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### 9.4.1 MSH file format version 1.0 (Legacy)

The MSH file format version 1.0 is Gmsh’s old native mesh file format, now superseded by the format described in MSH ASCII file format. It is defined as follows:

$NODnumber-of-nodesnode-numberx-coordy-coordz-coord… $ENDNOD $ELMnumber-of-elementselm-numberelm-typereg-physreg-elemnumber-of-nodesnode-number-list… $ENDELM

where

`number-of-nodes`is the number of nodes in the mesh.

`node-number`is the number (index) of the

`n`-th node in the mesh;`node-number`must be a postive (non-zero) integer. Note that the`node-number`s do not necessarily have to form a dense nor an ordered sequence.`x-coord``y-coord``z-coord`are the floating point values giving the X, Y and Z coordinates of the

`n`-th node.`number-of-elements`is the number of elements in the mesh.

`elm-number`is the number (index) of the

`n`-th element in the mesh;`elm-number`must be a postive (non-zero) integer. Note that the`elm-number`s do not necessarily have to form a dense nor an ordered sequence.`elm-type`defines the geometrical type of the

`n`-th element:`1`

2-node line.

`2`

3-node triangle.

`3`

4-node quadrangle.

`4`

4-node tetrahedron.

`5`

8-node hexahedron.

`6`

6-node prism.

`7`

5-node pyramid.

`8`

3-node second order line (2 nodes associated with the vertices and 1 with the edge).

`9`

6-node second order triangle (3 nodes associated with the vertices and 3 with the edges).

`10`

9-node second order quadrangle (4 nodes associated with the vertices, 4 with the edges and 1 with the face).

`11`

10-node second order tetrahedron (4 nodes associated with the vertices and 6 with the edges).

`12`

27-node second order hexahedron (8 nodes associated with the vertices, 12 with the edges, 6 with the faces and 1 with the volume).

`13`

18-node second order prism (6 nodes associated with the vertices, 9 with the edges and 3 with the quadrangular faces).

`14`

14-node second order pyramid (5 nodes associated with the vertices, 8 with the edges and 1 with the quadrangular face).

`15`

1-node point.

`16`

8-node second order quadrangle (4 nodes associated with the vertices and 4 with the edges).

`17`

20-node second order hexahedron (8 nodes associated with the vertices and 12 with the edges).

`18`

15-node second order prism (6 nodes associated with the vertices and 9 with the edges).

`19`

13-node second order pyramid (5 nodes associated with the vertices and 8 with the edges).

See below for the ordering of the nodes.

`reg-phys`is the number of the physical entity to which the element belongs;

`reg-phys`must be a postive integer, or zero. If`reg-phys`is equal to zero, the element is considered not to belong to any physical entity.`reg-elem`is the number of the elementary entity to which the element belongs;

`reg-elem`must be a postive (non-zero) integer.`number-of-nodes`is the number of nodes for the

`n`-th element. This is redundant, but kept for backward compatibility.`node-number-list`is the list of the

`number-of-nodes`node numbers of the`n`-th element. The ordering of the nodes is given in Node ordering.

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