It's crazy realizing that glTF 2.0 is already nine years old for this API-neutral 3D runtime and asset delivery format. The Khronos 3D Formats Working Group today extended that with the debut of glTF 2.1 as a backward-compatible revision to the specification.

While up to now glTF was basically focused on shipping single assets, glTF 2.1 makes the format more applicable for large, composed scenes as the main focus of the v2.1 release.

Among the additions to glTF 2.1 are allowing preview thumbnails to be embedded directly within glTF files that can be presented without needing a renderer, a standardized way for composing and delivering multi-file scene graphs, new spatial primitives, progressive delivery work, and a 64-bit GLB format to lift the 4GB size ceiling.

Those wishing to learn more about today's glTF 2.1 spec release can do so via Khronos.org.