Inclined ceiling is already supported partly.
As explained in the help:
The height of the ceiling of a room is computed at each point of the room, and the height at each of these points is equal to the height of the closest start or end point of a wall. This allows to create the ceiling of a garret when you set different heights at the start and end points of sloping walls.
See the attached file to this message for an example.
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InclinedCeiling.sh3d
(24381 bytes)
(Download count: 46493)
(Example of an inclined ceiling)----------------------------------------
Emmanuel Puybaret, Sweet Home 3D creator
