HairStrandCore crashes UE5.3.2 ( too many Crashes)

Development Character & Animation
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1

Hello and sorry for my User name :slight_smile: …my son is using my accont to play Fortnite… :smiley:

i’m working with UE5.3.2 and I’ve an animated Alembic Cache which has a groom binded to it.
Everything works fine in the editor and in the sequence managare, but Unreal carshes A LOT when i render the scene (not always though, and it happens whether i’m using MRQ or the legacy render).
It also crashes a lot when i save the Map.
The code errros are various and this is ones of the more recurring ones:
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000001000000120
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION 0xffffffffffffffff )

UnrealEditor_HairStrandsCore
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_LevelSequence
UnrealEditor_LevelSequence
UnrealEditor_MovieScene
UnrealEditor_MovieScene
UnrealEditor_MovieScene
UnrealEditor_MovieScene
UnrealEditor_MovieScene
UnrealEditor_MovieScene
UnrealEditor_MovieScene
UnrealEditor_MovieScene
UnrealEditor_MovieScene
UnrealEditor_MovieScene
UnrealEditor_LevelSequence
UnrealEditor_MovieScene
UnrealEditor_MovieScene
UnrealEditor_MovieScene
UnrealEditor_MovieRenderPipelineCore
UnrealEditor_MovieRenderPipelineCore
UnrealEditor_MovieRenderPipelineCore
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
UnrealEditor
kernel32
ntdll

I’m using an RTX3090. The map is the Valley of the Ancient and i’m using it as a Location for an animated sort-film.
Any help would be much much aprpeciated cause i’m having at least 50-100 crashes per day.

Thanks in advance!

Alvise

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I’m having the exact same crash of:
UnrealEditor_HairStrandsCore
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_Engine
kernel32
ntdll
I’m using 5.5 with the new optimized Metahumans set at “high” quality. It’s very random and difficult to replicate, but deeply concerning nonetheless. I created a brand new blank project only porting over my metahuman and this crash still happens occasionally. My drivers are up-to-date, restarted my PC, etc… Very bizarre bug, I’m on a 4090 in a fresh new project.
If anyone has any insight into this crash I’d greatly appreciate it!

1 Like
3

I have the same issues in UE5.5.

1 Like
4

I am also having the same issue in 5.5. I rendered the same scene yesterday and it did not crash. I’m struggling to troubleshoot the cause.

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Hello guys - if anyone stumbles upon this, and there is stil lnot yet a fix for it, I have two workarounds that worked for me:

  1. So the first is, just simply uncheck “Enable Simulation” on the Groom asset under Simulation->Simulation Settings->Solver Settings. This of course does what it actually says: disables the simulation.
    So, my second workaround is exactly helps on this:

  2. I figured out (well, at least in my project) if the Groom Simulation is disabled, BUT by Blueperint I re-enable with a bit of delay on BeginPlay event, it works for me. For that, I only call the Delay node with just a 0.2 seconds of delay, before calling on the Groom asset the “Set Enable Simulation” with of cousre “In Enable Simulation” checked on the node.

I hope it can be of use for anyone who stumbles upon this issue as well! Also if there is already a real solution, please let me know, cheers and thanks in advance! :slight_smile: