Hello,

Does the ACIS kernel support natural curve extension? It would be helpful to have natural curve extension and extension up to another curve so the Make2D output can be cleaned up nearly 100% in MoI prior to export into other vector programs downstream. It would also be helpful when making curve networks for surfaces. Is it possible to have Make2D output an overall outline as well as visible and invisible lines as different styles? Thanks.

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

Hello Michael,

Thanks for the explanation. It's in an old CATIA video I saw but I'm thinking Extend is what I'm looking for, not extrapolate, so the curve can follow its natural progression. I think the behavior that VSR calls extrapolate is the same as the CATIA extend? The terminology seems to flip flop depending on the application, e.g. Altair calls a CATIA extrapolate natural extend.

https://www.youtube.com/watch?v=xk748plEtMM

Being able to do a CATIA type Extend on a curve would be great, being able to extend the curve up to another line would be icing on the cake.

As far as the outline curves are concerned it sounds like it only something that can be done when exporting since the outline creation depends on the raster layer?

Thanks.