On Land

Environment Information
At Rill Architects we run ArchiCAD on macOS. 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.

Location: 01 General / Drawing Tools

System requirements:
Accessories add-on in Add-ons folder

An accessory as a special object that can be associated with another element. When you edit the element, the accessories edit themselves to keep up. This kind of automatic geometry is rare in Archicad, and welcome. Yet the accessories live in the limbo of semi-features known as the Goodies, where they are not installed by default, and you have to download them, and they're soaked with disclaimers. Anyway.

This accessory traces the slab perimeter with a line that can switch its parameters in response to the ceiling switch. So, while that switch only works on objects, by using an accessory (object) we can trick it into working on slabs too.

The main application is a continuous soffit around a room. You should build such a thing with a slab with one big hole in it. With the accessory, you can show the hole perimeter correctly in plan and RCP. The slab would go on the A Ceiling3 layer, and the accessory object would go on A Ceiling All.

The parameters are the same as ceiling line. The only additional option is Holes Only. This traces only the holes within the slab, not the main polygon.

To place the accessory on a slab:

Select the slab.

On the Design menu, Design Extras -> Accessories -> Slab Accessories...

In the object dialog that pops up, choose the Ceiling Line Aceessory.

When you edit the slab, the lines will update automatically.