@Vassago that's nice little trick You've got there :) @Vig that's exactly what i've done. correct me if i'm wrong but this way makes the borders of a road go either over the terrain or below it, as only the base spline is tangent to the surface. Vassago's way deals with that as it creates a quatstrip that has vertices…
i've done a quick check and heres what i've found: when You draw splines on top of a terrain and then using sweep modifier(i don't know how else) create geometry the place where the road sticks to the terrain is in the middle(that's rather obvious), which causes the borders to be sometiems 'burried' in the ground. is there…