leaving trail of paint when moving around, how do i find out how much of the map is covered in paint

Basically the title, I want to create a game, where I have monochrome map, and I leave behind me a trail of paint, it is against an opponent, both are trying to get as much of the map covered in their color, while ofc overlaying the paint of the opponent, how do i find out and display how much map have they covered, and how much remains?

try this asset.

Will do, thanks :slight_smile:

or maybe this one :

and also this one

or