[Gmsh] Reproduceable gmsh 3D meshing error...

David Colignon David.Colignon at univ.u-3mrs.fr
Mon Dec 16 09:25:07 CET 2002

```Hi,

if in Tools -> Options -> Mesh -> 2D you choose "New isotropic algorithm"
or "Anisotropic algorithm", it works fine.

Dave

A 22:23 15/12/2002 -0500, Toshiro K. Ohsumi a écrit :
>Hello,
>
>   I have a reproducable 3D mesh gmsh error.  Attached below is the model.
>With lc = 0.25, with cross.msh (attached below), the error is attached below.
>With lc = 0.375, no error messages occur.  I am using gmsh 1.36.0.  Many
>thanks,
>
>
>		- Toshiro K. Ohsumi
>
>
>---------------------------- cross.msh -------------------------------------
>
>lc = 0.25;
>Point(1) = {-0.35,-17.5,0.1,lc};
>Point(2) = {0.35,-17.5,0.1,lc};
>Point(3) = {0.35,-0.35,0.1,lc};
>Point(4) = {17.5,-0.35,0.1,lc};
>Point(5) = {17.5,0.35,0.1,lc};
>Point(6) = {0.35,0.35,0.1,lc};
>Point(7) = {0.35,17.5,0.1,lc};
>Point(8) = {-0.35,17.5,0.1,lc};
>Point(9) = {-0.35,0.35,0.1,lc};
>Point(10) = {-17.5,0.35,0.1,lc};
>Point(11) = {-17.5,-0.35,0.1,lc};
>Point(12) = {-0.35,-0.35,0.1,lc};
>Point(13) = {-0.35,-17.5,-0.1,lc};
>Point(14) = {0.35,-17.5,-0.1,lc};
>Point(15) = {0.35,-0.35,-0.1,lc};
>Point(16) = {17.5,-0.35,-0.1,lc};
>Point(17) = {17.5,0.35,-0.1,lc};
>Point(18) = {0.35,0.35,-0.1,lc};
>Point(19) = {0.35,17.5,-0.1,lc};
>Point(20) = {-0.35,17.5,-0.1,lc};
>Point(21) = {-0.35,0.35,-0.1,lc};
>Point(22) = {-17.5,0.35,-0.1,lc};
>Point(23) = {-17.5,-0.35,-0.1,lc};
>Point(24) = {-0.35,-0.35,-0.1,lc};
>Line(30) = {1,2};
>Line(31) = {2,3};
>Line(32) = {3,4};
>Line(33) = {4,5};
>Line(34) = {5,6};
>Line(35) = {6,7};
>Line(36) = {7,8};
>Line(37) = {8,9};
>Line(38) = {9,10};
>Line(39) = {10,11};
>Line(40) = {11,12};
>Line(41) = {12,1};
>Line(42) = {13,14};
>Line(43) = {14,15};
>Line(44) = {15,16};
>Line(45) = {16,17};
>Line(46) = {17,18};
>Line(47) = {18,19};
>Line(48) = {19,20};
>Line(49) = {20,21};
>Line(50) = {21,22};
>Line(51) = {22,23};
>Line(52) = {23,24};
>Line(53) = {24,13};
>Line(54) = {1,13};
>Line(55) = {2,14};
>Line(56) = {3,15};
>Line(57) = {4,16};
>Line(58) = {5,17};
>Line(59) = {6,18};
>Line(60) = {7,19};
>Line(61) = {8,20};
>Line(62) = {9,21};
>Line(63) = {10,22};
>Line(64) = {11,23};
>Line(65) = {12,24};
>Line Loop(70) = {30,31,32,33,34,35,36,37,38,39,40,41};
>Plane Surface(71) = {70};
>Line Loop(72) = {42,43,44,45,46,47,48,49,50,51,52,53};
>Plane Surface(73) = {72};
>Line Loop(74) = {30,55,-42,-54};
>Plane Surface(75) = {74};
>Line Loop(76) = {55,43,-56,-31};
>Plane Surface(77) = {76};
>Line Loop(78) = {32,57,-44,-56};
>Plane Surface(79) = {78};
>Line Loop(80) = {57,45,-58,-33};
>Plane Surface(81) = {80};
>Line Loop(82) = {58,46,-59,-34};
>Plane Surface(83) = {82};
>Line Loop(84) = {59,47,-60,-35};
>Plane Surface(85) = {84};
>Line Loop(86) = {60,48,-61,-36};
>Plane Surface(87) = {86};
>Line Loop(88) = {62,-49,-61,37};
>Plane Surface(89) = {88};
>Line Loop(90) = {-38,62,50,-63};
>Plane Surface(91) = {90};
>Line Loop(92) = {63,51,-64,-39};
>Plane Surface(93) = {92};
>Line Loop(94) = {65,-52,-64,40};
>Plane Surface(95) = {94};
>Line Loop(96) = {54,-53,-65,41};
>Plane Surface(97) = {96};
>Surface Loop(100) = {71,73,75,77,79,81,83,85,87,89,91,93,95,97};
>Volume(101) = {100};
>
>----------------------------- .gmsh-errors ---------------------------------
>
>Gmsh 1.36.0
>-------------------------------------------------------
>Build OS       : CYGWIN_ME-4.90 1.3.5(0.47/3/2)
>Build date     : Thu Nov 21 02:10:15  2002
>Build host     : ELAP74
>Packager       : geuzaine
>Home directory : /cygdrive/c/DOCUME~1/TOSHIR~1.OHS/LOCALS~1/Temp/
>Launch date    : Sun Dec 15 22:16:45 2002
>Command line   : /cygdrive/c/Program Files/Gmsh/gmsh
>-------------------------------------------------------
>Geometry
>Mesh
>Mesh 1D...
>Meshing Curve 30
>Meshing Curve 31
>Meshing Curve 32
>Meshing Curve 33
>Meshing Curve 34
>Meshing Curve 35
>Meshing Curve 36
>Meshing Curve 37
>Meshing Curve 38
>Meshing Curve 39
>Meshing Curve 40
>Meshing Curve 41
>Meshing Curve 42
>Meshing Curve 43
>Meshing Curve 44
>Meshing Curve 45
>Meshing Curve 46
>Meshing Curve 47
>Meshing Curve 48
>Meshing Curve 49
>Meshing Curve 50
>Meshing Curve 51
>Meshing Curve 52
>Meshing Curve 53
>Meshing Curve 54
>Meshing Curve 55
>Meshing Curve 56
>Meshing Curve 57
>Meshing Curve 58
>Meshing Curve 59
>Meshing Curve 60
>Meshing Curve 61
>Meshing Curve 62
>Meshing Curve 63
>Meshing Curve 64
>Meshing Curve 65
>Mesh 1D complete (0.01 s)
>Mesh 2D...
>Meshing Surface 71
>Meshing Surface 73
>Meshing Surface 75
>Meshing Surface 77
>Meshing Surface 79
>Meshing Surface 81
>Meshing Surface 83
>Meshing Surface 85
>Meshing Surface 87
>Meshing Surface 89
>Meshing Surface 91
>Meshing Surface 93
>Meshing Surface 95
>Meshing Surface 97
>Mesh 2D complete (0.601 s)
>Mesh 3D...
>Mesh 3D... (initial)
>Nod=103/2067 Elm=518
>Vol=672.28 (102 0 1)
>Nod=206/2067 Elm=1026
>Vol=672.28 (205 0 1)
>Nod=309/2067 Elm=1534
>Vol=672.28 (308 0 1)
>Nod=412/2067 Elm=2045
>Vol=672.28 (411 0 1)
>Nod=515/2067 Elm=2656
>Vol=672.28 (514 0 1)
>Nod=618/2067 Elm=3154
>Vol=672.28 (617 0 1)
>Nod=721/2067 Elm=3771
>Vol=672.28 (720 0 1)
>Nod=824/2067 Elm=4496
>Vol=672.28 (797 24 3)
>Nod=927/2067 Elm=4981
>Vol=672.28 (809 110 8)
>Nod=1030/2067 Elm=5617
>Vol=672.28 (823 194 13)
>Nod=1133/2067 Elm=6202
>Vol=672.28 (832 283 18)
>Fatal Error : Segmentation violation (invalid memory reference)
>            : ------------------------------------------------------
>            : You have discovered a bug in Gmsh! You may report it
>            : by e-mail (together with any helpful data permitting to
>            : reproduce it) to <gmsh at geuz.org>
>
>
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>
>

Dave

```