If you want a slightly raised path, just:- 1) Create your grassy terrain 2) Duplicate it 3) Change the mat on terrain 2 to stony (or whatever) 4) In the editor, erase (blacken) all areas that are NOT the path. 5) (optional, to reduce polys) clip terrain 2 6) Move terrain 2 a very very small amount upwards (use the numeric values)