Room preview
A small 3D extrusion of the room you have described. Drag to turn it.
Ask for a change
Describe the room and the controls above move to match. Try: twelve by twenty basement, eight foot ceiling, door on the first wall.
It moves the controls. It does not save anything, and it will not invent a measurement you
have not given it — if you say "make it bigger" it will ask what you measured.
It shows rooms. It does not make them. There is no handle to drag a wall with, because
a wall you can drag to make the room fit is how a measurement stops being a measurement.
Change the numbers above and the room changes; the room cannot change the numbers.
The boundary comes from the same generator the Layout Library uses, so an
L-shape here is the same L-shape there. Openings are placed by wall index and offset in feet —
the same contract as openings_json in the full viewer.