# strange looking mesh - like one mesh overlay on top of another

**URL:** https://discourse.paraview.org/t/strange-looking-mesh-like-one-mesh-overlay-on-top-of-another/11498
**Category:** ParaView Support
**Created:** [February 26, 2023, 1:23am UTC](https://discourse.paraview.org/t/strange-looking-mesh-like-one-mesh-overlay-on-top-of-another/11498 "2023-02-26T01:23:14Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![quarkz](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/q/ed8c4c/32.png) [@quarkz](https://discourse.paraview.org/u/quarkz)
#### Post date: [February 26, 2023, 1:23am UTC](https://discourse.paraview.org/t/strange-looking-mesh-like-one-mesh-overlay-on-top-of-another/11498/1 "2023-02-26T01:23:14Z")

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Hi, I’m using snappyhexMesh to create a 2D (one layer) mesh with an airfoil inside. The mesh looks strange, like one mesh overlay on top of another.  
It looks ok when loaded, but once I zoom in and out, the strange thing happens. I have attached the mesh. Is it a bug?  
 ![paraview mesh bug 1](https://discourse.paraview.org/uploads/default/original/2X/5/5c33eb549e148b2aa76e1a6cc47bd0efab1bacfd.png)  
 ![paraview mesh bug 2](https://discourse.paraview.org/uploads/default/original/2X/8/851ed1f1a6717a8eaf45d378e6d85371c5e7607c.png)

Thanks!

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<div class="post-metadata">

### Author: ![quarkz](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/q/ed8c4c/32.png) [@quarkz](https://discourse.paraview.org/u/quarkz)
#### Post date: [February 27, 2023, 2:40am UTC](https://discourse.paraview.org/t/strange-looking-mesh-like-one-mesh-overlay-on-top-of-another/11498/2 "2023-02-27T02:40:00Z")

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Hi, I found the reason. It’s because I have another polyMesh dir inside the polyMesh dir. Once I deleted it, the problem is gone. So somehow paraview was reading maybe both meshes.