# Merging Facets in Imported Geometry

**URL:** <https://molflow-forum.web.cern.ch/t/merging-facets-in-imported-geometry/561>\
**Category:** General discussion\
**Tags:** molflow\
**Created:** [July 17, 2023, 11:53pm UTC](https://molflow-forum.web.cern.ch/t/merging-facets-in-imported-geometry/561 "2023-07-17T23:53:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![kung1234](https://molflow-forum.web.cern.ch/letter_avatar_proxy/v4/letter/k/f14d63/32.png) [@kung1234](https://molflow-forum.web.cern.ch/u/kung1234)\
**Post date:** [July 17, 2023, 11:53pm UTC](https://molflow-forum.web.cern.ch/t/merging-facets-in-imported-geometry/561/1 "2023-07-17T23:53:54Z")

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I want to merge facets on one face of an imported geometry using the collapse command, but this does not work when I select the facets on this particular face. They’re all coplanar and adjacent/touching one another. Potential reasons as to why this is? Thanks!

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**Author:** ![maarton](https://molflow-forum.web.cern.ch/letter_avatar_proxy/v4/letter/m/e5b9ba/32.png) [@maarton](https://molflow-forum.web.cern.ch/u/maarton)\
**Post date:** [July 18, 2023, 2:18pm UTC](https://molflow-forum.web.cern.ch/t/merging-facets-in-imported-geometry/561/2 "2023-07-18T14:18:42Z")

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It is because they are not coplanar, use the Project command as in this tutorial, page 12:

> **[juas\_training\_2023.pdf](https://molflow.web.cern.ch/sites/default/files/juas2023/juas_training_2023.pdf)**
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> 1779.48 KB