# Clip closed surface filter over result of boolean operation

**URL:** https://discourse.paraview.org/t/clip-closed-surface-filter-over-result-of-boolean-operation/15401
**Category:** ParaView Support
**Created:** [September 17, 2024, 3:46pm UTC](https://discourse.paraview.org/t/clip-closed-surface-filter-over-result-of-boolean-operation/15401 "2024-09-17T15:46:22Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![m\_farid](https://discourse.paraview.org/user_avatar/discourse.paraview.org/m_farid/32/12126_2.png) [@m\_farid](https://discourse.paraview.org/u/m_farid)
#### Post date: [September 17, 2024, 3:46pm UTC](https://discourse.paraview.org/t/clip-closed-surface-filter-over-result-of-boolean-operation/15401/1 "2024-09-17T15:46:22Z")

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Hi, in my [previous post](https://discourse.paraview.org/t/how-to-accurately-calculate-cross-section-area-of-stl/15355/7) I noticed that if I use the difference result of the BooleanOperations filter with the Clip Closed Surface filter, sometimes the holes aren’t completely closed. This generally seems to happen if the Clip Closed Surface filter cuts through the difference area and there are two or more areas in the result, as shown in the screenshot. Is this a bug or is there a way to correctly fill the hole?

 ![image](https://discourse.paraview.org/uploads/default/original/2X/c/c632b1252e8acbc77dd68eaa21e609c45ad4a4b0.jpeg)