# Compound part from IGES surfaces is empty

**URL:** <https://prepomax.discourse.group/t/compound-part-from-iges-surfaces-is-empty/156>\
**Category:** Bug Reports\
**Created:** [April 15, 2022, 10:43am UTC](https://prepomax.discourse.group/t/compound-part-from-iges-surfaces-is-empty/156 "2022-04-15T10:43:56Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![heavymetaleng](https://avatars.discourse-cdn.com/v4/letter/h/eb9ed0/32.png) [@heavymetaleng](https://prepomax.discourse.group/u/heavymetaleng)\
**Post date:** [April 15, 2022, 10:43am UTC](https://prepomax.discourse.group/t/compound-part-from-iges-surfaces-is-empty/156/1 "2022-04-15T10:43:56Z")

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Hi all,

I’d like to report the following bug in 1.3.0:  
I tried merging surfaces from an IGES file (exported from Onshape) into a compound part.

 ![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/ff960c49b747f96b683a00d03ee7d9f7c5cb703a.png)

The result is an empty compound part on which I cannot perform any actions. This is what I get when trying to mesh:

![image](https://global.discourse-cdn.com/free1/uploads/prepomax/original/1X/0179a3457a2763bf0df22c45fbbc68cfeba99cbe.png)

Here is the file:  
[surface-test\_2.pmx](https://prepomax.discourse.group/uploads/short-url/amugsbBQfNwNrMx7cJYjWtJMdit.pmx) (1.1 MB)

I hope this is an easy fix. Keep up the good work!  
Wes

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**Author:** ![Matej](https://avatars.discourse-cdn.com/v4/letter/m/a698b9/32.png) [@Matej](https://prepomax.discourse.group/u/Matej)\
**Post date:** [April 15, 2022, 7:15pm UTC](https://prepomax.discourse.group/t/compound-part-from-iges-surfaces-is-empty/156/2 "2022-04-15T19:15:42Z")

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I can confirm the bug. The solution at the moment is to use PrePoMax to export all the geometry parts into the .step format (File-\>Export-\>Step). And then import them again into PrePoMax. The problem seems to be hidden in the netgen.exe mesher, which also takes care of the geometry operations. So it might take a while to fix this behaviour.

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**Author:** ![heavymetaleng](https://avatars.discourse-cdn.com/v4/letter/h/eb9ed0/32.png) [@heavymetaleng](https://prepomax.discourse.group/u/heavymetaleng)\
**Post date:** [April 16, 2022, 12:20pm UTC](https://prepomax.discourse.group/t/compound-part-from-iges-surfaces-is-empty/156/3 "2022-04-16T12:20:15Z")

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Hi Matej,

Thanks for the update. Luckily there is a workaround.

Wes