Finally I find out the solution. In UE5.4.x we need to make a little change in /Engine/Source/Plugins/Runtime/HairStrands/Source/HairStrandsCore/Private/HairStrandsDatas.cpp, change this
to
then we could load groom hair data correctly from .pak file.
------------ div line --------------
I meet the same problem now. I paked a simple groom uproject at ue 5.4.3 with UseIoStore:Off in development mode, then I tried to open package, it came to here and crshed
In factI’ve tried to pak a simple groom scene at ue 5.5.1, and it worked correctly without any crash, but I’ve done a lot of works in my 5.4.3 projects and won’t change it to 5.5.1. So what’s the difference of groom pak IO between 5.4.x and 5.5.1? How should I change the source code so that my groom work at 5.4.3 could be used correctly?