Make walls see-through and locking an object on its ground

[Ricky]

Hi there,

I scanned a room and want to take some measurements from within. I would like the scan "to be locked on the ground" if that makes sense, so I wouldnt be able to flip it upside down and it would be easier to move around. I found the option "lock rotation about an axis" which kinda works but doesnt allow different angles (obviously).
Also for now I can only see the "outside" of the room, yet I'd like to be able to see inside. I believe the algorithm to allow that is called "backface culling" and basically works by discarding polygons whose back faces are not visible to the viewer.

My questions are:
a) Is there an option to define a certain plane (x-z in my case) as "ground" plane and stop the object of flipping in "unnatural" positions?
b) Is there an option to enable backface culling or something similar that allows the view into an object that is scanned from within?

This is the link to the file: https://drive.google.com/file/d/1Vy8iJb ... sp=sharing

[daniel]

1) No sadly, even if it has been requested a few times already

2) No, but you can use the 'Perspective' camera projection mode, and define a larger 'Near clipping depth' value in the Camera settings dialog.