When using Sweep 1 rail in RhinoCommon I get a different result than by using the command in Rhino.
The command gives me 1 polysurface, while the method gives me multiple. Is the command doing other things behind the scenes that the method is not doing?
Can you post a simple model that has a set of curves you want the sweep and the results you expect to get? Also, include a screen capture of the Sweep1 dialog box.