Hi niko yeah currently without using any other program you need to get angled and scaled profiles into the corner junctures, then build sweeps between each of those.

A shortcut for getting the angled and scaled profiles is to make a polyline for the rail - if the rail is only made up of line segments then you can get a mitered corner sweep for it in MoI even if the whole rail is not on one plane.

So for example try sweeping the attached 3DM file in MoI - here I've drawn in a polyline for the rail instead of the original one that had slightly curved segments.

That produces a result like this directly in MoI:




If straight sections are ok then you are done there actually.

But if you want curvy sections, you will then want to extract the edges at the polyline miters by selecting them and doing Copy + Paste, and then do a sweep on each curved segment individually, between those profiles.

- Michael