simple polygon based terrains for iphone

Hi - I just want to set up a simple world for my game which involves some moderate sloped terrain. Polygon based terrain would be ideal - I’ve seen the terrain plugin and various other solutions and they are very complex. I just need to know a simple way to add things like ramps, slopes, etc. Does anybody know of a resource that would get me started in building something like that?

Create a terrain in Unity and then export it as an .obj file using TerrainObjExporter.