Is building vision broken?

[Dimossa]

It doesnt let you see the first floor, just removes wals front second and the roof.

[YetiChow]

building vision removes levels of the building in line with your current camera view height -- try moving your camera higher so that the "slice level" is above the floor you want to see. You can use slice view to make sure your camera's level is where you want it (IIRC slice view doesn't slice through buildings though, only terrain.)

Also, if you've built with the "custom blocks" tool make sure that you've set the normals appropriately -- when you're placing blocks (either individually or a large section of them) you'll get an arrow on the face pointing outwards from the block, and you can change the direction it's pointing; this allows you to set the "front" of the block which tells the game which directions the block should be hidden from and which it should remain for when you're in building view (i.e. so that the camera doesn't show it when you're looking from angles where it makes sense not to, but does show it when it's not actually blocking the inside of the building.)