void USceneComponent::SetVisibility(const bool bNewVisibility, const USceneComponent::EVisibilityPropagation PropagateToChildren)
{bool bRecurseChildren = (PropagateToChildren == EVisibilityPropagation::Propagate);if ( bNewVisibility != GetVisibleFlag() ){bRecurseChildren = bRecurseChildren || (PropagateToChildren == EVisibilityPropagation::DirtyOnly);SetVisibleFlag(bNewVisibility);OnVisibilityChanged();}const TArray<USceneComponent*>& AttachedChildren = GetAttachChildren();if (bRecurseChildren && AttachedChildren.Num() > 0){// fully traverse down the attachment tree// we do it entirely inline here instead of recursing in case a primitivecomponent is a child of a non-primitivecomponentTInlineComponentArray<USceneComponent*, NumInlinedActorComponents> ComponentStack;// prime the pumpComponentStack.Append(AttachedChildren);while (ComponentStack.Num() > 0){USceneComponent* const CurrentComp = ComponentStack.Pop(/*bAllowShrinking=*/ false);if (CurrentComp){ComponentStack.Append(CurrentComp->GetAttachChildren());if (PropagateToChildren == EVisibilityPropagation::Propagate){CurrentComp->SetVisibility(bNewVisibility, EVisibilityPropagation::NoPropagation);}// Render state must be dirtied if any parent component's visibility has changed. Since we can't easily track whether // any parent in the hierarchy was dirtied, we have to mark dirty always.CurrentComp->MarkRenderStateDirty();}}}
}

void USceneComponent::SetHiddenInGame(const bool bNewHiddenGame, const USceneComponent::EVisibilityPropagation PropagateToChildren)
{bool bRecurseChildren = (PropagateToChildren == EVisibilityPropagation::Propagate);if ( bNewHiddenGame != bHiddenInGame ){bRecurseChildren = bRecurseChildren || (PropagateToChildren == EVisibilityPropagation::DirtyOnly);bHiddenInGame = bNewHiddenGame;OnHiddenInGameChanged();}const TArray<USceneComponent*>& AttachedChildren = GetAttachChildren();if (bRecurseChildren && AttachedChildren.Num() > 0){// fully traverse down the attachment tree// we do it entirely inline here instead of recursing in case a primitivecomponent is a child of a non-primitivecomponentTInlineComponentArray<USceneComponent*, NumInlinedActorComponents> ComponentStack;// prime the pumpComponentStack.Append(AttachedChildren);while (ComponentStack.Num() > 0){USceneComponent* const CurrentComp = ComponentStack.Pop(/*bAllowShrinking=*/ false);if (CurrentComp){ComponentStack.Append(CurrentComp->GetAttachChildren());if (PropagateToChildren == EVisibilityPropagation::Propagate){CurrentComp->SetHiddenInGame(bNewHiddenGame, EVisibilityPropagation::NoPropagation);}// Render state must be dirtied if any parent component's visibility has changed. Since we can't easily track whether // any parent in the hierarchy was dirtied, we have to mark dirty always.CurrentComp->MarkRenderStateDirty();}}}
}