converting ijk to point index?

[gvwilson at nevex.com]

Hi.  I've loaded the "combxyz" data set using a vtkPLOT3DReader, and can
use "dims = pl3d.GetOutput().GetDimensions()" to get a 3-vector of the IJK
index dimensions that define the data set.  I now want to access points
using IJK indices, but the 'GetPoint()' routine takes a scalar point ID as
an argument.  How do I convert (i,j,k) into a point ID?  I've tried doing
the usual array-indexing calculations by hand, but that's clearly not the
right answer...
Thanks,
Greg



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