Hi Steve,

> The one rail sweeping does not work for this example, there
> are various problems.

For 1 rail sweep you'll probably want to do it with just 1 profile and a planar rail which will enable mitered corners. That means that you would make something like flared ends by slicing tips off of a more regular initial shape, rather that incorporating the angled end parts directly into the surface construction.


> Network gives the same result as 2 rail sweep in this example.

This is the one that I can probably tune up in v3, it's related to that combining together of things that are within a close angular tolerance of being G1. I think I should be able to detect the case that the inputs are made up only of line segments and make sure that the output has the same segmentation in it.

This is the one that if you had a bit fewer segments in the curves where each line was not so close to being tangent to its neighbor, you would not get that combining effect.

- Michael