Thanks for the reply. So, if I understand correctly, using the fresnel node is actually not necessary? Is it safe to say that, for basic PBR compliant materials, all you need is to supply a base color, roughness map, normal map, and whether it is metal or not?
Also, since my test map is just a gray sphere, instead of reflection probes I have an ambient cubemap applied via post processing. Would it be better to ditch the ambient cubemap and build a simple hallway so probes can have something to reflect?
Thanks again.