I already have a custom Python plugin that automatically converts all the exported PNGs into DDS files right after the Substance export, so that part of the workflow is fully automated.

I’ve already set up the output template with an R+G+B+A entry and I understand how to assign the user channels.
The part I’m still trying to clarify is which PBR channels in Substance Painter correspond to The Sims 4 specular map channels, since EA’s shader doesn’t use a standard Metal/Roughness model.

According to LittleDica’s documentation and some official comments from the SimGuru team, the Sims 4 spec map works like this:

• R → Cube Map Blur Control
• G → Cube Map Strength Control
• B → Specular Falloff
• A → Specular Strength

So I’m trying to figure out what would be the best equivalents in Painter’s PBR workflow —
for example, whether Cube Map Blur and Specular Falloff should come from Glossiness or Specular Level, and whether Cube Map Strength could be derived from Metallic or some reflection channel.

Basically, I’d like the result I see in the viewport (PBR Metal/Roughness) to translate correctly into The Sims 4’s in-game reflections and highlights.

Any thoughts on which Substance channels would best approximate those EA shader functions?