ReadonlynameStable identifier used for lookup, signature hashing, and pass-name keying.
When false, the feature is skipped each frame. Toggling triggers a cached-graph invalidation.
Live toggle: real catalog stars (true) vs the procedural field (false).
Only takes effect once the (async) catalog bake set via catalog is ready.
Procedural starfield as a render feature wrapping StarsPass. Reads
frame.hdr+frame.depth, adds stars on sky pixels (depth == 1), and writes the result back intoframe.hdr. Register AFTER the sky / lighting features (so the HDR + depth exist) and BEFORE bloom + tonemap (so bright stars bloom and get tonemapped with the rest of the scene).