# Foam file - Reconstructed and Decomposed Case type Error

**URL:** https://discourse.paraview.org/t/foam-file-reconstructed-and-decomposed-case-type-error/10172
**Category:** ParaView Support
**Created:** [August 21, 2022, 5:37pm UTC](https://discourse.paraview.org/t/foam-file-reconstructed-and-decomposed-case-type-error/10172 "2022-08-21T17:37:50Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Graham](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/g/4af34b/32.png) [@Graham](https://discourse.paraview.org/u/Graham)
#### Post date: [August 21, 2022, 5:37pm UTC](https://discourse.paraview.org/t/foam-file-reconstructed-and-decomposed-case-type-error/10172/1 "2022-08-21T17:37:51Z")

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Hi guys,

I have attached two contours. For the first one, I chose the type “Reconstructed Case” whereas the second is “Decomposed Case”. As in the pic, there are these vertical planes formed when I change the case type. Could you please help me remove them?

I need the case type to be decomposed to that I can shift to different time steps  
Thank you

 ![image](https://discourse.paraview.org/uploads/default/original/2X/a/af94f59bd84f66bf4c271c02acf0726f804b1d5f.jpeg)

 ![image](https://discourse.paraview.org/uploads/default/original/2X/6/66b607ce70dfbe9c0e9b36dbebf4024f92ab84c6.jpeg)

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 29, 2022, 4:23am UTC](https://discourse.paraview.org/t/foam-file-reconstructed-and-decomposed-case-type-error/10172/2 "2022-08-29T04:23:50Z")

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Hi @Graham ,

Use the GenerateGhostCells filter.

Best,