xeogl extended to load glTF models with PBR materials

Xeolabs developer Lindsay Kay this month extended xeogl to load glTF models with PBR materials, for both metallic/roughness and specular/glossiness work flows, using the FRAUNHOFER_materials_pbr extension. This is still a work in progress, as they are following along behind the current development of the glTF 2.0 spec. xeogl is a WebGL-based 3D engine that's geared towards visualization applications in science, technology, engineering and mathematics (STEM).