I am scripting in c# for unity 2017.3 and I am unable to find anywhere either how to make a terrain under the world invisible (if I could do that I could simply tag it as lethal or whatnot) or alternatively I am hoping for some way to say “if(Position<-3){…}”
Just to be clear, are you looking to figure out a way to kill your player if they someone leave the terrain and fall too far?