[Paraview] Extract Point Data | Nearest Neighbor Location

[Fastl, Thomas]

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<mailto: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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