[Gmsh] Interpolating mesh values

Jeremy Theler jeremy at seamplex.com
Tue Nov 28 15:24:58 CET 2017

Hi Mayank
I have written that functionality into my own framework called wasora (www.seamplex.com/wasora)
Say you have a .msh file with point-wise defined data as inhttps://bitbucket.org/seamplex/wasora/src/0321d32894d66056e64b2035ac98887b7aa4f29b/examples/tiny.msh?at=master&fileviewer=file-view-default
Then you would have a wasora input file like this onehttps://bitbucket.org/seamplex/wasora/src/0321d32894d66056e64b2035ac98887b7aa4f29b/examples/mesh_function_from_msh.was?at=master&fileviewer=file-view-default
That would leave you a file "tiny-rect.dat" with the data from the msh file interpolated in a rectangular grid.The same should work for 3D meshes.
Let me know if you have any question.--jeremy thelerwww.seamplex.com id="-x-evo-selection-start-marker">

On Mon, 2017-11-27 at 14:41 -0800, Mayank Jog wrote:
> Hello,
> I've started using gmsh recently, and I wonder if there is a functionality to interpolate data. 
> I have a mesh, and a value associated with each element of the mesh (electric potential)*. 
> I want to use this mesh to calculate the value of the electric potential on a uniform cartesian grid specified by points (= (x, y, z) ; known in millimeters; = same unit as in $nodes) 
> I'm guessing some sort of interpolation is needed...how would I go about it? 
> I tried using MATLAB functions to interpolate, but they all use triangulation techniques which work for convex volumes. My volume is non-convex (it has a U-shape)...how would I do the interpolation? Does gmsh have a function to interpolate? 
> Thank you,
> Mayank
> *I have the  original mesh (containing $nodes, $elements, and $elementdata) in .msh format.
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