On 08/11/12 15:04, [email protected] wrote:
Hi, David,
Thank you for the advice.
The method did work for plane surface, but when the model contains topography,
problem comes again. I have to define the curved surface first with GPS data,
and then embed the detecting points in the surface. If I still use the command
Point | Line { expression-list } In Surface { expression };, it doesn't create
a surface with topography.
So the problem is the same as mentioned in my last email: If I have a large
number of control points(like GPS data), is there a simple way to create a
surface with topography using these points?
Hi,
do you know about the "Triangulate" plug-in ?
Plugin(Triangulate) triangulates the points in the view `View', assuming that all the points belong to a surface that
can be projected one-to-one onto a plane.
If `View' < 0, the plugin is run on the current view.
Plugin(Triangulate) creates one new view.
and the corresponding "Tetrahedralize" plug-in ?
Plugin(Tetrahedralize) tetrahedralizes the points in the view `View'.
If `View' < 0, the plugin is run on the current view.
Plugin(Tetrahedralize) creates one new view.
By the way, is there a command or combined technique to embed points in a
volume like the one for surface?
No, it is much more difficult to implement in the 3D meshing algorithms than in
the 2D's
Regards,
Dave
Best Regards,
Jun Yang
-----Original E-mail-----
From: "David Colignon" <[email protected]>
Sent Time: 2012-11-8 17:40:25
To: [email protected]
Cc: [email protected]
Subject: Re: [Gmsh] Question about Gmsh
Hi,
did you see or try this:
https://geuz.org/gmsh/doc/texinfo/gmsh.html#Miscellaneous-mesh-commands
Point | Line { expression-list } In Surface { expression };
Embed the point(s) or line(s) in the given surface. The surface mesh will
conform to the mesh of the point(s) or
lines(s). Note that embedded lines only work with the MeshAdapt 2-D algorithm.
Regards,
Dave
--
David Colignon, Ph.D.
Collaborateur Logistique du F.R.S.-FNRS
CÉCI - Consortium des Équipements de Calcul Intensif
ACE - Applied & Computational Electromagnetics
Université de Liège
Sart-Tilman B28
10, Grande Traverse
4000 Liège - BELGIQUE
Tél: +32 (0)4 366 37 32
WWW: http://www.ceci-hpc.be/
Agenda: http://www.google.com/calendar/embed?src=david.colignon%40gmail.com
On 08/11/12 05:56, [email protected] wrote:
Dear Professor Christophe Geuzaine and Professor Jean-François Remacle,
I'm a graduate student from University of Science and Technology of China. My
major is geophysics and I am now using Gmsh to build models for modeling
geoeletric field.
These models are quite simple. The structure of the model is a cuboid space
with some simple bodies whose properties differ from the cuboid space(We call
them anomalies) inside it. Then when I try to specify large amount of points
that regularly spread on the surface of the model for measuring the eletric
potential, it seems that it's not going to be an easy task. I have to define
all these points, then create line segments between every two adjacent points,
followed by forming line loops to define plane surfaces, and finally put them
into a part of the volume in order to execute the 3D mesh. If I don't do it in
this way, the produced grid will have nothing to do with these deteting points.
However, I need to make sure that these points on the surface are nodes of the
elements.
So is there an easy technique to accomplish this operation? More generally, is
there an elementary classification for stand-alone control points which is
going to be the nodes of the elements when execute the mesh operation, like the
ones I described above? I'm not sure if I miss some important information in
the Gmsh Reference Manual, but till now I can't find a simple way.
The attachment is the .geo file that describes the model I want to build. Only
the points, and lines are defined in the file. If these elementaries have to be
defined manually, thousands of operations are needed.
The Gmsh with GUI is quite easy to operate. Thanks for offering us this
excellent software!
Best Regards,
Jun Yang
University of Scinece and Technology of China
Heifei,China
Email: [email protected]
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