Hi Michael,

Yes, in many cases it is possible to obtain the same result of a Rail Revolve operation using the Sweep command. But I think there are some exceptions.

The following example uses a 3D path, and the results produced by MoI and Rhino are different:





Rotating the curve 1 by 90° (2), then scaling it by 1 direction twice (3-4), you get the curve for a sweep.



Unfortunately, the surfaces have some artifacts, but in principle this works.



Anyway, as people often says, "Rome has not been done in a day....". And I think that MoI, as a joung product, is much more than expected!