# mapping scalar data to unstructured mesh

**URL:** https://discourse.paraview.org/t/mapping-scalar-data-to-unstructured-mesh/9789
**Category:** ParaView Support
**Created:** [June 10, 2022, 7:39pm UTC](https://discourse.paraview.org/t/mapping-scalar-data-to-unstructured-mesh/9789 "2022-06-10T19:39:17Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![erdi](https://discourse.paraview.org/user_avatar/discourse.paraview.org/erdi/32/2170_2.png) [@erdi](https://discourse.paraview.org/u/erdi)
#### Post date: [June 10, 2022, 7:39pm UTC](https://discourse.paraview.org/t/mapping-scalar-data-to-unstructured-mesh/9789/1 "2022-06-10T19:39:18Z")

</div>

Hello  
I have a 2D CFD simulation on an unstructured grid with 47472 nodes. I exported x,y coordinates, Point ID(node numbers) to a “.csv” file. So I have 47472x3 data. I added a 4th column to this data that is coming from an external source.

My question is how can I map that 4th column to my original mesh so that I can visualize it. I read many stuff about table to points, table to structured grid filters but no luck. My apologies if my question is repetition, I would really appreciate any help. I attached my csv file in this post.

[vx\_data.csv](https://discourse.paraview.org/uploads/short-url/eDgwp5C657wcPgDp8FJrocwSJvr.csv) (1.8 MB)

---

<div class="post-metadata">

### Author: ![Kenichiro-Yoshimi](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/k/ecc23a/32.png) [@Kenichiro-Yoshimi](https://discourse.paraview.org/u/Kenichiro-Yoshimi)
#### Post date: [June 12, 2022, 11:23pm UTC](https://discourse.paraview.org/t/mapping-scalar-data-to-unstructured-mesh/9789/3 "2022-06-12T23:23:31Z")

</div>

Hi,

For mapping external point data to an unstructured mesh, I typically use the **Point Dataset Interpolator** filter as follows:

1. read in a csv file (vx\_data.csvpost) and store it in ParaView’s table data
2. apply **Table To Point filter** to create point cloud data from the table data
3. load the unstructured mesh used in the CFD simulation into ParaView (\*.vtp format, etc.)
4. finally, apply the **Point Dataset Interpolator** filter  
Input : TableToPoint  
Source: origina\_mesh

---

<div class="post-metadata">

### Author: ![erdi](https://discourse.paraview.org/user_avatar/discourse.paraview.org/erdi/32/2170_2.png) [@erdi](https://discourse.paraview.org/u/erdi)
#### Post date: [June 15, 2022, 3:38am UTC](https://discourse.paraview.org/t/mapping-scalar-data-to-unstructured-mesh/9789/4 "2022-06-15T03:38:01Z")

</div>

Thank you so much @Kenichiro-Yoshimi! This is exactly what I wanted, cheers!