On Land

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At Rill Architects we run ArchiCAD on Mac OS X. If you work at Rill, this is your stuff. If you don't, but you work in ArchiCAD, you may find something interesting. Anybody else, I don't know.
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Location: 13 Special Construction

For modeling a vaulted ceiling under a flat ceiling or a gable roof.

Barrel ceiling section
Heights are editable in 3D and section.

Turn on the Ellipse parameter for an elliptical curve. Other wise it's a simple arc.

With the Model View Options in 'ceiling mode', the object can use the optional ceiling pen, linetype, and cover fill. (Use the layer F Trim Crown, which shows in RCP and section/elevation combinations.)

Barrel ceiling in RCP

The Arc Lines option will draw lines with variable spacing to illustrate the curve:

Barrel ceiling arc lines

You can use the arc lines as a 2D-only symbol by turning the Model parameter off.

Download (Requires Slope macro)