Sweep2 kink from smooth curves

Sweep2 is creating a kinked surface from smooth curves when the “Refit with” a specified tolerance option is used.
Sweep2 Kink.3dm (81.4 KB)
The long curves are the rails; the short curves are the sections. The curves are smooth. The exact location of the kink(s) in the surface changes with different tolerances for the Refit option.

Sweep2 should always generate a smooth curve if the input curves are smooth. For this set of curves the surface is smooth if “Do not simplify” option is used, but the surface is kinked if the “Refit within” option is used.

Version 5 SR13 64-bit
(5.13.60523.20140, 5/23/2016)

Options used:

Curves used:

Kinked surface:

Hi David - thanks, checkin’ it.