This repository contains the reference PBR material implementation that shows how to implement a custom RenderMaterial built on top of the textured content field and GetParameter() API to ensure it works with Raytraced (v6) and in the 'near' future in v7 (also Rendered mode).
The Rhino.Render.PhysicallyBasedMaterial.ParameterNames class contains the names of the PBR parameters Rhino supports and understands. Any one wishing to create PBR materials should use these.
The reference material plug-in can be installed using _TestPackageManager.
The name of the packages is rhinopbrmaterial.
Note that Rhino 6.12 or newer is needed.