(2020-12-14, 15:03)Orion Pobursky Wrote: Heck, I'd be happy with a function that simply mirrors the matrix of a selected subfile. I can position manually.
Do you mean literately mirroring the matrix (negative determinant) or smart mirroring like normal (flips two axis)?
If you mean the later you can do that by checking the 'incl models' checkbox in the selection mirroring dialog.
This should work as long the sub-model itself is symmetric along the x-axis.
The first method is not really supported as LDCad's rendering optimizations won't correct for the flipped normals.
Or just duplicate the session and mirror the whole thing from the session menu.