# Interpolate onto part of the domain
**URL:** https://discourse.paraview.org/t/interpolate-onto-part-of-the-domain/2853
**Category:** ParaView Support
**Created:** [October 25, 2019, 9:13pm UTC](https://discourse.paraview.org/t/interpolate-onto-part-of-the-domain/2853 "2019-10-25T21:13:07Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@henry2004y](https://discourse.paraview.org/u/henry2004y)
#### Post date: [October 25, 2019, 9:13pm UTC](https://discourse.paraview.org/t/interpolate-onto-part-of-the-domain/2853/1 "2019-10-25T21:13:07Z")
Hi there,
This should be simple, but I don’t know what to do.
My input file is a 3D unstructured vtu. Since I am only interested in part of the domain, I want to interpolate data on a structured mesh for that specific part. I would assume the `box` source + `resample with dataset` filter can do the trick, but later I figured out the box source can only do the interpolation on the surface… What kind of source should I use for this?
Thanks!
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### Author:  [@henry2004y](https://discourse.paraview.org/u/henry2004y)
#### Post date: [October 25, 2019, 9:32pm UTC](https://discourse.paraview.org/t/interpolate-onto-part-of-the-domain/2853/2 "2019-10-25T21:32:08Z")
I later found another filter `ExtractCellsByRegion`, which is a useful way to select part of the domain.
Also, the `PointVolumeInterpolator` might be what I need. There are options of `origins` and `scale`, but they are hard to interpret at first…
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### Author:  [@henry2004y](https://discourse.paraview.org/u/henry2004y)
#### Post date: [October 27, 2019, 6:12pm UTC](https://discourse.paraview.org/t/interpolate-onto-part-of-the-domain/2853/3 "2019-10-27T18:12:14Z")
And later I found that actually `clip` is the easiest way to do this. Needs to be more familiar with Paraview.