Expensive half of Points node loading: derive the view state, fetch
the points via the loader, and commit geometry into the placeholder
(found by name). Safe to call after initial scene load returns (lazy
lod_group levels) — it checks isDatasetLive() before committing so a
deferred load still in flight when the user switches datasets never
writes into a disposed/replaced scene.
Expensive half of Points node loading: derive the view state, fetch the points via the loader, and commit geometry into the placeholder (found by name). Safe to call after initial scene load returns (lazy lod_group levels) — it checks
isDatasetLive()before committing so a deferred load still in flight when the user switches datasets never writes into a disposed/replaced scene.