Exclusion mask

[inugames]

Hi, I'm following the "stone wall "example on sketchfab, there are 2 steps

-Original model with shadow markup
-Original model with exclusion mask to prevent dark regions from being classified as shadow

I don't understand how can I make the exclusion mask without shadows and light marks? Is that a separate mask? I tried to paint extra color marks together with the light/shadow mask , but it doesn't seems to work, Could you explain those steps more in detail please?

https://sketchfab.com/3d-models/stone-wall-de-lighter-d08a5de8538c4852935667907e20d82a

[inugames]

Sorry, I didn't read the docs attentively, it's a new Shadow scale map.