[vtkusers] Cube representation of data?

[Joel McGraw]

Hello,

I'm new to VTK and trying to create a cube (in C++) composed of "cells" 
or blocks, each of which contains a numeric value that maps to a color. 
    For any point x,y,z in the cube, I only want to see the color that 
represents that point's value.

After looking at the examples and the VTK User's Guide I'm still at a 
loss as to how to start.

Would some kind soul point me down the right path?