This example clarifies the description:

#mesh of a table

MESH "board" dimension 3 ElemType Triangle Nnode 3

# color 127 127 0

Coordinates

# node number coordinate_x coordinate_y coordinate_z

1 -5 3 -3

2 -5 3 0

3 -5 0 0

4 -2 2 0

5 -1.66667 3 0

6 -5 -3 -3

7 -2 -2 0

8 0 0 0

9 -5 -3 0

10 1.66667 3 0

11 -1.66667 -3 0

12 2 2 0

13 2 -2 0

14 1.66667 -3 0

15 5 3 -3

16 5 3 0

17 5 0 0

18 5 -3 -3

19 5 -3 0

end coordinates

#we put both material in the same MESH,

#but they could be separated into two MESH

Elements

# element node_1 node_2 node_3 material_number

5 19 17 13 3

6 3 9 7 3

7 2 3 4 3

8 17 16 12 3

9 12 16 10 3

10 12 10 4 3

11 7 9 11 3

12 7 11 13 3

13 2 4 5 3

14 5 4 10 3

15 19 13 14 3

16 14 13 11 3

17 3 7 4 3

18 17 12 13 3

19 13 12 8 4

20 13 8 7 4

21 7 8 4 4

22 4 8 12 4

end elements

MESH dimension 3 ElemType Line Nnode 2

Coordinates

#no coordinates then they are already in the first MESH

end coordinates

Elements

# element node_1 node_2 material_number

1 9 6 5

2 19 18 5

3 16 15 5

4 2 1 5

end elements

table mesh example

mesh example