Mesh formats

Mesh formats can be found from: https://gmsh.info/doc/texinfo/gmsh.html#MSH-file-format

Format 4.1:

$MeshFormat
4.1 0 8          MSH4.1, ASCII
$EndMeshFormat
$Nodes
1 6 1 6          1 entity bloc, 6 nodes total, min/max node tags: 1 and 6
2 1 0 6          2D entity (surface) 1, no parametric coordinates, 6 nodes
1                  node tag #1
2                  node tag #2
3                  etc.
4
5
6
0. 0. 0.           node #1 coordinates (0., 0., 0.)
1. 0. 0.           node #2 coordinates (1., 0., 0.)
1. 1. 0.           etc.
0. 1. 0.
2. 0. 0.
2. 1. 0.
$EndNodes
$Elements
1 2 1 2          1 entity bloc, 2 elements total, min/max element tags: 1 and 2
2 1 3 2          2D entity (surface) 1, element type 3 (4-node quad), 2 elements
1 1 2 3 4          quad tag #1, nodes 1 2 3 4
2 2 5 6 3          quad tag #2, nodes 2 5 6 3
$EndElements
$NodeData
1                1 string tag:
"A scalar view"    the name of the view ("A scalar view")
1                1 real tag:
0.0                the time value (0.0)
3                3 integer tags:
0                  the time step (0; time steps always start at 0)
1                  1-component (scalar) field
6                  6 associated nodal values
1 0.0            value associated with node #1 (0.0)
2 0.1            value associated with node #2 (0.1)
3 0.2            etc.
4 0.0
5 0.2
6 0.4
$EndNodeData