--- /dev/null
+# vtk DataFile Version 5.1
+vtk output
+ASCII
+DATASET UNSTRUCTURED_GRID
+POINTS 42 float
+1.3 0.8 0.4 1.4 0.8 0.4 1.4 0.9 0.4
+1.3 0.9 0.4 1.3 0.8 0.5 1.4 0.8 0.5
+1.4 0.9 0.5 1.3 0.9 0.5 1.5 0.8 0.4
+1.5 0.9 0.4 1.5 0.8 0.5 1.5 0.9 0.5
+1.3 0.9 0 1.4 0.9 0 1.4 1 0
+1.3 1 0 1.3 0.9 0.1 1.4 0.9 0.1
+1.4 1 0.1 1.3 1 0.1 1.3 0.9 0.2
+1.4 0.9 0.2 1.4 1 0.2 1.3 1 0.2
+1.3 0.9 0.3 1.4 0.9 0.3 1.4 1 0.3
+1.3 1 0.3 1.4 1 0.4 1.3 1 0.4
+1.4 1 0.5 1.3 1 0.5 1.5 0.9 0
+1.5 1 0 1.5 0.9 0.1 1.5 1 0.1
+1.5 0.9 0.2 1.5 1 0.2 1.5 0.9 0.3
+1.5 1 0.3 1.5 1 0.4 1.5 1 0.5
+
+CELLS 13 96
+OFFSETS vtktypeint64
+0 8 16 24 32 40 48 56 64
+72 80 88 96
+CONNECTIVITY vtktypeint64
+0 1 2 3 4 5 6 7 1
+8 9 2 5 10 11 6 12 13
+14 15 16 17 18 19 16 17 18
+19 20 21 22 23 20 21 22 23
+24 25 26 27 24 25 26 27 3
+2 28 29 3 2 28 29 7 6
+30 31 13 32 33 14 17 34 35
+18 17 34 35 18 21 36 37 22
+21 36 37 22 25 38 39 26 25
+38 39 26 2 9 40 28 2 9
+40 28 6 11 41 30
+CELL_TYPES 12
+12
+12
+12
+12
+12
+12
+12
+12
+12
+12
+12
+12
+
+CELL_DATA 12
+SCALARS mat_id int
+LOOKUP_TABLE default
+2 2 1 1 1 1 2 1 1
+1 1 2
+
+POINT_DATA 42
+SCALARS node_groups int
+LOOKUP_TABLE default
+0 0 0 0 0 0 0 0 0
+0 0 0 1 1 1 1 0 0
+0 0 0 0 0 0 0 0 0
+0 0 0 0 0 1 1 0 0
+0 0 0 0 0 0