[vtkusers] interpolating functions?

[Christopher Intemann]

Hi,
I'm quite new to vtk and wondering about its capabilities.
I have a couple of images, which are crossing in a central axis.
Now I want to cut this area into parallel slices.
I already read the image data and I could store it in a form
like x,y,z,gv.
Now, to obtain the corresponding greyvalue of a new point (xn,yn,zn)
I need some kind of interpolation function, which could calculate
the estimated greyvalue from the greyvalues of the nearest neighbours
e.g.
Is there such a function in vtk?
I do not have the user guide, our library does not have it either, and I
did not find any function reference or user guide online.
Is there a userguide appliciable on the internet, and even more 
interesting, would vtk be appropriate for my problem?
Regards,
  Christopher

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