ReadonlyrendererReadonlysceneReadonlycameraReadonlyhdrReadonlyldrReadonlymegaReadonlymegaReadonlybloomReadonlyfxaaReadonlyrefractionThe scene-pass split for refract_data glass (spec §3.4 Phase 3), both backends;
null only once disposed. See renderSceneToHdr.
Read-only references the pipeline runner needs from the orchestrator.