# [Gmsh] Problem in a 3D mesh generation.

Christophe Geuzaine geuzaine at acm.caltech.edu
Fri Aug 1 08:12:50 CEST 2003

```Antonio Manoel Ferreira Frasson wrote:
> When I generate a 3D mesh, the nodes 51,52,53,54,55,56,57,58 missed.
> They does not appear in the topology matrix too. I think that the
> topology is right. But I do not know why this node do not appear in the
> coordinates list and in the topology too.
> The .geo archive and the .msh archive is appended in this mail,
> Thank for all,

Antonio - the node and element numbers in the .msh file format do not
have to (and often don't) form a continuous sequence. See

http://www.geuz.org/gmsh/doc/texinfo/gmsh_10.html#SEC61

Christophe

>
>
> ------------------------------------------------------------------------
>
> lc1=.7;
> Point(1)={-1,-1,-1,lc1};
> Point(2)={-1,-1, 1,lc1};
> Point(3)={-1, 1,-1,lc1};
> Point(4)={-1, 1, 1,lc1};
> Point(5)={ 1,-1,-1,lc1};
> Point(6)={ 1,-1, 1,lc1};
> Point(7)={ 1, 1,-1,lc1};
> Point(8)={ 1, 1, 1,lc1};
> Line(9 )={1,2};
> Line(10)={2,4};
> Line(11)={4,3};
> Line(12)={3,1};
> Line(13)={1,5};
> Line(14)={2,6};
> Line(15)={4,8};
> Line(16)={3,7};
> Line(17)={5,6};
> Line(18)={6,8};
> Line(19)={8,7};
> Line(20)={7,5};
> Line Loop(1) ={9,10,11,12};      Plane Surface(2) ={1};
> Line Loop(3) ={9,14,-17,-13};    Plane Surface(4) ={3};
> Line Loop(5) ={17,18,19,20};     Plane Surface(6) ={5};
> Line Loop(7) ={11,16,-19,-15};   Plane Surface(8) ={7};
> Line Loop(9) ={14,18,-15,-10};   Plane Surface(10)={9};
> Line Loop(11)={13,-20,-16,12};   Plane Surface(12)={11};
> Physical Surface(100)={2,4,6,8,10,12};
> Surface Loop(13)={2,4,6,8,10,12};
> Volume(14)={13};
> Physical Volume(200)={14};
>
>
> ------------------------------------------------------------------------
>
> \$NOD
> 63
> 1 -1 -1 -1
> 2 -1 -1 1
> 3 -1 1 -1
> 4 -1 1 1
> 5 1 -1 -1
> 6 1 -1 1
> 7 1 1 -1
> 8 1 1 1
> 9 -1 -1 -1.387778780781446e-14
> 10 -1 -1.387778780781446e-14 1
> 11 -1 1 1.387778780781446e-14
> 12 -1 1.387778780781446e-14 -1
> 13 -1.387778780781446e-14 -1 -1
> 14 -1.387778780781446e-14 -1 1
> 15 -1.387778780781446e-14 1 1
> 16 -1.387778780781446e-14 1 -1
> 17 1 -1 -1.387778780781446e-14
> 18 1 -1.387778780781446e-14 1
> 19 1 1 1.387778780781446e-14
> 20 1 1.387778780781446e-14 -1
> 21 -1 0.0002605224313024678 0.0001782624998427316
> 22 -1 -0.4998232375548229 -0.4998203056700793
> 23 -1 0.5002806239959249 0.5000563952266407
> 24 -1 -0.499694644807344 0.5001153252864871
> 25 -1 0.50019718994593 -0.4997429564730235
> 26 0.0001581577837787542 -1 -0.0003272567234781462
> 27 0.4999942858012258 -1 0.4998787708226098
> 28 -0.4997457452338422 -1 0.4997893638952256
> 29 -0.4998931924765151 -1 -0.500145218829575
> 30 0.5002772051250094 -1 -0.4999992153329184
> 31 1 0.0002517349097549901 0.0001467617056972634
> 32 1 0.5002320711706016 -0.4999173158666579
> 33 1 0.5002669677716947 0.5001156569504143
> 34 1 -0.4998875118734714 -0.4998872196062727
> 35 1 -0.4998075465150136 0.5002344349974934
> 36 0.0001370869512994823 1 0.0001988124523493676
> 37 -0.499886762051069 1 0.5001513660578182
> 38 -0.4998468524456981 1 -0.5000378505242009
> 39 0.4999810400902673 1 -0.4998481724566354
> 40 0.5001772315384275 1 0.5000798927142721
> 41 0.0001988764503416564 6.541091017457362e-05 1
> 42 -0.499836004163919 0.500174327343137 1
> 43 0.5001685012906728 -0.4999526867941144 1
> 44 -0.4998036167198597 -0.4999064784483089 1
> 45 0.5001540939260374 0.5000587987259613 1
> 46 0.0001681540929762175 0.000119835170166934 -1
> 47 0.5001829603514455 -0.4999034225490214 -1
> 48 -0.4999053441875075 0.5002663991169368 -1
> 49 -0.4998275252050111 -0.4997822027107679 -1
> 50 0.5000734495901755 0.5000964357914779 -1
> 59 -2.821028421095471e-08 -4.443401613968187e-08 2.97764868185773e-10
> 60 -0.4999620083731372 0.0002420907659996798 -0.5000311358085319
> 61 0.50007191647935 0.0001722792384162333 -0.4999158972697985
> 62 -0.4998722670123023 0.0001339227486170596 0.5000840673838562
> 63 -0.4998699183563936 0.5000687007933659 8.052642577832415e-05
> 64 0.0001617450204138436 -0.4998999494938907 0.5000327110155222
> 65 0.0001287283623023268 -0.4998364197823703 -0.5000599197115593
> 66 0.5001817386143517 -0.4998090947471209 0.0001736046225598651
> 67 -0.5000841880658037 -0.4997857995149877 0.0001338576435321219
> 68 0.0003189518097713254 0.4999005636501906 0.4999672374596297
> 69 8.985817133886134e-05 0.5000407121125795 -0.5000703616106584
> 70 0.5000523151918396 0.5000522849423535 -4.761996528410484e-05
> 71 0.500034682758339 -7.827041329071595e-05 0.5001411973175995
> \$ENDNOD
> \$ELM
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> 258 4 200 14 4 19 7 32 39
> 259 4 200 14 4 26 66 59 64
> 260 4 200 14 4 1 49 12 22
> 261 4 200 14 4 3 38 11 25
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> 264 4 200 14 4 48 3 12 25
> 265 4 200 14 4 67 26 59 64
> 266 4 200 14 4 6 18 35 43
> 267 4 200 14 4 34 5 17 30
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> \$ENDELM
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
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--
Christophe A. Geuzaine
Applied and Computational Mathematics, Caltech
geuzaine at acm.caltech.edu - http://geuz.org

```