# extract interface between water and air

**URL:** https://discourse.paraview.org/t/extract-interface-between-water-and-air/15980
**Category:** ParaView Support
**Created:** [January 14, 2025, 12:59pm UTC](https://discourse.paraview.org/t/extract-interface-between-water-and-air/15980 "2025-01-14T12:59:06Z")
**Posts on this page:** 1
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### Author: ![Kenneth\_Moreland](https://discourse.paraview.org/user_avatar/discourse.paraview.org/kenneth_moreland/32/15033_2.png) [@Kenneth\_Moreland](https://discourse.paraview.org/u/Kenneth_Moreland)
#### Post date: [January 14, 2025, 9:10pm UTC](https://discourse.paraview.org/t/extract-interface-between-water-and-air/15980/3 "2025-01-14T21:10:03Z")

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You could try running the `Connectivity` filter on the output of the `Contour` filter. `Connectivity` will divide your data into groups of cells that are mutually touching and give a unique id to each connected group. You can then identify which id is assigned to the surface part of the contour and use the `Threshold` filter to extract that part.

That should work as long as no bubble is touching. If a bubble touches, then you’ll get the geometry for that bubble as well.

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