So I guess I made the top right surface in Alias once upon a time (I can’t find it anymore and I no longer have a license for it anyway and possibly this export has been changed through Solidworks), because when I try now in Rhino, the surface blows up like a balloon:
Well, the sweep sections are simply scaled and rotated across the gap - there is no information, as far as that command is concerned, to tell it what goes on in between. NetworkSrf also does some better thinking about what the shape should look like, it does not just create sections the way Sweep2 does.
First, it’s a bit weird that the dialog uses radio buttons, yet no option is selected (or can be selected) in the “frame style” and for me, the buttons don’t look disabled…
Second, there’s no easily accessible non proportional viewport scaling in Rhino so I had to scale up the object itself and mirroring it across the X axis there’s still som ballooning happening, even though the rail is planar…