nff
version 3.0

grass  // @ Y = 0.1 ***********************************************************
mtable cardemo.mat
4
-1000.0 0.1 -1000.0
 1000.0 0.1 -1000.0
 1000.0 0.1  1000.0
-1000.0 0.1  1000.0
1
4 0 1 2 3 matid 0 both

roads // @Y = 0.0  ************************************************************
mtable cardemo.mat
8
-1000.0 0.0   -10.0
 1000.0 0.0   -10.0
 1000.0 0.0    10.0
-1000.0 0.0    10.0
   10.0 0.0 -1000.0
   10.0 0.0  1000.0
  -10.0 0.0  1000.0
  -10.0 0.0 -1000.0  
2
4 0 1 2 3 matid 1 both
4 4 5 6 7 matid 1 both