[vtkusers] Is this vtk precision problem?

[ckchen@CIS]

Hi~
I tried to read a standard vtk file and plot it on the screen. I use the standard procedure to put the following 
data in VTK framework, however, finally there is nothing on the screen,
here is the data file:
*************************************************
# vtk DataFile Version 2.0
# This file is generated by ABCDE.
ASCII

DATASET UNSTRUCTURED_GRID
POINTS 8 double
0.000000000000        0.000000000000        0.000000000000        
7.00000000000e-007    0.000000000000        0.000000000000        
2.00000000000e-006    0.000000000000        0.000000000000        
2.70000000000e-006    0.000000000000        0.000000000000    
0.000000000000        1.50000000000e-006    0.000000000000        
7.00000000000e-007    1.50000000000e-006    0.000000000000        
2.00000000000e-006    1.50000000000e-006    0.000000000000        
2.70000000000e-006    1.50000000000e-006    0.000000000000            
CELLS 6 24
3 0  5 4
3 0 1 5
3 1 6 5
3 1 2 6
3 2 7 6
3 2 3 7
CELL_TYPES 6
5    5    5    5    5    5
POINT_DATA 8
SCALARS var double
LOOKUP_TABLE default
1    
2
3
4
5
6
7
8
***********************************
When I modify the coordinates of each point to larger scale:
0.000000000000          0.000000000000        0.000000000000        
7.00000000000e-005    0.000000000000        0.000000000000        
2.00000000000e-004    0.000000000000        0.000000000000        
2.70000000000e-004    0.000000000000        0.000000000000    
0.000000000000          1.50000000000e-004    0.000000000000        
7.00000000000e-005    1.50000000000e-004   0.000000000000        
2.00000000000e-004    1.50000000000e-004    0.000000000000        
2.70000000000e-004    1.50000000000e-004    0.000000000000    
then I can get the right image on the screen.
Can anyone tell my how to deal with such problem? 

Kavin Chen.
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