[vtkusers] Find grid from point cloud

[David Doria]

>
> PCA will allow you to get the plane onto the XY plane, but I don't
> think you'd be able to align the X and Y axis with the main directions
> of your grid. Maybe I'm wrong?
>
> If you figure out how to use it (even the first part), maybe you can
> post a small example:
> http://vtk.org/Wiki/VTK/Examples/vtkPCAAnalysisFilter
>
> Thanks,
>
> David
>

You didn't happen to figure this out did you? It seems like a very
reasonable thing to be able to do, but the filter doesn't seem to have the
output we are expecting?

Thanks,

David
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