# Alembic Import multiple mesh crash

**URL:** <https://forums.unrealengine.com/t/alembic-import-multiple-mesh-crash/368975>\
**Category:** Character & Animation\
**Tags:** unreal-engine, crash, bug-report, UE4, question\
**Created:** [September 1, 2016, 7:59am UTC](https://forums.unrealengine.com/t/alembic-import-multiple-mesh-crash/368975 "2016-09-01T07:59:59Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Richard\_Culver](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Richard\_Culver](https://forums.unrealengine.com/u/Richard_Culver)\
**Post date:** [September 1, 2016, 7:59am UTC](https://forums.unrealengine.com/t/alembic-import-multiple-mesh-crash/368975/1 "2016-09-01T07:59:59Z")

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When I try and import an Alembic file that has multiple meshes, UE crashes. When I only select one. It imports fine.

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**Author:** ![Tim\_Hobson](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Tim\_Hobson](https://forums.unrealengine.com/u/Tim_Hobson)\
**Post date:** [September 1, 2016, 11:49am UTC](https://forums.unrealengine.com/t/alembic-import-multiple-mesh-crash/368975/2 "2016-09-01T11:49:33Z")

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Hey Richard,

\*sorry, you’ll get another email here. I accidentally posted the answer to another question on yours! That’s what I get for having multiple tabs opened!

Anyway, do you have a test asset that you can upload? I created a couple of scaling shapes with their own animations but these appear to import fine for me in 4.13 Preview 3.

I also imported these with each available Alembic option for Static, Geometry Cache, and Skeletal without the crash.

Thank you!

Tim

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**Author:** ![Richard\_Culver](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Richard\_Culver](https://forums.unrealengine.com/u/Richard_Culver)\
**Post date:** [September 1, 2016, 12:22pm UTC](https://forums.unrealengine.com/t/alembic-import-multiple-mesh-crash/368975/3 "2016-09-01T12:22:21Z")

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Did the file you tested have multiple meshes?

Here is the test file. Opens up fine in other apps.

[http://a360.co/2cbvj69](http://a360.co/2cbvj69)

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**Author:** ![Richard\_Culver](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Richard\_Culver](https://forums.unrealengine.com/u/Richard_Culver)\
**Post date:** [September 1, 2016, 12:23pm UTC](https://forums.unrealengine.com/t/alembic-import-multiple-mesh-crash/368975/4 "2016-09-01T12:23:21Z")

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Did the file you tested have multiple meshes?

Here is the test file. Opens up fine in other apps.

[http://a360.co/2cbvj69](http://a360.co/2cbvj69)

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**Author:** ![Tim\_Hobson](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Tim\_Hobson](https://forums.unrealengine.com/u/Tim_Hobson)\
**Post date:** [September 1, 2016, 1:56pm UTC](https://forums.unrealengine.com/t/alembic-import-multiple-mesh-crash/368975/5 "2016-09-01T13:56:28Z")

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Thanks for the test asset. I get the crash after a few moments with yours but not with my simple shapes asset.

I’ve submitted a ticket for this that can be tracked here: [Unreal Engine Issues and Bug Tracker (UE-35451)](https://issues.unrealengine.com/issue/UE-35451)

Thank you!

Tim

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**Author:** ![Richard\_Culver](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Richard\_Culver](https://forums.unrealengine.com/u/Richard_Culver)\
**Post date:** [September 1, 2016, 1:59pm UTC](https://forums.unrealengine.com/t/alembic-import-multiple-mesh-crash/368975/6 "2016-09-01T13:59:58Z")

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Thanks Tim. Yeah in general I find simple tests are not enough. Things like this really need full-on production testing with characters.

Hope this and the other issues I have found get taken care of.

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**Author:** ![EGJurre](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@EGJurre](https://forums.unrealengine.com/u/EGJurre)\
**Post date:** [September 8, 2016, 1:59pm UTC](https://forums.unrealengine.com/t/alembic-import-multiple-mesh-crash/368975/7 "2016-09-08T13:59:28Z")

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I’ve found that within Hooker\_Eye\_LenseShape and Hooker\_Eye\_BallShape there are faces made out of \> 4 vertices, we sadly do not support triangulating N-gons. This causes an issue further down the road which I will address, but for now you can work around this by triangulating your Ngons.

Cheers,

Jurre