Hi Forum!
Hope you are all well. I am trying to understand how I use the new Physical textures. I use Pixplant 5 to extract all my info which outputs base colour, metalness, roughness, displacement, normal and ao. As there is no specular anymore, do I use the metalness for specular? Should I use metalness for wood? Is there a good C4D Corona tutorial on PBR workflow? Many thanks and have a good weekend all 
John
There is Specular, it’s an option you can pick per material in place of IOR (see the Advanced tab of the material).
(PS - this is of course not a fake Specular Highlight value, but instead a mapping that controls the intensity of reflection, as a specular highlight is in fact a reflection; same as IOR controls the intensity of the reflection; so you just use whichever one matches the maps you have. You would never use metalness except for metals, so not at all on wood 
)
Many thanks Tom!
Getting there… Have read a couple of threads on PBR and starting to get the hang of it John
Not even for the wood of the silver birch?
Running away and laughing madly
Run faster, in case they catch you! lol