> Why the profile has not continued along the angle?

It's because it will involve extra work on my part to do the calculations for mitering corners like this. I do expect to add this eventually but it will take a while.

The sweeps have to be extended and intersected with each other for this to work as expected. In the meantime it treats a multi-segment rail curve as if it was individual segments.

For now, you can either make the extended lines and trim things back manually, or use an alternative construction technique - here is a thread that talks about this: http://moi3d.com/forum/index.php?webtag=MOI&msg=297.1

- Michael