3D meshing fails ' failed_polys' file generated.

[18nanma]

2D Meshing goes through, but 3D meshing fails ' failed_polys' file generated.

gmsh installed correctly, neper tesselation generation is also fine.

neper -M n10-id1.tess

======================== N e p e r ======================= Info : A software package for polycrystal generation and meshing. Info : Version 4.9.0 Info : Built with: gsl|muparser|opengjk|openmp|nlopt|libscotch (full) Info : Running on 1 threads. Info : https://neper.info/ Info : Copyright (C) 2003-2022, and GNU GPL'd, by Romain Quey. Info : Ignoring initialization file. Info : --------------------------------------------------------------- Info : MODULE -M loaded with arguments: Info : [ini file] (none) Info : [com line] n100-id1.tess -mesh3dclreps 1 Info : --------------------------------------------------------------- Info : Reading input data... Info : - Reading arguments... Info : Loading input data... Info : - Loading tessellation... Info : [i] Parsing file n100-id1.tess'... Info : [i] Parsed filen100-id1.tess'. Info : Meshing... Info : - Preparing... (cl = 0.1077) 100% Info : - 0D meshing... 100% Info : - 1D meshing... 100% Info : - 2D meshing... 100% (0.045|0.64/96%| 3%| 1%) Info : - Fixing 2D-mesh pinches... Info : - 3D meshing... Info : [o] Writing file failed_polys'... Info : [o] Wrote filefailed_polys'. Error : Meshing failed

[rquey]

You forgot this part:

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[18nanma]

Thank you so much for the quick response and for creating this awesome software. so the msh works for -eltype hex and quad but not for tri or tet

$ neper -T -n 10 -dim 3
$ neper -V n10-id1.tess -datacellcol id -print Image_1
$ neper -M n10-id1.tess -elttype hex

========================    N   e   p   e   r    =======================
Info   : A software package for polycrystal generation and meshing.
Info   : Version 4.9.0
Info   : Built with: gsl|muparser|opengjk|openmp|nlopt|libscotch (full)
Info   : Running on 1 threads.
Info   : <https://neper.info/>
Info   : Copyright (C) 2003-2022, and GNU GPL'd, by Romain Quey.
Info   : No initialization file found (`/root/.neperrc').
Info   : ---------------------------------------------------------------
Info   : MODULE  -M loaded with arguments:
Info   : [ini file] (none)
Info   : [com line] n10-id1.tess -elttype hex
Info   : ---------------------------------------------------------------
Info   : Reading input data...
Info   :   - Reading arguments...
Info   : Loading input data...
Info   :   - Loading tessellation...
Info   :     [i] Parsing file `n10-id1.tess'...
Info   :     [i] Parsed file `n10-id1.tess'.
Info   : Meshing...
Info   :   - Preparing... (cl = 0.09999) 100%
Info   :   - 3D meshing... 100%
Info   :   - Switching mesh to order 2...
Info   : Searching nsets and fasets...
Info   : Writing mesh results...
Info   :   - Preparing mesh...
Info   :   - Mesh properties:
Info   :     > Node number:     4961
Info   :     > Elt  number:     1000
Info   :     > Mesh volume:    1.000
Info   :   - Writing mesh...
Info   :     [o] Writing file `n10-id1.msh'...
Info   :     [o] Wrote file `n10-id1.msh'.
Info   : Elapsed time: 0.125 secs.
========================================================================**

$ neper -M n10-id1.tess -rcl 0.5  -order 2 -elttype tet

========================    N   e   p   e   r    =======================
Info   : A software package for polycrystal generation and meshing.
Info   : Version 4.9.0
Info   : Built with: gsl|muparser|opengjk|openmp|nlopt|libscotch (full)
Info   : Running on 1 threads.
Info   : <https://neper.info/>
Info   : Copyright (C) 2003-2022, and GNU GPL'd, by Romain Quey.
Info   : No initialization file found (`/root/.neperrc').
Info   : ---------------------------------------------------------------
Info   : MODULE  -M loaded with arguments:
Info   : [ini file] (none)
Info   : [com line] n10-id1.tess -rcl 0.5 -order 2 -elttype tet
Info   : ---------------------------------------------------------------
Info   : Reading input data...
Info   :   - Reading arguments...
Info   : Loading input data...
Info   :   - Loading tessellation...
Info   :     [i] Parsing file `n10-id1.tess'...
Info   :     [i] Parsed file `n10-id1.tess'.
Info   : Meshing...
Info   :   - Preparing... (cl = 0.116) 100%
Info   :   - 0D meshing... 100%
Info   :   - 1D meshing... 100%
Info   :   - 2D meshing... 100% (0.3|0.86/85%|10%| 5%)
Info   :   - Fixing 2D-mesh pinches...
Info   :   - 3D meshing... Info   :     [o] Writing file `failed_polys'...
Info   :     [o] Wrote file `failed_polys'.
Error  : Meshing failed

[rquey]

It must be a problem with your Gmsh installation. What version are you using, and how did you install it?

[18nanma]

very interesting, I followed an earlier post of using older gmsh command and it works.(newer one doesn't) !neper -T -n 100 -id 1 -format geo !gmsh -format msh2 -3 n100-id1.geo

the gmsh version i currently use is 4.8.4

[rquey]

Your Gmsh installation must be broken somehow. Everything works here with Gmsh 4.8.4.

[18nanma]

I use Colab, that might be the issue. Thanks for your promt response and contribution