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API > API/Runtime > API/Runtime/Chaos > API/Runtime/Chaos/GeometryCollection > API/Runtime/Chaos/GeometryCollection/Facades > API/Runtime/Chaos/GeometryCollection/Facades/FCollectionHierarchyFacade
References
| Module | Chaos |
| Header | /Engine/Source/Runtime/Experimental/Chaos/Public/GeometryCollection/Facades/CollectionHierarchyFacade.h |
| Include | #include "GeometryCollection/Facades/CollectionHierarchyFacade.h" |
| Source | /Engine/Source/Runtime/Experimental/Chaos/Private/GeometryCollection/Facades/CollectionHierarchyFacade.cpp |
int32 GetRootIndex&40;&41; const
Remarks
Get the root index