Negative elevation floor not visible

[Plus_f]

Hello,
i created a 2 level with negative elevantion.
- Level -1: H240, Elevation -240
- Level -0.5 h240 elevation -120
- Level 0 H250 Elevation 0
Wen I select the level -1 I cannot see in 3D the rooms because it seems there are ceiling/floor that hide the view.
How can I correct that?
This problem strarted after I wotked on level -05 I think.
Many thanks

[Puybaret]

Try to select the Display selected level menu item.

[Plus_f]

Hello, thanks for the replay but i arleady have "display selecter level" and it dosen't work.
I see all the level "covered" in the 3d. Maybe could be linked to the fact I see item placed in the -1 visibile in -0,5?

[Keet]

With "Display selected level" you see that level and visible levels below it.
But your numbers for the bottom levels are not all correct which might skew your view. If your floor thickness of level 0 is 20 your level -1 with a heigth of 240 should have an elevation of -260 (-(240+20)). That is assuming you want level -1 to seamlessly touch level 0.

Check this manual about levels: Levels Explained

[Plus_f]

I fixed the problem, but it wasn't related to the height and elevation. The problem was that I surrounded the project with rooms al level -0 when i deleted one side the 3D appeared correctly.