I"m not sure if it's been mentioned somwhere already, but can you guys define what substances are currently included in the mention of “new, smaller, very focused collection of base materials which are PBR ready”? Do these include standard materials such as different metal types (steel, titanium, aluminum, iron, brass, etc), possibly baseline woods, plastics, plasters, glass, concrete, etc.? The PBR database could be a huge deal considering how much time and effort goes into authoring real-world accurate PBR materials, have a good baseline to construct other Substances with would be worth it's weight in gold.