Khronos glTF PBR defines a standard set of parameters that are used to simulate real-world lighting interactions, materials, and surface properties. 3D artists and developers can use PBR to create stunning, lifelike environments that accurately respond to lighting conditions, reflections, and shadows. The combination of glTF’s efficient delivery and PBR’s realism has become a game-changer for the 3D industry, empowering content creators to deliver compelling and visually captivating experiences to their audiences.
Link: https://www.khronos.org/gltf/pbr/