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Swapping landscape/foliage textures in a specific area??

Hi!

I’m making a level where as the player unlocks areas of the map, that area transitions from black/white to color to show that is has been unlocked. I want the player to be able to see a line on the ground merging black/white and color between areas that have been unlocked and locked.

The problem is I’m using landscape and foliage tools to make the whole map and since I want to be able to physically see where the unlocked area ends and locked area starts I don’t think post processing will do the trick. Is there a way to change textures in a specific area (landscape and foliage) to black/white then swap to color? I was thinking of maybe using masks to tell landscape where locked areas are but no idea how to implement it in the shader?

Any ideas???

Thanks!

there’s a desaturate node that you might be able to connect to a blueprint.

or something like this Local Desaturation - UE4 AnswerHub