I was messing around in Gridmap when suddenly I found this BEAUTIFUL structure It's a cave. A cave! I love this place! How did this happen? How can I make one? Do I need L3DT? I've been wanting to make an underground complex for ages and it looks like I can! I would like a technical explanation of how this was made.
The cave is a 3D model, several polygons are delete from the maps surface and the tunnel is stuck where the hole is. Your effectively just driving under the map.