- Mini JSON parser (no external deps) for glTF support - GLB binary format: header, JSON chunk, BIN chunk - Embedded base64 buffer URI support - Accessor/BufferView extraction (position, normal, uv, tangent, indices) - PBR material extraction (baseColor, metallic, roughness) - Auto compute_tangents when not provided Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>