Break Areas

This command/action is available on the Modify Objects dialog and on the context menu of any closed polygon. The area used as cutting object may cover the area to be cut partially or may also be entirely inside the area to be cut.

When the Break Areas function is called via the context menu, only active objects are broken (inactive ones are ignored).

Example 1

The area 1 (here: area source) shall be broken by area 2 (here: parking lot).

Enter an area source and an overlapping parking lot as illustrated.

Select them command Break Areas from the context menu of area 2.

Consequently, area 1 is cut - in this example - into three parts.

Click on border of area 2 being located inside area 1.

The dialog Select Object is displayed:

Click once onto the second object from the top down and click on button „Mark“ afterwards.
When have closed the dialog the part of the area source being cut can be relocated.

Relocated part of the area being cut

Delete this part been cut via its context menu (or by the DEL-key) and delete the second lower part of the area source been cut.

Result: area 2 breaks area 1

Example 2

Starting from the same initial situation, the command Break Areas been selected from the context menu of area 1 causes area 2 to get broken. The result is illustrated on the following figure.

Result: area 1 breaks area 2

Example 3

In this example, the cutting area is entirely inside the area to be broken.

Enter two buildings - one inside the other - having 8 m height as illustrated below.

Initial situation: building inside building

Select from the context menu of area 2 (inner building) the command Break Areas.

Subsequently, small inner area punches a „hole“ into the larger outer area. The connecting line is a small „channel“ enabling to draw the new ring polygon from a single closed polygon.

When clicking on the inner ring polygon three building objects are displayed on the dialog Select Object.

Delete the last two entries from the list on dialog Select Object.

Finally, in the file just a single building remains.

Result: area 2 breaks area 1

Press the key-combination CTRL+3 to display the building with courtyard in 3D-Special view.

Break Areas via Modify Objects

The action „Break Areas“ is also available when having selected the command Modify Objects from the context menu of the breaking object. In the selection for „Object Type“, define which objects are to be broken by the selected one. Additionally, the activation and/or condition settings available in the Modify Objects dialog can be used to further filter the objects to be broken.

Example 4

The highlighted triangular shaped area source shall break only the parking lots, but not the areas of land use.

After selection of the command Modify Objects from the context menu of the area source, select as action “Break Areas“ and for the object type „Parking Lot“. Further, select for „Range“ the option „On Border“. After execution of the command, just the two active parking lots are broken at the intersection point area source‘s polygon, but not the areas of land use.