Coverting Data File to .tesr

[lkuna24]

Hey all,
I have a cellular automata code I am using for polycrystalline solidification simulations and would like to take my output and attempt to create a mesh from it. The tutorial found here: https://neper.info/tutorials/tesr-mesh/#generating-a-mesh-msh seems to be well written and how I should approach the problem, but I can't seem to find the AlLi.dat (or anything like it). If I knew the formatting of this data file, I could probably format my CA output in a similar manner and attempt to create a mesh. My outputs do include orientation data as well, so at this point it is just a matter of formatting. Is this file, or a sample representative file available for distribution?

[prsdshiva]

This paper mentions the Al data was obtained from here.

Does this lead you to a downloadable .dat file?

[rquey]

It is not the same data.

[rquey]

I will update the tutorial, but the .dat file is just a binary file (or it could be an ascii file) listing the grain ids of the voxels (x varying first). If the volume has X x Y x Z voxels, then there should be the same number of values in the file. The file format (binary or ascii) is to be specified in the tesr file as described in the tutorial.

The .dat file is also the raw data the Neper can produce using -format raw -tesrformat ascii|binary16|.... So, here is how you can get a sample dat/raw/tesr file:

neper -T -n 10 -for raw -tesrformat ascii
neper -T -n 10 -for raw -tesrformat binary16

(I've made a small fix in version 4.2.1-18).

[rquey]

Difficult to say without the .dat file. You can try to generate one with Neper and compare:

neper -T -n 3 -for raw -tesrsize 5:6:7 -o d

You can visualize like this:

neper -V d.tesr -print img

[eugenianietov]

But that would create a .tesr file like the one we mentioned above, right? Not a .dat file, if I understood well. Would the .dat file result from adding '-stattesr cell' to the tessellation command? Thanks a lot!

[rquey]

-for raw will print a .raw (equivalent to your .dat) and a .tesr calling the .raw, so, exactly what you are doing.

$ neper -T -n 3 -for raw -tesrsize 5:6:7 -o d

========================    N   e   p   e   r    =======================
Info   : A software package for polycrystal generation and meshing.
Info   : Version 4.6.1-3
Info   : Built with: gsl|muparser|opengjk|openmp|nlopt|libscotch (full)
Info   : Running on 8 threads.
Info   : <https://neper.info>
Info   : Copyright (C) 2003-2022, and GNU GPL'd, by Romain Quey.
Info   : Loading initialization file `/home/rquey/.neperrc'...
Info   : ---------------------------------------------------------------
Info   : MODULE  -T loaded with arguments:
Info   : [ini file] -tesrformat ascii
Info   : [com line] -n 3 -for raw -tesrsize 5:6:7 -o d
Info   : ---------------------------------------------------------------
Info   : Reading input data...
Info   : Creating domain...
Info   : Creating tessellation...
Info   :   - Setting seeds... 
Info   :   - Generating crystal orientations...
Info   :   - Running tessellation...
Info   : Rasterizing tessellation...
Info   : Writing results...
Info   :     [o] Writing file `d.tesr'...
Info   :     [o] Writing file `d.raw'...
Info   :     [o] Wrote file `d.raw'.
Info   :     [o] Wrote file `d.tesr'.
Info   : Elapsed time: 0.004 secs.
========================================================================

[eugenianietov]

Okay, I finally figured it out. First, the .dat file (in ASCII format) should be a single line, with space-separated integers indicating the grainId of every voxel, with 0 for the empty ones. Also, I found that the **cell argument is mandatory in the .tesr file; otherwise, neper will abort. I provide my test files for a 50x50x50 voxels volume, in case someone finds them useful.

Thanks Mr. Quey, for taking the time!!

Eugenia

test_505050.zip

[Anmol-Bakshi]

Can you please tell how to get ASCII format from EBSD image?