Hi OSTexo,

re:
> Does the ACIS kernel support natural curve extension?

Can you post an example? There is a NURBS extension method usually referred to as something like "polynomial extension".

That name "Natural" is probably a term made up by a particular app.


> Is it possible to have Make2D output an overall outline as well as visible and
> invisible lines as different styles?

It doesn't try to make an outline for Make2D currently because there isn't a way to keep a separate stroke width or clipping by a shaded background image when exporting those curves later on.

What I mean is that when generating a hidden line drawing by export to PDF, AI, or SVG formats the outline is meant to look like this:



It's clipped in half by being below the shaded background image and has a larger width than regular visible curves.

- Michael