I succed in the first step (3 ouput maps) in order to create an export preset for SP 2017 but I block on "For this to export correctly you also need to add Ambient Occlusion, Opacity and Glossiness (due to P3d using a Specular gloss instead of a Metallic roughness) to your texture set. ".
Do I have to add 3 different $mesh_$texture ... each with the appropriate information ?
Here my trial ...
View attachment 46952
A very good idea will be to export this preset and share this export preset, if some one has so time to spend ? or if you can give more informations about adding AO, Opacity and Glossiness in the export preset.
PS : https://support.allegorithmic.com/documentation/spdoc/creating-export-presets-98959398.html
You only need 3 output maps Albedo, Metallic, Normal.
The texture set is in the main program where you bake your maps
Under channels press the + and add Ambient Occlusion, Opacity and Glossiness, you will get errors on export if these aren't in your texture set.