Bizarre maps in Kingdom Hearts III

[robowil]

I'm trying to rip the Kingdom Key model from Kingdom Hearts III (PS4), and while I got the diffuse and normal maps properly extracted, there's also this weird map:



Is it supposed to be some sort of a special PBR map? It doesn't seem to have an AO channel, so I don't really know.

If anyone can figure out what it is, thank you in advance.

[Demonslayerx8]

the maps is for rendering certain shaders, sometimes used for detail masks.

use umodel to open the raw unreal engine files to understand the material concept.

[Makoto]

mask for mini bumps as the game uses shared mini bumps, this is a mask for what parts uses it

[robowil]

Interesting...

By the way, if I were to submit the model, should I split the map into seperate channels like I would with PBR maps?