Smesh file format

Smesh File Format

.smesh is a file format which describes the mesh topology. It is similar to the .hm file generated by hypermesh software in engineering. Smesh is constructed by two components, vertices and elements.

Smesh Vertices

*VERTICES
7000 3
1 -2.55419445038 1.81299638748 0.377781808376
2 -2.55419445038 1.81299638748 0.529374539852
3 -2.55419445038 1.81299638748 0.680967271328
...
7000 -2.4026017189 1.20662546158 0.377781808376

• first line is *VERTICES.
• second line has two numbers, amount of vertices N and dimension of vertex D.
• then followed by N lines, each line contains the information of a vertex which are vertex-index, x1, x2, ..., xD. x1, x2, ..., xD are the position of the vertex.

Smesh Elements

*ELEMENTS
HEX 
550 8
1 1 62 73 6 2 63 74 7
2 2 63 74 7 3 64 75 8
3 3 64 75 8 4 65 76 9
...
550 64 202 214 75 65 203 215 76

LINE 
4 2
1 5 8
2 3 4
...
4 99 34

• first line is *ELEMENTS
• then followed by several blocks of different element types. Now we only support LINE,TRIANGLE,QUAD,TET,HEX. Each block has following format
  • first line is element type, like LINE.
  • second line is amount of elements M and amount of vertices in an element E, like 4 2.
  • then followed by M lines, each line contains the information of an element which are element-index, v1, v2, ..., vE. v1, v2, ..., vE are vertex indexes in the element.

Topology Convention

For elements like QUAD,HEX, there are some convention about the topology of vertices in an element.

QUAD

/* QUAD
 3-----2 
 |     |
 |     |
 0-----1
*/

HEX

/*  HEX
   7-----6
  /|    /|
 4-----5 |
 | 3---|-2
 |/    |/
 0-----1
*/