Thank you! That part of the post processing volume was actually created by The Furryous Animal on the UE4 marketplace, I merely adapted it and combined it with one of my own volumes to achieve the effect (the depth of field in the photo is mostly for the screenshot, I still have a lot of tinkering to do with it.). That said, here’s a tutorial you can use to achieve the same outlining effect Tutorial – Creating outline effect around objects | Unreal Engine 4 blog
It is based on distance, the closer the object the more thick the outline will be (to a point). I agree its a bit distracting on the grass but I really like its effect on the trees and deer.