Michael, the zoom factor cant be entered manually or even stored, am I right ?

Thats an amazing find - thank you !

Hi Tom, the zoom factor is part of the view definition, it will be saved when you save to a .3dm file and reload.

The zoom factor value for an ortho view does not have a spot in the regular UI for directly editing it but it can be accessed by script.

script: /* display top view zoom factor */ moi.ui.alert( moi.ui.mainWindow.viewpanel.getViewport( 'Top' ).fieldOfViewAngle );

script: /* set top view zoom factor */ moi.ui.mainWindow.viewpanel.getViewport( 'Top' ).fieldOfViewAngle = 30.0;

- Michael

Thats awesome.
So by entering the desired zoomfactor into the command line of the script I
can always return the "real world" size.

MOI feels like a silken glove - the smoothest workflow ever ;-)