I didn't understand that answer at all, but after poking around on the forums, I understand what this thing is. I didn't load it before coming to find out. If I'd just installed it with everything else and then loaded it into a scene, I'd have known what it's for. People use them to make the product page images for shaders and other things like that. Example: https://www.daz3d.com/mec4d-pbs-shaders-vol-2-for-iray
Comments
For rendering materials.
I didn't understand that answer at all, but after poking around on the forums, I understand what this thing is. I didn't load it before coming to find out. If I'd just installed it with everything else and then loaded it into a scene, I'd have known what it's for. People use them to make the product page images for shaders and other things like that. Example: https://www.daz3d.com/mec4d-pbs-shaders-vol-2-for-iray