[Gmsh] R: BRL-CAD for Geometry?

[Guillaume]

Awesome!

⁣Guillaume​

Le 3 févr. 2017 16:44, à 16:44, Alessandro Vicini <alessandro.vicini at sitael.com> a écrit:
>
>Cool…!!  ☺
>
>
>
>Da: gmsh [mailto:gmsh-bounces at ace20.montefiore.ulg.ac.be] Per conto di
>Christophe Geuzaine
>Inviato: venerdì 3 febbraio 2017 14.49
>A: G. D. McBain
>Cc: gmsh at onelab.info
>Oggetto: Re: [Gmsh] BRL-CAD for Geometry?
>
>
>As a little teaser, just to let you know that I'm coding a direct
>interface to OpenCASCADE CAD creation right in .geo files. This will in
>particular support automatic creation of conform interfaces when you
>fuse solids, in order to handle internal boundaries.
>
>Here's what the scripts will look like (not everything is in the SVN
>trunk yet):
>
>SetFactory("OpenCASCADE");
>
>Mesh.Algorithm = 6;
>Mesh.CharacteristicLengthMin = 0.4;
>Mesh.CharacteristicLengthMax = 0.4;
>
>R = 1.4;
>s = .7;
>t = 1.25;
>
>Block(1) = {-R,-R,-R, R,R,R};
>
>Sphere(2) = {0,0,0,R*t};
>
>BooleanIntersection(3) = { Volume{1}; Delete; }{ Volume{2}; Delete; };
>
>Cylinder(4) = {-2*R,0,0, 2*R,0,0, R*s};
>Cylinder(5) = {0,-2*R,0, 0,2*R,0, R*s};
>Cylinder(6) = {0,0,-2*R, 0,0,2*R, R*s};
>
>BooleanUnion(7) = { Volume{4}; Delete; }{ Volume{5}; Delete; };
>BooleanUnion(8) = { Volume{6}; Delete; }{ Volume{7}; Delete; };
>BooleanSubtraction(9) = { Volume{3}; Delete; }{ Volume{8}; Delete; };
>
>[cid:image001.png at 01D27E36.4943CE80][cid:image002.png at 01D27E36.4943CE80]
>
>
>
>On 2 Feb 2017, at 23:28, G. D. McBain
><gdmcbain at protonmail.com<mailto:gdmcbain at protonmail.com>> wrote:
>
>
>
>Sent from ProtonMail, Swiss-based encrypted email.
>
>
>
>-------- Original Message --------
>Subject: [Gmsh] BRL-CAD for Geometry?
>Local Time: 2 février 2017 4:07 PM
>UTC Time: 2 février 2017 05:07
>From: toddcpierce at gmail.com<mailto:toddcpierce at gmail.com>
>To: gmsh at onelab.info<mailto:gmsh at onelab.info>
>
>Hi All,
>It's me again, wondering how I should go about integrating a
>command-line geometry package into OneLab (or some other chain of
>multi-physics tools).
>As I've mentioned before, although there is no shortage of tools to do
>meshing, finite element analysis or CFD and so forth, there is no
>simple way to build geometries from the command line.
>
>Has anybody ever used this BRL-CAD/Mged command line CAD package?  It
>doesn't look bad, but I do have concerns about it exporting to formats
>that these meshing and physics programs use.
>
>In the past I have used BRL-CAD's mged command-line tool to create
>geometries for subsequent CFD simulations.  I used BRL-CAD's g-stl
>command-line tool to export a triangulation of the bounding surface in
>STL format.  Gmsh can read this in.
>
>More recently though I'm using FreeCAD which can be scripted in Python
>and so run from the command-line.  Besides STL, this also outputs IGES,
>STEP, and BRep, which can contain more information that STL.  Gmsh
>reads all four formats.
>
>OpenSCAD is an excellent accompaniment to FreeCAD too, especially via
>Solid Python.
>
>Often my workflow looks like FreeCAD -> Gmsh -> FreeFem++ -> (Gmsh or
>pandas), with the whole thing run from a single SCons build file.  No
>GUIs, except for preliminary exploratory work.
>
>I haven't looked into OneLab yet.
>
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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
>
>
>
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