NiagaraDataInterfacePhysicsAsset.h and GroomComponent.h in Unreal 5.1 - header not found

Development Programming & Scripting C++
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According to Unreal Engine 5.1 release notes:

Disabled dependency on the HairStrands plugin for Niagara Fluids. Old assets may now fail to run properly without manually enabling the HairStrands plugin for access to the NiagaraDataInterfacePhysicsAsset class.

I’m using the HairStrands plugin and after migrating to Unreal 5.1 from 5.0, my project fails to compile. I’m getting a message that the header NiagaraDataInterfacePhysicsAsset.h, included in the file GroomComponent.h in the HairStrands plugin, was not found.
I could find that exact file in Plugins/FX/Niagara/Source/Niagara/Classes. What should I do to be able to run my project? Everything I’ve tried so far has failed and there is no info on the internet other than the release note. What does “Manually enabling the HairStrands plugin for access (…)” mean? What can I do?

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2

I am also experiencing this same problem.
@TomaszKalisiak

add “Niagara” to your “PublicDependencyModuleNames” in your Projectname.Build.cs file

Example : PublicDependencyModuleNames.AddRange(new string[] { “Core”, “CoreUObject”, “Engine”, “InputCore”,“Niagara” });

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Thank you, it helped!

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I’ve got the same problem, but with a plugin, any idea on how I would go about fixing it?

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Thank you so much!!!

6

Thank you so much !!! This problem waste lots of my time !

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Now getting this error?

Unreal Engine\UE_5.2\Engine\Plugins\Runtime\HairStrands\Source\HairStrandsCore\Public\GroomComponent.h(24): error C2143: syntax error: missing ‘;’ before ‘’

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I’ve got the same problem, but with a plugin, any idea on how I would go about fixing it?

9

Thank you! It helped!

10

More details if you’re having problem?
This may occur if this is something like:

#include “GroomComponent.h;”
Delete - ‘;’ - this thing.

#include “GroomComponent.h”
Careful about simple syntaxes.

Edit:
wait your error is telling to you:

#include ;“GroomComponent.h”
Something like this. To be clear, more details required.

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I’ve found a way. it is because in the folder of HairStrands in Unreal Engine folder. In my case, it is 5.3

UE_5.3\Engine\Plugins\Runtime\HairStrands\Source\HairStrandsCore\Public
UE_5.3\Engine\Plugins\Runtime\HairStrands\Source\HairStrandsCore\Private\

There will be no NiagaraDataInterfacePhysicsAsset.h as well as NiagaraDataInterfacePhysicsAsset.cpp

If you have UE 4 (in my case, it is 4.27) and go to same location copy from there and paste in same locations

UE_5.3\Engine\Plugins\Runtime\HairStrands\Source\HairStrandsCore\Public\NiagaraDataInterfacePhysicsAsset.h
UE_5.3\Engine\Plugins\Runtime\HairStrands\Source\HairStrandsCore\Private\NiagaraDataInterfacePhysicsAsset.cpp