Quote: "Couldn't you just make a bumpy 3d model and import it? Then you'd have hills. "
To expand on that - is the collision system good enough to allow someone to walk over a small bumpy "hill" placed on ground level?
I'm thinking sand dunes, low walls you can jump over, foxholes, trenches, etc.
Actually can you do *anything* to the ground at all to roughen it up - I once saw a tutorial by someone who worked on Quake 2 which showed how they divided the ground into polygons (triangles) and raised/lowered vertices until the ground had an uneven appearance - looked terrible as a wire frame, but when textured it created an acceptable illusion.