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Hierarchical instanced static mesh component crashing after upgrade to 4.12

After project was upgraded to 4.12 opening a blueprint that contains Hierarchical Instanced Static Mesh component will result in a crash. From the log I this is the important part:

 Assertion failed: InComponent->InstanceReorderTable.Num() == InComponent->PerInstanceSMData.Num() [File:D:\Build\++UE4+Release-4.12+Compile\Sync\Engine\Source\Runtime\Engine\Private\HierarchicalInstancedStaticMesh.cpp] [Line: 756] 

Removing the component before upgrade will fix the problem. I re-added the component and re-set the nodes exactly like they were and everything works now.

Product Version: UE 4.12
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asked Jun 07 '16 at 07:51 AM in Bug Reports

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Jaatuli
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Hi, thanks for the bug report report. I've entered ticket UE-31702 to fix the issue. Is the content small enough to upload? An easy reproduction case would be very helpful if you have one.

Thanks Jack

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answered Jun 07 '16 at 09:20 AM

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JackP_oldaccount
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avatar image Jaatuli Jun 07 '16 at 10:37 AM

The content is quite big, but the blueprint is basically a crane that add/removes chain links when moving down/up.

alt text

Component settings are default except for selecting the link mesh and setting collision to nocollision.

If you can't replicate the the bug, I'll try to create a test project at some point when I have the time.

instancedmesh.png (266.8 kB)
avatar image Gareth Martin STAFF Jun 08 '16 at 01:36 PM

I have tried to reproduce this with a simple blueprint which adds an instance in its construction script, but it opened fine in 4.12.

Would you be able to upload a cut-down version of your 4.11 project we could reproduce it with?

avatar image Jaatuli Jun 10 '16 at 09:23 AM

Can you give me a email address? I need to give specific access, since the content is confidential.

avatar image Gareth Martin STAFF Jun 10 '16 at 09:33 AM

gareth dot martin at epicgames dot com

Please include a link to this thread in the email.

Thanks!

avatar image Jaatuli Jun 10 '16 at 09:52 AM

Hi, I sent you the link. I cannot add the link unless I force everyone to register to OneDrive with the email given.

Crash will occur when opening the BP_AutoCrane

avatar image Gareth Martin STAFF Jun 10 '16 at 10:15 AM

Thanks! I've received it and attached it to our internal bug report. I'll take a look at it as soon as I can.

It's so much easier to fix when I have a repro project :)

avatar image Gareth Martin STAFF Jun 10 '16 at 06:24 PM

Thanks very much I got a chance to look into it today and it should be fixed for 4.12.3!

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