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It seems like these textures are needed to create dirt, but how do I do this and why do the textures look like this? example image 1 showing texture in question

example image 2 showing texture in question

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The red, green and yellow colors indicate that this is a UV texture from Unreal Engine 4. You might be able to bake the mask into a PBR texture in UE4, or use a separate RGB node in blender to use this dirt mask texture.

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