted element without the host, Revit Architecture warns you that the host must also be added.
When you create groups or arrays, selected elements must be in the active option. If no design option is
active, they must be in the main model.
If you add elements to a group, the elements must be in the same design option as the group.
Design Options and Rooms
A room is a model element, so you can add rooms to a design option. As a general rule, the perimeter, area,
and volume of the room are defined by the room-bounding elements available to that option. These
room-bounding elements include elements in the main model, elements in primary options of other option
sets, and elements in the secondary option itself. However, a room in a secondary option cannot reference
elements that are defined in other secondary options.
Room-bounding elements can include walls, room separation lines, roofs, floors, ceilings, columns, and
curtain systems whose Room Bounding parameter is turned on. (See
Rooms on page 913 and Room-Bounding
Elements on page 917.)
For information about errors regarding rooms in design options, see Option Conflict Between Rooms on
page 1261 and Room Option Conflict on page 1262.
Room Areas and Perimeters for Design Options
When determining the perimeter and area of a room, Revit Architecture uses the following rules:
■ A room placed in the main model is defined by room-bounding elements in the main model and all
primary options. The room ignores walls and room separation lines that belong to secondary options.
■
A room placed in a design option is defined by room-bounding elements in that option, in the main
model, and in primary options of other option sets. The room ignores walls and room separation lines
that belong to secondary options of other option sets.
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