Autodesk 256B1-05A761-1301 - AutoCAD Revit Structure Suite 2010, Руководство пользователя

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■ Looser constraints (such as dimensions and alignments that are not locked) are often maintained unless
a conflict occurs, in which case these constraints may be removed without notice.
■ Implied constraints (such as a wall attached to a roof, or 2 walls joined at a corner) are also maintained
unless a conflict occurs.
These explicit and implied constraints require that each element knows about the other. That is, one element
must reference the other element.
When you are referencing elements in design options, consider the following guidelines:
■ Elements in the main model and in the primary option can reference each other.
■ Elements in a secondary option can reference elements in the main model. See Selecting Elements in
Design Options and the Main Model on page 1314.
■ Elements in the main model cannot reference elements in a secondary option. Therefore, elements in
the main model do not change their shape or properties when you are editing a secondary option. For
example, if you sketch 4 walls in the main model and then sketch a roof in a secondary option, the walls
do not regenerate and attach to the roof.
■ If main model elements need to update with and reference elements in secondary options, move the
main model elements into each design option (or selected options) in the design option set. Then edit
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 1313.
■ 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 1315.
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.
1322 | Chapter 22 Design Options