OptionallodStates: ReadonlyMap<string, LODProgressState>OptionaladditiveTotal: number
total additive layers in the tree (see countAdditiveNodes). The live count only covers layers with a streaming loader attached (typically just the active substitutive level); showing "live/total" keeps the summary consistent with the number of additive chips visible in the tree.
One-line summary of LOD/partition activity for the scene-graph header, e.g. "2 substitutive · 1/5 additive active · refining 1". Returns
''when no LOD/partition state is present.