chub,
I think I can use your idea as my track is basically on a flat island with the main terrain being in a semi-circle at a good distance from the track. So I already have the underlying Google Earth image in BTB as a "map". My question then to your suggestion would be- how do I best create terrain out from the track as the terrain base in the distance is a good 1.5 to 3.5 miles away? If I fill terrain in from the track to to mountains isn't that going to kill my frame rate?
thanks.
kmikiw,
PM me and perhaps we can work out a solution together.