So here's my problem:
1) there are two polylines. The first with degree 1 (red) and the second with degree 2 (cyan)
2) after 'join' command the closed polyline become degree 2
Here's the question:
Is there a way to join two polylines with different degrees and create a new polyline with initial information of degrees between segments?
In my opinion it keeps 3d model cleaner.