Unreal Engine Livestream - Post Processing in UE4: Cel-Shading - Jan 4 - Live from Epic HQ

https://imgur.com/a/SwpX4Kc

Depth lines are showing up on the skybox. Tried but giving me an error. How to fix it?

I am new to unreal, if you plug in a “IF” node, what will plug in “B” and “A<B”/“B<A”???