Sometime I need another to make the job done, like this sweep ‘Flat’ option. in MOI, the ends can be twist to a direction. That is very useful, is it possible to add this feature in Rhino?
copying the profile to the end = one and a half seconds. mmmaybe a half a second longer than clicking some esoteric options, aaand then you can even rotate it however you want 
I tried to twist the end but not successful, what is the right way to rotate the end surface?
as i mentioned it. just copy the profile to the ends. then use those to sweep. you can either use 3 including the center if you want it to grow in diameter, or you simply use 2 one at each end which will result in your “flat” sweep without diameter change.
Ah I see. Thanks a lot!