# Extract the isosurface for 3D Scalar; and manipulate each fragments (integrations etc)

**URL:** https://discourse.paraview.org/t/extract-the-isosurface-for-3d-scalar-and-manipulate-each-fragments-integrations-etc/14512
**Category:** ParaView Support
**Created:** [April 29, 2024, 8:44am UTC](https://discourse.paraview.org/t/extract-the-isosurface-for-3d-scalar-and-manipulate-each-fragments-integrations-etc/14512 "2024-04-29T08:44:20Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![rho](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/r/51bf81/32.png) [@rho](https://discourse.paraview.org/u/rho)
#### Post date: [April 29, 2024, 8:44am UTC](https://discourse.paraview.org/t/extract-the-isosurface-for-3d-scalar-and-manipulate-each-fragments-integrations-etc/14512/1 "2024-04-29T08:44:20Z")

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Dear all,

I have a 3D scalar in vtk format:  
[Collid\_0051.vtk](https://discourse.paraview.org/uploads/short-url/qCEB66fKPNC44hSENhky5GJ6vLG.vtk) (1.1 MB)

I’d like to extract the isosurface of this 3D density field and performe integration over the  
volume surrounding each isosurface (isosurfaces are disconnected).

Basically, I need to (1) extract the isosurface of a 3D scalar field, (2) analyse the connectivity  
of the surfaces, and (3) calculate information for each subfragment.

Thanks a lot,

-Y