But seriously, I use Pix4d daily and I’m not sure how you’d do this. If you fly a grid pattern, you won’t get side detail. If you fly an orbit, you won’t be able to get the edges.
How tall are the ceilings in comparison to the stock? How close are things located to the walls. Maybe I’m just imagining the wrong thing, but you really need a lot of extra space around the thing(s) you’re trying to map to make a 3D model/measure volume/etc.