# Some Surfaces from STEP File Disappear in Visualization and USDZ Export

**URL:** <https://discourse.shapr3d.com/t/some-surfaces-from-step-file-disappear-in-visualization-and-usdz-export/18720>\
**Category:** Modeling Questions\
**Created:** [April 12, 2022, 2:54am UTC](https://discourse.shapr3d.com/t/some-surfaces-from-step-file-disappear-in-visualization-and-usdz-export/18720 "2022-04-12T02:54:07Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![colonelshaun](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/colonelshaun/32/14659_2.png) [@colonelshaun](https://discourse.shapr3d.com/u/colonelshaun)\
**Post date:** [April 12, 2022, 2:54am UTC](https://discourse.shapr3d.com/t/some-surfaces-from-step-file-disappear-in-visualization-and-usdz-export/18720/1 "2022-04-12T02:54:07Z")

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Hello! I’m a new user, so I can’t upload an example, but I imported a STEP file and want to export a USDZ that I can manipulate in a Video Project. Some of the surfaces were missing in my USDZ exports, and the same surfaces are missing even in the visualization. When in the normal edit interface, I can’t seem to notice any difference between a surface that disappears and one that doesn’t.

I assume this is something simple, but I’ve searched for answers and found none. Any help is appreciated! I can’t upload files, but I put the example on YouTube if it’s helpful:

[![](https://us1.discourse-cdn.com/flex002/uploads/shapr3d/original/3X/0/d/0d4c6059648192f4cf27e997caacee9dac69df45.jpeg "Shapr3D Disappearing Surface Issue") ](https://www.youtube.com/watch?v=NvmpEBVYNA8)

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**Author:** ![Laci\_K](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/laci_k/32/8196_2.png) [@Laci\_K](https://discourse.shapr3d.com/u/Laci_K)\
**Post date:** [April 12, 2022, 5:15am UTC](https://discourse.shapr3d.com/t/some-surfaces-from-step-file-disappear-in-visualization-and-usdz-export/18720/2 "2022-04-12T05:15:17Z")

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Hi,

Could you please contact our support team through [https://support.shapr3d.com/hc/en-us/requests/new](https://support.shapr3d.com/hc/en-us/requests/new) ? The file itself would help a lot, so please attach it to the ticket if possible.

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**Author:** ![KPeter](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.shapr3d.com/kpeter/32/7644_2.png) [@KPeter](https://discourse.shapr3d.com/u/KPeter)\
**Post date:** [April 13, 2022, 12:47pm UTC](https://discourse.shapr3d.com/t/some-surfaces-from-step-file-disappear-in-visualization-and-usdz-export/18720/3 "2022-04-13T12:47:30Z")

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Thanks, we have received the workspace. The model has missing faces on the inside which can be the result of an inaccurate model or some issues with the STEP export flow. As a result of those missing faces, the model cannot be shown properly in the Visualization tool either.

Let me share a short video where I tried to highlight the adjacent faces of the missing ones:

The fastest solution can be re-exporting the file from the software where it was originally made, or repairing it in a surface modeling tool. The latter could be pretty much time-consuming.  
If the original file was made in a software that runs on Parasolid, please give the X\_T format a try as it does not need any conversion during file transfers to Shapr3D.