# vtk DataFile Version 2.0
cell attributes
ASCII

DATASET UNSTRUCTURED_GRID
POINTS 18 float
 0.5 0.5 0.5
 1.5 0.5 0.5
 0.5 1.5 0.5
 0.5 0.5 1.5
 1.5 0.5 1.5
 0.5 1.5 1.5
 1.1 1.1 1
 2.1 1.1 1
 2.1 2.1 1
 1.1 2.1 1
 1.1 1.1 2
 2.1 1.1 2
 2.1 2.1 2
 1.1 2.1 2
 2.2 2.2 2
 3.2 2.2 2
 2.2 3.2 2
 2.2 2.2 3

CELLS 3 27
 8 0 1 2 2 3 4 5 5
 8 6 7 8 9 10 11 12 13
 8 14 15 16 17 17 17 17 17

CELL_TYPES 3
 12
 12
 12

CELL_DATA 3
FIELD attributes 3
group 1 3 int
 1
 2
 1
material 1 3 int
 100
 200
 300
group_and_material 2 3 int
 1 100
 2 200
 1 300