I'm using Blender and UE4, and I've got a problem: For most materials I use several textures (Color, Roughness, Metalic, etc.) I recently discovered painting with Blender and I love it, but I would like to know how can I paint several layers at once. For example, I might have a mesh with a Color and a Roughness layer, and when I add rust to it, I want the Roughness layer to also be affected. Any ideas?



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