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Which one is Roughness Map?

Hi!

Im currently trying out making a landscape in UE4. I have modeled and textured with Color and Normal. But the textures looks horrible and I need Roughness Map, but I have NO idea which one that is. I have downloaded different textures of rock, and it had the Color, the Normal, Render, SPES,DISP.

How do I know which one of the other is a Roughness Map? And do you have any tips for getting rock textures with normal and roughness for free?

:slight_smile: