Delete Existing Buildings From The Map on Arma 3
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Open the "mission.sqm" file with the editor.
Now pick a building that you want to remove. In this case it is the barracks at Kavala marketplace.
Click on "ID" at the top. Many numbers will appear. Zoom in on the building as close as possible until you see the ID of the building.
Double-click on the building so that a window opens. Click there on "Empty->Objects (helper)->Lawnmower (small)". On the right you will see an empty field. Insert the following there:
this enableSimulation false; this allowDamage false; delh = [0,0,0] nearestObject 1779863; delh hideObject true; delh = [0,0,0] nearestObject HIEROBJEKTID; delh hideObject true;
You have to swap "HIEROBJEKTID" for your ID. In the example it would look like this
this enableSimulation false; this allowDamage false; delh = [0,0,0] nearestObject 1779863; delh hideObject true; delh = [0,0,0] nearestObject 1117336; delh hideObject true;
After that is done, click on Preview and the building is gone!