[vtkusers] slice structured grid with polydata

[Justin Weber]

Every hex is converted to 5 tets.  So the "background mesh" starts with:
51x51x51x5 = 663,255 tets

Volume cone / volume of mesh * tets = 1÷3×3.14×.5^2×1÷8×663255=21694

Does seem a little off...
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