[Gmsh] gmsh Digest, Vol 127, Issue 27

[Mikhail Artemiev]

Hi Martin,

I haven't considered your problem very carefully, but what I would like to
say about compound lines is that once I tried to overcome the problem of
describing ruled surface by more than 4 lines (as you know ruled surface
should be described by line loop consisting of 3 or 4 lines) using compound
lines. I defined 4 compound lines. Each one consisted of several elementary
lines. This trick failed, and what I understood is that compound lines were
designed not for describing geometry entities but only to improve mesh
quality where it's possible.
Therefore looking at the line of your code where you define a line loop
consisting of compound lines, I am starting to think that there is
something wrong there.
Please correct me if my understanding of the idea of compound lines is
wrong.

Best,
Mikhail



> Sorry to insist, but I'm really stuck here. Hopefully someone can help me
> understand what's going on.
>
> I made a minimal example (minimal.geo), to illustrate my problem. I first
> merge the a couple STL files (STL.tar.gz), then create a couple Compound
> Lines, and then eventually a Line Loop. However, the order of Compound
> Lines seems to depend on whether or not I create the Line Loop (see
> lines-WithoutLineLoop & lines-WithLineLoop). Is that the expected behavior?
> Is there a logic behind this?
>
> One more thing I don't quite understand, is that even Points and Surfaces
> are names "ll" (see visibility.png). Is that related to the previous issue?
>
> Thanks in advance for your help!
>
> Martin
>
> On 08/22/2013 03:14 PM, Martin Genet wrote:
> > Dear GMSH people:
> >
> > I'm merging a bunch of stl files, and then work with lines & surfaces
> that I get using
> >
> > > ll[] = Line "*";
> > > ss[] = Surface "*";
> >
> > However, I can't seem to figure out the ordering of the lines &
> surfaces, especially since it seems to change from one run to another,
> depending on what I do with them. Any help with that? Thanks!
> >
> > Martin
>
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