Data writer double precision problem
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
The vtk data writers always use the default precision of 6, even when writing out 64 bit data values. I would suggest bumping up the precision to 10 or 11 when writing out 64 bit data values. Otherwise, I don't think there's any real point to having 64 bit data arrays. It think that the fix is as simple as:
this->Stream << setprecision(11) << value;
where value comes from a 64 bit data array like vtkLongArray or vtkDoubleArray.