Hello, I really love the shader, thank you so much for sharing!
But I have a problem with applying it to my landscape. 
happens when I do it: Screenshot - 7d7731a708edf048014d76dde88e268b - Gyazo
I copy pasted what jonimake posted, and connected everything, and then applied it to my landscape.
Any ideas? 
EDIT: is my landscape with my other material (without the POM shader): Screenshot - 66119723c3261b96276608286c1ed2d4 - Gyazo
EDIT2: Fixed it, it was the silhouette. I turned it off and now it’s fine.