Emmanuel,

Yes, my cylinder (corner pole of my house) starts at -1, is about 15 meters high and carries all different floors of the house; I've got 4 'poles' like that, one at each corner of the house!
Should be possible, or….?

If I drag the 'room surface' over the pole, it shows 'round'; if I don't it shows squared + like you say, a bit in a 'hole'….

Rgrds,

Ed