[Paraview] Extract Point Data | Nearest Neighbor Location

[Sebastien Jourdain]

So you are saying that the ExtractSurface on the Unstructured grid won't
produce the same polydata since it will be more refined than your file2? If
that's the case, then maybe just looking for point closer could be the
solution.

On Fri, Aug 3, 2018 at 10:56 AM Fastl, Thomas <thomas.fastl at kcl.ac.uk>
wrote:

> Hey Sebastien,
>
>
> the UNSTRUCTURED_GRID (vtk-file 1) has around 10^8 POINTS, while the
> POYDATA (vtk-file 2) has around 10^6 POINTS, i.e., the POINTS in vtk-file 2
> are a subset of the POINTS in vtk-file 1. Additionally, the POINTS in
> vtk-file 2 have some rounding error so that the location of "corresponding
> points" doesn't matches exactly and a nearest neighbor seems necessary.
>
>
> Best, Thomas
>
> ------------------------------
> *From:* Sebastien Jourdain <sebastien.jourdain at kitware.com>
> *Sent:* Friday, August 3, 2018 17:20
> *To:* Fastl, Thomas
> *Cc:* paraview
> *Subject:* Re: [Paraview] Extract Point Data | Nearest Neighbor Location
>
> If they are truly the "same" why don't you forget your file2 and generate
> a polydata from the file1 as a file3?
>
> On Fri, Aug 3, 2018 at 9:41 AM Fastl, Thomas <thomas.fastl at kcl.ac.uk>
> wrote:
>
> Dear Community,
>
>
> I've got an UNSTRUCTURED_GRID (vtk-file 1) with POINT_DATA and want to
> extract the POINT_DATA at specific POINTS. However, the POINTS are
> defined in POLYDATA (vtk-file 2) and are slightly off by some rounding
> error. Thus, I presume the process should look similar to:
>
>
> 1) Find the nearest neighbors of all POINTS defined in vtk-file 2 in
> vtk-file 1
>
> 2) Transfer/Store the POINT_DATA of the nearest neighbors in vtk-file 1
>
>
> I've been searching the forum for hours, however, couldn't find a solution
> to that problem. I was wondering if there's a simple solution of doing this
> in Paraview? I'd really appreciate your help on this issue, thank you!
>
>
> Best, Thomas
>
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