Irregular "free-form" shapes can be modeled using the mesh tool. These items can be converted to roofs with this Add-On.
Start this installer and follow the instructions. The add-on will be automatically loaded the next time you start ArchiCAD.
The new "Create Roofs from Mesh" command will appear in the "Design/Design Extras" menu by default.
The selected mesh object(s) can be transformed into grouped individual roof planes.
The individual roof planes can be deleted or edited further, their pitch can be modified, etc.
There are more editing options for the resulting surface patches than for the mesh object they originated from.
The software is provided to you "AS IS" and you acknowledge that it may contain errors. Graphisoft disclaims any warranty or liability obligations of any kind.