Hi,
Sorry for the late reply. Indeed, good catch, this is the first time I see a report of that issue.
Could you try the following code on your side? Base on the repro steps I managed to repro the issue on my side, and the code below fix the issue.
`if (LocalBindingAsset && GHairStrands_GroomBindingValidationOnComponent > 0)
{
// Ensure the groom binding asset’s resources match the groom asset’s resources.
// They can mismatch when the groom asset has been edited and the groom binding hasn’t been updated/finished to be built yet.
const uint32 NumGroup = LocalBindingAsset->GetHairGroupResources().Num();
check(NumGroup == GroomAsset->GetHairGroupsResources().Num());
for (uint32 GroupIt = 0; GroupIt < NumGroup; ++GroupIt)
{
const UGroomBindingAsset::FHairGroupResource& BindingResource = LocalBindingAsset->GetHairGroupResources()[GroupIt];
const FHairGroupResources& GroomResources = GroomAsset->GetHairGroupsResources()[GroupIt];
const bool bHasGuides = GroomAsset->NeedsInterpolationData(GroupIt);
const bool bHasStrands = GroomAsset->HasGeometryType(GroupIt, EGroomGeometryType::Strands);
const bool bHasCards = GroomAsset->HasGeometryType(GroupIt, EGroomGeometryType::Cards);
bool bValid = true;
// Check guides
if (GroomResources.Guides.IsValid() && bHasGuides)
{
bValid = bValid && BindingResource.SimRootResources && BindingResource.SimRootResources->GetLODCount() > 0;
}
// Check strands
if (bValid && GroomResources.Strands.IsValid() && bHasStrands)
{
bValid = bValid && BindingResource.RenRootResources && BindingResource.RenRootResources->GetLODCount() > 0;
}
// Check cards
if (bValid && GroomResources.Cards.LODs.Num() > 0 && bHasCards)
{
bValid = bValid && GroomResources.Cards.LODs.Num() == BindingResource.CardsRootResources.Num();
if (bValid)
{
for (uint32 CardIt = 0, CardCount = GroomResources.Cards.LODs.Num(); CardIt < CardCount; ++CardIt)
{
if (GroomResources.Cards.LODs[CardIt].IsValid())
{
bValid = bValid && BindingResource.CardsRootResources[CardIt] && BindingResource.CardsRootResources[CardIt]->GetLODCount() > 0;
}
}
}
}
if (!bValid)
{
LocalBindingAsset = nullptr;
break;
}
}
}`Thank you!
/Charles.