[vtkusers] get value at x y z (interpolate)

[Hamilton Woods]

Which post am I really replying to?  Perhaps the original one.  I am 
working my way up to attempting to interpolate scalar values at an 
arbitrary x-y-z point.

I wrote a Python script that calls the ParaView engine to interpolate 
scalar values in a 3-D flowfield using a Plot Over Line filter.  This 
could have been done using the Probe Location filter for each point 
along the line segment.

I am now being directed to convert this to C++ (actually they want 
it done in MATLAB, but they may be OK with using the MEX interface 
to call a C++ program), so I thought I would use VTK.  I am just 
learning how to use CMake, so I haven't gotten to the interpolation 
part of the problem yet.  I suspect that I would have tried something 
like a vtkProbeFilter (Graphics folder) for each point along a line 
segment.  The responses that I am seeing to the original post make 
me wonder if this is more challenging than I had thought.

Also, my understanding is that interpolation in VTK is available for 
structured and unstructured grids.

I hope this is not beating a dead horse.  Can anyone shed some 
light on how to do the equivalent of the ParaView Plot Over Line or 
Probe Location filter using VTK directly?

Thanks for your help,
Hamilton Woods

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