Thx for the hemi sphere methods

About problem of name of file and IGES format here just inside MoI !
Try that
Make a "cube solid" save as name "Cube" in 3dm format
Now always in MoI "save as" IGES format, same name "Cube", MoI (windows(?) said "cube.3dm" "soon exist !!!!
"would you erase it Yes/ No", if Yes the cube is saved in 3Dm format not in IGES format???
Idem if you make an "Export" IGES
Now, no problem is you take for example "Cube1", now the IGES file is cool exported or saved :)
I believe that is more a problem of windows file names management than a MoI bug :)

And it's for me reproductible at any time!

Ps For the Tabkey for Top / Bottom yes anything you want :)
But we will be able to use the "bottom view" as the "Top view" for draw, move objects etc...?