# visualization of normals only in a certain area
**URL:** https://discourse.paraview.org/t/visualization-of-normals-only-in-a-certain-area/5667
**Category:** ParaView Support
**Created:** [October 27, 2020, 7:45pm UTC](https://discourse.paraview.org/t/visualization-of-normals-only-in-a-certain-area/5667 "2020-10-27T19:45:32Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@JanPara](https://discourse.paraview.org/u/JanPara)
#### Post date: [October 27, 2020, 7:45pm UTC](https://discourse.paraview.org/t/visualization-of-normals-only-in-a-certain-area/5667/1 "2020-10-27T19:45:32Z")
Hey there!
Is there any possility that the blue normal vectors in the following state file only are shown in the green area?
I tried to Extract the Selection of cells and then apply the ‘generate surface normals’ filter but the filter is grayed out.[Test.pvsm](https://discourse.paraview.org/uploads/short-url/oPfnfwi6ExtLCiGKOZh3UdgDjsc.pvsm) (690.8 KB)
Thanks in advance!
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### Author:  [@TimJim](https://discourse.paraview.org/u/TimJim)
#### Post date: [October 28, 2020, 7:48am UTC](https://discourse.paraview.org/t/visualization-of-normals-only-in-a-certain-area/5667/2 "2020-10-28T07:48:31Z")
Hi @JanPara just a quick note, the save state file won’t contain any of the meshes and stuff you’re trying to show! So you’ll have to upload those too.
Just in case it helps, I notice that when ‘generate surface normals’ is greyed out for me, I generally need to run ‘Extract Surface’ first - maybe try that?
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### Author:  [@JanPara](https://discourse.paraview.org/u/JanPara)
#### Post date: [October 28, 2020, 3:06pm UTC](https://discourse.paraview.org/t/visualization-of-normals-only-in-a-certain-area/5667/3 "2020-10-28T15:06:38Z")
thanks it works! I didn’t know this Extract Surface Filter
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### Author:  [@TimJim](https://discourse.paraview.org/u/TimJim)
#### Post date: [October 29, 2020, 8:33am UTC](https://discourse.paraview.org/t/visualization-of-normals-only-in-a-certain-area/5667/4 "2020-10-29T08:33:05Z")
Glad it helps! =)