[Gmsh] EXTERNAL: Re: Meshing Error in v4.0.4?

[Jensen, Aaron J.]

Fantastic!  I'll download the latest snapshot.

Thanks,
Aaron

-----Original Message-----
From: Christophe Geuzaine [mailto:cgeuzaine at uliege.be] 
Sent: Thursday, November 15, 2018 2:14 PM
To: Jensen, Aaron J. [US-US]
Cc: gmsh at onelab.info
Subject: EXTERNAL: Re: [Gmsh] Meshing Error in v4.0.4?



> On 4 Nov 2018, at 15:03, Christophe Geuzaine <cgeuzaine at uliege.be> wrote:
> 
> 
> 
>> On 30 Oct 2018, at 23:19, Jensen, Aaron J. <Aaron.J.Jensen at leidos.com> wrote:
>> 
>> Hello,
>> 
>> I am working on a fairly complicated 3D model and mesh using gmsh that requires OpenCascade (for Boolean operations mostly).  I have been running into some odd issues near some of the edges which I originally thought might be overcome by modifying my Boolean operations.  However, after quite a bit of testing I found the problem occurs for even a simple script:
>> 
>> SetFactory("OpenCASCADE");
>> Mesh.CharacteristicLengthMax = 1.0;
>> Cylinder(1) = {0, 0, 70.0, 0, 0, 60.0, 50.0}; 
>> 
>> I set all of the gmsh options to their defaults except for viewing element faces and you can see the resulting image attached.  I finally discovered that this does not occur in version 3.0.6 of gmsh but it does occur in version 4.0.4.  Have you seen this behavior?  I presume this is a bug or there is a flag of some kind that I need to set?
> 
> 
> Thanks for the report - this is indeed a bug.

This is now fixed in Git.

Cheers,

Christophe



> As a workaround force e.g. the frontal algorithm:
> 
> SetFactory("OpenCASCADE");
> Mesh.CharacteristicLengthMax = 1;
> Cylinder(1) = {0, 0, 70.0, 0, 0, 60.0, 50.0};
> Mesh.Algorithm = 6;
> 
> Christophe
> 
> 
>> 
>> Thanks,
>> Aaron
>> <gmshCylinder.png>_______________________________________________
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> 
> — 
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science 
> http://www.montefiore.ulg.ac.be/~geuzaine
> 
> Free software: http://gmsh.info | http://getdp.info | http://onelab.info
> 

— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

Free software: http://gmsh.info | http://getdp.info | http://onelab.info