Shadow Generations/Material Parameters
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Material parameters can allow you to change specific settings in the material itself.
PBRFactor: PBRFactor is a new parameter added for Shadow Generations to allow the material to not need a PRM map and has specific settings, this parameter only works on Common_d and Common_dn:
X - Specular, Y - Smoothness, Z - Metallic.
Luminance: Luminance allows you to edit the emission brightness without you needing to do it in the emission map itself
X - Brightness.