[vtkusers] Streamline - Customized interpolation function

[ech]

Dear VTK users,

I have a velocity data as vtkStructuredPoints, and I generate a streamline
using vtkStreamLine.  
>From what I understand, the types of interpolation function (linear,
bilinear, ...) depend on the cell type (line, rectangular, ...) of the data.
So, I want to use my own function, such as taking the nearest point,
instead.  
Would someone please provide me with a pointer on how to do this?

Thanks for your attention!
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