ReadonlyregisteredReadonlyownedReadonlystaticMaterials tracked for disposal that take NO camera broadcast.
The generic destination for anything register() finds without an
updateCameraParams: counted in the stats snapshot, but never iterated by the
camera broadcast — which is the point, since that loop calls
updateCameraParams on every member. All four geometry types are camera-aware
today (mesh joined them with the near fade, #1431), so the set is normally
empty. Disposal is NOT what it is for — register() adds the same material to
ownedMaterials, which the manager's teardown covers — so this must be cleared
alongside the others purely to keep the stats count honest.
Readonlysubscribed
Registry references the lifecycle helpers operate on. Supplied by the
MaterialManagerorchestrator as it owns the actualSetinstances; the helpers never mutate state that isn't reachable through this context.