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using linked Models in revit 209

Comparing attachment to Overlay
Linked Revit models utilize what we will call a portability setting that is similar to the way Xrefs
are handled in AutoCAD. Although this setting is not exposed when you initially link a Revit
model, you can modify the setting by switching to the Insert tab and selecting Manage Links.
Change the setting in the Reference Type column as desired (Figure 6.9).

Figure 6.9
determining
the reference
type of linked
revit models

Attachment The Attachment option ensures that the linked model will be included if the
host model is subsequently linked into other hosts. For example, if Project A is linked into
Project B as an attachment, when Project B is linked into Project C, Project A will automati-
cally be included as well.
Overlay The Overlay option prevents linked models from being included if the host model
is subsequently linked into other hosts. For example, if Project A is linked into Project B as
an overlay, when Project B is linked into Project C, Project A will not be included. When you
initially link a model that contains other linked models with the Overlay option, you will be
notified that those links will be invisible (Figure 6.10).

Figure 6.10
notification of
nested models
using the over-
lay setting

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