The materials for the Window Arcimesh (Using the Archimesh add-on) were all black. I entered the Node Editor to check it out, and found this material organization.
I'm unfamiliar with what is trying to be accomplished here, as these nodes imported with the add-on. What are they trying to accomplish here? Is the node format outdated? What was trying to be accomplished?
And... How would I go about restoring the previous settings? If I can't, how would I go about redefining these textures to look at least similar to what was intended?
(Apologies if these are too many questions; I'm looking to learn).