# Show isosurface from data in a CSV file

**URL:** https://discourse.paraview.org/t/show-isosurface-from-data-in-a-csv-file/7943
**Category:** ParaView Support
**Created:** [September 5, 2021, 2:52am UTC](https://discourse.paraview.org/t/show-isosurface-from-data-in-a-csv-file/7943 "2021-09-05T02:52:12Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![JeffB](https://discourse.paraview.org/user_avatar/discourse.paraview.org/jeffb/32/7520_2.png) [@JeffB](https://discourse.paraview.org/u/JeffB)
#### Post date: [September 5, 2021, 2:52am UTC](https://discourse.paraview.org/t/show-isosurface-from-data-in-a-csv-file/7943/1 "2021-09-05T02:52:12Z")

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I have a csv file. The first three columns are x,y,z coordinates and the fourth column is a density value between 0.0 and 1.0. I just want to plot an isosurface through these density values using a prescribed critical density, say 0.5.

I know this should be simple and someone probably has a tutorial on that, but I have been reading and reading different websites and paraview support and I can’t find it. I can read the csv file and display the table as points filter, etc. I also know that isosurfaces are obtained using Filter-\>Contour, but the contour filter is disabled when I try to select it.

I’m truly sorry to waste anyone’s time on a simple question, but I’ve been reading tutorials for hours and not finding anything. Help is truly appreciated!

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [September 6, 2021, 6:32am UTC](https://discourse.paraview.org/t/show-isosurface-from-data-in-a-csv-file/7943/2 "2021-09-06T06:32:41Z")

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- File → Open → file.csv, Apply
- TableToStructuredGrid, Apply
- Contour, Apply

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### Author: ![Potter](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/p/3d9bf3/32.png) [@Potter](https://discourse.paraview.org/u/Potter)
#### Post date: [July 10, 2023, 9:15am UTC](https://discourse.paraview.org/t/show-isosurface-from-data-in-a-csv-file/7943/3 "2023-07-10T09:15:21Z")

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So the CSV data has to be a structured grid? What if it isnt?

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [July 10, 2023, 9:35am UTC](https://discourse.paraview.org/t/show-isosurface-from-data-in-a-csv-file/7943/4 "2023-07-10T09:35:34Z")

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- File → Open → file.csv, Apply
- TableToPointCloud, Apply
- Delaunay3D, Apply
- Contour, Apply