[Gmsh] Boolean Fragments. Créate 3d mesh from surfaces. Surface Loop creates aditional surfaces
Jacob Abdelfatah Ndioubnane
jacoban90 at outlook.es
Wed Feb 7 19:51:04 CET 2018
Perfect. The problem was related with the previous builds.Now is totally solved. Thank you very much for your time.
Best Regards
Jacob
Enviado desde Correo<https://go.microsoft.com/fwlink/?LinkId=550986> para Windows 10
De: Christophe Geuzaine<mailto:cgeuzaine at uliege.be>
Enviado: miércoles, 7 de febrero de 2018 18:41
Para: Jacob Abdelfatah Ndioubnane<mailto:jacoban90 at outlook.es>
CC: gmsh at onelab.info<mailto:gmsh at onelab.info>
Asunto: Re: [Gmsh] Boolean Fragments. Créate 3d mesh from surfaces. Surface Loop creates aditional surfaces
Use the latest automatic snapshot: it contains many improvements w.r.t. opencascade.
On 7 Feb 2018, at 19:26, Jacob Abdelfatah Ndioubnane <jacoban90 at outlook.es<mailto:jacoban90 at outlook.es>> wrote:
Thank you for your answer. I tried your boolean fragments command and gets me in that line the following error:
Info : Reading 'C:\Users\Jacob\Documents\Cube\Cube.geo'...
Info : Reading 'C:\Users\Jacob\Documents\Cube\Inlet.brep'...
Info : Done reading 'C:\Users\Jacob\Documents\Cube\Inlet.brep'
Info : Reading 'C:\Users\Jacob\Documents\Cube\Walls.brep'...
Info : Done reading 'C:\Users\Jacob\Documents\Cube\Walls.brep'
Info : Reading 'C:\Users\Jacob\Documents\Cube\Outlet.brep'...
Info : Done reading 'C:\Users\Jacob\Documents\Cube\Outlet.brep'
Error : 'C:\Users\Jacob\Documents\Cube\Cube.geo', line 7 : syntax error (:)
Error : 'C:\Users\Jacob\Documents\Cube\Cube.geo', line 7 : syntax error (;)
Error : 'C:\Users\Jacob\Documents\Cube\Cube.geo', line 7 : syntax error (})
Info : Done reading 'C:\Users\Jacob\Documents\Cube\Cube.geo'
Info : Writing 'C:\Users\Jacob\Documents\Cube\cube.log'...
Instead of that I proved to use BooleanFragments{ Surface{1:6}; Delete; }{ }, but when apply the Surface loop appears 6 more surfaces and the volumen is referenced to them.
<77EC94B488A34710A037994804FB02A5.png>
I also tried to use Geometry.OCCAutoFix = 0, and gets me the output:
Info : Reading 'C:\Users\Jacob\Documents\Cube\Cube.geo'...
Error : Unknown number option 'Geometry.OCCAutoFix'
Info : Reading 'C:\Users\Jacob\Documents\Cube\Inlet.brep'...
Info : Done reading 'C:\Users\Jacob\Documents\Cube\Inlet.brep'
Info : Reading 'C:\Users\Jacob\Documents\Cube\Walls.brep'...
Info : Done reading 'C:\Users\Jacob\Documents\Cube\Walls.brep'
Info : Reading 'C:\Users\Jacob\Documents\Cube\Outlet.brep'...
Info : Done reading 'C:\Users\Jacob\Documents\Cube\Outlet.brep'
Info : Done reading 'C:\Users\Jacob\Documents\Cube\Cube.geo'
Info : Writing 'C:\Users\Jacob\Documents\Cube\Cube2.log'...
I attach the script what I used to do that.
Best Regards
Jacob
Enviado desde Correo<https://go.microsoft.com/fwlink/?LinkId=550986> para Windows 10
De: Christophe Geuzaine<mailto:cgeuzaine at uliege.be>
Enviado: miércoles, 7 de febrero de 2018 17:21
Para: Jacob Abdelfatah Ndioubnane<mailto:jacoban90 at outlook.es>
CC: Christophe Geuzaine<mailto:cgeuzaine at ulg.ac.be>; gmsh at onelab.info<mailto:gmsh at onelab.info>; G. D. McBain<mailto:gdmcbain at protonmail.com>
Asunto: Re: [Gmsh] Boolean Fragments. Créate 3d mesh from surfaces. Surface Loop creates aditional surfaces
On 7 Feb 2018, at 09:07, Jacob Abdelfatah Ndioubnane <jacoban90 at outlook.es<mailto:jacoban90 at outlook.es>> wrote:
Is thiis would be related to the normals of the surfaces?. I noticed that the normals is oriented outward. So i tried to invert the normals but i cannt find a way to do this.
This works fine here:
SetFactory("OpenCASCADE");
Merge "Inlet.brep";
Merge "Walls.brep";
Merge "Outlet.brep";
BooleanFragments{ Surface{:}; Delete; }{ }
Surface Loop(1) = {1, 5, 2, 3, 6, 4};
Volume(1) = {1};
When the orientation of surfaces is inconsistent open cascade will by default automatically reorient the surfaces; unless you set Geomtry.OCCAutoFix = 0.
I attach a figure below.
Best Regards
Jacob<02951EDB824840E597D871724BDD93AD.png>
Enviado desde Correo<https://go.microsoft.com/fwlink/?LinkId=550986> para Windows 10
De: Jacob Abdelfatah Ndioubnane<mailto:jacoban90 at outlook.es>
Enviado: martes, 6 de febrero de 2018 22:36
Para: Christophe Geuzaine<mailto:cgeuzaine at ulg.ac.be>; gmsh at onelab.info<mailto:gmsh at onelab.info>; gmsh-owner at onelab.info<mailto:gmsh-owner at onelab.info>; gmsh-request at ace20.montefiore.ulg.ac.be<mailto:gmsh-request at ace20.montefiore.ulg.ac.be>; G. D. McBain<mailto:gdmcbain at protonmail.com>
Asunto: Boolean Fragments. Créate 3d mesh from surfaces. Surface Loop creates aditional surfaces
Hi gmsh users:
I’m trying to créate a 3d mesh of a cube from a merged 3d surfaces to apply physical groups easily. I applied the booleanFragments operator, and it removes the aditional edges and vértices. However, when I créate a Surface loop, automatically generates aditional surfaces(when i go to tools;vissibility;tree appears 12 surfaces) it creates a , and the volume is referenced to the dupplicate surfaces. Im able to créate both 2d and 3d meses, but when i export into freefem as .mesh or .msh is not loaded correctly. Is there any way to solve this problem. I attach the .geo script below and also the .brep surfaces and the generated .mesh and .msh meses.
// Gmsh project created on Tue Feb 06 20:13:28 2018
SetFactory("OpenCASCADE");
Merge "Inlet.brep";
Merge "Walls.brep";
Merge "Outlet.brep";
s() = Surface "*";
BooleanFragments{ Surface{s(0)}; Delete; }{ Surface{s({0:#s()-1})}; Delete; }//+
//+
Surface Loop(1) = {1, 5, 2, 3, 6, 4};
Volume(1) = {1};
Thank you very much in advance.
Best Regards
Jacob
Enviado desde Correo<https://go.microsoft.com/fwlink/?LinkId=550986> para Windows 10
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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
<Dupplicate surfaces.PNG><Cube.geo>
—
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
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