# [Gmsh] Where's Node 1

Joe Koski jkoski11 at comcast.net
Thu Jun 3 23:29:07 CEST 2004

```When I enter the following geometry description on GMSH 1.52.1 under Mac OS
X 10.3.4

lc = 0.015;
Point(1) = {0,0,0,lc};
Point(2) = {1,0,0,lc};
Point(3) = {0,1,0,lc};
Point(4) = {-1,0,0,lc};
Point(5) = {0,-1,0,lc};
Point(6) = {0.9492,0,0,lc};
Point(7) = {0,0.9492,0,lc};
Point(8) = {-0.9492,0,0,lc};
Point(9) = {0,-0.9492,0,lc};
Circle(1) = {2,1,3};
Circle(2) = {3,1,4};
Circle(3) = {4,1,5};
Circle(4) = {5,1,2};
Circle(5) = {6,1,7};
Circle(6) = {7,1,8};
Circle(7) = {8,1,9};
Circle(8) = {9,1,6};
Line Loop(9) = {2,3,4,1};
Line Loop(10) = {5,6,7,8};
Plane Surface(11) = {9,10};
Physical Line(12) = {1};
Physical Line(13) = {4};
Physical Surface(14) = {11};
Recombine Surface {11} = 85;

And then do a 2d mesh of the geometry, I get a successful mesh, but there is
no Node 1 in the .msh file. The node numbering scheme starts with 2. Is this
something that I'm doing? The start of the .msh file looks like this

\$MeshFormat
2 0 8
\$EndMeshFormat
\$Nodes
1849
2 1 0 0
3 0 1 0
4 -1 0 0
5 0 -1 0
6 0.9492 0 0
7 0 0.9492 0
8 -0.9492 0 0
9 0 -0.9492 0
10 0.9998859396174979 0.01510323658138523 0
11 0.9995437844895334 0.03020302780088747 0
...

Joe Koski

```