There was a nice recent paper in JCGT that dealt with using noise to model terrain. It does a nice job of creating gently rolling hills. Modeling Real-World T

There was a nice recent paper in JCGT that dealt with using noise to model terrain. It does a nice job of creating gently rolling hills. Modeling Real-World Terrain with Exponentially Distributed Noise (http://jcgt.org/published/0004/02/01/ http://jcgt.org/published/0004/02/01/)