The data structures used for supporting spatial queries in FMeshSceneAdapter are somewhat complex. Externally, the user adds Actors/Components, which results in FActorAdapter objects, each with list of FActorChildMesh. Each FActorChildMesh is a /reference/ to a mesh, not a mesh itself, as well as a transform. This allows unique mesh data to be shared across many usages, eg similar to StaticMeshActor / ISMComponent / Asset. (However there is no required 1-1 correspondence between FActorChildMesh and an actual Component, and in the case of an InstancedStaticMeshComponent, there will be an FActorChildMesh for each Component)