[Gmsh] Question about gmsh
cgeuzaine at ulg.ac.be
Thu Nov 3 18:47:52 CET 2016
> On 3 Nov 2016, at 02:01, Mayank Jog <mayankjog at gmail.com> wrote:
> Hello Jeremy and Christophe,
> Thanks for the help!
> The data is Current-density magnitude at nodes (attached Fig1.png). I need to recast this onto a uniformly-spaced 3D cartesian grid (nodes are non-uniformly spaced in 3D).
> One hack I tried (please correct me :) ), was to export the .msh file as ascii, then interpolate the data at each element onto the regular cartesian grid. The coordinates of each element I set as the centroid of the nodes comprising the element.
> I'm new to handling mesh data....does that sound like a fair approximation?
> I tried what you suggested in the GUI. I didnt understand the first line (Merge "tutorial/view3.pos";) , but I carried out all the rest steps. I got a new "view", but it only had a couple of voxels. I'm enclosing Fig1.png which shows the data, and Fig2.png which shows what I get when I carried out the step.
You should change the points (X0, Y0, ...) to match your geometry... Interactively, use Tools->Plugins->CutBox.
> On Wed, Nov 2, 2016 at 5:24 AM, Christophe Geuzaine <cgeuzaine at ulg.ac.be> wrote:
> > On 22 Oct 2016, at 04:09, Mayank Jog <mayankjog at gmail.com> wrote:
> > Hello,
> > I have been using "simnibs" software which uses gmsh to calculate electric fields over a 3D mesh/geometry (human head).
> > It outputs a final .msh file, that contains the electric field information, and can be viewed using gmsh.
> > My issue is, I want to convert this file to a list where each line =
> > [coord location, electric field value ] How do I go about doing it?
> > The ultimate goal is to regrid this data onto a regular cartesian grid to do some funky postprocessing (fourier transforms, followed by funky stuff).
> Here's an example:
> Merge "tutorial/view3.pos";
> Save View "points.txt";
> > I tried saving the .msh file as a .txt ** , and then reading it line by line.....I was thinking of replacing each triangular element with its centroid. However, I don't know how to proceed with other elements....please help me out
> > Thank you!
> > Mayank
> > ** "Post processing Generic txt" option in "save as" in gmsh
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> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> Free software: http://gmsh.info | http://getdp.info | http://onelab.info
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Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
Free software: http://gmsh.info | http://getdp.info | http://onelab.info
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