Construction Documents and Details

BIM for Architecture, Engineering, and Construction Curriculum


Creating Annotated Section Views

What is the essential difference between annotations and model elements?

Model elements represent true model objects and any changes to them are immediately reflected in all views in which they appear. Annotations are view-specific. They can be copied between views, but each annotation remains independent and can be changed in each view.

Are annotations in a view static or dynamic?

All dimensions are dynamic and are automatically updated as the model elements they reference are moved or resized. Dimensions can be locked to constrain the movement of model elements and prevent further changes. 

Text is typically static and is not updated as model elements change. One exception is keynotes, which will update in views if the underlying keynote is changed.

Tags are dynamic and are updated as the underlying values in the model database are changed.

Can we annotate views dedicated to specific design options or phases?

Yes. Annotations can be added to any views to explain the unique features of specific design options or projects phases.

How can annotations placed in a specific view be reused in other similar views?

Annotations can be copied to the clipboard and pasted into other views. Another strategy is to duplicate an existing view with detailing, thus creating a new view that include all the annotation. Finally, we can export a view including its annotations as DWG file and import it into another project.

Creating Details and Callouts

What are the advantages and disadvantages of using drafting views versus detailed model views?

Drafting views offer a quick way of incorporating information, but since they are not linked to the model, they do not ensure consistency as the model changes. Detailed model views use the underlying model to generate the geometry shown. While this provides the benefit of propagating changes, it also requires you to verify the accuracy of the added annotations relative to the dynamic model elements.

If a view tag does not show a view and sheet number, what does this indicate?

Empty view tags indicate that the referenced view has not yet been placed on a sheet. The tag will be filled in with the view and sheet number when the view is placed.

Can a view be referenced by more than one callout?

Yes. When placing a callout you can choose to create a new detailed model view or to reference an existing view, including drafting views and detailed model views. It is common practice to place callouts referencing a detail at all locations where the detail information is relevant.