Using a "disintegrator" to make square corners?

[Noisy Rhysling]

St. Anne of Mcaffrey tells us that the original colonists on P.E.R.N. used some kind of disintegrator to make the rooms and such for the original holds and weyrs. I picture the corners as being razor straight and a perfect cube where walls meet floor. What I don't get is how such a machine might do that. Any reasonable suggests? Any unreasonable ones? I'm stuck. ...---...

 

[Vanadium 50]

I saw the same thing in One Froggy Evening.

Just have your disintegrator have a fixed range. Perfect corners, every time.

 

[Noisy Rhysling]

I saw the same thing in One Froggy Evening.

Just have your disintegrator have a fixed range. Perfect corners, every time.

What about when two walls and the floor meet? that "half a cube" area.

I think you could regular corners by just having it a set distance from the wall on its side?

 

[Noisy Rhysling]

Shy person says "microfocusing the beam." Given a ranging system that would work. Collimating lens to get the corners tight.