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Treat every glTF as a versioned production contract: coordinate and naming rules, slot-aware KTX2, tier budgets, CI validation, immutable delivery, race-safe loading and provenance.
A 3.7 MB helmet is brutal on mobile. Compress geometry with Draco/Meshopt, textures with KTX2, and clean structure with gltf-transform — often 5–10× smaller, no visible loss. Commands, decision tables, the loader hookup and the traps.
Stop building everything from primitives. Model in Blender, export glTF/GLB, and load it with GLTFLoader. Export settings, scene-graph mapping, scale, units, PBR materials, and the pitfalls that bite — with a live model loader.