# How to find local curvature of an interface in three dimensional simulations using Paraview

**URL:** https://discourse.paraview.org/t/how-to-find-local-curvature-of-an-interface-in-three-dimensional-simulations-using-paraview/12161
**Category:** ParaView Support
**Tags:** vtk
**Created:** [May 26, 2023, 11:57am UTC](https://discourse.paraview.org/t/how-to-find-local-curvature-of-an-interface-in-three-dimensional-simulations-using-paraview/12161 "2023-05-26T11:57:20Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Toshan](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/t/97f17d/32.png) [@Toshan](https://discourse.paraview.org/u/Toshan)
#### Post date: [May 26, 2023, 11:57am UTC](https://discourse.paraview.org/t/how-to-find-local-curvature-of-an-interface-in-three-dimensional-simulations-using-paraview/12161/1 "2023-05-26T11:57:20Z")

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Dear Paraview Users,

I want to find the local curvature of the interface in a 3D numerical simulation. I have dumped the data in “.vtk” format which has all the pressure, velocity and volume fraction field data.

(1) It would be of really great help to me if you could suggest any solution to find the local curvature using some filter/ series of filters at each cell location constituting the interface

(2) How to find the unit normal outward vector of an interface ?

Thank you