Rectiliner_gridの例．
データはx,y,zの順に入っていく．
<code>
 # vtk DataFile Version 3.0
vtk output
ASCII
DATASET RECTILINEAR_GRID
DIMENSIONS 3 3 3
X_COORDINATES 3 float
0 1 2
Y_COORDINATES 3 float
0 2 4
Z_COORDINATES 3 float
0 3 6
CELL_DATA 8
SCALARS scalars float
LOOKUP_TABLE default
1 2 3 4 5 6 7 8 
POINT_DATA 27
SCALARS scfdalars float
LOOKUP_TABLE default
0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19
20 21 22 23 24 25 26
</code>