The Roof tool allows you to create roofs of various configurations on the scene.
To activate the Roof tool, click the 
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It is recommended to draw the roof on a dedicated floor.
You can draw the roof of the following shapes:
— Sloped roof. To start drawing: press the LMB. To finish drawing: press the LMB.
— Rectangle. To start drawing: press the LMB, drag, press the LMB. To finish drawing: drag, press the RMB.
— Sphere by center and radius. Drawing: LMB.
— Cylinder by the centers of the bases. Drawing: LMB.
— Cone by center and radius. Drawing: LMB.
You cannot set the shape parameters during drawing “sloped roof”, “sphere”, “cylinder”, and “cone” roofs. All shape parameters for roofs of these shapes can only be configures after placing the roof on the scene.
You can select the material of the roof both before and after placing the roof on the scene.