I absolutely love Sweethome!
Ticket 777 touches on the suggestion I have.
See the attached sh3d file. The scheme is a proposed conversion and extension of an existing listed derelict
(protected) house. As you can see the roof is rather complicated.
It took me a long time to construct the roof out of furniture and, as you can see, the pattern (roof tiles) on the individual pieces do not align. Also it was very difficult to match the joining of the roof sections internally (see where the bathroom gables are joined to the main cottage roof).
For simple roofs the furniture method works well but is cumbersome when the roof become more complex.
I am therefore suggesting what I call a "subtractive' method of construction where say a pitch roof is first built complete and then an inverted "V" is cut from it to allow for the insertion of a gable or dormer roof in a similar way that a door or window automatically cuts a hole in a wall as it is offered into position. The "V" cut is required in order to povide for the necessary internal ceiling height.
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