Hi OSTexo, thanks for the example. Probably at least at first you'll get 2 sets of lines in a situation like that. The most straightforward way to do things is to have lines hidden by surfaces, it's not very easy to make lines hide other lines.

Later on it could be possible to add a kind of "remove duplicates" type step, that might help to clean up some things. But that probably wouldn't happen initially at least.

- Michael