Been messing around with Hammer Editor for some time now and I've learned quite a few things, the map is shaping up well, Here's a glimpse at the curent layout:
Early layout But now I've run into a (probably) small problem, I can't figure out how to do outdoor environments (Like cliffs, mountains ... etc) like the ones seen in the Surface Tension and the beginning of Residue Processing, I've already searched around and came across something called Displacement but it seems like it's only for Source games, so my Question is: How does one create Mountains or cliffs like those for GoldSrc games? what is the right way to do it? Thanks.