[vtkusers] precision of points

[Gopalakrishnan, Gowri]

Hi 

I am plotting a well data. My data points are rather close ex: 386761.20
386761.22   6437015.82 6437015.84etc
I am using vtkpoints to assign the points. When I use vtkpolydatawriter to
write the data in a 
file the points are 38761 38761  6.43702e+006. Also when I pass this to tube
filter it fails because it
finds the points to be identical. 
Is there anyway in vtk to specify the precision you want on vtkpoints?. 

I went around this problem by scaling my plot or doing a relative plot. But
I thought it would be good to 
know if there is anyway to specify the exact precision you want on your data
points.

Any help is appreciated. Thank You

Regards
Gowri