I have lots of situations where I need to select ONLY the area within the walls of my model. I’d like to be able to create a box/plane that essentially outlines the perimeter of the room, so that I can copy/paste that perimeter into a new model and begin working with the geometry of that room.
The image I’m showing below is very simple, but typically my walls are far more dynamic.
ok, I assume the floor and the walls are in separate groups in your screenshot.
you could
redraw the perimeter of the room, while inside the floor group. not just the doors and corridors, but the whole perimeter.
select your top face (in the floor group), right click on it, and intersect with the model. it’ll draw on the face the contour of all the elements that intersect it. off course, it’ll work if you have the walls visible. if you have more things sitting on the floor, then you’ll get more lines. you might still need to draw lines on the doorways, depending when you’re doing this operation (before or after implementing the doors)