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Entities Horizon's entity culling hides from the camera keep their vertices in a hidden span that only the pack's shadow pass draws; the local player's model is built in first person, hidden from the camera, while the pack casts entity shadows. shadowPlayer draws the player alone when shadowEntities is off, shadowLightBlockEntities the light-emitting block entities when shadowBlockEntities is off. Without a shader pack nothing changes. Clean-room: implemented from cleanroom/shader-packs-spec.md revision 1, §2.4, §3.2; no other loader's code read. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>