glTF

This file format name comes from Graphics Language Transmission Format. It is a standard file format for 3D scenes and models. A glTF file uses one of two possible file extensions: .gltf (JSON/ASCII) or .glb (binary). Both .gltf and .glb files can reference external binary and texture resources. Alternatively, both formats may be self-contained by directly embedding binary data buffers (as base64-encoded strings in .gltf files or as raw byte arrays in .glb files). This is an open standard developed and maintained by the Khronos Group, and it supports 3D model geometry, appearance, scene graph hierarchy, and animation.