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A unified GLTF/X3D extension to bring physically-based rendering to the web

We present a unified material description and transmission format for real-time, physically-based shading. Our format is general enough to be used consistently across multiple rendering systems and platforms, covering a wide range of applications from desktop to Web. Furthermore, our format's expressiveness allows to represent a wide variety of real-world materials. First, we define a common parameter set for physically-based shading in modern, real-time 3D graphics systems. We then demonstrate its applicability for several types of materials on different rendering systems. Finally, we propose a transmission format, in the form of extensions for the glTF and X3D standards.