[Gmsh] R: problem with surface creation

[Alessandro Vicini]

Ok, thank you Christophe. In the meantime I worked it out generating cones and deleting the surfaces I don't need.
So there's no "direct" way to do that from the gui, unless the surface is split so as to have 4 borders...

-----Messaggio originale-----
Da: Christophe Geuzaine [mailto:cgeuzaine at uliege.be] 
Inviato: martedì 2 luglio 2019 15:33
A: Alessandro Vicini <alessandro.vicini at sitael.com>
Cc: gmsh at onelab.info
Oggetto: Re: [Gmsh] problem with surface creation



> On 2 Jul 2019, at 11:05, Alessandro Vicini <alessandro.vicini at sitael.com> wrote:
> 
>  
>  
> With reference to the attached geo file, I’m trying to generate some 
> conical surfaces using “surface filling”, for example for the surface 
> bounded by circles 22 and 21; but I get the message “OpenCascade 
> surface filling requires a single line loop”…

You can use an OpenCASCADE "ThruSection" for that. In your case:

Curve Loop(1001) = 21;
Curve Loop(1002) = 22;
a() = Ruled ThruSections{1002,1001};

 
> If I switch to the built-in geometry kernel (which I would like to avoid), I get another kind of error message (1 border instead of 3 or 4).
> How can I work this out…? Thank you.

Nothing in the built-in kernel can do that: you'd need to subdivide the surface in 2 parts.

Christophe

>  
> Alessandro
>  
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—
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science  https://urlsand.esvalabs.com/?u=http%3A%2F%2Fwww.montefiore.ulg.ac.be%2F~geuzaine&e=9895bfa0&h=408b631c&f=y&p=y