[vtkusers] Question about manipulating voxel data

[DORSEY_EDMUND_K at LILLY.COM]

Hi,
    I'm new to this mailing list.  I just started working with VTK and 
python for a summer project which involves subvoxel processing.  The 
problem is this.  I need to read in a vff file (header + 16 bit voxels), 
resample the data, then resave the data.  So far I've read in the file and 
can write it out again as a new file with no changes.  The question is how 
do I split the voxels into new voxels and assign new values.  For example, 
in 2d, each voxel needs to be split into 4 subvoxels and assigned new 
intensities.  I can't just use the built in interpolation methods because 
I need to implement a special algorithm to do the resampling.  I'm also a 
little confused as to how VTK is storing the data.  The orginal vff file 
just lays out the voxels in a grid so as you read them in you know what 
what the location is.  You probably noticed this program doesn't need to 
do any rendering but I want to use VTK because eventually the program will 
be a plugin and if I can orginally write it using vtk it will be  much 
easier later on to merge with the rendering program (already written but 
not by me).  I'm still waiting for my copies of the VTK user guide to 
arrive so mabye that will help once I go through it but can anyone offer 
any advice?  Even some very high level stuff or perhaps point out the 
functions I'd need to use.  Anything would be be helpful as I'm quite 
lost.  Thank you for your time.  ~Edmund Dorsey (confused summer intern)
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