GLB Format GLB is the binary representation of 3D models and stores information about 3D models such as node hierarchy, cameras, materials, animations, and meshes. GLB is a container format and was introduced for the representation of glTF assets in a binary blob to avoid the issues caused by glTF. Furthermore, the GLB file is globally acceptable by AGI Systems Tool Kit (STK), a program used to simulate aerospace missions, defense systems, and telecommunication systems.