# Floor Holes and Building Edges

Floor Holes do exactly what they sound like: they cut holes into the floor! This is useful for:

* Creating atriums
* Cutting holes for stairwells
* Stacking up multiple seating levels in an auditorium or stadiums

Additionally, the Floor Holes tool can be used to create Building Edges, which is essentially a reverse floor hole. A Building Edge simply cuts away the floor outside the building.

<figure><img src="https://1547340717-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FzUQ3TfKTYBeb6nf9W8Hv%2Fuploads%2Fnxmlz0Nud6QD4K3t7xVf%2Fbuilding-edges.png?alt=media&#x26;token=0ce0588c-061c-4e3a-b3bf-0e8a87338d05" alt=""><figcaption><p>A multi-floor building with no Building Edges defined.</p></figcaption></figure>

<figure><img src="https://1547340717-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FzUQ3TfKTYBeb6nf9W8Hv%2Fuploads%2Fb0wK4a20IBXkfPOmye2u%2Fno-building-edges.png?alt=media&#x26;token=774c169c-fdc3-4bff-94f2-36969ebdf511" alt=""><figcaption><p>A building with Building Edges defined. The same Building Edge was copied and reused on floors 2, 3, and 4. The ground floor does not have a Building Edge defined.</p></figcaption></figure>

## Drawing Floor Holes and Building Edges

Floor Holes / Building Edges are drawn an edited exactly the same as other area-type objects, such as Attenuating Objects, Scope Zones, and Capacity Zones. To learn how to draw Floor Holes / Building edges, see [Drawing Attenuating Objects](https://docs.hamina.com/planner/simulation/attenuating-objects#drawing-attenuating-objects).

### Switching from Floor Hole to Building Edge

When a Floor Hole zone is drawn, Hamina Network Planner will automatically designate it as a Floor Hole or a Building Edge. To manually change it:

1. Activate the **Edit** tool.
2. Right-click on the edge of the Floor Hole zone (not inside the zone, and not on a point on the edge).
3. The contextual toolbar will appear, where you can choose between **Floor Hole** or **Building Edge**.\ <br>

   <div align="left"><figure><img src="https://1547340717-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FzUQ3TfKTYBeb6nf9W8Hv%2Fuploads%2FVGCmPjHNibmlKx3ojiSb%2Ffloor-hole-contextual-toolbar.png?alt=media&#x26;token=14596af5-ab58-4e45-9aaa-51b661a0a742" alt="" width="364"><figcaption></figcaption></figure></div>

### Converting a Scope Zone to a Building Edge

Hamina Network Planner uses machine learning to automatically draw a Scope Zone, which is often similar or identical to the desired Building Edge.

It isn't yet possible to convert a Scope Zone to a Building Edge in Hamina, but this can be achieved with an external tool such as [clipboard.potatofi.com](https://clipboard.potatofi.com/). *<mark style="color:blue;background-color:blue;">Note: This is a 3rd party tool by a Hamina employee, but is otherwise unaffiliated with or supported by Hamina.</mark>*

To convert a Scope Zone to a Building Edge:

1. Use the Edit tool to select the Scope Zone in Hamina.
2. Press <kbd>Command</kbd> + <kbd>C</kbd> or <kbd>Ctrl</kbd> + <kbd>C</kbd> to copy it to the clipboard.
3. Open [clipboard.potatofi.com](https://clipboard.potatofi.com), and click the green **Paste from Hamina** button.
4. Use the **Convert Zones and Objects** tool to convert the zone to a Building Edge.
5. Click the blue **Copy to Clipboard** button.
6. Back in Hamina, press <kbd>Command</kbd> + <kbd>V</kbd> or <kbd>Ctrl</kbd> + <kbd>V</kbd> to paste the zone back into Hamina.
7. While the zone is still selected, left-click and drag using an empty edge (not a point) on the zone to drag it into position on the building.