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gltf: Helping to Make 3D Pervasive

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The Open Industry Standard

glTF Specification, Extensions & Roadmap

The glTF 2.0 Specification

• The glTF 2.0 Specification in PDF and HTML format
• glTF as an ISO/IEC 12113:2022 specification

glTF Extensions

glTF extensions provide a convenient mechanism to innovate and extend any part of the core glTF format. Ratified KHR extensions are widely adopted and may be included in future versions of the glTF core specification. The community is also free to propose and create new glTF extensions.

• Ratified glTF 2.0 KHR extensions
• Vendor and Multi-Vendor extensions
• Adding new features to glTF
• Creating glTF Extensions.

The Official glTF Roadmap

• Track the status of extensions and projects that are in development for a general sense of the priorities and direction of the glTF roadmap. Khronos Extensions Roadmap

Essential Resources for Using glTF

Key Resources

Thanks to the support of the Khronos membership and our passionate developer community, there is a full set of well-supported developer tools and resources to help quickly get you up and running with your glTF application development.

• The glTF Quick Reference Guide
• glTF Sample Assets - a curated collection of glTF assets that illustrate one or more features or capabilities
• glTF Sample Viewer - The official Khronos glTF Sample Viewer and GitHub Repository
• glTF Validator – validates assets against the glTF 2.0 specification and extensions. GitHub Repo
• glTF Asset Auditor – use as part of your asset validation pipeline. View GitHub Repo and Blog Post
• glTF Texture Compressor / Optimizer - optimize assets using texture and geometry compression methods. View GitHub Repo and Blog Post
• glTF Real-Time Asset Creation Guidelines – streamline the creation of 3D assets for 3D commerce and more ... GitHub Repo
• glTF Viewer App for iOS - easily display glTF 3D models. View App Store, GitHub Repo and Blog Post
• glTF on YouTube (the official Khronos glTF playlist of tutorials, presentations)
• Past Khronos glTF Webinars and Events
• For a list of additional glTF Projects, Libraries and Utilities view the Khronos glTF Ecosystem Explorer

THE ROUTE TO REALISM

Khronos PBR (Physically Based Rendering)

Khronos glTF PBR defines a set of parameters that are used within glTF to simulate real-world lighting interactions, materials, and surface properties. The combination of glTF’s efficient delivery and PBR’s realism has become a game-changer for the 3D industry, empowering artists and developers to deliver compelling and visually captivating experiences. A wide range of physical properties are supported, with detailed descriptions available in the core glTF 2.0 specification and accompanying material Extensions.

The Portable GPU Friendly Texture Format

KTX 2.0 - Delivering GPU Compressed Textures in glTF

KTX (Khronos Texture) is an efficient, lightweight container format supported by glTF for reliably distributing GPU textures to a diverse range of platforms to reduce asset file size and GPU memory usage. KTX adds the ability to specify textures using KTX v2 images with Basis Universal supercompression and is available in viewers and applications supporting the KHR_texture_basisu extension. The contents of a KTX file can range from a simple base-level 2D texture to a cubemap array texture with mipmaps. A wide range of open-source tools are available to help artists and developers create, convert, validate and transcode KTX compressed textures.