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Hello I need some little advice to create a pbr material weathering effect. In Substance Designer there is a effect that is called ground dirt. What it does is realy simple, it makes an object dirty from bottom to top, and gets smoothed and loose opacity at the top. Like this, please ignore the colors, i know they are ugly. Now i have tried to rebuild this weathering effect with the new material editor, but i cant get it to work. My result This is the closest i could reach. Another shot with a different object. The main problem is the calculation more on bottom. Take a look into the Cube Picture from 3d coat. It looks like it calculates every face that is placed in XZ direction and then caluclates upwards in Y. You see it in the small cubes on the side. The inner upper part have dirt, but on the lower part it is clean. Or take a look into the monster picture. The feet are dirty, but not at the top, and then the body gets dirty again. It looks like the more on bottom option dont calculate the complede object, it calculates more the XZ faces and then it move the material up. It is nice for leaks but not for my dirt effect. Did anybody have an idea how i could create a ground dirt effect like that in substance designer or painter? Cheers Malo